ISOLATED NUCLEIC ACID MOLLECLE, CHEMICAL POLYPEPTIDE, PLANT EXPRESSION VECTOR, METHOD FOR PRODUCTION

专利摘要:
isolated nucleic acid molecule, chimeric polypeptide, plant expression vector, method for producing and using a transgenic plant material. The present invention relates to compositions and methods for targeting peptides, polypeptides and proteins to plastid-containing cell plastids. In some embodiments, the invention relates to chloroplastide transit peptides which can target a polypeptide to a plastid, and nucleic acid molecules encoding them. In some embodiments, the invention relates to methods for producing a transgenic plant material (e.g., a transgenic plant) comprising a chloroplast transit peptide, as well as plant materials produced by such methods, and plant consumer products made from them.
公开号:BR102013002598A2
申请号:R102013002598-4
申请日:2013-02-01
公开日:2019-03-06
发明作者:Justin M. Lira；Robert Cicchillo；Carla N. Yerkes；Andrew E. Robinson
申请人:Dow Agrosciences Llc；
IPC主号:

专利说明:

Descriptive Report of the Invention Patent for ISOLATED NUCLEIC ACID MOLECULE, CHEMICAL POLYPEPTIDE, PLANT EXPRESSION VECTOR, METHOD FOR THE PRODUCTION OF A TRANSGENIC PLANT MATERIAL AND USE OF THE SAME.
CROSS REFERENCE TO RELATED ORDERS
This application claims the benefit of US Provisional Patent Application Serial No. 61 / 593,555 filed on February 1, 2012 and also US Provisional Patent Application Serial No. 61 / 625,222 filed on April 17, 2012, the each report is incorporated here in its entirety as a reference.
DECLARATION OF AGREEMENT WITH 37 C.F.R. § 1.821 (c) or (e) - SEQUENCE LISTING PRESENTED AS ASCII TEXT FILE
According to 37 C.F.R. § 1,821 (c) or (e), a file containing an ASCII text version of the Sequence Listing has been filed with this application, the contents of which are incorporated herein by way of reference. TECHNICAL FIELD
The present invention relates to compositions and methods for genetically encoding and expressing polypeptides that are directed to plastids of plastid-containing cells. In certain embodiments, the invention relates to amino acid sequences that direct polypeptides to chloroplasts (for example, from higher plants) and / or nucleic acid molecules responsible for their encoding. In certain embodiments, the invention relates to chimeric polypeptides comprising an amino acid sequence that controls the transit of polypeptides to plastids and / or nucleic acid molecules responsible for their encoding.
BACKGROUND
Plant cells contain distinct subcellular organelles, commonly referred to as plastids, which are bounded by characteristic membrane systems and perform specialized functions within the cell. Particular plastids are responsible for photosynthesis, as well as the synthesis and storage of certain chemical compounds. All plastids are derived from proplastids that are present in the plant's themed meris2 / 161 regions. Proplastids can develop in, for example: chloroplasts, ethioplasts, chromoplasts, gerontoplasts, leukoplasts, amyloplasts, elaioplasts and proteinoplasts. Plastids exist in a semi-autonomous manner within the cell, containing their own genetic system and protein synthesis machinery, but relying on close cooperation with the nucleus-cytoplasmic system in their development and biosynthetic activities.
In photosynthetic leaf cells of higher plants, the plastids that attract the most attention are chloroplasts. The most essential function of chloroplasts is the performance of reactions directed by photosynthetic light. But chloroplasts also perform many other biosynthetic processes of importance to the plant cell. For example, all plant fatty acids are made by enzymes located in the chloroplast stroma, using ATP, NAOPH and readily available carbohydrates. In addition, the power of reducing electrons activated by light directs the reduction of nitrile (NO ₂ ') in ammonia (NH ₃ ) in the chloroplast; this ammonia provides the plant with nitrogen required for the synthesis of amino acids and nucleotides.
Chloroplast also takes part in the process of particular importance in the agrochemical industry. For example, it is known that many herbicides act by blocking functions that are carried out within the chloroplast. Recent studies have identified the specific target of several herbicides. For example, triazine-derived herbicides inhibit photosynthesis by displacing a plastoquinone molecule from its binding site on the 32 kD polypeptide of photosystem II. This 32 kD polypeptide is encoded in the chloroplast genome and synthesized by organelle machinery. Mutant plants were obtained, which are resistant to triazine herbicides. These plants contain a 32 kD mutant polypeptide from which plastoquinone can no longer be displaced by triazine herbicides. Sulphonylureas inhibit acetolactate synthase in the chloroplast. Acetolactate synthase is involved in isoleucine and valine synthesis. Glyphosate inhibits the function of 5-enol pyruvyl-3-phosphochiquime synthase (EPSPS), w3 / 161 which is an enzyme involved in the synthesis of aromatic amino acids. All of these enzymes are encoded by the nuclear genome, but they are transported to the chloroplast where the actual amino acid synthesis takes place.
Most of the chloroplast proteins are encoded in the nucleus of the plant cell, synthesized as larger precursor proteins in the cytosol and post-translationally imported into the chloroplast. Importation through the outer and inner envelope membranes for the stroma is the main means for the entry of proteins destined for the stroma, the thylacoid membrane and the lumen of the thylacoid. Localization of precursor proteins imported into the thylakoid membrane and the lumen of the thylakoid is accomplished by four distinct mechanisms, including two that are homologous to bacterial protein transport systems. In this way, mechanisms for protein localization in the chloroplast are, in part, derived from the prokaryotic endosibion. Cline and Henry (1996) Annu. Rev. Cell. Dev. Biol. 12: 1-26.
Precursor proteins intended for chloroplast expression contain N-terminal extensions known as chloroplast transit peptides (CTPs) (Chloroplast Transit Peptides). The transit peptide is instrumental for specific recognition of the chloroplast surface and in the mediation of post-translational transport of pre-protein through the chloroplast envelope and then to the various sub-compartments within the chloroplast (for example, stroma, thylakoid and membrane of the thylacoid). These N-terminal transit peptide sequences contain all the information needed to import the chloroplast protein into plastids; transit peptide sequences are necessary and sufficient for plastid import.
Plant genes reported to have transit peptide sequences naturally encoded at their N-terminus include the small subunit of ribulose-1,5-bisphosphate carboxylase chloroplast (RuBisCo) (de Castro Silva-Filho et al. (1996), Plant. Mol. Biol. 30: 769-80; Schnell et al (1991), J. Biol. Chem. 266: 3335-42); EPSPS (see, for example, Archer et al. (1990) J. Bioenerg. And Biomed. 22: 789-810 and United States Patents
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States 6,867,293, 7,045,684 and Re. 36,449); tryptophan synthase (Zhao et al (1995), J. Biol. Chem. 270: 6081-7); plastocyanin (Lawrence et al (1997), J. Biol. Chem. 272: 20357-63); chorismato synthase (Schmidt et al (1993), J. Biol. Chem. 268: 27447-57); the Light Harvesting Chlorophyll a / b Binding Protein a / b binding protein (LHBP) (Lamppa et al. (1988), J. Biol. Chem. 263: 14996-14999); and Arabidopsis thaliana chloroplast protein (Lee et al. (2008), Plant Cell 20: 1603-22). United States Patent Publication No. US 2010/0071090 provides certain chloroplast targeting peptides from Chlamydomonas sp.
However, the structural needs for information encoded by chloroplast targeting peptides remain elusive, due to their high level of sequence diversity and lack of common sequence motifs or consensus, although there may be distinct subgroups of targeting peptides to chloroplast with independent structural motifs. Lee et al. (2008), supra. Still, not all of these sequences were useful in heterologous expression of chloroplast-directed proteins in higher plants.
BRIEF SUMMARY OF THE INVENTION
Compositions and methods are described here for targeting polypeptide plastids in a plant. In some embodiments, a composition comprises a nucleic acid molecule comprising at least one nucleotide sequence encoding a synthetic Brassica-derived chloroplast transit peptide (e.g., TraP8 peptide and a TraP9 peptide) operably linked to a nucleotide sequence of interest . In particular embodiments, such nucleic acid molecules may be useful for expressing and targeting a polypeptide encoded by the nucleotide sequence of interest in a monocot or dicot plant. Also described are vectors comprising a nucleic acid molecule comprising at least one nucleotide sequence encoding a synthetic Brassica-derived chloroplast transit peptide operably linked to a nucleotide sequence of interest.
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In some embodiments, a nucleotide sequence encoding a synthetic Brassica-derived CTP may be a nucleotide sequence that is derived from a reference nucleotide sequence obtained from a Brassica sp gene. (for example, B. napus, B. rapa, B. Juncea and B. carinata) or a functional variant thereof. In some embodiments, a nucleotide sequence encoding a synthetic Brassica-derived CTP may be a chimeric nucleotide sequence comprising a nucleotide sequence encoding partial CTP of a Brassica sp gene. or a functional variant of it. In specific embodiments, a nucleotide sequence encoding a synthetic Brassica-derived CTP may contain contiguous nucleotide sequences obtained from each of a Brassica sp. reference and a CTP of a gene other than Brassica sp., a Brassica sp. different or a different organism (for example, a plant, prokaryote and photosynthetic eukaryote) or functional variants of any of the above. In particular embodiments, a contiguous nucleotide sequence can be obtained from an orthologous nucleotide sequence of the reference Brassica CTP which is obtained from an orthologist of an organism other than the Brassica sp gene. reference (for example, a different Brassica sp. genome). In such and additional embodiments, a nucleotide sequence encoding a synthetic Brassica-derived CTP may be a chimeric nucleotide sequence comprising more than one nucleotide sequence encoding CTP.
In some examples, a nucleotide sequence encoding a synthetic Brassica-derived CTP may be a chimeric nucleotide sequence comprising a partial CTP or B. napus or B. rapa nucleotide sequence or functional variants thereof. In specific examples, a nucleotide sequence encoding a CTP derived from synthetic Brassica may contain contiguous nucleotide sequences obtained from each of B. napus and B. rapa or their functional variants.
In some embodiments, a composition comprises a nucleic acid molecule comprising at least one medium derived
6/161 from Brassica for targeting a polypeptide to a chloroplast. Also described are nucleic acid molecules comprising a nucleic acid molecule comprising at least one medium derived from Brassica for targeting a polypeptide to a chloroplast operably linked to a nucleotide sequence of interest. In particular embodiments, such nucleic acid molecules may be useful for expressing and targeting a polypeptide encoded by the nucleotide sequence of interest in a monocot or dicot plant. For the purposes of the present invention, a Brassica-derived medium for targeting a polypeptide to a chloroplast refers to particular synthetic nucleotide sequences. In particular embodiments, a media derived from Brassica for targeting a polypeptide to a chloroplast is selected from the group consisting of the nucleotide sequences encoding the polypeptides referred to herein as TraP8 and TraP9.
Also described here are plant materials (for example and without limitation, plants, plant tissues and plant cells) comprising a nucleic acid molecule comprising at least one nucleotide sequence encoding a synthetic Brassica-derived CTP operably linked to a sequence of nucleotide of interest. In some embodiments, a plant material may have such a nucleic acid molecule stably integrated into its genome. In some embodiments, a plant material may transiently express a product of a nucleic acid molecule comprising at least one nucleotide sequence encoding a synthetic Brassica-derived CTP operably linked to a nucleotide sequence of interest. In some embodiments, the plant material is a plant cell from which a plant cannot be regenerated.
Also described are methods for expressing a nucleotide sequence in a plastid-containing cell (eg, a plant) in a plastid (eg, a chloroplast) of the plastid-containing cell. In particular embodiments, a nucleic acid molecule comprising at least one nucleotide sequence encoding a
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Synthetic Brassica-derived CTP operably linked to a nucleotide sequence of interest can be used to transform a plant cell, so that a precursor fusion polypeptide comprising synthetic Brassica-derived CTP fused to an expression product of the nucleotide sequence of interest is produced in the cytoplasm of the plant cell, and the fusion polypeptide is then transported in vivo to a chloroplast of the plant cell. In some embodiments, the plant cell is not capable of regeneration for a plant.
There are also described methods for producing a transgenic plant comprising a nucleic acid molecule comprising at least one nucleotide sequence encoding a synthetic Brassica-derived CTP operably linked to a nucleotide sequence of interest. Plant consumption products (for example, seeds) produced from such transgenic plants are also described. In some embodiments, these transgenic plants or plant consumer products contain transgenic cells from which a plant cannot be regenerated.
The above and other characteristics will become more apparent from the detailed description that follows of various modalities, which continues with reference to the accompanying Figures.
BRIEF DESCRIPTION OF THE FIGURES
Figure 1 illustrates an mRNA molecule that is representative of particular examples of nucleotide sequences encoding synthetic Brassica-derived CTP (e.g., for TraP8 and TraP9) operably linked to a nucleotide sequence of interest. In some embodiments, an mRNA molecule (such as that shown) can be transcribed from a DNA molecule comprising an operon reading structure including the synthetic Brassica-derived CTP encoding sequence operably linked to the nucleotide sequence of interest. The nucleotide sequence of interest may, in some embodiments, be a sequence encoding a peptide of interest, for example and without limitation, a marker gene product or peptide to be targeted
8/161 to a plastid.
Figure 2 illustrates a plasmid map of pDAB101977.
Figure 3 illustrates a plasmid map of pDAB101978.
Figure 4 illustrates a plasmid map of pDAB101908.
Figure 5 includes a microscope image showing that TraP8-YFP infiltrated in the tobacco leaf tissue was transported to the tobacco leaf tissue chloroplast.
Figure 6 includes a microscope image showing that TraP9-YFP infiltrated in the tobacco leaf tissue was transported to the tobacco leaf tissue chloroplast.
Figure 7 includes a microscope image showing that undirected YFP controls that have been infiltrated into tobacco leaf tissue have not been incorporated into the tobacco leaf tissue chloroplasts.
Figure 8 illustrates a plasmid map of pDAB106597.
Figure 9 includes a microscope image of the TraP8-YFP construct transformed into corn protoplasts showing the transport to the corn protoplasty chloroplasts.
Figure 10 illustrates a plasmid map of pDAB105526.
Figure 11 illustrates a plasmid map of pDAB105527.
Figure 12 illustrates a plasmid map of pDAB109807.
Figure 13 illustrates a plasmid map of pDAB107687.
Figure 14 illustrates a plasmid map of pDAB111481.
Figure 15 illustrates a plasmid map of pDAB111479.
Figure 16 illustrates a plasmid map of pDAB111338.
Figure 17 illustrates a plasmid map of pDAB112710.
Figure 18 includes an alignment of the predicted chloroplast transit peptides for the EPSPS protein of Brassica napus (SEQ ID NO: 1) and Brassica rapa (SEQ ID NO: 2). Asterisks indicate where the sequences were separated and recombined to form TraP8 and TraP9.
SEQUENCE LISTING
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The nucleic acid sequences listed in the accompanying sequence listing are shown using standard letter abbreviations for nucleotide bases, as defined in 37 C.F.R. § 1.822. Only one strand of each nucleic acid sequence is shown, but the complementary strand is understood to be included by any reference to the displayed strand. In the accompanying sequence listing:
SEQ ID NO: 1 shows the amino acid of an EPSPS chloroplast transit peptide from Brassica napus.
SEQ ID NO: 2 shows the amino acid of an EPSPS chloroplast transit peptide from Brassica rapa.
SEQ ID NO: 3 shows the amino acid of a chimeric chloroplast transit peptide TraP8.
SEQ ID NO: 4 shows the amino acid of a chimeric chloroplast transit peptide TraP9.
SEQ ID NO: 5 shows a polynucleotide sequence encoding a chimeric chloroplast transit peptide TraP8.
SEQ ID NO: 6 shows a nucleotide sequence encoding a chimeric chloroplast transit peptide TraP9.
SEQ ID NO: 7 shows a nucleotide sequence encoding a linker sequence.
SEQ ID NO: 8 shows a polynucleotide sequence encoding a chimeric chloroplast transit peptide TraP8 v2.
SEQ ID NO: 9 shows a nucleotide sequence encoding a chimeric chloroplast transit peptide TraP9 v2.
SEQ ID NO: 10 shows a polynucleotide sequence encoding a cry2Aa gene.
SEQ ID NO: 11 shows a polynucleotide sequence encoding a vip3ab1v6 gene.
SEQ ID NO: 12 shows a nucleotide sequence encoding a vip3ab1v7 gene.
SEQ ID NO: 13 shows a peptide having the amino acid sequence Ser-Val-Ser-Leu.
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SEQ ID NO: 14 shows a polynucleotide sequence encoding the EPSPS chloroplast transit peptide from Brassica napus of SEQ ID NO: 1.
SEQ ID NO: 15 shows a polynucleotide sequence encoding the EPSPS chloroplast transit peptide from Brassica rapa. DETAILED DESCRIPTION
/. Overview of various modalities
A chloroplast transit peptide (CTP) (or plastid transit peptide) works co-translationally or post-translationally to target a polypeptide comprising the CTP to a plastid (for example, a chloroplast). In some embodiments of the invention, either endogenous chloroplast proteins or heterologous proteins can be targeted to a chloroplast through expression of such a protein as a major precursor polypeptide comprising a CTP. In particular embodiments, a CTP can be derived from a nucleotide sequence obtained from a Brassica sp. Gene, for example and without limitation, by incorporating at least one continuous sequence from an ortholog gene obtained from a different organism or a variant functional.
In an exemplary embodiment, nucleic acid sequences, each encoding a CTP, were isolated from EPSPS gene sequences obtained from Brassica napus (Accession No. NCBI P17688 database) and Brassica rapa (Accession No. Database NCBI AAS80163). The nucleic acid sequences encoding CTP were isolated by analyzing the EPSPS gene sequence with the ChloroP prediction server. Emanuelsson et al. (1999), Protein Science 8: 978-84 (available at cbs.dtu.dk/services/ChloroP). The predicted protein products of the isolated CTP coding sequences are transit peptides of approximately 60-70 amino acids in length. In this example, the native B. napus CTP was used as a reference sequence to design exemplary synthetic Brassica-derived CTPs by fusing contiguous sequences from other CTPs at a particular position in the B. napus CTP. This design process illustrates the development of a new
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Synthetic CTP, according to some aspects, from a nucleic acid sequence of Brassica sp. Such exemplary synthetic Brassica-derived CTPs are referred to in the invention as TraP8 and TraP9. These exemplary synthetic TraPs were tested for the plastid targeting function and were found to exhibit plastid targeting that was at least as favorable as that observed for the native Brassica sequences individually.
In an additional exemplary embodiment, nucleic acid sequences, each encoding a synthetic TraP peptide of the invention, were independently synthesized and operably linked to a nucleic acid sequence encoding a yellow fluorescent protein (YFP) (Yellow Fluorescent Protein) to produce molecules of synthetic nucleic acid, each encoding a chimeric TraP: YFP fusion polypeptide. Such nucleic acid molecules, each encoding a chimeric TraP: YFP polypeptide, were each introduced into a binary vector, so that each nucleic acid sequence encoding TraP: YFP was operably linked to an AtUbi 10 promoter.
In yet an exemplary embodiment, binary vectors comprising a nucleic acid sequence encoding TraP: YFP operably linked to an AtUbi 10 promoter were each, independently, transiently transformed into tobacco (Nicotiana benthamiana) through Agrobacterium-mediated transformation. Confocal microscopy and Western blot analysis confirmed that each TraP successfully targeted YFP to tobacco chloroplasts.
In an additional exemplary embodiment, nucleic acid sequences, each encoding a synthetic TraP peptide of the invention, were independently synthesized and operably linked to a nucleic acid sequence encoding an agronomically important gene sequence. TraP sequences have been fused to herbicide-tolerant characteristics (eg, dgt-28 and dgt-14) to produce synthetic nucleic acid molecules, each encoding a TraP fusion polypeptide: DGT-28 or TraP: DGT-14. Such nucleic acid molecules, each
12/161 encoding a chimeric TraP: DGT-28 or TraP: DGT-14 polypeptide, were each introduced into a binary vector, so that each nucleic acid sequence encoding TraP: DGT-28 or TraP: DGT-14 it has been operably linked to a promoter and other gene regulatory elements. The binary containing the nucleic acid sequence encoding TraP: DGT-28 or TraP: DGT-14 was used to transform varopis plant species. The transgenic plants were tested for herbicide tolerance as a result of the expression and translocation of the enzymes DGT-28 or DGT-14 to the chloroplast.
In an additional exemplary embodiment, nucleic acid sequences, each encoding a synthetic TraP peptide of the invention, were independently synthesized and operably linked to a nucleic acid sequence encoding an agronomically important gene sequence. TraP sequences have been fused to genes conferring insect tolerance characteristics (for example, cry2Aa and vip3ab1) to produce synthetic nucleic acid molecules, each encoding a chimeric TraP: Cry2Aa or TraP: Vip3ab 1 fusion polypeptide. Such nucleic acid molecules, each encoding a TraP: Cry2Aa or TraP: Vip3ab1 polypeptide, were each introduced into a binary vector, so that each nucleic acid sequence encoding TraP: Cry2Aa or TraP: Vip3ab1 was operably linked to a promoter and the other gene regulatory elements. The binary containing the nucleic acid sequence encoding TraP: Cry2Aa or TraP: V / p3ab7 was used to transform various plant species. The transgenic plants were bioassayed for insect resistance as a result of the expression and translocation of the enzymes Cry2Aa or Vip3ab1 to the chloroplast.
In view of the detailed working examples mentioned above, Brassica-derived CTP sequences of the invention, and nucleic acids encoding them, can be used to target any polypeptide to a plastid in a wide range of plastid-containing cells. For example, through the methods made available to those skilled in the art by the present invention, a chimeric polypeptide comprising
13/161 Giving a CTP sequence derived from synthetic Brassica fused to the N-terminus of any second peptide sequence can be introduced into (or expressed in) a plastid containing host cell for targeting the plastid of the second peptide sequence. In this way, in particular embodiments, a TraP peptide of the invention can provide increased efficiency of importing and processing a peptide for which plastid expression is desired, when compared to a native CTP.
II. Abbreviations
CTP chloroplast transit peptide
Bt bacillus thuringiensis
EPSPS 3-enolpyruvylchiquime-5-phosphate synthase
YFP fluorescent yellow protein
Ti tumor induction (plasmids derived from A. tumefaciens)
T-DNA Transfer DNA
III, Terms
In order to facilitate review of the various modalities of the invention, the following explanations of specific terms are provided:
Chloroplast transit peptide: As used herein, the term chloroplast transit peptide (CTP) (or plastid transit peptide) can refer to an amino acid sequence that, when present at the N-terminus of a polypeptide, directs the import from the polypeptide to a plastid of a cell containing a plastid (for example, a plant cell, such as in an entire plant or plant cell culture). A CTP is generally necessary and sufficient to direct the import of a protein into a plastid (for example, a primary, secondary or tertiary plastid, such as a chloroplast) from a host cell. A putative chloroplast transit peptide can be identified by one of several available algorithms (for example, PSORT and ChloroP (available at cbs.dtu.dk/services/ChloroP)). ChloroP can provide particularly good forecasting of CTPs. Emanuelsson et al. (1999), Protein Science 8: 978-84. However, prediction of functional CTPs is not obtained in
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100% efficiency by an existing algorithm. Thus, it is important to verify that an identified putative CTP does not actually work as intended in, for example, an in vitro or in vivo methodology.
Chloroplast transit peptides can be located at the N-terminus of a polypeptide that is imported into a plastid. CTP can facilitate co- or post-translational transport of a polypeptide comprising CTP to the plastid. Chloroplast transit peptides typically comprise between about 40 and about 100 amino acids, and such CTPs have been found to contain certain common characteristics. For example: CTPs contain very few, if any, negatively charged amino acids (such as aspartic acid, glutamic acid, asparagines or glutamine); the N-terminal regions of CTPs do not have charged amino acids, glycine and proline; the central region of a CTP is also likely to contain a very high proportion of basic or hydroxylated amino acids (such as serine and threonine); and the C-terminal region of a CTP is likely to be rich in arginine, and has the ability to understand an amphiphatic beta-leaf structure. Plastid proteases can cleave the CTP from the rest of a polypeptide comprising the CTP after importing the polypeptide into the plastid.
Contact: As used herein, the term contact with or absorption by a cell, tissue or organism (for example, a plant cell; plant tissue; and plant), with respect to a nucleic acid molecule, includes internalization of the molecule of nucleic acid in the organism, for example and without limitation: contact of the organism with a composition comprising the nucleic acid molecule; and rinsing the organisms with a solution comprising the nucleic acid molecule.
Endogenous: As used herein, the term endogenous refers to substances (for example, nucleic acid molecules and polypeptides) that originate from within a particular organism, tissue or cell. For example, an endogenous polypeptide expressed in a plant cell can refer to a polypeptide that is normally expressed in cells of the same type of non-genetically engineered plants of the same type.
15/161 species. In some examples, an endogenous gene (for example, an EPSPS gene) from a Brassica sp. can be used to obtain a reference Brassica CTP sequence.
Expression: As used herein, expression of a coding sequence (for example, a gene or a transgene) refers to the process by which the encoded information from a transcriptional nucleic acid unit (including, for example, genomic DNA or cDNA ) is converted into an operational, non-operational or structural part of a cell, often including protein synthesis. Gene expression can be influenced by external signals; for example, exposure of a cell, tissue or organism to an agent that increases or decreases gene expression. Expression of a gene can also be regulated at any point in the course of DNA to RNA to protein. Regulation of gene expression occurs, for example, through controls acting on transcription, translation, transport and processing of RNA, degradation of intermediate molecules such as mRNA, or through activation, inactivation, compartmentalization or degradation of specific protein molecules after them made, or through combinations thereof. Gene expression can be measured at the RNA level or at the protein level using any method known in the art, for example, and without limitation: Northern blot; RT-PCR; Western biot, or protein activity assay (s) in vitro in sitw, and in vivo.
Genetic material: As used herein, the term genetic material includes all genes, and nucleic acid molecules, such as DNA and RNA.
Heterologist: As used herein, the term heterologous refers to substances (for example, nucleic acid molecules and polypeptides) that do not originate from within a particular organism, tissue or cell. For example, a heterologous polypeptide expressed in a plant cell can refer to a polypeptide that is not normally expressed in cells of the same type of non-genetically engineered plants of the same species (for example, a polypeptide that is expressed in cells
16/161 cells from the same organism or cells from a different organism).
Isolated: As used herein, the term isolated refers to molecules (for example, nucleic acid molecules and polypeptides) that are substantially separated or purified from other molecules of the same type (for example, other nucleic acid molecules and other polypeptides) with which the molecule is normally associated in the organism's cell where the molecule naturally occurs. For example, an isolated nucleic acid molecule can be substantially separated or purified from chromosomal DNA or extrachromosomal DNA in the organism's cell where the nucleic acid molecule occurs naturally. In this way, the term includes nucleic acid molecules and recombinant polypeptides that are biochemically purified so that other nucleic acid molecules, polypeptides and cellular components are removed. The term also includes recombinant nucleic acid molecules, chemically synthesized nucleic acid molecules and recombinantly produced polypeptides.
The term substantially purified, as used herein, refers to a molecule that is separated from other molecules normally associated with it in its native state. A substantially purified molecule can be the predominant species present in a composition. A substantially purified molecule can, for example, be at least 60% free, at least 75% free or at least 90% free from other molecules in addition to a solvent present in a natural mixture. The term substantially purified does not refer to molecules present in their native state.
Nucleic acid molecule: As used herein, the term nucleic acid molecule refers to a polymeric form of nucleotides, which can include both sense and antisense filaments of RNA, cDNA, genomic DNA and synthetic and mixed polymer forms of the above. A nucleotide can refer to a ribonucleotide, deoxyribonucleotide or a modified form of any type of nucleotide. A nucleic acid molecule as used here is synonymous with nucleic acid and poly
17/161 nucleotide. A nucleic acid molecule is generally at least 10 bases in length, unless otherwise specified. The term includes single and double stranded forms of DNA. Nucleic acid molecules include dimeric forms (called tandem) and the transcription products of nucleic acid molecules. A nucleic acid molecule can include either one or both naturally occurring and modified nucleotides linked by naturally occurring and / or non-naturally occurring nucleotide bonds.
Nucleic acid molecules can be modified chemically or biochemically or can contain unnatural or derivatized nucleotide bases, as will be readily understood by those of skill in the art. Such modifications include, for example, markers, methylation, replacement of one or more of the naturally occurring nucleotides with an analog, internucleotide modifications (for example, uncharged bonds: for example, methyl phosphonates, phosphotriesters, phosphoramidates, carbamates, etc .; charged bonds: for example, phosphorothioates, phosphorodithioates; etc; pending portions: for example, peptides; intercalators: for example, acridine, psoralen, etc.; chelators; alkylators; and modified bonds: for example, alpha anomeric nucleic acids, etc.). The term nucleic acid molecule also includes any topological conformation, including single-stranded, double-stranded, partially duplexed, triplexed, hairpin, circular and padlocked.
As used herein with respect to DNA, the term coding sequence ", structural nucleotide sequence" or structural nucleic acid molecule refers to a nucleotide sequence that is ultimately translated into a polypeptide, through transcription and mRNA, when put under the control of appropriate regulatory sequences. With respect to RNA, the term coding sequence refers to a nucleotide sequence that is translated into a peptide, polypeptide or protein. The limits of a coding sequence are determined by a translation start codon at terminal 5 'and a translation stop codon at terminal 3'.
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Coding sequences include, but are not limited to: genomic DNA; cDNA; ESTs; and recombinant nucleotide sequences.
In some embodiments, the invention includes nucleotide sequences that can be isolated, purified or partially purified, for example, using separation methods such as, for example, ion exchange chromatography; through exclusion based on molecular size or through affinity; through fractionation techniques based on solubility in different solvents; and genetic engineering methods such as amplification, cloning and subcloning.
Sequence identity: The term sequence identity or identity, as used herein in the context of two nucleic acid or polypeptide sequences, can refer to residues in the two sequences that are equal when aligned for maximum matching in a specified comparison window.
As used herein, the term percent sequence identity can refer to the value determined by comparing two optimally aligned sequences (for example, nucleic acid sequences and amino acid sequences) in a comparison window, where the portion of the sequence in The comparison window can comprise additions or deletions (i.e., gaps) compared to the reference sequence (which does not comprise additions or deletions) for optimal alignment of the two sequences. The percentage is calculated by determining the number of positions in which the identical nucleotide or nucleic acid residue occurs in both sequences to give the number of compatible positions, dividing the number of compatible positions by the total number of positions in the comparison window and multiplying the result by 100 to give the sequence identity percentage.
Methods for aligning sequences for comparison are well known in the art. Various programs and alignment algorithms 30 are described in, for example: Smith and Waterman (1981), Adv. Appl. Math.
2: 482; Needleman and Wunsch (1970), J. Mol. Biol. 48: 443; Pearson and Lipman (1988); Proc. Natl. Acad. Know. U.S.A. 85: 2444; Higgins and Sharp (1988), Gene
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73: 237-44; Higgins and Sharp (1989); CABIOS 5: 151-3; Corpet et al (1988), Nucleic Acids Res. 16: 10881-90; Huang et al (1992), Comp. Appl. Biosci. 8: 155-65; Pearson et al. (1994), Methods Mol. Biol. 24: 307-31; Tatiana et al. (1999), FEMS Microbiol. Lett. 174: 247-50. A detailed consideration of sequence alignment methods and homology calculations can be found in, for example, Altschul et al. (1990), J. Mol. Biol. 215: 403-10.
The National Center for Biotechnology Information (NCBI) Basic Local Alignment Search Too! (BLAST®; Altschul et al. (1990)) is available from several sources, including the National Center for Biotechnology Information (Bethesda, MD) and on the internet, for use in conjunction with various sequence analysis programs. A description of how to determine sequence identity using this program is available on the internet under the help section for BLAST®. For nucleic acid sequence comparisons, the Blast2 sequences function of the BLAST® program (Blastn) can be used using the BLOSUM62 default matrix setting for default parameters. Nucleic acid sequences with even greater similarity to the reference sequences will show high percentage identity when evaluated using this method.
Specifically hybridizable / Specifically complementary: As used herein, the terms specifically hybridizable and specifically complementary are terms that indicate a sufficient degree of complementarity, so that stable and specific binding occurs between the nucleic acid molecule and a target nucleic acid molecule. Hybridization between two nucleic acid molecules involves the formation of an antiparallel alignment between the nucleic acid sequences of the two nucleic acid molecules. The two molecules are then capable of forming hydrogen bonds with corresponding bases in the opposite strand to form a duplex molecule which, if it is sufficiently stable, is detectable using methods well known in the art. A nucleic acid molecule does not have to be 100% complementary to its target sequence to be specifically hybridizable. However, the amount of sequence complement that must exist for hybridization to be specific is a function of the hybridization conditions used.
Hybridization conditions resulting in particular degrees of astringency will vary depending on the nature of the hybridization method of choice and the composition and length of the hybridization nucleic acid sequences. In general, the hybridization temperature and ionic resistance (especially the concentration of Na ⁺ and / or Mg ⁺⁺ ) of the hybridization buffer will determine the hybridization astringency, although wash times also influence astringency. Calculations regarding hybridization conditions required to achieve particular astringency levels are known to those of ordinary skill in the art and are discussed, e.g., in Sambrook et al (ed.) , Molecular Cloning:. A Laboratory Manual, 2nd ed, vol . 1-3, Cold Spring Harbor Laboratory Press, Cold Spring Harbor, NY, 1989, chapters 9 and 11; and Hames and Higgins (eds.) Nucleic Acid Hybridization, IRL Press, Oxford, 1985. Detailed instructions and guidance regarding the hybridization of nucleic acids can be found, for example, in Tijssen, Overview of principies of hybrídization and the strategy of nucleic acid probe assays, in Laboratory Techniques in Biochemistry and Molecular Biology - Hybridization with Nucleic Acid Probes, Part I, Chapter 2, Elsevier, NY, 1993; and Ausubel et al., Eds., Current Protocols in Molecular Biology, Chapter 2, Greene Publishing and Wiley-Interterscience, NY, 1995.
As used herein, astringent conditions comprise conditions under which hybridization will only occur if there is less than 20% incompatibility between the hybridization molecule and a homologous sequence within the target nucleic acid molecule. Astringent conditions include additional particulate astringency levels. Thus, as used here, conditions of moderate astringency are those under which molecules with more than 20% of sequence incompatibility will not hybridize; high astringency conditions are those under which strings with more than 10% incompatibility will not hybridize; and very high astringency conditions are those under the
21/161 which sequences with more than 5% incompatibility will not hybridize.
What follows are representative, non-limiting hybridization conditions.
High astringency condition (detects sequences that share at least 90% sequence identity): Hybridization in 5x SSC buffer at 65 ° C for 16 hours; wash twice in 2x SSC buffer at room temperature for 15 minutes each; and wash twice in 0.5x SSC buffer at 65 ° C for 20 minutes each.
Moderate Astringency Condition (detects sequences that share at least 80% sequence identity): Hybridization in 5x-6x SSC buffer at 65-70 ° C for 16-20 hours; wash twice in 2x SSC buffer at room temperature for 5-20 minutes each; and wash twice in 1x SSC buffer at 55-70 ° C for 30 minutes each.
Non-astringent control condition (sequences that share at least 50% sequence identity will hybridize): Hybridization in 6x SSC buffer at room temperature to 55 ° C for 16-20 hours; wash at least twice in 2x-3x SSC buffer at room temperature to 55 ° C for 20-30 minutes each.
As used herein, the term substantially homologous or substantial homology, with respect to a contiguous nucleic acid sequence, refers to contiguous nucleotide sequences that hybridize under astringent conditions to the reference nucleic acid sequence. For example, nucleic acid sequences that are substantially homologous to a reference nucleic acid sequence are those nucleic acid sequences that hybridize under astringent conditions (for example, the Moderate Astringency conditions shown, supra) to the nucleic acid sequence of reference. Substantially homologous sequences can have at least 80% sequence identity. For example, substantially homologous sequences may have from about 80% to 100% sequence identity, such as about 81%; about 82%; about 83%; about 84%; about 85%; about 86%; about 87: about 88%; about 89%; about 90%; about
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91%; about 92%; about 93%; about 94%; about 95%; about 96%; about 97%; about 98%: about 98.5%; about 99.5%; and about 100%. The property of substantial homotogy is closely related to specific hybridization. For example, a nucleic acid molecule is specifically hybridizable when there is a sufficient degree of complementarity to avoid non-specific binding of the nucleic acid to non-target sequences under conditions where specific binding is desired, for example, under astringent hybridization conditions.
As used herein, the term orthologist (or orthologists) refers to a gene in two or more species that evolved from a common ancestral nucleotide sequence and can retain the same function in the two or more species.
As used herein, two nucleic acid sequence molecules are said to exhibit complete complementarity when each nucleotide in a sequence read in the 5 'to 3' direction is complementary to each nucleotide in the other sequence when read in the 3 'to 5' direction. A nucleotide sequence that is complementary to a reference nucleotide sequence will exhibit a sequence identical to the reverse complement sequence of the reference nucleotide sequence. These terms and descriptions are well defined in the art and are easily understood by those of ordinary skill in the art.
When determining the percentage of sequence identity between amino acid sequences, it is well known to those of skill in the art that the identity of the amino acid in a given position provided by an alignment can differ without affecting desired properties of the polypeptides comprising the aligned sequences. In such cases, the percentage sequence identity can be adjusted to allow similarity between conservatively substituted amino acids. These adjustments are well known and generally used by those of skill in the art. See, for example, Myers and Miller (1988), Computer Applications in Biosciences 4: 11-7.
The embodiments of the invention include functional variants of
23/161 exemplary plastid transit peptide amino acid sequences and nucleic acid sequences performing their coding. A functional variant of an exemplary transit peptide sequence can be, for example, a fragment of an exemplary transit peptide amino acid sequence (such as an N-terminal or C-terminal fragment) or a modified sequence of an exemplary full-length transit peptide amino acid or fragment of an exemplary transit peptide amino acid sequence. An exemplary transit peptide amino acid sequence can be modified in some embodiments by introducing one or more conservative amino acid substitutions. A conservative amino acid substitution is one where the amino acid residue is replaced by an amino acid residue having a similar functional side chain, similar size and / or similar hydrophobicity. Families of amino acids that can be used to replace another amino acid in the same family to introduce a conservative substitution are known in the art. For example, these amino acid families include: basic amino acids (for example, lysine, arginine and histidine); acidic amino acids (for example, aspartic acid and glutamic acid); uncharged polar amino acids (for example, glycine, asparagines, glutamine, serine, threonine, tyrosine and cytosine); non-polar amino acids (for example, alanine, valine, leucine, isoleucine, proline, phenylalanine, methionine and tryptophan); beta-branched amino acids (for example, threonine, valine and isoleucine); and aromatic amino acids (for example, tyrosine, phenylalanine, tryptophan and histidine). See, for example, Sambrook et al. (Eds.), Supra, and Innis et al., PCR Protocols: A Guide to Methods and Applications, 1990, Academic Press, NY, USA.
Operably linked: A first nucleotide sequence is operably linked with a second nucleotide sequence when the first nucleotide sequence is in a functional relationship with the second nucleotide sequence. For example, a promoter is operably linked to a coding sequence if the promoter affects the transcription or expression of the coding sequence. When recombine
24/161 produced, operably linked nucleotide sequences are generally contiguous and, where necessary to join two protein coding regions, in the same reading frame. However, nucleotide sequences do not need to be contiguous to be operably linked.
The term operably linked, when used in reference to a regulatory sequence and a coding sequence, means that the regulatory sequence affects the expression of the linked coding sequence. Regulatory sequences or control elements refer to nucleotide sequences that influence the timing and level / amount of RNA transcription, processing or stability or translation of the associated coding sequence. Regulatory strings can include promoters; leading translation strings; introns; enhancers; rod-handle structures; repressor binding sequences; termination sequences; polyadenylation recognition sequences; etc. Particular regulatory sequences can be located upstream and / or downstream of a coding sequence operably linked to them. Also, particular regulatory sequences operably linked to a coding sequence can be located on the associated complementary strand of a double-stranded nucleic acid molecule.
When used in reference to two or more amino acid sequences, the term operably linked means that the first amino acid sequence is in a functional relationship with at least one of the additional amino acid sequences. For example, a transit peptide (e.g., a CTP) is operably linked to a second amino acid sequence within a polypeptide comprising both sequences if the transit peptide affects the expression or traffic of the polypeptide or second amino acid sequence.
Promoter: As used herein, the term promoter refers to a region of DNA that may be upstream of the start of transcription and that may be involved in the recognition and binding of RNA polymerase and other proteins to initiate transcription. A promoter can be operably linked to a coding sequence for expression in
25/161 a cell or a promoter can be operably linked to a nucleotide sequence encoding a signal sequence that can be operably linked to a coding sequence for expression in a cell. A plant promoter can be a promoter capable of initiating transcription in plant cells. Examples of promoters under developmental control include promoters that preferably initiate transcription in certain tissues, such as leaves, roots, seeds, fibers, xylem vessels, tracheids or sclerenchyma. Such promoters are referred to as tissue favorites. Promoters that initiate transcription only in certain tissues are referred to as tissue specific. A cell type-specific promoter directs expression mainly on certain types in one or more organs, for example, vascular cells in roots or leaves. An inducible promoter may be a promoter that may be under environmental control. Examples of environmental conditions that can initiate transcription by inducible promoters include anaerobic conditions and the presence of light. Tissue-specific, tissue-preferred, cell-type and inducible promoters constitute the class of non-constitutive promoters. A constitutive promoter is a promoter that can be active under most environmental conditions.
Any inducible promoter can be used in some embodiments of the invention. See Ward et al. (1993), Plant Mol. Biol. 22: 361-366. With an inducible promoter, the rate of transcription increases in response to an inducing agent. Exemplary inducible promoters include, but are not limited to: Promoters of the ACEI system that responds to copper; corn In2 gene that responds to benzenesulfonamide herbicide protectors; Tn10 Tet repressor; and the inducible promoter of a steroid hormone gene, whose transcriptional activity can be induced by a glucocorticosteroid hormone (Schena et al. (1991), Proc. Natl. Acad. Sci. USA 88: 0421).
Exemplary constitutive promoters include, but are not limited to: Plant virus promoters, such as the CaMV 35S promoter; promoters of the rice actin gene; ubiquitin promoters;
26/161 pEMU; BUT; corn histone H3 promoter; and the ALS promoter, fragment Xba1 / Ncol 5 'for the structural gene ALS3 of Brassica napus (or a nucleotide sequence similarity with said fragment Xba1 / Ncol) (International PCT Publication No. WO 96/30530).
In addition, any tissue-specific or tissue-preferred promoter can be used in some embodiments of the invention. Plants transformed with a nucleic acid molecule comprising a coding sequence operably linked to a tissue-specific promoter can produce the product of the coding sequence exclusively, or preferably, in a specific tissue. Exemplary tissue-specific or tissue-preferred promoters include, but are not limited to: a preferred root promoter, such as that of the phaseolin gene; a leaf-specific and light-induced promoter such as that of cab or rubisco :. an anther specific promoter such as that of LAT52 a pollen specific promoter such as that of Zm13 ', and a preferred microspore promoter such as that of apg.
Transformation: As used herein, the term transformation or transduction refers to a transfer of one or more nucleic acid molecules to a cell. A cell is transformed by a nucleic acid molecule transduced into the cell when the nucleic acid molecule becomes stably replicated by the cell, either through incorporation of the nucleic acid molecule into the cell genome or through episomal replication. As used herein, the term transformation comprises all the techniques by which a nucleic acid molecule can be introduced into such a cell. Examples include, but are not limited to: transfection with viral vectors; transformation with plasmid vectors; electroporation (Fromm et al. (1986), Nature 319: 791-3); lipofection (Felgner et al (1987), Proc. Natl. Acad. Sci. USA 84: 7413-7); microinjection (Mueller et al (1978), Cell 15: 579-85); Agrobacterium-mediated transfer (Fraley et al. (1983), Proc. Natl. Acad. Sci. USA 80: 4803-7); direct DNA absorption; and microinjection bombardment (Klein et al. (1987), Nature 327: 70).
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Transgene: An exogenous nucleic acid sequence. In some examples, a transgene can be a sequence that encodes a polypeptide comprising at least one CTP derived from synthetic Brassica. In particular examples, a transgene can be encoded by a polypeptide comprising at least one synthetic Brassica-derived CTP and at least one additional peptide sequence (for example, a peptide sequence that confers herbicide resistance), for which plastid expression it is desirable. In these and other examples, a transgene can contain regulatory sequences operably linked to a transgene coding sequence (for example, a promoter). For the purposes of the present invention, the term transgenic when used to refer to an organism (for example, a plant) refers to an organism that comprises the exogenous nucleic acid sequence. In some examples, the organism comprising the exogenous nucleic acid sequence may be an organism into which the nucleic acid sequence has been introduced using molecular transformation techniques. In other examples, the organism comprising the exogenous nucleic acid sequence may be an organism into which the nucleic acid sequence has been introduced through, for example, introgression or cross-pollination in a plant.
Transport: As used herein, the terms transport (s), target (s) and transfer (s) refer to the property of certain amino acid sequences of the invention that facilitate the movement of a polypeptide comprising the amino acid sequence of the nucleus of a cell host to a host cell plastid. In particular embodiments, such an amino acid sequence (i.e., a CTP sequence derived from synthetic Brassica) may be able to transport about 100%, at least about 95%, at least about 90%, at least about 85 %, at least about 80%, at least about 70%, at least about 60% and / or at least about 50% of a polypeptide comprising the plastid amino acid sequence of a host cell.
Vector: A nucleic acid molecule is introduced into a cell, for example, to produce a transformed cell. A vector can
28/161 include nucleic acid sequences that allow it to replicate in the host cell, such as an origin of replication. Examples of vectors include, but are not limited to: a plasmid; cosmid; bacteriophage; or virus that carries exogenous DNA into a cell. A vector can also include one or more genes, antisense molecules and / or selectable marker genes and other genetic elements known in the art. A vector can transduce, transform or infect a cell, thus causing the cell to express the nucleic acid molecules and / or proteins encoded by the vector. A vector optionally includes materials to assist in obtaining entry of the nucleic acid molecule into the cell (for example, a liposome, protein coating, etc.).
Unless specifically indicated or implied, the terms one, one, o and a mean at least one, as used herein.
Unless otherwise specifically explained, all technical and scientific terms used herein have the same meaning as is generally understood by those of ordinary skill in the art to which the present invention belongs. Definitions of common terms in molecular biology can be found in, for example, Lewin, B., Genes V, Oxford University Press, 1994 (ISBN 0-19-854287-9); Kendrew et al. (Eds.), The Encydopedia of Molecular Biology, Blackwell Science, Ltd., 1994 (ISBN 0-632-02182-9); and Meyers R.A. (ed.), Molecular Biology and Biotechnology: A Comprehensive Desk Reference, VCH Publishers, Inc., 1995 (ISBN 1-56081-569-8). All percentages are by weight and all solvent mixture ratios are by volume unless otherwise noted. All temperatures are in degrees Celsius.
IV. Nucleic acid molecules comprising a CTP coding sequence derived from synthetic Brassica
In some embodiments, the present invention provides a nucleic acid molecule comprising at least one nucleotide sequence encoding a synthetic Brassica-derived CTP operably linked to a nucleotide sequence of interest. In particular embodiments, the nucleotide sequence of interest can be a sequence
29/161 nucleotide encoding a polypeptide of interest. In particular examples, a single nucleic acid molecule is provided, which encodes a polypeptide where a sequence of TraPS or TraP9 is fused to the N-terminus of a polypeptide of interest.
A synthetic Brassica-derived CTP can be derived from a Brassica EPSPS gene. In particular examples of such modalities, the EPSPS gene from Brassica may be one that comprises the nucleic acid sequence shown in SEQ ID NO: 14 or a nucleic acid sequence homologous to a different EPSPS gene, or it may be an orthologist of the EPSPS gene of Brassica comprising the nucleic acid sequence shown as SEQ ID NO: 14 (for example, the Brassica EPSPS gene comprising the nucleic acid sequence shown as SEQ ID NO: 15).
In some embodiments, a chloroplast transit peptide derived from Brassica may be a CTP derived from chimeric Brassica. A chimeric Brassica-derived CTP can be derived from a reference Brassica CTP sequence by joining a first contiguous amino acid sequence comprised within the reference Brassica CTP sequence to a second contiguous amino acid sequence comprised within a sequence different CTP (for example, a second Brassica CTP sequence). In particular embodiments, the different CTP sequence comprising the second contiguous amino acid sequence can be encoded by a gene sequence homologous to a genome other than that of Brassica sp. from which the reference sequence was obtained (for example, a different Brassica sp., a plant other than a Brassica sp .; a photosynthetic eukaryote, for example, a Chlorophyte; and a prokaryote, for example, a Cyanobacterium or Agrobacterium). In this way, a nucleotide sequence encoding a synthetic Brassica-derived CTP can be derived from a reference Brassica CTP encoding gene sequence by fusing a nucleotide sequence encoding a contiguous amino acid sequence of the CTP sequence of Reference brassica with a nucleotide sequence that encodes the contiguous amino acid sequence of a
30/161 different CTP sequence that is homologous to the rest of the reference Brassica CTP sequence. In these and other examples, the contiguous amino acid sequence of the reference Brassica CTP sequence can be located at the 5 'or 3' end of the synthetic Brassica-derived CTP.
In some embodiments, a synthetic chimeric Brassica derived CTP can be derived from a plurality of Brassica CTP sequences (including a reference Brassica CTP sequence) by joining a contiguous amino acid sequence comprised within the CTP sequence of Brassica to a contiguous amino acid sequence comprised within a different Brassica CTP sequence. In particular embodiments, the plurality of Brassica CTP sequences can be encoded by hormonal gene sequences in different Brassica species. In some examples, the plurality of Brassica CTP sequences can be exactly two Brassica CTP sequences. In this way, a nucleotide sequence encoding a synthetic chimeric Brassica-derived CTP can be derived from two homologous (e.g. substantially homologous) CTP-encoding gene sequences (e.g., orthologous gene sequences) by fusing the nucleotide sequence encoding a contiguous amino acid sequence from one of the Brassica CTP sequences with the nucleotide sequence encoding the contiguous amino acid sequence from the other Brassica CTP sequences which is homologous to the remainder of the first Brassica CTP sequence. TraP8 and TraP9 are illustrative examples of such a CTP derived from synthetic chimeric Brassica.
One of ordinary skill in the art will understand that, following the selection of a first contiguous amino acid sequence within a Brassica CTP sequence, identification and selection of the contiguous amino acid sequence of the remainder of a homologous CTP sequence according to the process of derivation above are unambiguous and automatic. In some examples, the first contiguous amino acid sequence can be between about 25 and about 41 amino acids in length (for example,
31/161 (example, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41 and 42 amino acids in length). In some embodiments, the first contiguous amino acid sequence within the reference Brassica CTP sequence is defined by the position at the 3 'end of an SVSL motif (SEQ ID NO: 13) which is conserved within some Brassica EPSPS genes.
Examples of CTP sequences derived from synthetic chimeric Brassica according to the above process are represented by SEQ ID NO: 3 and SEQ ID NO: 4. In view of the degeneration of the genetic code, the genus of nucleotide sequences encoding these peptides will be immediately anticipated by a person skilled in the art. Examples of such polynucleotide sequences include SEQ ID NOs: 5, 6, 8 and 9. These particular examples illustrate the structural characteristics of synthetic chimeric Brassica-derived CTPs by incorporating contiguous sequences from a homologous CTP from one of several ESPSP orthologs. of a B. napus ESPSP gene.
Some embodiments include functional variants of a chloroplast transit peptide derived from Brassica and / or nucleic acids encoding it. Such functional variants include, for example and without limitation: a synthetic Brassica-derived CTP coding sequence that is derived from a homolog and / or ortholog from one or both of the Brassica CTP coding sequences shown in SEQ ID NOs: 14 and / or SEQ ID NO: 15 and / or a CTP then encoded; a nucleic acid encoding a synthetic Brassica-derived CTP comprising a contiguous amino acid sequence within SEQ ID NO: 1 and / or SEQ ID NO: 2 and / or a CTP then encoded; a CTP coding sequence derived from truncated synthetic Brassica comprising a contiguous nucleic acid sequence within one of SEQ ID NOs: 5, 6, 8 and 9; a CTP coding sequence derived from truncated synthetic Brassica comprising a contiguous nucleic acid sequence that is substantially homologous to one of SEQ ID NOs: 5, 6, 8 and 9; a CTP derived from truncated synthetic Brassica comprising an amino acid sequence
32/161 contiguous within one of SEQ ID NOs: 3 and 4; a nucleic acid encoding a synthetic Brassica-derived CTP comprising a contiguous amino acid sequence within one of SEQ ID NOs: 5, 6, 8 and 9 and / or a CTP then encoded; a nucleic acid encoding a synthetic Brassica-derived CTP comprising a contiguous amino acid sequence within one of SEQ ID NOs: 3 and 4 that has one or more conservative amino acid substitutions and / or a then encoded CTP; and a nucleic acid encoding a synthetic Brassica-derived CTP comprising a contiguous amino acid sequence within one of SEQ ID NOs: 3 and 4 that has one or more non-conservative amino acid substitutions that are shown to target an operably linked peptide to a plastid in a cell containing a plastid and / or a CTP then encoded.
Accordingly, some embodiments of the invention include a nucleic acid molecule comprising a nucleotide sequence encoding a synthetic chimeric Brassica-derived CTP comprising one or more conservative amino acid substitutions. Such nucleic acid molecules can be useful, for example, in facilitating the manipulation of a CTP coding sequence of the invention in molecular biology techniques. For example, in some embodiments, a CTP coding sequence of the invention can be introduced into a vector suitable for subcloning the sequence into an expression vector or a CTP coding sequence of the invention can be introduced into a nucleic acid molecule that facilitates the production of an additional nucleic acid molecule comprising the CTP-encoding sequence operably linked to a nucleotide sequence of interest. In these and additional modalities, one or more amino acid positions following a CTP derived from synthetic chimeric Brassica can be deleted. For example, the sequence of a CTP derived from synthetic chimeric Brassica can be modified so that the amino acid (s) in position 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 , 12, 13, 14, 15, 16, 17, 18, 19 or 20 in the sequence is / are deleted. An alignment of homologous CTP sequences can be used to provide guidance on which amino acids can be deleted33 / 161 without affecting the function of the synthetic CTP.
In particular examples, a chloroplast transit peptide derived from synthetic Brassica is less than 80 amino acids in length. For example, a CTP derived from synthetic Brassica can be 79, 78, 77, 76, 75, 74, 73, 72, 71, 69, 68, 67, 66, 65, 64, 63, 62, 61.60 or less amino acids in length. In certain examples a CTP derived from synthetic Brassica can be about 65, about 68, about 72 or about 74 amino acids in length. In these and in particular examples, a CTP derived from synthetic Brassica may comprise an amino acid sequence shown in one of SEQ ID NOs: 3 and 4 or a functional variant of any of the above. In this way, a synthetic Brassica-derived CTP may comprise an amino acid sequence comprising one of SEQ ID NOs: 3 and 4 or a functional variant thereof, where the length of the synthetic Brassica-derived CTP is less than 80 amino acids in length. In certain examples, a CTP derived from synthetic Brassica may comprise an amino acid sequence that is, for example, at least 80%, at least 90%, at least 92%, at least 94%, at least 95%, at least 96 %, at least 97%, at least 98%, at least 99% or 100% identical to one of SEQ ID NOs: 3 and 4.
All of the nucleotide sequences encoding a particular synthetic Brassica-derived CTP, for example, the TraP8 peptide of SEQ ID NO: 3 and the TraP9 peptide of SEQ ID NO: 4, or functional variants of any of the above including any deletions and / or conservative amino acid substitutions, will be recognizable to those skilled in the art in view of the present invention. The degeneracy of the genetic code provides a finite number of coding sequences for a particular amino acid sequence. The selection of a particular sequence to encode a CTP derived from synthetic Brassica is the competence of the practitioner. Different coding sequences may be desirable in different applications. For example, to increase the expression of synthetic Brassica-derived CTP in a particular host, a sequence of codes
34/161 tion can be selected, which reflects the tendency to use the host's codon. By way of example, a CTP derived from synthetic Brassica can be encoded by a nucleotide sequence described as one of SEQ ID NOs: 5, 6, 8 and 9.
In nucleic acid molecules provided in some embodiments of the invention, the last codon of a nucleotide sequence encoding a synthetic Brassica-derived CTP and the first codon of a nucleotide sequence of interest can be separated by any number of nucleotide triplets, for example. example, without coding for an intron or a STOP. In some examples, a sequence encoding the first amino acids of a mature protein normally associated with a chloroplast transit peptide in a natural precursor polypeptide may be present between the last codon of a nucleotide sequence encoding a synthetic Brassica-derived CTP and the first codon of a nucleotide sequence of interest. A sequence separating a nucleotide sequence encoding a CTP derived from synthetic Brassica and the first codon of a nucleotide sequence of interest can, for example, consist of any sequence, so that the encoded amino acid sequence is not likely to significantly change the translation of the chimeric polypeptide and its translocation to a plastid. In these and additional modalities, the last codon of a nucleotide sequence encoding a synthetic Brassica-derived chloroplast transit peptide can be fused in phase-recording with the first codon of the nucleotide sequence of interest directly adjacent to it, or separated from it by no more than a short peptide sequence, such as that encoded by a synthetic nucleotide linker (for example, a nucleotide linker that may have been used to obtain the fusion).
In some embodiments, it may be desirable to modify the nucleotides of a nucleotide sequence of interest and / or a CTP coding sequence derived from synthetic Brassica fused to it into a unique coding sequence, for example, to increase expression.
35/161 are from the coding sequence in a particular host. The genetic code is redundant with 64 possible codons, but most organisms preferably use a subset of these codons. Codons that are most frequently used in a species are called optimal codons, and those that are not used very often are classified as rare or little-used codons. Zhang et al (1991), Gene 105: 61-72. Codons can be substituted to reflect a particular host's preferred codon use in a process sometimes referred to as codon optimization. Optimized coding sequences containing codons preferred by a particular prokaryotic or eukaryotic host can be prepared, for example, to increase the translation rate or to produce recombinant RNA transcripts having desired properties (for example, a longer half-life compared to transcripts) produced from a non-optimized sequence).
Any polypeptide can be targeted to a plastid from a cell containing a plastid by incorporating a CTP sequence derived from synthetic Brassica. For example, a polypeptide can be linked to a synthetic Brassica-derived CTP sequence in some embodiments, in order to direct the polypeptide to a plastid in a cell where the bound polypeptide CTP molecule is expressed. In particular embodiments, a polypeptide directed to a plastid by incorporating a synthetic Brassica-derived CTP sequence can, for example, be a polypeptide that is normally expressed in a plastid of a cell where the polypeptide is natively expressed. For example and without limitation, a polypeptide directed to a plastid by incorporating a synthetic Brassica-derived CTP sequence may be a polypeptide involved in herbicide resistance, virus resistance, bacterial pathogen resistance, insect resistance, nematode resistance or fungal resistance. See, for example, U.S. Patent Nos. 5,569,823; 5,304,730; 5,495,071; 6,329,504; and
6,337,431. A polypeptide targeting a plastid by incorporating a CTP sequence derived from synthetic Brassica can be
36/161 alternatively, for example and without limitation, a polypeptide involved in vigor or plant yield (including polypeptides involved in tolerance to extreme temperatures, soil conditions, light levels, water levels and chemical environment) or a polypeptide that can be used as a marker to identify a plant comprising a characteristic of interest (for example, a selectable marker gene product, a polypeptide involved in seed color, etc.).
Non-limiting examples of polypeptides involved in herbicide resistance that can be linked to a synthetic Brassica-derived CTP sequence in some embodiments of the invention include: acetolactase synthase (ALS), mutated ALS and ALS precursors (see, for example, US Patent 5,013,659); EPSPS (see, for example, U.S. Patents 4,971,908 and 6,225,114)) such as EPSPS CP4, EPSPS class III or an EPSPS class IV; enzymes that modify a physiological process that occurs in a plastid, including photosynthesis, and synthesis of fatty acids, amino acids, oils, arotenoids, terpenoids, starch, etc. Other non-limiting examples of polypeptides that can be linked to a synthetic Brassica-derived chloroplast transit peptide in particular embodiments include: zeaxanthin epoxidase, choline monooxygenase, ferroquelatase, omega-3 fatty acid desaturase, glutamine synthetase, starch-modifying enzymes , polypeptides involved in the synthesis of essential amino acids, provitamin A, hormones, Bt toxin proteins, etc. Nucleotide sequences encoding the peptides mentioned above are known in the art and such nucleotide sequences can be operably linked to a nucleotide sequence encoding a synthetic Brassica-derived CTP to be expressed in a polypeptide comprising the polypeptide of interest linked to the Brassica-derived CTP synthetic. In addition, additional nucleotide sequences encoding any of the polypeptides mentioned above can be identified by those of skill in the art (for example, by cloning genes with high homology with other genes encoding the particular polypeptide). Once such a nucleotide sequence has been identified, it is a straightforward process to design
37/161 a nucleotide sequence comprising a synthetic Brassica-derived CTP encoding sequence operably linked to the identified nucleotide sequence, or a sequence encoding an equivalent polypeptide.
V. Expression of polypeptides comprising a chloroplast transit peptide derived from synthetic Brassica
In some embodiments, at least one nucleic acid molecule (s) comprising a nucleotide sequence encoding a polypeptide comprising at least one CTP derived from synthetic Brassica, or functional equivalent thereof, can be introduced into a cell, tissue or organism for expression of the polypeptide in it. In particular embodiments, a nucleic acid molecule may comprise a nucleotide sequence of interest operably linked to a nucleotide sequence encoding a synthetic Brassica-derived CTP. For example, a nucleic acid molecule can comprise a coding sequence encoding a polypeptide comprising at least one CTP derived from synthetic Brassica and at least one additional peptide sequence encoded by a nucleotide sequence of interest. In some embodiments, a nucleic acid molecule of the invention can be introduced into a host cell containing a plastid, tissue or organism (for example, a plant cell, plant tissue and plant), so that a polypeptide can be expressed from of the nucleic acid molecule in the host cell containing a plastid, tissue or organism, where the expressed polypeptide comprises at least one CTP derived from synthetic Brassica and at least one additional peptide sequence encoded by a nucleotide sequence of interest. In certain examples, the CTP derived from synthetic Brassica of such expressed polypeptide can facilitate targeting a portion of the polypeptide comprising at least the additional peptide sequence to a plastid of the host cell, tissue or organism.
In some embodiments, a nucleic acid molecule of the invention can be introduced into a cell containing a plastid via
38/161 any of the methodologies known to those of skill in the art. In particular embodiments, a host cell, tissue or organism can be contacted with a nucleic acid molecule of the invention in order to introduce the nucleic acid molecule into the cell, tissue or organism. In particular embodiments, a cell can be transformed with a nucleic acid molecule of the invention so that the nucleic acid molecule is introduced into the cell, and the nucleic acid molecule is stably integrated into the cell's genome. In some embodiments, a nucleic acid molecule comprising at least one nucleotide sequence encoding a synthetic Brassica-derived CTP operably linked to a nucleotide sequence of interest can be used to transform a cell, for example, a cell containing a plastid (for example, example, a plant cell). In order to initiate or enhance expression, a nucleic acid molecule can comprise one or more regulatory sequences, regulatory sequences that can be operably linked to the nucleotide sequence encoding a polypeptide comprising at least one CTP derived from synthetic Brassica.
A nucleic acid molecule can, for example, be a vector system including, for example, a linear or closed circular plasmid. In particular modalities, the vector can be an expression vector. Nucleic acid sequences of the invention can, for example, be inserted into a vector, so that the nucleic acid sequence is operably linked to one or more regulatory sequences. Many vectors are available for this purpose, and selection of the particular vector may depend, for example, on the size of the nucleic acid to be inserted into the vector and the particular host cell to be transformed with the vector. A vector typically contains several components, the identity of which depends on a function of the vector (for example, DNA amplification and DNA expression) and the particular host cell (s) with which the vector is compatible.
Some embodiments may include a plant transformation vector that comprises a nucleotide sequence comprising at least one of the regulatory sequences described above operably.
39/161 is linked to one or more nucleotide sequence (s) encoding a polypeptide comprising at least one CTP derived from synthetic Brassica. The one or more nucleotide sequences can be expressed, under the control of the regulatory sequence (s), in a plant, tissue or organism cell to produce a polypeptide comprising a synthetic Brassica-derived CTP that directs through minus a portion of the polypeptide to a plastid in the plant, tissue or organism cell.
In some embodiments, a regulatory sequence operably linked to a nucleotide sequence encoding a polypeptide comprising at least one synthetic Brassica-derived CTP may be a promoter sequence that functions in a host cell, such as a bacterial cell where the nucleic acid molecule must be amplified, or a plant cell where the nucleic acid molecule is to be expressed. Promoters suitable for use in nucleic acid molecules of the invention include those that are inducible, viral, synthetic or constitutive, all of which are well known in the art. Non-limiting examples of promoters that may be useful in embodiments of the invention are provided by: U.S. Patent Nos. 6,437,217 (RS81 corn promoter); 5,641,876 (rice actin promoter); 6,426,446 (RS324 corn promoter); 6,429,362 (PR-1 corn promoter); 6,232,526 (A3 promoter for corn); 6,177,611 (constitutive corn promoters); 5,322,938, 5,352,605, 5,359,142 and 5,530,196 (35S promoter); 6,433,252 (L3 corn oleosin promoter); 6,429,357 (promoter of rice actin 2 and intron of rice actin 2); 6,294,714 (light-inducible promoters); 6,140,078 (salt-inducible promoters); 6,252,138 (pathogen-inducible promoters); 6,175,060 (phosphorus-inducible promoters); 6,388,170 (bidirectional promoters); 6,635,806 (gamma-coixin promoter); and U.S. Patent Application Serial No. 09 / 757,089 (corn chloroplast aldolase promoter).
Additional exemplary promoters include the nopaline synthase (NOS) promoter (Ebert et al (1987), Proc. Natl. Acad. Sci. USA 84 (16): 5745: 9); octopine synthase (OCS) promoter (which is loaded in
40/161 Agrobacterium tumefaciens) 'tumor-inducing plasmids', kaolinimovirus promoters such as the 19S cauliflower mosaic virus (CaMV) promoter (Lawton et al. (1987), Plant Mol. Biol. 9: 315-24 ); the 35S promoter (Odell et al. (1985), Nature 313: 810-2; the 35S promoter of scrofulosa mosaic virus 5 (Walker et al. (1987), Proc. Natl. Acad. Sci.
USA 84 (19); 6624-8); the sucrose synthase promoter (Yang and Russell (1990), Proc. Natl. Acad. Sci. USA 87: 4144-8); the promoter of the R gene complex (Chandler et al. (1989), Plant Cell 1: 1175-83); the chlorophyll a / b binding protein gene promoter; CaMV35S (U.S. Patent Nos.
5,322,938; 5,352,605; 5,359,142 and 5,530,196); FMV35S (U.S. Patent Nos.
6,051,753 and 5,378,619); a PC1SV promoter (U.S. Patent No. 5,850,019);
the SCP1 promoter (U.S. Patent No. 6,677,503); and AGRtu.nos promoters (GenBank Access No. V00087; Depicker et al. (1982), J. Mol. Appl. Genet. 1: 561-73; Bevan et al. (1983), Nature 304: 184-7).
In particular embodiments, the nucleic acid molecules of the invention can comprise a tissue-specific promoter. A tissue-specific promoter is a nucleotide sequence that directs a higher level of transcription from an operably linked nucleotide sequence in the tissue to which the promoter is specific, relative to other tissues in the body. Examples of tissue-specific promoters include, without limitation: cell-layer-specific promoters; anther-specific promoters; pollen-specific promoters (see, for example, U.S. Patent No. 7,141,424 and International PCT Publication No. WO 99/042587); specific egg promoters (see, for example,
U.S. Patent No. 2001/047525 A1); specific fruit promoters (see, for example, U.S. Patent Nos. 4,943,674 and 5,753,475); and specific seed promoters (see, for example, U.S. Patent Nos. 5,420,034 and 5,608,152). In some embodiments, a specific developmental stage promoter (for example, an active promoter at a later stage of development) can be used in a composition or method of the invention.
Additional regulatory sequences that may in some instances
41/161 dalities to be operably linked to a nucleic acid molecule include 5 'RTUs located between a promoter sequence and a coding sequence that functions as a leading translation sequence. The leading translation sequence is present in the fully processed mRNA, and can affect primary transcript processing and / or RNA stability. Examples of leading translation sequences include maize and petunia heat shock protein leaders (U.S. Patent No. 5,362,865), plant virus coating protein leaders, plant rubisco leaders and others. See, for example, Turner and Foster (1995), Molecular Biotech. 3 (3): 225-36. Non-limiting examples of 5 'UTRs are provided by: GmHsp (U.S. Patent No. 5,659,122); PhDnak (U.S. Patent No. 5,362,865); AtAntl; TEV (Carrington and Freed (1990), J. Virol. 64: 1590-7); and AGRtunos (GenBank Access No. V00087); and Bevan et al. (1983), Nature 304: 184-7).
Additional regulatory sequences that may in some embodiments be operably linked to a nucleic acid molecule also include 3 'untranslated sequences, 3' transcription termination regions or polyadenylation regions. These are genetic elements located downstream of a nucleotide sequence and include polynucleotides that provide polyadenylation signals and / or other regulatory signals capable of affecting RNA transcription or processing. The polyadenylation signal works in plants to cause the addition of polyadenylation nucleotides to the 3 'end of the mRNA precursor. The polyadenylation sequence can be derived from a variety of plant genes or T-DNA genes. A non-limiting example of a 3 'transcription termination region is the 3' region of nopaline synthase (nos 3 '; Fraley et al. (1983), Proc. Natl Acad. Sci. USA 80: 4803-7). An example of the use of different 3 'untranslated regions is provided in Ingelbrecht et al. (1989), Plant Cell 1: 671-80. Non-limiting examples of polyadenylation signals include one of a RbcS2 gene from Pisum sativum (Ps.RbcS2-E9; Coruzzi et al. (1984), EMBO J. 3: 1671-9) and AGRtu.nos (No. GenBank Access E01312) .
A recombinant nucleic acid molecule or price vector
42/161 This invention may comprise a selectable marker that confers a selectable phenotype on a transformed cell, such as a plant cell. Selectable markers can also be used to select plants or plant cells that comprise the recombinant nucleic acid molecule of the invention. The marker can encode biocide resistance, antibiotic resistance (eg, kanamycin, Geneticin (G418), bleomycin, hygromycin, etc.) or herbicide resistance (eg, glyphosate, etc.). Examples of selectable markers include, but are not limited to: a neo gene that encodes kanamycin resistance and can be selected for use with kanamycin, G418, etc; a pat or bar gene that encodes resistance to bialaphos; a mutant EPSP synthase gene that encodes glyphosate resistance; a nitrilase gene that confers resistance to bromoxynil; a mutant acetolactate synthase (ALS) gene that confers resistance to imidazolinone or sulfonylurea; and a methotrexate-resistant DHFR gene. Multiple selectable markers are available, which confer resistance to ampicillin, bleomycin, chloramphenicol, gentamicin, hygromycin, kanamycin, lincomycin, methotrexate, phosphinothricin, puromycin, spectinomycin, rifampicin, streptomycin and tetracycline and the like. Examples of selectable markers are illustrated in, for example, U.S. Patent Nos. 5,550,318; 5,633,435; 5,780,708 and 6,118,047.
A recombinant nucleic acid molecule or vector of the present invention may also or alternatively include a selectable marker. Selectable markers can be used to monitor expression. Exemplary selectable markers include a βglucuronidase or uidA (GUS) gene that encodes an enzyme for which several chromogenic substrates are known (Jefferson et al. (1987), Plant Mol. Biol. Rep. 5,387,405); a R locus gene, which encodes a product that regulates the production of anthocyanin pigments (red color) in plant tissues (Dellaporta et al. (1988), Molecular cloning of the maize R-nj allele by transposon tagging wit Ac In 18th Stadler Genetics Symposium, P. Gustafson and R. Appels, eds. (New York: Plenum), pp. 263-82); a βlactamase gene (Sutcliffe et al. (1978), Proc. Natl. Acad. Sci. USA 75: 3737-41);
43/161 a gene that encodes an enzyme for which several chromogenic substrates are known (for example, PADAC, a chromogenic cephalosporin); a luciferase gene (Ow et al (1986), Science 234: 856-9); an xylE gene that encodes a catechol dioxigenase that can convert chromogenic catechols (Zukowski et al (1983), Gene 46 (2-3): 247-55): an amylase gene (Ikatu et al (1990) Bio / Technol. 8 : 241-2); a tyrosinase gene that encodes an enzyme capable of oxidizing tyrosine to DOPA and dopaquinone which in turn condenses to melanin (Katz et al. (1983), J. Gen. Microbiol. 129: 2703-14); and a-galactosidase.
Suitable methods for transforming host cells include any method by which DNA can be introduced into a cell, for example and without limitation: through the transformation of protoplasts (see, for example, U.S. Patent 5,508,184); through dissection / inhibition-mediated DNA absorption (see, for example, Potrykus et al. (1985), Mol. Gen. Genet. 199: 183-8); through electroporation (see, for example, U.S. Patent No. 5,384,253); through stirring with silicon carbide fibers (see, for example, U.S. Patents 5,302,523 and 5,464,765); through Agrobacterium-mediated transformation (see, for example, U.S. Patents 5,563,055, 5,591,616, 5,693,512, 5,842,877, 5,981,840 and 6,384,301); and through acceleration of particles coated with DNA (see, for example, U.S. Patents 5,015,580, 5,550,318, 5,538,880, 6,160,208, 6,399,861 and 6,403,865), etc. Through the application of techniques such as these, cells of virtually any species can be stably transformed. In some embodiments, transforming DNA is integrated into the host cell's genome. In the case of multicellular species, transgenic cells can be regenerated in a transgenic organism. Alternatively, transgenic cells may not be able to regenerate for a plant. Any of these techniques can be used to produce a transgenic plant, for example, comprising one or more nucleic acid sequences of the invention in the genome of the transgenic plant.
The most widely used method for introducing an expression vector into plants is based on the natural transformation system
44/161 of Agrobacteríum. A. tumefacíens and A. rhizogenes are pathogenic plant soil bacteria that genetically transform plant cells. Plasmids T, and R, from A. tumefacíens and A. rhizogenes, respectively, carry genes responsible for the genetic transformation of the plant. Ti (tumor-inducing) plasmids contain a large segment, known as T-DNA, which is transferred to transformed plants. Another segment of the T plasmid, the vir region, is responsible for the transfer of T-DNA. The T-DNA region is surrounded by terminal repeats. In some modified binary vectors, the tumor-inducing genes have been deleted, and the functions of the vir region are used to transfer foreign DNA bypassed by the T-DNA edge sequences. The T region can also contain, for example, a selectable marker for efficient recovery of transgenic plants and cells, and a multiple cloning site for insertion of transfer sequences such as CTP-encoding nucleic acid derived from synthetic Brassica.
In this way, in some embodiments, a plant transformation vector can be derived from a T plasmid, from A. tumefacíens (see, for example, US Patent Nos. 4,536,475, 4,693,977, 4,886,937 and 5,501,967 and European Patent EP 0 122 791) or an R plasmid from A. rhizogenes. Additional plant transformation vectors include, for example and without limitation, those described by Herrera-Estrella et al. (1983), Nature 303: 209-13; Bevan et al (1983), Nature 304: 184-7; Klee et al. (1985), Bio / Technol. 3: 637-42; and in European Patent EP 0 120 516, and those derived from any of the above. Another bacterium, such as Sinorhizobium, Rhizobium and Mesorhizobium, which interacts with plants naturally can be modified to mediate gene transfer to several of different plants. These symbiotic bacteria associated with the plant can be made competent for gene transfer by acquiring both a disarmed T plasmid and a suitable binary vector.
After providing exogenous DNA to the recipient cells, transformed cells are generally identified for further culture and plant regeneration. In order to improve the ability to identify cells
45/161 transformed, a person may wish to employ a selectable marker gene or one that can be evaluated, as previously shown, with the vector used to generate the transformant. In the case where a selectable marker is used, transformed cells are identified within the population of potentially transformed cells through exposure of the cells to a selective agent or agents. In the case where a marker that can be evaluated is used, cells can be evaluated for the desired marker gene characteristic.
Cells that survive exposure to the selective agent, or cells that were rated positive in an evaluation assay, can be cultured in a medium that supports plant regeneration. In some embodiments, any suitable plant tissue culture medium (for example, MS and N6 media) can be modified by adding additional substances, such as growth regulators. Tissue can be kept in a basic medium with growth regulators until sufficient tissue is available to begin plant regeneration efforts, or following repeated rounds of manual selection, until the tissue morphology is suitable for regeneration (for example, at least 2 weeks), then transferred to conductive medium for bud formation. Cultures are transferred periodically until sufficient bud formation has occurred. Once the shoots are formed, they are transferred to a conductive medium for root formation. Once sufficient roots have been formed, the plants can be transferred to soil for further growth and maturity.
To confirm the presence of a nucleic acid molecule of interest (for example, a nucleotide sequence encoding a polypeptide comprising at least one CTP derived from synthetic Brassica) in a regenerating plant, a variety of assays can be performed. Such assays include, for example: molecular biological assays, such as Southern and Northern blotting, PCR and nucleic acid sequencing; biochemical assays, such as detecting the presence of a protein product, for example, by immunological means (ELISA and / or
46/161
Western blots) or through enzymatic function; plant part tests, such as leaf or root tests; and analysis of the phenotype of the entire regenerated plant.
For example, integration events can be analyzed by PCR amplification, for example, oligonucleotide primers specific for a nucleotide sequence of interest. PCR genotyping is understood to include, but is not limited to, polymerase chain reaction (PCR) amplification of genomic DNA derived from isolated host plant tissue containing a nucleic acid molecule of interest integrated into the genome, followed by analysis cloning and standard sequence of PCR amplification products. PCR genotyping methods have been well described (see, for example, Rios, G. et al. (2002), Plant. J. 32: 243-53) and can be applied to genomic DNA derived from any plant species (for example , Z. mays or G. max) 15 or tissue type, including cell cultures.
A transgenic plant formed using Agrobacterium-dependent transformation methods typically contains a single recombinant DNA sequence inserted into the chromosome. The single recombinant DNA sequence is referred to as a transgenic event or integration event. Such transgenic plants are heterozygous for the inserted DNA sequence. In some embodiments, a homogeneous transgenic plant with respect to a transgene can be obtained through sexual pairing (self-pollination) of an independent segregating transgenic plant that contains a unique exogenous gene sequence with itself, for example, an F _o plant to produce F _r seed A quarter of the Fi seed produced will be homozygous with respect to the transgene. Germinating Fi seed results in plants that can be tested for heterozygosity, typically using an SNP assay or a thermal amplification assay that allows the distinction between heterozygotes and homozygotes 30 (ie, a zygosity assay).
In particular embodiments, copies of at least one polypeptide comprising at least one CTP derived from synthetic Brassica
47/161 are produced in a plastid-containing cell, into which at least one nucleic acid molecule (s) comprising a nucleotide sequence encoding at least one polypeptide comprising at least one CTP derived from synthetic Brassica has been introduced. Each polypeptide comprising at least one synthetic Brassica-derived CTP can be expressed from multiple nucleic acid sequences introduced in different transformation events or from a single nucleic acid sequence introduced in a single transformation event. In some embodiments, a plurality of such polypeptides are expressed under the control of a single promoter. In other embodiments, a plurality of such polypeptides are expressed under the control of multiple promoters. Single polypeptides can be expressed, which comprise multiple peptide sequences, each of the peptide sequences must be targeted to a plastid.
In addition to the direct transformation of a plant with a recombinant nucleic acid molecule, transgenic plants can be prepared by crossing a first plant having at least one transgenic event with a second plant without such an event. For example, a recombinant nucleic acid molecule comprising a nucleotide sequence encoding a polypeptide comprising at least one synthetic Brassica-derived CTP can be introduced into a first plant lineage that is condescending to transformation, to produce a transgenic, transgenic plant that can be crossed with a second plant lineage to introgress the nucleotide sequence encoding the polypeptide in the second plant lineage.
IV. Planting materials comprising a polypeptide targeted to synthetic chlorica-derived transit chloride peptide
In some embodiments, a plant cell is provided, where the plant cell comprises a nucleotide sequence encoding a polypeptide comprising at least one CTP derived from synthetic Brassica. In particular embodiments, such a plant cell can be produced by transforming a plant cell that is not capable of
48/161 regeneration to produce a plant. In some embodiments, a plant is provided, where the ptanta comprises a plant cell comprising a nucleotide sequence encoding a polypeptide comprising at least one CTP derived from synthetic Brassica. In particular embodiments, such a plant can be produced by transforming a plant tissue or plant cell and regenerating an entire plant. In additional embodiments, such a plant can be obtained from a commercial source or through introgression of a nucleic acid comprising a nucleotide sequence encoding a polypeptide comprising at least one CTP derived from synthetic Brassica in a germplasm. In particular embodiments, such a plant comprises plant cells comprising a nucleotide sequence encoding a polypeptide comprising at least one CTP derived from synthetic Brassica which are not capable of regeneration to produce a plant. Plant materials comprising a plant cell comprising a nucleotide sequence encoding a polypeptide comprising at least one CTP derived from synthetic Brassica are also provided. Such plant material can be obtained from a plant comprising a plant cell.
A transgenic plant, non-regenerable plant cell or plant material comprising a nucleotide sequence encoding a polypeptide comprising at least one CTP derived from synthetic Brassica may in some embodiments exhibit one or more of the following characteristics: expression of the polypeptide in a cell plant; expression of a portion of the polypeptide in a plastid of a plant cell; import of the polypeptide from the cytosol of a plant cell to the cell's plastid; specific plastid expression of the polypeptide in a plant cell; and / or location of the polypeptide in a plant cell. Such a plant may also have one or more desirable characteristics other than expression of the encoded polypeptide. Such characteristics may include, for example: resistance to insects, other pests and disease-causing agents; herbicide tolerances; increased stability, performance or shelf life; environmental tolerances; pharmaceutical production; production of industrial product; and nutritional improvements.
A transgenic plant according to the invention can be any plant capable of being transformed with a nucleic acid molecule of the invention. In this way, the plant can be a dicot or monocot. Non-limiting examples of dicotyledonous plants useful in the present methods include Arabidopsis, alfalfa, beans, broccoli, cabbage, carrots, cauliflower, celery, Chinese cabbage, cotton, cucumber, eggplant, lettuce, melon, peas, pepper, peanuts, potatoes, pumpkin, radish, rapeseed, spinach, soy, pumpkin, beet, sunflower, tobacco, tomato and watermelon. Non-limiting examples of monocot plants useful in the present methods include corn, brassica, onion, rice, sorghum, wheat, barley, corn, sugar cane, oats, triticale, switchgrass and turfgrass grasses. Transgenic plants according to the invention can be used or grown in any way.
Some embodiments also provide consumer products containing one or more nucleotide sequences encoding a polypeptide comprising at least one CTP derived from synthetic Brassica, for example, a consumer product produced from a recombinant plant or seed containing one or more of such sequences nucleotide. Consumer products containing one or more nucleotide sequences encoding a polypeptide comprising at least one CTP derived from synthetic Brassica include, for example and without limitation: food products, flours, crushed or whole oils or grains or seeds of a plant comprising one or more nucleotide sequences encoding a polypeptide comprising at least one CTP derived from synthetic Brassica. The detection of one or more nucleotide sequences encoding a polypeptide comprising at least one CTP derived from synthetic Brassica in one or more crude products or consumer products is evidence of fact that the crude product or consumer product was at least in part produced at from a plant comprising one or more nucleotide sequences encoding a polypeptide comprising at least one CTP derived from synthetic Brassica. In pair modes
50/161 particulars, a consumer product of the invention comprises a detectable amount of a nucleic acid sequence encoding a polypeptide comprising at least one CTP derived from synthetic Brassica. In some modalities, such consumer products can be produced, for example, by obtaining transgenic plants and preparing food or feed from them.
In some embodiments, a transgenic plant, a non-regenerable plant cell or seed comprising a transgene comprising a nucleotide sequence encoding a polypeptide comprising at least one CTP derivative derived from synthetic Brassica may also comprise at least one other transgenic event in its genome, including, without limitation: a transgenic event from which an iRNA molecule is transcribed; a gene encoding an insecticidal protein (for example, an insecticidal protein Bacillus thuringiensis) ', a herbicide tolerance gene (for example, a gene providing glyphosate tolerance); and a gene contributing to a desirable phenotype in the transgenic plant (for example, increased yield, altered fatty acid metabolism or restoration of cytoplasmic male sterility).
VII. Localization of gene products for plastids mediated by chloroplast transit peptide derived from synthetic Brassica
Some embodiments of the present invention provide a method for expression and / or localization of a gene product for a plastid (for example, a chloroplast). In particular embodiments, the gene product can be a marker gene product, for example, a fluorescent molecule. Expression of the gene product as part of a polypeptide also comprising a synthetic Brassica-derived CTP can provide a system for assessing the plastid localization capabilities of a particular synthetic Brassica-derived CTP sequence. In some embodiments, expression of a marker gene product as part of a polypeptide containing synthetic Brassica-derived CTP is used to direct expression of the marker gene product to a plastid of a cell where the polypeptide is expressed. In certain modalities, such
51/161 marker gene product is located in plastid (s) of the host cell. For example, the marker gene product can be expressed at higher levels in the plastid (s) than in the cytosol or other host cell organelles; the marker gene product can be expressed at much higher levels in the plastid (s); the marker gene product can be expressed essentially only in the plastid (s); or the marker gene product can be fully expressed in the plastid (s), so that expression in the cytosol or non-plastid organelles cannot be detected.
In some embodiments, a polypeptide comprising a functional variant of a synthetic Brassica-derived CTP, where the polypeptide that is operably linked to a marker gene product is used to evaluate the characteristics of the functional variant peptide. For example, the sequence of a synthetic Brassica-derived CTP can be varied, for example, by introducing at least one conservative mutation (s) into the synthetic Brassica-derived CTP, and the resulting variant peptide can be linked to a marker gene product. After expression in a suitable host cell (for example, a cell where one or more regulatory elements in the expression construct are operable), expression of the marker gene product can be determined. By comparing the subcellular location of the marker gene product between the CTP construct derived from synthetic Brassica-reference marker and the variant marker peptide construct, it can be determined whether the variant peptide provides, for example, greater plastid location, or substantially plastid location identical. Such a variant can be considered a functional variant. By identifying functional variants of CTP derived from synthetic Brassica that provide a larger plastid location, mutations in such variants can be incorporated into additional variants of CTPs derived from synthetic Brassica. Carrying out multiple rounds of this evaluation process, and subsequently incorporating favorable mutations identified in a CTP sequence derived from synthetic Brassica, can yield an iterative process for optimization of a CTP sequence derived from synthetic Brassica. Such optimized synthetic Brassica-derived CTP sequences, and nucleotide sequences encoding them, are considered part of the present invention, whether or not such optimized synthetic Brassica-derived CTP sequences may be further optimized by further mutation.
All references, including publications, patents and patent applications, cited here are hereby incorporated by reference to the extent that they are not inconsistent with the explicit details of the present invention, and are also incorporated to the same extent as if each reference was individually and specifically indicated to be incorporated by reference and to be shown in its entirety here. The references discussed here are provided for description only prior to the filing date of this application. Nothing here should be considered as an admission that inventors have no right to predate such a description by virtue of a previous invention.
The Examples that follow are provided to illustrate certain characteristics and / or particular aspects. These examples should not be considered to limit the description to the particular characteristics or aspects described.
EXAMPLES
Example 1: Design and Production of Chloric Chloroplast Transit Peptide (TraP) Sequences
Plastids are cytoplasmic organelles found in higher plant species and are present in all plant tissues. Chloroplasts are a specific type of plastid found in green photosynthetic tissues that are responsible for essential physiological functions. For example, one such primary physiological function is the synthesis of aromatic amino acids required by the plant. Nuclear encoded enzymes are required in this biosynthetic course and are transported from the cytoplasm into the chloroplast. These nuclear encoded enzymes generally have an N-terminal transit peptide that interacts with the chloroplast membrane to facilitate transport of the peptide to the chloroplast stroma. Bruce. B (2000) Chloroplast transit peptides: structure, function and
53/161 evolution. Trends Cell Biol. 10: 440-447. Upon importation, stromal peptidases cleave the transit peptide, leaving the imported mature protein within the chloroplast. Richter, S., Lamppa GK (1999) Stromal processing peptidase binds transit peptides and initiates their ATPdependent turnover in chloroplasts. Journ. Cell. Bio. 147: 33-43. Chloroplast transit peptides are variable sequences that are highly divergent in length, composition and organization. Bruce B. (2000) Chloroplast transit peptides: structures, function and evolution. Trends Cell Biol. 10: 440-447. The sequence similarities of chloroplast transit peptides diverge significantly between homologous proteins of different plant species. The amount of divergence between chloroplast transit peptides is unexpected given that homologous proteins obtained from different plant species typically share relatively high levels of sequence similarity when comparing the processed mature functional protein.
New chimeric chloroplast transit peptide sequences were designed, produced and tested in planta. The new chimeric chloroplast transit peptides have been shown to have effective translocating and processing properties for importing important agronomic proteins into the chloroplast. Initially, native 5-enolpyruvylchiquimate-3-phosphate synthase (EPSPS) protein sequences from different plant species were analyzed using the Chloro® computer program to identify putative chloroplast transit peptide sequences (Emanuelsson, O., Nielsen, H ., von Heijne, G., (1999) ChloroP, a neural network-based method for predicting chloroplast transit peptides and their cleavage sites, Protein Science 8; 978-984), available at http: //www.cbs.dtu. dk / services / ChloroP /. After the native chloroplast transit peptides were identified, a first chloroplast transit peptide sequence was aligned with a second chloroplast transit peptide sequence from a second organism. Figure 18 illustrates the alignment of the EPSPS chloroplast transit peptide sequences of Brassica napus (NCBI Accession No.: P17688) and Brassica rapa
54/161 (NCBI Accession No.: AAS80163). Using the chloroplast transit peptide sequence alignment, new chimeric chloroplast transit peptides have been designed by combining the first half of the first organism's chloroplast transit peptide sequence with the second half of the second chloroplast transit peptide sequence. organism in an approximate 1: 1 ratio. Exemplary sequences of the newly designed chimeric chloroplast transit peptides are TraP8 (SEQ ID NO: 3) and TraP9 (SEQ ID NO: 4). These new chimeric chloroplast transit peptide sequences are derived from the EPSPS proteins of Brassica napus [No. ATCC access: P17688] and Brassica rapa [No. ATCC Access: AAS80163]. The chimeric chloroplast transit peptide sequence TraP8 (SEQ ID NO: 3) comprises an N-terminus that is derived from Brassica napus and the C-terminus of the chloroplast transit peptide is derived from Brassica rapa. The TraP chloroplast transit peptide sequence (SEQ ID NO: 4) comprises an N-terminus that is derived from Brassica rapa and the C-terminus of the chloroplast transit peptide is derived from Brassica napus. Chimeric chloroplast transit peptides were tested by multiple assays that included a transient and transgenically in-plant expression system as a stable transformation event comprising a gene expression element fused to an important agronomic transgene sequence.
Example 2: Transient In-Plant Chimeric Chloroplast Transit Peptide (TraP) Sequence Test
Transient Tobacco Assay:
The chimeric chloroplast transit peptide sequences TraP8 and Trap9 were initially tested using a transient in-plant assay. Polynucleotide sequences encoding the chloroplast transit peptide sequences TraP8 (SEQ ID NO: 5) and TraP9 (SEQ ID NO: 6) were synthesized. A linker sequence (SEQ ID NO: 7) was incorporated between the TraP sequence and the yfp coding sequence. The resulting constructs contained two plant transcription units (PTU). The first PTU comprised of the promoter 10 of Ubiquitina de Ara
55/161 bidopsis thaliana (AtUbi 10 promoter; Callis et al. (1990) J. Biol. Chem., 265: 12486-12493), yellow fluorescent TraP-protein fusion gene (TraP-YFP; US Patent Application 2007 / 0298412) and untranslated 3 'ORF 23 region of Agrobacterium tumefaciens (AtuORF23 3'UTR; US Patent No. 5,428,147). The second PTU was comprised of the cassava nerve mosaic virus promoter (CsVMV promoter; Verdaguer et al. (1996) Plant Molecular Biology, 31: 1129-1139), fosfinotricin acetyl transferase (PAT; Wohlleben et al. (1988) Gene, 70: 25-37) and the untranslated 3 'ORF 1 region of Agrobacterium tumefaciens (AtuORFI 3'UTR; Huang et al (1990), J. Bacteriol., 172: 1814-1822). The construct pDAB101977 contains the chimeric chloroplast transit peptide Trap8 (Figure 2). The construct pDAB101978 contains the chimeric chloroplast transit peptide TraP9 (Figure 3). A control plasmid, 101908, which did not contain a chloroplast transit peptide sequence upstream of the yfp gene was constructed and included in the studies (Figure 4). The constructs were confirmed through digestion and restriction enzyme sequencing. Finally, the constructs were transformed into Agrobacterium tumefaciens and stored as glycerol stocks.
From an Agrobacterium glycerol stock, a loop filled with frozen culture was inoculated in 2 ml of YPD (100 pg / ml spectinomycin) in a sterile 14 ml tube. The inoculated medium was incubated at 28 ° C overnight with shaking at 220 rpm. The next day, about 100 µl of the culture was used to inoculate 25 ml of YPD (100 µg / ml spectinomycin) in a flask with three recesses in the 125 ml sterile bottom and incubated overnight at 28 ° C with stirring at 200 rpm. The next day, the cultures were diluted to an OD ₆ o of 0.5 in sterile ddH ₂ O (pH 8.0). The diluted Agrobacterium strain was mixed with a second Agrobacterium strain containing the auxiliary protein P19 in a 1: 1 ratio. The culture was used to infiltrate the tobacco leaf using the method of Voinnet, O., Rivas, S., Mestre, P. and Baulcombe, D. (2003). An enhanced transient expression. system in plants based on supression of gene silencing by the p19 protein of tomato bushy stunt virus, The Plant
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Journal, 33: 949-956. Infiltrated tobacco plants were placed in a Conviron® set at 16 h of light at 24 ° C for at least three days until tested.
Microscopy Results:
Tobacco leaves infiltrated with Agrobacterium were removed from the plant and placed in a petri dish with water to prevent dehydration. The infiltrated tobacco leaves were observed under blue light excitation with long-pass filter glasses held in place using a Dark Reader Hand Lamp® (Clare Chemical Research Co .; Dolores, CO) to identify undamaged areas of the leaf they were expressing successfully reporter YFP proteins. Specifically identified leaf areas were dissected from the leaf and mounted in water for imaging using confocal microscopy (Leica TCS-SP5 AOBS®; Buffalo Grove, IL). The YFP reporter protein was excited by a 514 nm laser line, using a multiline argon ion laser. The width of the detection slits was adjusted using a non-expression control sheet sample (dark) to exclude base sheet autofluorescence. Chlorophyll autofluorescence was simultaneously collected in a second channel for direct comparison with the fluorescent reporter protein signal to determine chloroplastic location.
The results of microscopic imaging indicated that the fluorescent YFP protein comprising a chloroplast transit peptide TraP8 or Trap9 accumulated within the chloroplasts located in the cytoplasm of tobacco cells compared to the fluorescent YFP control proteins that did not translocate to the chloroplasts of the cytoplasm of the cells tobacco (Figure 5 and Figure 6). These microscopic imaging results suggest that the translocation of the YFP protein into the chloroplast was a result of the chloroplast transit peptide TraP8 or TraP9. As shown in Figure 5 and Figure 6, the YFP fluorescence signal is located in chloroplasts that also fluoresce red due to autofluorescence under microscopic imaging conditions. Comparatively, Figure 7 provides a microscopic image of tobacco leaf tissues
57/161 infiltrated with the control construct pDAB101908 that does not contain a chloroplast transit peptide. The chloroplasts in this image only fluoresced red due to autofluorescence under microscopic imaging conditions, and are devoid of any YFP fluorescence signal that is displayed on tobacco cells infiltrated with TraP. Instead, the YFP fluorescence signal in the control tobacco plant cells is expressed diffusely in the cytoplasm of the tobacco plant cells. Western Blot results:
Samples of the infiltrated tobacco plants were tested using Western blotting. Leaf punctures were collected and submitted to bed crushing. About 100-200 mg of leaf material was mixed with 2 BBs (steel balls) (Daisy; Rogers, AR) and 500 ml of PBST for 3 minutes in a Kleco® ball grinder. The samples were then spun in a centrifuge at 14,000 xga 4 ^o C. The supernatant was removed and either analyzed directly by Western blot or immunoprecipitate. Immunoprecipitations were performed using the Pierce Direct IP kit® (Thermo Scientific; Rockford, IL) following the manufacturer's protocol. Approximately 50 µl of anti-YFP was attached to the resin. The samples were incubated with the resin overnight at 4 ^o C. Then, the samples were washed and eluted the next morning and prepared for analysis by combining equal volumes of 2X 8M Urea sample buffer and then boiling samples for 5 minutes. The boiled samples were activated in a 4-12% Tris gel SDS-Bis in MOPS buffer for 40 minutes. The gel was then blotted using Invitrogen iBlot® (Life Technologies; Carlsbac, CA) following the manufacturer's protocol. The blotting membrane was blocked for 10 minutes using 5% skimmed-milk powder in PBS-Tween solution. The membrane was probed with the primary antibody (anti-monoclonal GFP in rabbit) used at a 1: 1000 dilution in 5% skimmed-milk powder in PBS-Tween solution for 1 hour. Then, the membrane was rinsed three times for five minutes with PBS-Tween to remove all unbound primary antibody. The membrane was probed with a secondary monoclonal anti-rabbit in goat antibody (Life Technologies)
58/161 used in a 1: 1000 dilution, for 60 minutes. The membrane was washed as previously described and developed through the addition of Themo BCIP / NBT substrate. The colorimetric substrate was allowed to develop for 510 minutes and then the blots were rinsed with water before being dried.
Western blot results indicated that the YFP protein was expressed in the infiltrated tobacco cells. Both tobacco plant leaf tissues infiltrated with pDAB101977 and pDAB101978 expressed the YFP protein as indicated by the presence of a protein strand that reacted to the YFP antibodies and was equivalent in size to the YFP protein strip obtained from leaf tissue. tobacco plant infiltrated with the YFP control construct. In addition, these results indicated that the chimeric Chloroplast transit peptides TraP were processed and cleaved from the YFP protein. The TraP8-YFP and TraP9-YFP constructs express a pre-processed protein range that is higher in molecular weight than the control YFP protein. The presence of bands on the Western blot that were equivalent in size to the control YFP indicates that the chloroplast transit peptide sequences TraP8 and TraP9 were processed, thereby reducing the size of the YFP to a molecular weight size that is equivalent to the control of YFP.
Transient Corn Protoplasty Assay:
The polynucleotide sequence encoding chimeric chloroplast transit peptide TraP8 (SEQ ID NO: 5) and the ligand encoding polynucleotide sequence (SEQ ID NO: 7) were cloned upstream of the fluorescent yellow protein gene and incorporated into the pDAB construct 106597 (Figure 8) for testing by transient in-plant testing of corn protoplasts. The resulting constructs contained a single plant transcription unit (PTU). PTU was understood to be a promoter of Ubiquitin 1 by Zea Mays (ZmUbil promoter; Christensen, A., Sharrock, R. and Quail, P., (1992) Maize polybiquitin genes: structure, thermal pertubation of expression and transcript splicing, and promoter activity following transfer to protoplast by electroporation, Plant Molecular Biology, 18: 675-689), gene
59/161 TraP-fluorescent yellow protein fusion (TraP8-YFP; U.S. Patent Application 2007/0298412) and 3 'untranslated region of Zea Mays Peroxidase 5 (ZmPer5 3' UTR; U.S. Patent No. 6384207). The constructs were confirmed through digestion and restriction enzyme sequencing.
Seed of Zea mays var. B104 were sterilized on the surface, shaking vigorously in Clorox 50% (sodium hypochlorite 3%), containing 2-3 drops of Tween 20, for about 20 minutes. The seeds were rinsed completely with sterile distilled water. The sterile seed was plated in MS% media in Phytatrays or similar type boxes and allowed to grow in the dark (28 ° C) for 12 to 20 days. A transient corn protoplasty assay was used to obtain and transfect corn protoplasts from B104-corn leaves. This corn protoplasty assay is a modification of the system described by Yoo, S.D., Cho, Y.H. and Sheen, J., (2007), Arabidopsis Mesophyll Protoplasts: A Versitile Cell System for Transient Gene Expression Analysis, Nature Protocols, 2: 1565-1572. The solutions were prepared as described by Yoo and others (2007), with the exception that the concentration of mannitol used for the following experiments was changed to 0.6 M.
Transfection of 100 to 500 pl of protoplasts (1-5x10 ⁵ ) was completed by adding the protoplasts to a 2 ml microfuge tube containing about 40 pg of plasmid DNA (pDAB 106597), at room temperature. The volume of DNA was preferably maintained at about 10% of the volume of protoplasts. The protoplasts and DNA were occasionally mixed during an incubation period of 5 minutes. An equal volume of PEG solution was slowly added to the protoplasts and DNA, 2 drops at a time with mixing between adding the drops of PEG solution. The tubes were allowed to incubate for about 10 minutes with occasional gentle mixing. Then, 1 ml of W5 + solution was added and mixed by inverting the tube several times. The tube (s) were (were) centrifuged for 5 minutes at 75 xg at a temperature of 4 ^o C. Finally, the supernatant was removed and the pellet was resuspended in 1 ml of Wl solution and the protoplasts were placed in a small Petri dish (35 x 10 mm) or
60/161 in 6-well multi-well plates and incubated overnight in the dark at room temperature. YFP fluorescence was seen through microscopy after 12 hours of incubation. The microscopy conditions previously described were used for the image.
The results of microscopic imaging indicated that the fluorescent YFP protein comprising a chimeric chloroplast transit peptide TraP8 accumulated within the chloroplasts located in the cytoplasm of corn cells compared to the fluorescent YFP control proteins that did not translocate to the chloroplasts of the cytoplasm of the corn cells. corn (Figure 9). These microscopic imaging results suggest that the translocation of the YFP protein to the chloroplast was a result of the chimeric chloroplast transit peptide TraP8.
Example 3: Chimeric Chloroplast Transit Peptide (TraP) Sequences for Expression of Achonomically Important Transactions in Arabidopsis
A single amino acid mutation (G96A) in the enzyme 5enolpyruvylchiquime 3-phosphate synthase (EPSP synthase) of Escherichia coli can result in glyphosate insensitivity (Padgette et al (1991); Eschenburg et al (2002); Priestman et al (2005); Haghani et al. (2008)). Although this mutation confers tolerance to glyphosate, it is also known to adversely affect the binding of EPSP synthase with its natural substrate, phosphoenolpyruvate (PEP). The resulting change in substrate binding efficiency may render a mutated enzyme unsuitable for in-plant glyphosate tolerance provision.
The Genbank NCBI database was evaluated in silico for EPSP synthase protein and polynucleotide sequences that naturally contain an alanine in a similar position within the EPSP synthase enzyme than that of the G96A mutation that was introduced in the E. coli version of the enzyme ( Padgette et al. (1991); Eschenburg et al. (2002); Priestman et al. (2005); Haghani et al. (2008)).
An enzyme that has been identified to contain a natural alanine in this position was DGT-28 (NO. AC. GENBANK: ZP_06917240.1) from Streptomy
61/161 sviceus dogs ATCC29083. Exploration of additional in silico data revealed three other unique Streptomyces enzymes with greater homology to DGT-28; DGT-31 (NO. AC. GENBANK: YP 004922608.1); DGT-32 (NO. AC. GENBANK: ZP_04696613); and DGT-33 (NO. AC. GENBANK: NC_010572). Each of these enzymes contains a natural alanine in a similar position within the EPSP synthase enzyme than that of the G96A mutation that was introduced in the E. coli version of the enzyme. Figure 1.
Because EPSP synthase proteins from different organisms are of different lengths, the mutation numbering for the E. coli version of the EPSP synthase enzyme does not necessarily correspond with the mutation numbering for the EPSP synthase enzymes of the other organisms. These identified EPSP synthase enzymes have not been previously characterized with respect to glyphosate tolerance or PEP substrate affinity. In addition, these EPSP synthase enzymes represent a new class of EPSP synthase enzymes and do not contain any sequence motifs that have been used to characterize Class I EPSP synthase enzymes (plant-derived sequences described in US Patent No. RE39247), II (sequences bacterially derived described further in US Patent No. RE39247) and III (bacterially derived sequences further described in International Patent Application WO 2006/110586) previously described.
The new DGT-14, DGT-28, DGT-31, DGT-32 and DGT-33 enzymes were characterized for glyphosate tolerance and affinity with the PEP substrate through comparison with Class I EPSP synthase enzymes. Class I enzymes that follow; DGT-1 from Glycine max; DGT-3 from Brassica napus (NO. AC. GENBANK: P17688) and DGT-7 from Triticum aestivum (NO. AC. GENBANK: EU977181) were for comparison. The EPSP synthase Class I enzymes and their mutant variants were synthesized and evaluated. A mutation introduced in the plant EPSP synthase enzymes consisted of the Glycine to Alanine mutation made within the EPSP synthase enzyme at a site similar to that of the G96A mutation of the E. coli version of the enzyme. Still, threonine to isoleucine and proline to serine mutations were intro
62/161 in these enzymes EPSP synthase Ciasse I in positions analogous to those of amino acid 97 (T to I) and amino acid 101 (Pa S) in EPSP synthase of E. coli as described in Funke et al. (2009).
DGT14:
Transgenic Arabidopsis plants containing the chimeric chloroplast transit peptides TraP8 and TraP9 fused to the dgM4 transgene were produced using the floral diving method of Clough and Bent (1998), Plant J. 16: 735-743. Transgenic Arabidopsis plants were obtained and confirmed to contain the transgene through molecular confirmation. The transgenic plants were sprayed with different rates of glyphosate. A distribution of varying concentrations of glyphosate rates, including high rates, was applied in this study to determine the relative levels of resistance (105, 420, 1,680 or 3,360 g ae / ha). The typical glyphosate 1X field usage rate is 1,120 g ae / ha. The Arabidopsis Τ _Ί plants that were used in this study were variable in copy number for the dgrt-14 transgene. The low copy Arabidopsis dgt-14 plants were identified using molecular confirmation and self-pollinated assays and used to produce T ₂ plants. Table 1 shows the resistance for dgt-14 transgenic plants, compared to control plants comprising a glyphosate herbicide resistance gene, dgt-1 (as described in US Patent Application No. 12558351, incorporated herein by reference in its entirety) ) and wild-type controls.
Arabidopsis Τ _Ί transformants were first selected from the base of _{untransformed} seed using a glufosinate selection scheme. Three trays, or 30,000 seeds, were analyzed for each T construct. The selected T-ι plants were molecularly characterized and the plants were subsequently transplanted into individual pots and sprayed with various rates of commercial glyphosate as previously described. The response dose of these plants is presented in terms of% visual damage 2 weeks after treatment (WAT) (Weeks After Treatment). Data are presented in the tables below showing individual plants showing little or no injury (<20%), moderate injury
63/161 rada (20-40%) or severe injury (> 40%). An arithmetic mean and standard deviation are presented for each construct used for the transformation of Arabidopsis. The range in individual response is also indicated in the last column for each rate and transformation. Untransformed, wild-type Arabidopsis (c.v. Columbia) served as a glyphosate-sensitive control.
The level of plant response varied in Arabidopsis Ti plants. This variance can be attributed to the fact that each plant represents an independent transformation event and therefore the copy number of the gene of interest varies from plant to plant. An average general population lesion by rate is shown in Table 1 to demonstrate the tolerance provided by each of the dgf-14 constructs linked to or with chloroplast transit peptide TraP8 v2 or TraP9 v2 versus dgt-1 and wild-type controls unprocessed for varying rates of glyphosate. The events contained dgt-14 linked with TraP8 v2 (SEQ ID NO: 8) which is contained in the pDAB105526 construct (Figure 10) and TraP9 v2 (SEQ ID NO: 9) which is contained in the pDAB105527 construct (Figure 11). Data from the selection of Ti plant glyphosate demonstrated that when dgt-14 was linked with these chloroplast transit peptides, robust tolerance to high glyphosate levels was provided. Comparatively, untransformed (or wild-type) controls did not provide tolerance to the treatment of high concentrations of glyphosate when treated with similar rates of glyphosate. In addition, there were cases when events that were shown to contain three or more copies of dgt-14 were more susceptible to high glyphosate rates. These cases are demonstrated within the range of visual injury shown in Table 1. It is likely that the presence of high copy numbers of transgenes within Arabidopsis plants will result in silencing of transgene or other epigenetic effects that resulted in sensitivity to glyphosate, despite the presence of the dgt-14 transgene.
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Table 1. Response of Arabidopsis T ^ _ transformed with dqt-14 to a range of rates of glyphosate applied post-emergence, compared with a population of segregation of dqt-1 (T ) And an untransformed control. % Visual injury 2 weeks after application .____________________________________________________________________________
% Injury Analysis Deviation for Range (%) standard O 20-50 | 0-70 25-85 the CD1O O o X—X— 31.5 28.4 CO c T Average 0.0 40.0 23.8 66.3 ΙΩ cd CM and Replicas) > 40% O CM x— CO - % Injury Range (No. d 20-40% O CM O X * " O o ^ O CM VO CO O CO CO CM m m om<QMX—-PCM>CO CL051— h- Application Fee 0 g ae / ha glyphosate 105 g ae / ha glyphosate 420 g ae / ha glyphosate 1680 g ae / ha glyphosate o + - »05 tn £CD05 JZ ~ φfrogO)o CO CO CO
the iCÜ ω φ _ιΦ σφ φτη cz < Range (%) O 0-50 the r-1st 15-85 5-85 Standard deviation 0.0 25.7 37.7 39.0 39.2 Average the o 23.0 37.5 CO oo m- 63.8 05η 05 ο ο. 'φ CLφό Ζο> 05 ω φ —IΦ σ05 X05 υ_θ '* > 40% O x— CM CM CO 20-40% O - O O O <20% M CM CM CM - rT CM m ΙΟ Οm <Qμ-X— a, α>73CM> σ> CLro k— I- Application Fee O-4— »OS ω oÕ505 JZΦ05σ>O 105 g ae / ha glyphosate O - + ->05 ω o M— ~ Õ)05 JZ ~ φ05CDThe CM m · O- + - '05 Φ O μ—O)05 JZ ~ φ05σ>ο 00 CO x— 3360 g ae / ha glyphosate
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% Injury Analysis Range (%) O 14.1 S 30-60 0 CO 40-100 45-65Standard deviation 0.0 00 30.0 rco Average the o 40.0 30.0 55.0 57.5 % Injury Range (No. of Replies) > 40% O - 0 - 'T20-40% O COCO 0 <20% ^ t O 0 0 0 dgt-1 (pDAB3759) Application Fee o -4— <ro ω o ^ 33 Hiro -CAssCDO the -4— *ro ω o0505 JCΦ 05CDLO O 420 g ae / ha glyphosate 1680 g ae / ha glyphosate 3360 g ae / ha glyphosate
% Injury Analysis Range (%) 0 100 100 100 100Standard deviation 00 ' 0.0 0.0 0.0 0.0 AverageI 0'0 000 00 '0 100.0 00 '0 % Injury Range (No. of Replies) > 40% 0st st20-40% 0 0 0 0 0 <20%0 0 0 0 Untransformed control | Application Fee 0 g ae / ha glyphosate 105 g ae / ha glyphosate 420 g ae / ha glyphosate 1680 g ae / ha glyphosate 3360 g ae / ha glyphosate
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Selected Arabidopsis plants that were identified to contain low copy numbers of transgene inserts (1-3 copies) were self-fertilized to produce a second generation for further evaluation of glyphosate tolerance. Second-generation Arabidopsis (T ₂ ) plants that contained 1-3 copies of the dgt-14 transgene fused to the chimeric chloroplast transit peptides TraP8 and TraP9 were further characterized for glyphosate tolerance and glufosinate tolerance (glufosinate resistance indicated that the PAT expression cassette was intact and did not undergo rearrangements during the self-pollination of Ti plants). In generation T ₂ hemizygous and homozygous plants were available for testing for each event and were then included for each rate of glyphosate tested. Hemizigote plants contained two different alleles at one locus compared as compared to homozygous plants that contained the same two alleles at one locus. The copy number and ploid levels of the T ₂ plants were confirmed using molecular analysis protocols. Likewise, glyphosate was applied using the methods and rates as previously described. The response dose of the plants is shown in terms of visual damage% 2 weeks after treatment (WAT). The data are presented as a histogram of individuals exhibiting little or no injury (<20%), moderate injury (20-40%) or severe injury (> 40%). An arithmetic mean and standard deviation are presented for each construct used for the transformation of Arabidopsis. The range in individual response is also indicated in the last column for each transformation rate. Untransformed, wild-type Arabidopsis (cv. Columbia) served as a glyphosate-sensitive control. In addition, plants comprising a glyphosate herbicide resistance gene, dgt-1 (as described in US Patent Filing No. 12558351, incorporated herein by reference in its entirety) were included as a positive control.
In the _T 2 generation, both single copy and low copy dgt-14 events (two or three copies) were characterized for glyphosate tolerance. An average of general population injury per rate is shown in Table 2 to demonstrate the tolerance provided by each of the constructs
67/161 dgt-14 linked with a chloroplast transit peptide versus dgt-1 and untransformed wild-type controls for varying rates of glyphosate. Generation T ₂ events contained dgt-14 linked with TraP8 v2 (pDAB105526) and TraP9 v2 (pDAB105527). Both events are highly resistant to glyphosate. The results indicated that the lesion range for Arabidopsis T ₂ plants was less than 20% for all glyphosate concentrations that were tested. Comparatively, untransformed (or wild type) controls did not provide tolerance to the treatment of high glyphosate concentrations when treated with similar rates of 10 glyphosate. Overall, the results showed that plants containing and expressing DGT-14 fused to the chimeric transit peptide proteins TraP8 and TraP9 provided commercial level resistance to glyphosate at levels up to 3 times the field rate (1120 g ae / ha).
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Table 2. Arabidopsis T response transformed with dgt-14 for a range of post-emergence applied glyphosate rates, compared with a segregation population of dqt-1 (T2) and an untransformed control. % Visual injury 2 weeks after application. The data represent a single copy lineage selected from each construct that segregated as a single locus in the inheritance capacity assessment ._________________________ o 105 cd Φ —I (D 73
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% Injury Analysis Range (%) O 5-75 20-75 20-70 35% Injury Analysis Range (%) O o o x— f O: O o _: O r— x— i L. ¹ 100 Standard deviation the o 40.4 31.8 23.9 0'0 Standard deviation 0Ό OO the o 0'0 0.0 Average 0.0 40.0 47.5 41.3 35.0 Average 0.0 o o o 100.0 100.0 100.0 and Replicas) > 40% O CM CM CM O ie Replicas) OΛ O -st st % Injury Range (No. d 20-40% O O CM CM% Injury Range (No. d 20-40% O O O O O <20%CM O O O <20%O O O Oi dgt-1 (pDAB3759) Application Fee O4— »ro to oCD05 JCΦ05CDO O 05 to Td 05 Ίΰ 05 CD O CM Μ ^- O -*-"05 w Oõo05Φ05CDOCO O - + - ·05 to o15)05 .C ~ Φ05CDO00 CO 3360 g ae / ha glyphosateUntransformed control Application Fee 0 g ae / ha glyphosate O05 to o ^ + - 55)05JZ~ Φ05CDThe CM O-4— *05 to O~ Õ)05 -C ~ φ05CDThe CO xf 1680 g ae / ha glyphosate 3360 g ae / ha glyphosate
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Randomly selected Arabidopsis T ₂ plants that were identified to contain low copy numbers of transgenic inserts (1-3 copies) were self-fertilized to produce a third generation for further evaluation of glyphosate tolerance. Arabidopsis seeds of the third generation (T ₃ ) were planted and evaluated for tolerance to glyphosate using the same protocols previously described. The events tested in the T ₃ generation contained replicates of each line that were homozygous (as determined by using a glufosinate resistance assessment to identify whether any of the advanced plants showed segregation of the transgenes). These Events were tested using LC-MS-MS to confirm that the plants expressed the DGT-14 protein. The results of the generation T ₃ for the average injury of the general population by the glyphosate rate are shown in Table 3 which shows the tolerance to glyphosate provided by each of the dgt-14 constructs for varying rates of glyphosate. Exemplary resistant T ₃ events comprised dgt-14 linked with TraP8 v2 (pDAB105526) and TraP9 v2 (pDAB105527). Both of these events were highly resistant to glyphosate. The results indicated that the lesion range for Arabidopsis T ₃ plants was less than 20% for all concentrations of glyphosate that were tested. In comparison, untransformed (or wild-type) controls did not provide tolerance to the treatment of high glyphosate concentrations when treated with similar rates of glyphosate. Overall, the results showed that plants containing and expressing DGT-14 provided commercial grade resistance to glyphosate at levels up to 3 times the field rate (1120 g ae / ha).
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Table 3. Response of Arabidopsis T3 transformed with dgt-14 to a range of post-emergence applied glyphosate rates, compared to a segregation population (T ) Of dgt-1 and an untransformed control. % Visual injury 2 weeks after application. The data represent a single copy population selected from each construct that segregated as a single locus in the evaluation of T ₂ inheritance capacity.
% Injury Analysis Range (%) 0 0 0-5 0 2-10 % Injury Analysis Range (%) 0 0 0 0 2-5 Standard deviation 0.0 0.0 2.5 0.0 <0 Standard deviation 00 ' 0'0 0 the ~ 0'0 LOx— Average 0.0 0.0 COx— 0.0 4.0 Average I 0.0 0.0 0.0 0.0 CO the Replicas) sp0 ^0Λ 0 0 0 0 0 the Replicas) > 40% 0 0 0 0 0 % Injury Range (No. d 20-40% 0 0 0 0 0 % Injury Range (No. c 20-40% 0 0 0 0 0 <20%M ·'φ<20% XfM <0 CM m 10 0 t— 00 <QQ.'Φ-Λρ cxi>00 CL ra l—H Application Fee 0 g ae / ha glyphosate 420 g ae / ha glyphosate 840 g ae / ha glyphosate 1680 g ae / ha glyphosate 3360 g ae / ha glyphosateTraP9 v2 :: dgt-14 (pDAB105527) Application Fee 0 g ae / ha glyphosate 420 g ae / ha glyphosate 840 g ae / ha glyphosate 1680 g ae / ha glyphosate 3360 g ae / ha glyphosate
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% Injury Analysis Range (%) O 30-50 O 40-70 60-100% Injury Analysis Range (%)100 100 100 100 Standard deviation ο, ο | Cd cd the o 15.0 r- Standard deviation o o ’ 0'0 the o 0.0 0'0 Average 0.0 42.5 the o 47.5 LO i <r- Average 0.0 100.0 100.0 100.0 100.0 the Replicas) > 40% O CXI O - O the Replicas) Xt Λ Oxt xt 'M ^- % Injury Range (No. d 20-40% O CXICO % Injury Range (No. c 20-40% O O O O O <20%O O O O <20%I xt O O O O dgt-1 (pDAB3759) Application Fee O4— ·05 ω o M— cd05 -C05CDO The 05 ωOCD05Φ 05CDThe CM o · + - * 05 <Z> O <+ - ~ CD05(D05CDThe CO xt O- + - »05 ω oΈ)05 _ £ Z05CDThe 00 CD x— O05 CD O M— Õ505x:a>05CD o CO CO COUntransformed control Application Fee 0 g ae / ha glyphosate 420 g ae / ha glyphosate 840 g ae / ha glyphosate 1680 g ae / ha glyphosate 3360 g ae / ha glyphosate
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The data show that expression of a glyphosate-resistant enzyme (for example, DGT-28), when directed to the chloroplast of a plant cell by a transit peptide TraP in a fusion protein, is able to confer glyphosate resistance to the cell plant and plants comprised of these cells.
DGT-28, DGT-31, DGT-32 and DGT-33:
The newly designed dgt-28 v5 polynucleotide sequence of a newly designed dicot plant is listed in SEQ ID NO: 16. The dgt-28 v6 polynucleotide sequence of a monocot plant optimized is listed in SEQ ID NO: 17; this sequence was slightly modified by adding an alanine to the second amino acid position to introduce a restriction enzyme site. The resulting DNA sequences have a greater degree of codon diversity, a desirable base composition, contain strategically placed restriction enzyme recognition sites, and lack sequences that can interfere with gene transcription, or translation of the product mRNA.
Synthesis of DNA fragments comprising SEQ ID NO: 16 and SEQ ID NO: 17 containing additional sequences, such as 6-frame stops (stop codons located in all six reading frames that are added to the 3 'end of the coding sequence ) and a 5 'restriction site for cloning was performed by commercial suppliers (DNA 2.0, Menlo Park, CA). The synthetic nucleic acid molecule was then cloned into expression vectors and transformed into plants or bacteria as described in the Examples below.
Similar codon optimization strategies were used to design dgt-1, dgt-3 v2 (G173A), dgt-3 v3 (G173A; P178S), dgt-3 v4 (T174I; P178S), dgt-7 v4 (T168I; P172S; ), dgt-32 v3, dgt-33 v3 and dgt-31 v3. The codon-optimized version of these genes is listed as SEQ ID NO: 18, SEQ ID NO: 19, SEQ ID NO: 20, SEQ ID NO: 21, SEQ ID NO: 22, SEQ ID NO: 23, SEQ ID NO: 24 and SEQ ID NO: 25, respectively.
Construction of Binary Plant Vector. Standard cloning methods were used in the construction of input vectors containing a
74/161 chloroplast transit peptide polynucleotide sequence joined to dgt-28 as a structure fusion. The input vectors containing a transit peptide (TraP) fused to dgt-28 were assembled using INFUSION® Advantage Technology (Clontech, Mountain View, CA). As a result of the fusion, the first amino acid, methionine, was removed from dgt28. TraP4 v2 transit peptides (SEQ ID NO: 26), TraP5 v2 (SEQ ID NO: 27), TraP8 v2 (SEQ ID NO: 28), TraP9 v2 (SEQ ID NO: 29), TraP12 v2 (SEQ ID NO: 30) and TraP13 v2 (SEQ ID NO: 31) were each synthesized via DNA2.0 (Menlo Park, CA) and fused to the 5 'end fragment of dgt-28, up to and including a recognition site single Accl restriction endonuclease.
Binary plasmids that contained the various expression cassettes of TraP and dgt-28 were targeted by the Ubiquitin 10 promoter from Arabidopsis thaliana (AtUbilO v2; Callis et al., (1990) J. Biol. Chem., 265: 12486-12493) and flanked by the 3 'untranslated region of twenty-three open reading structures of Agrobacterium tumefaciens (AtuORF23 3' UTR v1; US Pat. No. 5,428,147).
The assembled expression cassettes of TraP and dgt-28 were engineered using GATEWAY® Technology (Invitrogen, Carlsbad, CA) and transformed into plants through Agrobacterium-mediated plant transformation. Restriction endonucleases were obtained from New England BioLab (NEB; Ipswich, MA) and T4 DNA Ligase (Invitrogen) was used for DNA binding. Gateway reactions were performed using a GATEWAY® LR CLONASE® enzyme mixture (Invitrogen) to assemble an input vector into a single target vector that contained the selectable marker cassette of the Cassava Nervous Mosaic Virus (CsVMV v2; Verdaguer and others (1996) Plant Molecular Biology, 31: 1129-1139), DSM2 (US Pat. No. 2007/086813) - Agrobacterium tumefaciens open reading frame one 3 'unstranslated region (AtuORFI 3' UTR v6; Huang and others (1990 ) J. Bacteriol 172: 1814-1822). Plasmid preparations were performed using the NUCLEOSPIN® Plasmid Kit (Macherey-Nagel Inc., Bethlehem, PA) or the Plasmid Midi Kit (Qiagen) following the instructions of the for75 / 161 suppliers. DNA fragments were isolated using QIAquick® Gel Extraction Kit (Qiagen) after electrophoresis on Tris-acetate agarose gel.
Colonies of all assembled piasmids were initially evaluated by digestion with restriction of miniprep DNA. Plasmid DNA from selected clones was sequenced by a commercial sequencing vendor (Eurofins® MWG Operon, Huntsville, AL). Sequence data was assembled and analyzed using the SEQUENCHER® software (Gene Codes Corp., Ann Arbor, Ml).
The following binary constructs express the various TraP fusion gene sequences: dgt-28 '. pDAB107527 (Figure 19) contains TraP4 v2: dgt-28 v5 (SEQ ID NO: 32); pDAB105530 (Figure 20) contains TraP5 v2: dgt-28 v5 (SEQ ID NO: 33); pDAB105531 (Figure 21) contains TraP8 v2.dgt-28 v5 (SEQ ID NO: 34); PDAB105532 (Figure 22) contains TraP9 v2.dgt-28 v5 (SEQ ID NO: 35); pDAB105533 (Figure 23) contains TraP12 v2: dgt-28 v5 (SEQ ID NO: 36) and pDAB105534 (Figure 24) contains TraP13 v3: dgt-28 v5 (SEQ ID NO: 37). The dgt-28 v5 sequence of pDAB105534 was modified, where the first codon (GCA) was changed to (GCT).
Additional Plant Binary Vector Construction. Cloning strategies similar to those described above were used to build binary piasmids that contain dgt-31, dgt-32, dgt-33, dgt-1, dgt-3 and dgt-7.
The microbially derived genes: dgt-31, dgt-32 and dgt-33 were fused with chloroplast transit peptides different from those previously described. The chloroplast transit peptides that follow have been used; TraP14 v2 (SEQ ID NO: 38), TraP23 v2 (SEQ ID NO: 39), TraP24 v2 (SEQ ID NO: 40). pDAB107532 (Figure 25) contains dgt-32 v3 fused to TraP14 v2 (SEQ ID NO: 41), pDAB107534 (Figure 26) contains dgt-33 v3 fused to TraP24 v2 (SEQ ID NO: 42) and pDAB107533 (Figure 27) contains dgt-31 v3 fused to TraP23 v2 (SEQ ID NO: 43). The dgt expression cassettes were directed by the Ubiquitin 10 promoter from Arabidopsis thaliana (AtUbilO v2 promoter) and flanked by the 3 'untranslated region of twenty-three open reading structures of Agrobacterium tumefaciens (AtuORF23 3' UTR v1). A selectable DSM-2 marker cassette containing
76/161 promoter of the Cassava Nerve Mosaic Virus (CsVMV v2) - DSM2 - 3 'untranslated region of an open reading frame for Agrobacterium tumefaciens (AtuORFI 3' UTR v6) was also present in the binary vector.
Additional binaries are constructed, where dgt-31 v3, dgt-32 v3 and dgt-33 v3 are fused to the previously described chloroplast transit peptide sequences. For example, the TraP8 v2 sequence is fused to dgt31 v3, dgt-32 v3 and dgt-33 v3 and cloned into binary vectors as described above.
Binary vectors containing the Class I genes (dgt-1, dgt-3 and dgt7) were constructed. The following binary vectors were constructed and transformed into plants: pDAB4104 (Figure 28), which contains the sequence dgt-1 v4 as described in US Patent Application Publication No. 2011/0124503, which is flanked by the Osmotine sequences of Nicotiana tabacum as described in US Patent Application Publication No. 2009/0064376; pDAB102715 (Figure 29); pDAB102716 (Figure 30);
pDAB102717 (Figure 31); and pDAB102785 (Figure 32). The various TraP chloroplast transit peptides that have been fused to dgt-28, dgt-31, dgt-32 and dgt-33 have not been added to the Class I genes, since these plant-derived sequences have chloroplast transit peptides from native plant. These vectors are described in more detail in the Table
4.
Table 4. Description of the binary vectors that contain an EPSP synthase gene
Class I (ie, dgt-1, dqt-3 or dgt-7).
Name description EPSPS mutation pDAB4104 RB7 MAR v2 :: CsVMV v2 / NtOsm 5 'UTR v2 / dgt1 v4 / NtOsm 3' UTR v2 / AtuORF24 3 'UTR v2 promoter :: AtUbilO v4 / pat v3 / AtuORFI 3'UTR v3 binary vector TI PS pDAB102715 AtUbi 10 v2 / dgt-3 v2 promoter / AtuORF23 3'UTR v1 :: CsVMV v2 / pat v9 promoter / AtuORFI 3'UTR v6 binary vector GA pDAB102716 AtUbilO promoter v2 / dgt-3 v3 / AtuORF23 3'UTR v1 :: CsVMVv2 / pat v9 promoter / AtuORFI 3'UTR v6 binary vector GA PS pDAB102717 AtUbilO promoter v2 / dgt-3 v4 / AtuORF23 3'UTR v1 :: CsVMV v2 / pat v9 promoter / AtuORFI 3'UTR v6 binary vector TI PS pDAB102785 AtUbilO promoter v2 / dgt-7 v4 / AtuORF23 3'UTR :: CsVMV v2 / DSM-2 v2 promoter / AtuORFI 3'UTR v6 binary vector TI PS
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Transformation of Arabidopsis thaliana. Arabidopsis was transformed using the floral diving method of Clough and Bent (1998). A selected Agrobacterium colony containing one of the binary plasmids described above was used to inoculate one or more 100 ml pre-cultures of YEP broth containing spectinomycin (100 mg / L) and kanamycin (50 mg / L). The culture was incubated overnight at 28 ° C with constant agitation at 225 rpm. The cells were plated at approximately 5000 xg for 10 minutes at room temperature and the resulting supernatant discarded. The cell pellet was gently suspended in 400 ml of submersion medium containing: sucrose 5% (w / v), 10 pg / L of 6-benzylaminopurine and Silwet® L-77 0.04%. Plants approximately 1 month old were immersed in the medium for 5-10 minutes with gentle agitation. The plants were positioned on their side and covered with transparent or opaque plastic bags for 2-3 hours, and then placed face up. The plants were grown at 22 ° C, with a photoperiod of 16 hours of light / 8 hours of darkness. Approximately 4 weeks after the bath, the seeds were collected.
Selection of Transformed Plants. Freshly collected Ti seed [containing the dgt and DSM-2 expression cassettes] was allowed to dry for 7 days at room temperature. Tí seed was sown in 26.5 x 51 cm germination trays, each receiving a 200 mg aliquot of stratified Ti seed (-10,000 seeds) that had previously been suspended in 40 mL of 0.1% agarose solution and stored at 4 ^o C for 2 days to complete dormancy needs and ensure germination of synchronous seed.
Sunshine Mix LP5 was covered with fine vermiculite and soaked with Hoagland's solution until moist, then allowed to drain by gravity. Each 40 mL aliquot of stratified seed was sown evenly on the vermiculite with a pipette and covered with humidity domes for 4-5 days. The domes were removed 1 day before the initial transformant selection using post-emergence glufosinate spray (selection for the co-transformed DMS-2 gene).
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Seven days after planting (DAP) (Days After Planting) and again 11 DAP, Ti plants (cotyledon and 2-4 leaf stage, respectively) were sprayed with a 0.2% Liberty herbicide solution (200 g ai / L glufosinate, Bayer Crop Sciences, Kansas City, MO) in a spray volume of 10 mL / tray (703 L / ha) using a DeVilbiss compressed air spray tip to apply an effective rate of 280 g ai / ha of glufosinate per application. Survivors (plants growing actively) were identified 4-7 days after the final spray and transplanted individually in 7.62 cm (3 inch) pots prepared with planting medium in pot (Metro Mix 360). Transplanted plants were covered with humidity domes for 3-4 days and placed in a growth chamber at 22 ° C as before or moved directly to the greenhouse. The domes were subsequently removed and the plants grown in the greenhouse (22 ± 5 ° C, 50 ± 30% RH, 14 h light: 10 h dark, minimum 500 pE / m ² s ¹ natural + supplemental light). Molecular confirmation analysis was completed on the surviving Τί plants to confirm that the glyphosate tolerance gene had stably integrated into the plant genome.
Molecular confirmation. The presence of dgt-28 and DMS-2 transgenes within the genome of Arabidopsis plants that were transformed with pDAB107527, pDAB105530, pDAB105531, pDAB105532, pDAB105533 or pDAB105534. The presence of these nucleotide sequences was confirmed through hydrolysis probe assays, gene expression cassette PCR (also described as plant transcription unit PCR - PTU PCR), Southern blot analysis and Quantitative Reverse Transcription PCR analyzes .
Arabidopsis plants were initially evaluated using a hydrolysis probe assay, analogous to TAQMAN®, to confirm the presence of the DSM-2 and dgt-28 transgenes. Events were evaluated by gene expression cassette PCR to determine whether the dgt expression cassette fully integrated into plant genomes without rearrangement. The data generated from these studies were used to determine the transgene copy number and to identify and select even
79/161 Arabidopsis products for self-fertilization and advancement for the T ₂ generation. Advanced Arabidopsis T ₂ plants were also evaluated using hydrolysis probe assays to confirm the presence and estimate the copy number of the DSM-2 and dgt genes within the plant's chromosome. Finally, a Southern blotfo assay used to confirm the estimated copy number in a subset of Arabidopsis T1 plants.
Similar assays were used to confirm the presence of the dgt-1 transgenic from plants transformed with pDAB4101, the presence of the dgt-32 transgene from plants transformed with pDAB107532, the presence of the dgt-33 transgene from plants transformed with pDAB107534, the presence of the dgt transgene -3 from plants transformed with pDAB102715, the presence of the dgt-3 transgene from plants transformed with pDAB102716, the presence of the dgt-3 transgene from plants transformed with pDAB102717 and the presence of the dgt-7 transgene from plants transformed with pDAB102785.
Hydrolysis Probe Assay. Copy number was determined on Arabidopsis T-ι and T ₂ plants using the hydrolysis probe assay described below. Plants with varying numbers of transgene were identified and advanced for subsequent glyphosate tolerance studies.
Tissue samples were collected in 96-well plates and lyophilized for 2 days. Fabric maceration was performed with a KLECO® fabric sprayer and tungsten beads (Environ Metal INC., Sweet Home, Oregon). Following tissue maceration, the genomic DNA was isolated in a high yield format using the Biosprint® 96 Plant kit (Qiagen®, Germantown, MD) according to the protocol suggested by the manufacturer. Genomic DNA was quantified using the QUANT-IT® PICO GREEN DNA ASSAY KIT (Molecular Probes, Invitrogen, Carlsbad, CA). Quantified genomic DNA was adjusted to about 2 ng / ml_ for the hydrolysis probe assay using an automatic liquid handler BIOROBOTT3000® (Qiagen, Germantown, MD). Determination of transgene copy number through hydrolysis probe assay was performed using real-time PCR using the LIGHTCYCLER® 480 system (Roche Applied Science, Indianapolis, IN). Assays were designed for DSM-2, dgt-28 and the gene for
80/161 internal reference, TAFII15 (Genbank ID: NC 003075; Duarte et al. (2001) BMC Evol. Biol., 10:61).
For amplification, LIGHTCYCLER® 480 Probes Master mixture (Roche Applied Science, Indianapólis, IN) was prepared in a final 1x concentration in a 10 pL volume multiplex reaction containing 0.1 μΜ of each primer for DSM-2 and dgt-28 , 0.4 pM for each primer for TAFII15 and 0.2 pM for each probe.
Table 5. A two-stage amplification reaction was performed with an extension at 60 ° C for 40 seconds with fluorescence acquisition. All samples were activated and the average Cycle threshold (Ct) values were used for analysis of each sample. Real-time PCR data analysis was performed using LightCycler® 1.5 software using the relative quant module and is based on the ΔΔCt method. For this, a sample of genomic DNA from a single copy calibrator and checking of 2 known copies were included in each round. The results of the copy number of the hydrolysis probe evaluation were determined for the Tt and T ₂ transgenic Arabidopsis plants.
Table 5. Primer and probe information for DSM-2, dgt-28 hydrolysis probe assay and internal reference gene (TAFII15)
Primer name Sequence DSM2A (SEQ ID NO: 44) 5 'AGCCACATCCCAGTAACGA 3' DSM2S (SEQ ID NO: 45) 5 'CCTCCCTCTTTGACGCC 3' DSM2 Cy5 probe (SEQ IDNO: 46) 5 'CAGCCCAATGAGGCATCAGC 3' DGT28F (SEQ ID NO: 47) 5 'CTTCAAGGAGATTTGGGATTTGT 3' DGT28R (SEQ ID NO: 48) 5 'GAGGGTCGGCATCGTAT 3' Probe UPL154 Cat. No. 04694406001 (Roche, Indianapolis,IN) TAFFY-HEX probe (SEQ ID NO: 49) 5 'AGAGAAGTTTCGACGGATTTCGGGC 3' TAFII15-F (SEQ ID NO: 50) 5 'GAGGATTAGGGTTTCAACGGAG 3' TAFII15-R (SEQ ID NO: 51) 5 'GAGAATTGAGCTGAGACGAGG 3'
Confirmation of dgt-28 Integration through Southern Blot Analysis. Southern blot analysis was used to establish the pattern of in
81/161 tegregation of the inserted filament DNA fragment and identifying events that contained dgt-28. The data was generated to demonstrate the integration and integrity of the transgene inserts within the Arabidopsis genome. Southern blot data was used to identify simple integration of an intact copy of T-strand DNA. Detailed Southern blot analysis was conducted using a PCR amplified probe specific for expression of the dgt-28 gene cassette. Hybridization of the probe with genomic DNA that had been digested with specific restriction enzymes identified fragments of genomic DNA of specific molecular weights, whose patterns were used to identify single-insert, full-length, transgenic Ti events to advance to the next generation.
Tissue samples were collected in 2 ml_ conical tubes (Eppendorf®) and lyophilized for 2 days. Fabric maceration was performed with a KLECKO® fabric sprayer and tungsten beads. Following tissue maceration, genomic DNA was isolated using a CTAB isolation procedure. The genomic DNA was further purified using the Qiagen® Genomic Tips kit. Genomic DNA was quantified using the Quant-IT® Pico Green test kit (Molecular Probes, Invitrogen, Carlsbad, CA). Quantified genomic DNA was adjusted to 4 pg for consistent concentration.
For each sample, 4 pg of genomic DNA was fully digested with the restriction enzyme Swal (New England Biolabs, Beverley, MA) and incubated at 25 ° C overnight, then Nsil was added to the reaction and incubated at 37 ° C for 6 hours. The digested DNA was concentrated by precipitation with Quick Precipitation Solution® (Edge Biosystems, Gaithersburg, MD) according to the protocol suggested by the manufacturer. The genomic DNA was then resuspended in 25 pL of water at 65 ° C for 1 hour. Resuspended samples were loaded onto a 0.8% agarose gel prepared in TAE 1X and electrophorified overnight at 1.1 V / cm in TAE 1X buffer. The gel was sequentially subjected to denaturation (0.2 M NaOH / 0.6 M NaCI) for 30 minutes and neutralization (0.5 M Tris-HCI (pH 7.5) / 1.5 M NaCI) for 30 minutes.
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Transfer of DNA fragments to nylon membranes was performed by passively draining 20 X SSC solution overnight through the gel on the treated IMMOBILON® NY + transfer membrane (Millipore, Billerica, MA) using a chromatography paper wick and paper. Following transfer, the membrane was quickly washed with 2X SSC, cross-linked with STRATALINKER® 1800 (Stratagene, LaJolla, CA) and vacuum-cooked at 80 ° C for 3 hours.
Blots were incubated with prehybridization solution (Perfect Hyb plus, Sigma, St. Louis, MO) for 1 hour at 65 ° C in cylindrical glass bottles using a model 400 hybridization incubator (Robbins Scientific, Synnyvale, CA). The probes were prepared from a PCR fragment containing the entire coding sequence. The PCR amplicon was purified using QIAEX® II gel extraction kit and labeled with a32P-dCTP through the Random RT Prime IT® marking kit (Stratagene, La Jolla, CA). Blots were hybridized overnight at 65 ° C with denatured probe added directly to the hybridization buffer to approximately 2 million count per blot per ml. Following hybridization, the blots were sequentially washed at 65 ° C with 0.1X SSC / 0.1% SDS for 40 minutes. Finally, the blots were expressed to store phosphorus image evaluations and imaging using a Molecular Dynamics Storm 860® imaging system.
The Southern blot analyzes completed in this study were used to determine the copy number and confirm which selected events contained the dgt-28 transgene within the Arabidopsis genome.
Confirmation of the dgt-28 Gene Expression Cassette by PCR Analysis. The presence of the dgt-28 gene expression cassette contained in the Ti plant events was detected through an end-point PCR reaction. Primers (Table 6) specific for the AtUbilO v2 promoter and AtuORF23 3'UTR v1 regions of the dgt-28 gene expression cassette were used for detection.
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Table 6. Oliqonucleotide primers used to confirm the dqt-28 gene expression cassette
Primer name Sequence Advanced trace (SEQ IDNO: 52) 5 'CTGCAGGTCAACGGATCAGGATAT 3' Reverse oligo (SEQ IDNO: 53) 5 'TGGGCTGAATTGAAGACATGCTCC 3'
The PCR reactions required a cyclization protocol of
Standard three-step PCR to amplify the gene expression cassette. All PCR reactions were completed using the following PCR conditions: 94 ° C for three minutes followed by 35 cycles of 94 ° C for thirty seconds, 60 ° C for thirty seconds and 72 ° C for three minutes. The reactions were completed using the EX-TAQ® PCR kit (TaKaRa Biotechnology Inc., Otsu, Shiga, Japan) according to the manufacturer's instructions. Following the final cycle, the reaction was incubated at 72 ° C for 10 minutes. TAE agarose gel electrophoresis was used to determine the size of the PCR amplicon. PCR amplicons of an expected size indicated that the presence of a gene expression cassette in the genome of transgenic Arabidopsis events.
Confirmation of Relative Transcription of dqt-28 through Quantitative Reverse Transcription PCR Analysis
Tissue samples from dgt-28 transgenic plants were collected in 96-well plates and frozen at 80 ° C. Tissue maceration was performed with a KLECO® tissue sprayer and tungsten beads (Environ Metal INC., Sweet Home, Oregon ). Following tissue maceration, the total RNA was isolated in high yield format using the Qiagen® Rneasy 96 kit (Qiagen®, Germantown, MD) according to the protocol suggested by the manufacturer that included the optional Dnasel treatment on the column. This step was subsequently followed by an additional Dnasel treatment (Ambion®, Austin, TX) of the total eluted RNA. Synthesis of cDNA was performed using total RNA as a template with the High Capacity cDNA Reverse Transcription® kit (Applied Biosystems, Austin, TX) following the procedure suggested by the manufacturer with the addition of the oligonucleotide, TVN.
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Expression quantification was completed through a hydrolysis probe assay and was performed using real-time PCR using the LlGHTCYCLER® 480 system (Roche Applied Science, Indianapolis, IN). The assays were designed for dgt-28 and the internal reference gene unknown protein (Genbank Accession Number: AT4G24610) using LlGHTCYCLER® Probe Design Software 2.0. For amplification, LIGHTCYCLER® 480 Probes Master mix (Roche Applied Science, Indianapolis, IN) was prepared in a final concentration 1 X in a 10 pL volume of singleplex reaction containing 0.4 μΜ for each primer and 0.2 pM for each probe. Table 7
Table 7. PCR primers used for quantitative reverse transcription PCR analysis of dgt-28
Primer name Sequence AT26410LP (SEQ IDNO: 54) 5 'CGTCCACAAAGCTGAATGTG 3' AT26410RP (SEQ IDNO: 55) 5 'CGAAGTCATGGAAGCCACTT3' UPL146 Cat. No. 04694325001 (Roche, Indianapolis, IN) DGT28F (SEQ ID NO: 56) 5 'CTTCAAGGAGATTTGGGATTTGT3' DGT28R (SEQ ID NO: 57) 5 'GAGGGTCGGCATCGTAT 3' Probe UPL154 Cat. No. 04694406001 (Roche, Indianapolis, IN)
A two-stage amplification reaction was performed with an extension at 60 ° C for 40 seconds with fluorescence acquisition. All samples were performed in triplicate and the average cycle threshold (Ct) values were used for analysis of each sample. A negative reverse transcription reaction was performed for each sample to ensure that no gDNA contamination was present. Analysis of real-time PCR data was performed based on the AACt method. This assay was used to determine the relative expression of dgt-28 in transgenic Arabidopsis events that were determined to be homozygous and homozygous. The relative transcription levels of the dgt-28 mRNA ranged from 2.5 times to 207.5 times more than the internal control. These data indicate
85/161 that dgt-28 transgenic plants contained a dgt-28 gene expression cassette and the plants were capable of transcribing the dgt-28 transgene.
Western Blotting analysis. DGT-28 was detected in leaf samples obtained from transgenic Arabidopsis thaliana plants. Plant extracts from transgenic dgt-28 plants and DGT-28 protein standards were incubated with NUPAGE® LDS sample buffer (Invitrogen, Carlsbad, CA) containing DTT at 90 ° C for 10 minutes and electrophoretically separated in a pre-gel. acrylamide casting. The proteins were then electrotransferred to a nitrocellulose membrane using the manufacturer's protocol. After blocking with WESTERNBREEZE® Blocking Mix (Invitrogen), the DGT-28 protein was detected by anti-DGT-28 antiserum followed by goat anti-rabbit phosphatase. The detected protein was visualized through a chemiluminescent substrate BCIP / NBT Western Analysis Reagent (KPL, Gaithersburg, MD). Production of an intact DGT-28 protein by Western blot indicated that the dgt-28 transgenic plants that were tested expressed the DGT-28 protein.
Transgenic Arabidopsis Ti plants containing the dgt-28 transgene were sprayed with different rates of glyphosate. High rates were applied in this study to determine the relative resistance levels (105, 420, 1,680 or 3,360 g ae / ha). A typical 1X usage rate of glyphosate that will control unprocessed Arabidopsis is 420 g ae / ha. Glyphosate formulations with the addition of ammonium sulfate were applied to the Ti plants with a sprayer in the range calibrated to 187 L / ha. The Arabidopsis T-ι plants that were used in this study had a variable copy number for the dgt-28 transgene. The low copy dgt-28 Arabidopsis T-ι plants were self-pollinated and used to produce T ₂ plants. Table 8 shows the comparison of transgenic dgt-28 plants, described for a glyphosate herbicide resistance gene, dgt-1, and wild-type controls. Table 9 shows the comparison of dgt-32, and dgt-33 described for a glyphosate herbicide resistance gene, dgt-1, and wild-type controls. Table 10 shows the comparison of the new bacterial EPSP synthase enzymes with the Class I EPSP synthase enzymes and controls in a
86/161 glyphosate rate of 1,680 g ae / ha. Glyphosate Selection Results of Transformed Arabidopsis dgt-28 Plants. The Ti transformants from Arabidopsis were first selected from the non-transformed seed base using a glufosinate selection scheme. Three trays or 30,000 seeds were analyzed for each L construct. The plants _{Ί Ί} selected above were molecularly characterized and representative plants with varying copy numbers were subsequently transplanted into individual pots and sprayed with various rates of commercial glyphosate as previously described. The response of these plants is presented in terms of visual damage% 2 weeks after treatment (WAT). The data are presented in a table showing individual plants showing little or no injury (<20%), moderate injury (20-40%) or severe injury (> 40%). An arithmetic mean and standard deviation are presented for each construct used for the transformation of Arabipodsis. The individual response range is also indicated in the last column for each rate and transformation. Untransformed, wild-type Arabidopsis (cv Columbia) served as a glyphosate-sensitive control.
The level of plant response varied. This variance can be attributed to the fact that each plant represents an independent transformation event and therefore the number of copies of the gene of interest varies from plant to plant. It was noted that some plants that contained the transgene were not tolerant to glyphosate; a complete analysis to determine whether these plants expressed the transgene has not been completed. It is likely that the presence of high copy numbers of the transgene within the Arabidopsis T1 plants resulted in transgene silencing or other epigenetic effects that resulted in glyphosate sensitivity, despite the presence of the dgt-28 transgene.
An average general population injury by rate is shown in Table 10 for glyphosate rates at 1,680 g ae / ha to demonstrate the significant difference between plants transformed with dgt-3, dgt-7, dgt-28, dgt-32 and dgt-33 versus dgt-1 and wild-type controls.
The tolerance provided by the new bacterial EPSP synthases
87/161 riou depending on the specific enzyme. DGT-28, DGT-32 and DGT-33 unexpectedly provided significant tolerance to glyphosate. The dgt genes provided herbicide resistance to individual Arabidopsis T-i plants through all tested transit peptides. In this way, the use of additional chloroplast transit peptides (i.e., TraP8 - dgt-32 or TraP8 dgt-33) would provide protection against glyphosate with similar injury levels as reported within a given treatment.
Table 8. Response of Arabidopsis T-i transformed with dgt-28 to a range of post-emergence applied glyphosate rates, compared to a resistant homozygous population dqt-1 (T4) and an untransformed control. % Visual injury 14 days after application.
pDAB107527: TraP4 v2 - dgt-28 v5 % Lesion% Lesion Averages <20% 20-40% > 40%Average Standard deviation Banner(%) 0 g ae / ha glyphosate 4 0 00.0 0.0 0 105 g ae / ha glyphosate 4 0 03.8 7.5 0-15 420 g ae / ha glyphosate 2 1 128.8 28.1 0-65 1680 g ae / ha glyphosate 0 2 255.0 26.8 35-85 3360 g ae / ha glyphosate 0 2 243.8 18.0 30-70 pDAB105530: TraP5 v2 - dgt-28 v5 % Lesion% Lesion Averages <20% 20-40% > 40%Average Standard deviation Banner(%) 0 g ae / ha glyphosate 6 0 00.0 0.0 0 105 g ae / ha glyphosate 2 2 239.3 37.4 8-100 420 g ae / ha glyphosate 1 4 133.0 26.6 8-85 1680 g ae / ha glyphosate 0 4 247.5 27.5 25-85 3360 g ae / ha glyphosate 0 0 676.7 13.7 50-85
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pDAB105531: TraP8 v2 - dgt-28 v5 % Lesion% Lesion Averages <20% 20-40% > 40%Average Standard deviation Banner(%) 0 g ae / ha glyphosate 4 0 00.0 0.0 0 105 g ae / ha glyphosate 3 1 010.8 10.4 0-25 420 g ae / ha glyphosate 3 0 122.8 18.6 8-50 1680 g ae / ha glyphosate 4 0 05.3 3.8 0-8 3360 g ae / ha glyphosate 0 4 029.3 6.8 22-35 pDAB105532: TraP9 v2 - dgt-28 v5 % Lesion% Lesion Averages <20% 20-40% > 40%Average Standard deviation Banner(%) 0 g ae / ha glyphosate 4 0 00.0 0.0 0 105 g ae / ha glyphosate 3 0 117.5 28.7 0-60 420 g ae / ha glyphosate 1 1 239.5 25.1 18-70 1680 g ae / ha glyphosate 3 0 126.3 36.1 5-80 3360 g ae / ha glyphosate 3 0 125.8 32.9 8-75 pDAB105533: TraP12 v2 - dgt-28 v5 % Lesion% Lesion Averages <20% 20-40% > 40%Average Standard deviation Banner(%) 0 g ae / ha glyphosate 5 0 00.0 0.0 0 105 g ae / ha glyphosate 4 1 010.0 10.0 0-25 420 g ae / ha glyphosate 1 1 353.6 34.6 8-85 1680 g ae / ha glyphosate 4 1 011.0 8.2 0-20 3360 g ae / ha glyphosate 0 2 355.0 25.5 25-80
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pDAB105534: TraP13 v2 - dgt-28 v5 % Lesion% Lesion Averages <20% 20-40% > 40%Average Standard deviation Banner(%) 0 g ae / ha glyphosate 5 0 00.0 0.0 0 105 g ae / ha glyphosate 4 0 114.0 20.6 0-50 420 g ae / ha glyphosate 3 1 117.6 19.5 0-50 1680 g ae / ha glyphosate 3 0 239.0 47.1 5-100 3360 g ae / ha glyphosate 2 2 131.2 22.3 18-70 pDAB4104: dgt-1 (transformed control) % Lesion% Lesion Averages <20% 20-40% > 40%Average Standard deviation Banner(%) 0 g ae / ha glyphosate 5 0 00.0 0.0 0 105 g ae / ha glyphosate 0 0 480.0 0.0 80 420 g ae / ha glyphosate 0 0 480.0 0.0 80 1680 g ae / ha glyphosate 0 0 480.0 0.0 80 3360 g ae / ha glyphosate 0 0 481.3 2.5 80-85 WT (Untransformed Control) % Lesion% Lesion Averages <20% 20-40% > 40%Average Standard deviation Banner(%) 0 g ae / ha glyphosate 5 0 00.0 0.0 0 105 g ae / ha glyphosate 0 0 4100.0 0.0 100 420 g ae / ha glyphosate 0 0 4100.0 0.0 100 1680 g ae / ha glyphosate 0 0 4100.0 0.0 100 3360 g ae / ha glyphosate 0 0 4100.0 0.0 100
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Table 9. Response of Arabidopsis transformed with dqt-32 and dqt-33 to a range of rates of glyphosate applied post-emergence, compared with a homozygous resistant population dqt-1 (T4) and an untransformed control. % Visual injury 14 days after application.
pDAB107532: TraP14 v2 - dgt-32 v3 % Lesion% Lesion Averages <20% 20-40% > 40%Average Standard deviation Range (%) 0 g ae / ha glyphosate 4 0 00.0 0.0 0 105 g ae / ha glyphosate 4 0 00.0 0.0 0 420 g ae / ha glyphosate 2 0 230,0 29.4 0-60 1680 g ae / ha glyphosate 3 0 117,5 21.8 5-50 3360 g ae / ha glyphosate 0 3 135,0 30.0 20-80 pDAB107534: TraP24 v2 - dgt-33 v3 % Lesion% Lesion Averages <20% 20-40% > 40%Mé dia Standard deviation Banner(%) 0 g ae / ha glyphosate 4 0 00.0 0.0 0 105 g ae / ha glyphosate 2 2 021,3 14.9 5-40 420 g ae / ha glyphosate 1 1 246,3 30.9 5-70 1680 g ae / ha glyphosate 1 0 362,5 38.8 5-90 3360 g ae / ha glyphosate 1 0 362, 0 36.0 8-80
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pDAB4104: dgt-1 (transformed control) % Lesion% Lesion Averages <20% 20-40% > 40%Mé dia Standard deviation Banner(%) 0 g ae / ha glyphosate 4 0 00.0 0.0 0 105 g ae / ha glyphosate 0 2 342,5 15.0 20-50 420 g ae / ha glyphosate 0 1 238,8 11.1 25-50 1680 g ae / ha glyphosate 0 0 479, 0 19.4 50-90 3360 g ae / ha glyphosate 0 0 450,0 0.0 50 WT (Untransformed Control) % Lesion% Lesion Averages <20% 20-40% > 40%Average Standard deviation Banner(%) 0 g ae / ha glyphosate 4 0 00.0 0.0 0 105 g ae / ha glyphosate 0 0 485,0 0.0 85 420 g ae / ha glyphosate 0 0 4100, 0 0.0 100 1680 g ae / ha glyphosate 0 0 4100, 0 0.0 100 3360 g ae / ha glyphosate 0 0 4100, 0 0.0 100
Table 10. Response of Arabidopsis Ti transformed with dgt-28, dqt-32, dqt-33 and dqt-7 to glyphosate applied post-emergence at 1,680 g ae / ha compared with a dqt-1 homozygous resistant population (TJ and a control unprocessed% visual damage 14 days after application.
% Lesion% Lesion <20% 20-40% > 40%Average Standard deviation Banner(%) Bacterial Enzymes pDAB107527 TraP4 v2 dgt-28 v5 0 2 255.0 26.8 35-85 pDAB105530 TraP5 v2 -dgt -28 v5 0 4 247.5 27.5 25-85 pDAB105531 TraP8 v2 dgt-28 v5 4 0 05.3 3.8 0-8 pDAB105532 TraP9 v2 dgt -28 v5 3 0 126.3 36.1 5-80
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% Lesion % Lesion Range (%) <20% 20-40% > 40%Average Standard deviationpDAB105533 Trap12 v2- dgt-28 v5 4 1 011.0 8.2 0-20pDAB105534 TraP13 v2- dgt-28 v5 3 0 239.0 47.1 5-100pDAB107532 TraP14 v2- dgt-32 v3 3 0 117.5 21.8 5-50pDAB107534 TraP24 v2 -- dgt-33 v3 1 0 362.5 38.8 5-90 Enzymes pDAB102715 dgt-3 v2 4 0 342 48 0-100 Class I pDAB102716 dgt-3 v3 2 0 114 23 0-40pDAB102717 dgt-3 v4 3 2 128 35 ΙΟΙ 00pDAB102785 dgt-7 v4 0 1 145 21 30-60pDAB4104 dgt-1 (transformed control) 0 0 480.0 0.0 80 WT (Untransformed Control) 0 0 4100,0 0.0 100
Dgt-28 as a Selectable Marker. The use of dgt-28 as a selectable marker for glyphosate selection agent is tested with the Arabidopsis-transformed plants described above. Approximately 50 Arabidopsis seeds of generation T ₄ (homozygous for dgt28) are sprinkled on approximately 5,000 wild type seeds (sensitive to glyphosate). The seeds are germinated and the seedlings are sprayed with a selection dose of glyphosate. Several glyphosate treatments are compared; each seed tray receives one or two moments of application of glyphosate in one of the following treatment schedules: 7 DAP (days after planting), 11 DAP or 7 followed by 11 DAP. Since all plants also contain a glufosinate resistance gene in the same transformation vector, plants containing dgt-28 selected with glyphosate can be directly compared to plants containing DSM-28 or pat selected with glufosinate.
Glyphosate treatments are applied with a DeVilbiss® spray tip as previously described. Transgenic plants
93/161 cas containing dgt-28 are identified as resistant or sensitive 17 DAP. Treatments of 26.25-1680 g ae / ha of glyphosate applied 7 and 11 days after planting (DAP) show effective selection of transgenic Arabidopsis plants that contain dgt-28. Sensitive and resistant plants are counted and the number of glyphosate-tolerant plants is verified to relate to the original number of transgenic seeds containing the dgt28 transgene that are planted. These results indicate that dgt-28 can be effectively used as an alternative selectable marker for a transformed Arabidopsis population.
Inheritance Capacity. Confirmed transgenic Arabidopsis events were self-pollinated to produce T ₂ seed. These seeds had their progeny tested through the application of Ignite® herbicide containing glufosinate (200 g ae / ha) for 100 random T ₂ seedlings. Each individual T ₂ plant was transplanted into 7.5 cm pots before spray application (strip sprayer at an application rate of 187 L / ha). The T-ι families (T ₂ plants) segregated in the Resistant 3: Sensitive 1 model anticipated for a single locus dominantly inherited with Mendelian inheritance as determined through Chi square analysis (P> 0.05). The percentage of T-ι families that segregated with the expected Mendelian inheritance is illustrated in Table 11 and demonstrates that the dgt28 characteristic is passed through Mendelian inheritance to the T ₂ generation. Seeds were collected from 5 to 15 T ₂ individuals (T3 seed). Twenty-five T ₃ seedlings from each of 3-4 randomly selected T ₂ families had their progeny tested as previously described. The data showed no segregation and therefore demonstrated that dgt-28 and dgt-3 are stably integrated within the chromosome and inherited in a Mendelian manner for at least three generations.
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Table 11. Percentage of families (T Plants) segregating as Mendeian inheritance for a 100-plant progeny test
Gene of Interest T1 Families Tested Segregating at Locus 1 (%) dgt-3 v2 64% dgt-3 v3 60% dgt-3 v4 80% dgt-7 v4 63% TraP5 v2 - dgt-28 v5 100% TraP8 v2 - dgt-28 v5 100% TraP9 v2 - dgt-28 v5 100% TraP 12 ^ 2-dgt-28 v5 50% TraP13 v2- dgt-28 v5 75% yfp Transgenic Control Plants 100%
Arabidopsis T Data. Second generation (T ₂ ) plants of selected Arabidopsis T events that contained low copy numbers of the dgt-28 transgene were further characterized for glyphosate tolerance. Glyphosate was applied as previously described. The response of the plants is presented in terms of% visual damage 2 weeks after treatment (WAT) (Weeks After Treatment). The data are presented as histograms of individuals exhibiting little or no injury (<20%), moderate injury (20-40%) or severe injury (> 40%). An arithmetic mean and standard deviation are presented for each construct used for the transformation of Arabidopsis. The range in individual response is also indicated in the last column for each rate and transformation. Untransformed, wild-type Arabidopsis (cv. Columbia) served as a glyphosate-sensitive control. In generation T ₂ hemizygous and homozygous plants were available for testing for each event and were then included for each glyphosate rate tested. Hemizigote plants contain two different alleles at one locus as compared to homozygous plants that contain the same two alleles at one locus. Response variability to glyphosate is expected in the T ₂ generation as a result of the difference in gene dosage for hemizygote compared to homozygous plants. The variability
95/161 in response to glyphosate is reflected in the standard deviation and response range.
In the T ₂ generation, both single and multicopy dgt-28 events were characterized for glyphosate tolerance. Within an event, single copy plants showed similar levels of glyphosate tolerance. Characteristic data for a single copy T ₂ event is shown in Table 12. Events containing dgt-28 bound via TraP5 v2 did not provide robust tolerance to glyphosate compared to dgt-28 constructs that contained other TraP transit peptides. However, the TraP5 dgt-28 constructs did not provide a low level of tolerance to glyphosate compared to the untransformed Columbia control. There have been cases where events that have been shown to contain two or more copies of dgt-28 were more susceptible to high glyphosate rates (data not shown). This increase in sensitivity to glyphosate is similar to the data previously described for Ti plants that also contained high copy numbers of the dgt-28 transgene. It is likely that the presence of high copy numbers of the transgene within the Arabidopsis plant will result in transgene silencing or other epigenetic effects that have resulted in sensitivity to glyphosate, despite the presence of the dgt-28 transgene.
These events contained dgt-28 linked with TraP5 v2 (pDAB105530), TraP12 v2 (pDAB105533) and TraP13 v2 (pDAB105534).
In addition to dgt-28, Arabidopsis T ₂ events transformed with dgt-3 are shown in Table 13. As described for the events of dgt-28 in Table 12, the data table contains a representative event that is characteristic of the response to glyphosate for each construct. For the characterization of dgt-3, constructs containing a single PTU (plant transformation unit) with the dgt-3 gene being directed by the AtUbilO promoter (pDAB102716, Figure 30 and pDAB102715, Figure 29) were compared with constructs with the same gene containing 2 PTUs of the gene (pDAB102719, Figure 33; pDAB102718, Figure 34). Constructs containing 2 PTU used the AtUbilO promoter to target one copy of the gene and the CsVMV promoter to target another copy. The use of dual PTU has been incorporated to compare dgt-3 transgenic plants with plants
96/161 transgenic dgt-28 that contained two copies of the transgene. Data demonstrated that single copy dgt-3 T ₂ events with only a single PTU were more susceptible to glyphosate than tested single copy dgt-28 events, but were more tolerant than the untransformed control. Ti families containing 2 PTGs of the dgt-3 gene provided a higher level of visual tolerance to glyphosate compared to the 1 PTU constructs. In both cases, Τ _Ί families were compared with dgt-1 and wild type control. T ₂ data demonstrate that dgt-28 provides robust tolerance as single copy events.
Table 12. Response of selected individual Arabidopsis T ₂ events containing dgt-28 to glyphosate applied post-emergence at variable rates, compared with dqt-1 (T4) homozygous resistant population and an untransformed control. % Visual injury 14 days after application.
pDAB105530: TraP5 v2 - dgt-28 v5 % Lesion% Lesion 1 copy <20% 20-40% > 40%Me-day Standard deviation Banner(%) 0 g ae / ha glyphosate 4 0 00.0 0.0 0 420 g ae / ha glyphosate 0 0 475.0 17.8 50-90 840 g ae / ha glyphosate 0 0 480.0 20.0 50-90 1680 g ae / ha glyphosate 0 0 475.0 10.8 60-85 3360 g ae / ha glyphosate 0 0 476.3 4.8 70-80 pDAB105531: TraP8 v2 - dgt-28 v5 % Lesion% Lesion 1 copy <20% 20-40% > 40%Average Standard deviation Banner(%) 0 g ae / ha glyphosate 4 0 00.0 0.0 0 420 g ae / ha glyphosate 4 0 00.5 1.0 0-2 840 g ae / ha glyphosate 4 0 01.3 2.5 0-5 1680 g ae / ha glyphosate 4 0 07.5 5.0 5-15 3360 g ae / ha glyphosate 4 0 07.5 6.5 0-15
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pDAB105532: TraP9 v2 - dgt-28 v5 % Lesion% Lesion 1 copy <20% 20-40% > 40%Average Standard deviation Banner(%) 0 g ae / ha glyphosate 4 0 00.0 0.0 0 420 g ae / ha glyphosate 4 0 02.0 4.0 0-8 840 g ae / ha glyphosate 4 0 09.0 2.0 8-12 1680 g ae / ha glyphosate 4 0 07.3 4.6 2-12 3360 g ae / ha glyphosate 4 0 011.0 1.2 10-12 pDAB105533: TraP12 v2 - dgt-28 v5 % Lesion% Lesion 1 copy <20% 20-40% > 40%Average Standard deviation Banner(%) 0 g ae / ha glyphosate 4 0 00.0 0.0 0 420 g ae / ha glyphosate 4 0 00.0 0.0 0 840 g ae / ha glyphosate 4 0 00.0 0.0 0 1680 g ae / ha glyphosate 4 0 00.0 0.0 0 3360 g ae / ha glyphosate 3 1 013.3 7.9 8-25 pDAB105534: TraP13 v2 - dgt-28 v5 % Lesion% Lesion 1 copy <20% 20-40% > 40%Average Standard deviation Banner(%) 0 g ae / ha glyphosate 4 0 00.0 0.0 0 420 g ae / ha glyphosate 3 1 05.0 10.0 0-20 840 g ae / ha glyphosate 3 1 05.0 10.0 0-20 1680 g ae / ha glyphosate 2 2 010.0 11.5 0-20 3360 g ae / ha glyphosate 2 2 015.0 12.2 5-30
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WT (Untransformed Control) % Lesion% Lesion<20% 20-40% > 40%Average Standard deviation Banner(%) 0 g ae / ha glyphosate 4 0 00.0 0.0 0 420 g ae / ha glyphosate 0 0 4100.0 0.0 100 840 g ae / ha glyphosate 0 0 4100.0 0.0 100 1680 g ae / ha glyphosate 0 0 4100.0 0.0 100 3360 g ae / ha glyphosate 0 0 4100.0 0.0 100 pDAB4104: dgt-1 (transformed control) % Lesion% Lesion 1 copy <20% 20-40% > 40%Me-day Standard deviation Banner(%) 0 g ae / ha glyphosate 4 0 00.0 0.0 0 420 g ae / ha glyphosate 0 4 037.5 2.9 35-40 840 g ae / ha glyphosate 0 0 445.0 0.0 45 1680 g ae / ha glyphosate 0 0 447.5 2.9 45-50 3360 g ae / ha glyphosate 0 0 450.0 0.0 50
Table 13. Arabidopsis T event response selected transformed with dqt-3 to glyphosate applied post-emergence at variable rates.
% Visual injury 14 days after application
pDAB102716: dgt-3 v3 (1 PTU) % Lesion% Lesion 1 sec copy <20% 20-40% > 40%Average Standard deviation Banner(%) 0 g ae / ha glyphosate 4 0 00 0 0 420 g ae / ha glyphosate 1 1 239 25 15-65 840 g ae / ha glyphosate 0 2 250 23 30-70 1680 g ae / ha glyphosate 0 1 369 19 40-80 3360 g ae / ha glyphosate 0 0 479 6 70-85
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pDAB102719: dgt-3 v3(2 OCT) % Lesion% Lesion 1 sec copy <20% 20-40% > 40%Average Standard deviation Banner(%) 0 g ae / ha glyphosate 4 0 00 0 0 420 g ae / ha glyphosate 0 4 020 0 20 840 g ae / ha glyphosate 0 3 138 5 35-45 1680 g ae / ha glyphosate 3 1 015 7 10-25 3360 g ae / ha glyphosate 2 2 021 8 15-30
pDAB102715: dgt-3 v2 (1 PTU) % Lesion% Lesion 1 sec copy <20% 20-40% > 40%Average Standard deviation Banner(%) 0 g ae / ha glyphosate 4 0 00 0 0 420 g ae / ha glyphosate 2 2 026 16 10-40 840 g ae / ha glyphosate 0 2 255 17 40-70 1680 g ae / ha glyphosate 0 2 256 22 35-75 3360 g ae / ha glyphosate 0 0 465 17 50-80
pDAB102718: dgt-3 v2(2 OCT) % Lesion% Lesion 1 sec copy <20% 20-40% > 40%Average Standard deviation Banner(%) 0 g ae / ha glyphosate 4 0 00 0 0 420 g ae / ha glyphosate 4 0 05 7 0-15 840 g ae / ha glyphosate 2 2 023 10 15-35 1680 g ae / ha glyphosate 3 0 120 20 5-50 3360 g ae / ha glyphosate 1 1 236 22 15-60
Arabidopsis T _{3 data} . Plants of the third generation (T ₃ ) of selected Arabidopsis T ₂ events that contained low copy numbers of the dgt-28 transgene were further characterized for tolerance to glyphosate. Twenty-five plants per line were selected with glufosinate as previously described and the lines of each
100/161 constructs tested did not secrete into the selectable marker gene. Glyphosate was applied as previously described. The response of the plants is presented in terms of visual damage% 2 weeks after treatment (WAT). The data are presented as a histogram of individuals showing little or no injury (<20%), moderate injury (20-40%) or severe injury (> 40%). An arithmetic mean and standard deviation are presented for each construct used for the transformation of Arabidopsis. The individual response range is also indicated in the last column for each rate and transformation. Untransformed, wild-type Arabidopsis (cv. Co10 lumbia) served as a glyphosate-sensitive control.
Table 14, Event response of selected individual Arabidopsis Ts containing dgt-28 to glyphosate applied postemergence at varying rates, compared to a homozygous resistant population of dgt-1 (T4) and an untransformed control. % Visual injury 14 days ^ after application
dgt-28 (pDAB107602) % Injury Range (No. of Replies)% Injury Analysis Application Fee <20% 20-40% > 40%Average Standard deviation Banner(%) 0 g ae / ha glyphosate 4 0 00.0 0.0 0 420 g ae / ha glyphosate 0 0 473.8 2.5 70-75 840 g ae / ha glyphosate 0 0 471.3 7.5 60-75 1680 g ae / ha glyphosate 0 0 477.5 2.9 75-80 3360 g ae / ha glyphosate 0 0 477.5 2.9 75-80
TraP4 :: dg / -28(pDAB107527) % Injury Range (No. of Replies)% Injury Analysis............ Application Fee <20% 20-40% > 40%Average Standard deviation Banner(%) 0 g ae / ha glyphosate 4 0 00.0 0.0 0 420 g ae / ha glyphosate 4 0 00.0 0.0 0 840 g ae / ha glyphosate 4 0 05.0 0.0 5 1680 g ae / ha glyphosate 4 0 010.0 0.0 10 3360 g ae / ha glyphosate 1 3 018.8 2.5 15-20
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TRAPõ jV.: Dgt-28 (pDAB102792) % Injury Range% Injury Analysis (No. of icas) Application Fee <20% 20-40% > 40%Average Standard deviation Banner(%) 0 g ae / ha glyphosate 4 0 00.0 0.0 0 420 g ae / ha glyphosate 3 0 00.0 0.0 0 840 g ae / ha glyphosate 3 0 00.0 0.0 0 1680 g ae / ha glyphosate 3 0 06.0 1.7 5-8 3360 g ae / ha glyphosate 2 0 06.5 2.1 5-8
TraP5 v2 :: dgt-28 (pDAB105530) % Injury Range (No. of Replies)% Injury Analysis Averages <20% 20-40% > 40%Average Standard deviation Banner(%) 0 g ae / ha glyphosate 4 0 00.0 0.0 0 420 g ae / ha glyphosate 4 0 06.0 1.7 5-8 840 g ae / ha glyphosate 4 0 08.0 0.0 8 1680 g ae / ha glyphosate 4 0 014.3 1.5 12-15 3360 g ae / ha glyphosate 1 3 018.7 2.5 15-20
TraP8 v2 :: dgt-28 (pDAB105531) % Injury Range% Injury Analysis (At the. from Rép icas) Application Fee <20% 20-40% > 40%Average Standard deviation Banner(%) 0 g ae / ha glyphosate 4 0 00.0 0.0 0 420 g ae / ha glyphosate 4 0 02.5 5.0 0-10 840 g ae / ha glyphosate 4 0 03.3 3.9 0-8 1680 g ae / ha glyphosate 4 0 02.5 2.9 0-5 3360 g ae / ha glyphosate 4 0 07.3 6.4 2-15
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TraP9 v2 :: dgt-28 (pDAB105532) % Range of L (No. of Rep _ are icas)% Injury Analysis Application Fee <20% 20-40% > 40%Average Standard deviation Banner(%) 0 g ae / ha glyphosate 4 0 00.0 0.0 0 420 g ae / ha glyphosate 4 0 01.3 2.5 0-5 840 g ae / ha glyphosate 4 0 01.8 2.4 0-5 1680 g ae / ha glyphosate 4 0 00.0 0.0 0 3360 g ae / ha glyphosate 4 0 010.0 4.4 5-15
TraP12 v2 :: dgt-28(pDAB105533) % Injury Range% Injury Analysis (No. of icas) Application Fee <20% 20-40% > 40%Average Standard deviation Banner(%) 0 g ae / ha glyphosate 4 0 00.0 0.0 0 420 g ae / ha glyphosate 4 0 00.0 0.0 0 840 g ae / ha glyphosate 4 0 00.0 0.0 0 1680 g ae / ha glyphosate 4 0 03.8 7.5 0-15 3360 g ae / ha glyphosate 4 0 06.3 4.8 0-10
TraP13 v2 :: dgt-28 (pDAB105534) % Injury Range% Injury Analysis (At the. from Rép icas) Application Fee <20% 20-40% > 40%Average Standard deviation Banner(%) 0 g ae / ha glyphosate 4 0 00.0 0.0 0 420 g ae / ha glyphosate 2 2 010.0 11.5 0-20 840 g ae / ha glyphosate 4 0 01.3 2.5 0-5 1680 g ae / ha glyphosate 4 0 02.8 1.5 2-5 3360 g ae / ha glyphosate 4 0 08.0 0.0 8
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TraP23 :: dgt-28 (pDAB107553) % Injury Range% Injury Analysis (No. of icas) Application Fee <20% 20-40% > 40%Average Standard deviation Range (%) 0 g ae / ha glyphosate 4 0 00.0 0.0 0 420 g ae / ha glyphosate 4 0 00.0 0.0 0 840 g ae / ha glyphosate 4 0 00.0 0.0 0 1680 g ae / ha glyphosate 4 0 07.8 2.1 5-10 3360 g ae / ha glyphosate 4 0 010.8 3.0 8-15
WT (Untransformed Control) % Injury Range% Injury Analysis (No. of icas) Application Fee <20% 20-40% > 40%Average Standard deviation Banner(%) 0 g ae / ha glyphosate 4 0 00.0 0.0 0 420 g ae / ha glyphosate 0 0 4100.0 0.0 100 840 g ae / ha glyphosate 0 0 4100.0 0.0 100 1680 g ae / ha glyphosate 0 0 4100.0 0.0 100 3360 g ae / ha glyphosate 0 0 4100.0 0.0 100
Selection of transformed plants. Freshly harvested T ₂ seeds [genes dgt-31, dgt-32 and dgt-33 v1] were allowed to dry at room temperature and sent to Indianapolis for testing. Seed Τ _Ί was sown 5 in 26.5 x 51 cm germination trays (TO Plastics Inc., Clearwater,
MN), each receiving 200 mg aliquots of stratified Τ _Ί seed (-10,000 seeds) that had previously been suspended in 40 mL of 0.1% agarose solution and stored at 4 ^o C for 2 days to complete the needs of dormancy and ensure germination of synchro seed 10 in.
Sunshine Mix LP5 (Sun Gro Horticulture Inc., Bellevue, WA) was covered with fine vermiculite and soaked with Hoagland's solution until moist, then allowed to drain by gravity. Each 40 mL aliquot of stratified seed was sown evenly over the vermiculite with
104/161 a pipette and covered with moisture domes (KORD® Products, Bramalea, Ontario, Canada) for 4-5 days. The domes were removed once the plants had germinated before the initial transformant selection using post-emergence glufosinate spray (selection for the transformed dsm ' ² co5 gene).
Six days after planting (DAP) and again 10 DAPT, Ti plants (cotyledon and stage 2-4 leaves, respectively) were sprayed with a 0.1% solution of IGNITE® herbicide (280 g ai / L of glufosinate, Bayer Crop Sciences, Kansas City, MO) in a spray volume of 10 10 ml / tray (703 L / ha) using a DeVilbiss® compressed air spray tip to apply an effective rate of 200 g ae / ha of glufosinate per application. Survivors (plants growing actively) were identified 4-7 days after the final spray. Surviving plants were transplanted, individually in pots of 7.62 cm (3 inches) prepared with planting medium in pot (Metro Mix 360®). Plants were grown in the greenhouse at least 1 day before tissue sampling for copy number analysis.
Ti plants were sampled and copy number analysis for dgt-31, dgt-32 and dgt-3 v1 genes was completed. Ti plants were then assigned at various rates of glyphosate so that a range of copies was among each rate. For Arabidopsis, 26.25 g ae / ha of glyphosate is an effective dose to distinguish sensitive plants from those with significant levels of resistance. High rates were applied to determine the relative resistance levels (105, 420, 1680 or 3360 g ae / ha). Table 15 25 shows the comparisons described for dgt-1.
All glyphosate herbicide applications were made through a strip sprayer at a spray volume of 187 L / ha. The glyphosate used was from the commercial Durango dimethylamine salt formulation (480 g ae / L, Dow AgroSciences, LLC). Low copy T-ι plants that showed tolerance to either glufosinate or glyphosate were further evaluated in the T ₂ generation.
The first Arabidopsis transformations were carried out _
105/161 using dgt-31, dgt-32 and dgt-33 v1. Forman Transformants were first selected from the basis of unprocessed seeds using a glufosinate selection scheme. Three trays or 30,000 seeds were analyzed for each Τ _Ί construct. Transformation frequency was calculated and results from constructs of dgt-31, dgt-32 and dgt-33 are listed in Table 15.
Table 15. Transformation frequency of Arabidopsis Ti constructs dgt-31, dqt-32 and dgt-33 selected with glufosinate for selection of the selectable marker gene DSM-2
Construct Cassette Transformation Frequency (%) pDAB107532 AtUbi10 / TraP14 dgt-32 v1 0.47 pDAB107533 AtUbi10 / TraP23 dgt-31 v1 0.36 pDAB107534 AtUbi10 / TraP24 dgt-33 v1 0.68
Ti plants selected above were subsequently transplanted into individual pots and sprayed with varying rates of commercial glyphosate. Table 16 compares the response of dgt-31, dgt-32 and dgt-33 and control genes in providing glyphosate resistance to Arabidopsis T-ι transformers. The answer is presented in terms of visual injury% 2 WAT. The data are presented as a histogram of individuals exhibiting little or no injury (<20%), moderate injury (20-40%) or severe injury (> 40%). An arithmetic mean and standard deviation are presented for each treatment. The individual response range is also indicated in the last column for each rate and transformation. Untransformed wild-type arabidopsis (cv. Columbia) served as a glyphosate-sensitive control. The DGT-31 (v1) gene with TraP23 transit peptide provided light herbicide tolerance to individual Arabidopsis Ti plants compared to the negative control, but the gene exhibited improved tolerance with TraP8 transit peptide. Both DGT-32 and DGT-33 demonstrated robust tolerance to glyphosate at the rates tested with TraP8 and its respective different chloroplast transit peptide (TraP14 and TraP24, respectively). Within a given treatment, the level of plant response varied widely, which can be attributed to the fact that each plant represents an event of
106/161 independent transformation and then the copy number of the gene of interest varies from plant to plant. Importantly, at each rate of glyphosate tested, there were individuals who were more tolerant than others. An average general population lesion by rate is shown in Table 16 to 5 demonstrating the significant difference between plants transformed with dgt31, dgt-32 and dgt-33 v1 versus dgt-1 v1 or wild type controls.
Table 16. dgt-31, dgt-32 and dqt-33 v1 transformed Arabidopsis T _A response to a range of post-emergence applied glyphosate rates compared to a homozygous resistant population of dgt-1 (T4) or a contro10 and not transformed. % Visual injury 2 weeks after treatment
TraP23 dgt-31 % Lesion % Lesion Averages <20% 20-40% > 40% Me-day Standard deviation Banner(%) 0 g ae / ha glyphosate 4 0 0 0.0 0.0 0 105 g ae / ha 0 0 4 81.3 2.5 80-85 420 g ae / ha 0 0 4 97.3 4.9 90-100 1680 g ae / ha 0 0 4 90.0 7.1 85-100 3360 g ae / ha 0 0 4 91.3 6.3 85-100 TraP14 dgt-32 % Lesion % Lesion Averages <20% 20-40% > 40% Average Standard deviation Banner(%) 0 g ae / ha glyphosate 4 0 0 0.0 0.0 0 105 g ae / ha 4 0 0 0.0 0.0 0 420 g ae / ha 2 0 2 30.0 29.4 0-60 1680 g ae / ha 3 0 1 17.5 21.8 5-50 3360 g ae / ha 0 3 1 35.0 30.0 20-80 TraP24 dgt-33 % Lesion % Lesion Averages <20% 20-40% > 40% Average Standard deviation Banner(%) 0 g ae / ha glyphosate 4 0 0 0.0 0.0 0 105 g ae / ha 2 2 0 21.3 14.9 5-40 420 g ae / ha 1 1 2 46.3 30.9 5-70
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1680 g ae / ha 1 0 3 62.5 38.8 5-90 3360 g ae / ha 1 0 3 62.0 36.0 8-80 TraP8 dgt-31 % Lesion % Lesion Averages <20% 20-40% > 40% Average. DetourPattern Banner(%) 0 g ae / ha glyphosate 4 0 0 0.0 0.0 0.0 105 g ae / ha glyphosate 0 1 3 0.0 43.8 17.0 420 g ae / ha glyphosate 1 2 1 0.0 43.8 32.5 1680 g ae / ha glyphosate 0 1 3 0.0 71.3 27.8 3360 g ae / ha glyphosa-to 0 0 4 0.0 81.3 8.5 TraP8 dgt-32 % Lesion % Lesion Averages <20% <20% <20% Average. Standard deviation Banner(%) 0 g ae / ha glyphosate 4 0 4 0.0 0.0 0.0 105 g ae / ha glyphosate 4 0 0 0.0 0.0 0.0 420 g ae / ha glyphosate 4 0 0 0.0 7.5 5.0 1680 g ae / ha glyphosate 3 1 0 0.0 10.8 9.6 3360 g ae / ha glyphosate 4 0 0 0.0 12.8 3.2 TraP8 dgt-33 % Lesion % Lesion Averages <20% <20% <20% Average. Standard deviation Banner(%) 0 g ae / ha glyphosate 4 0 0 0.0 0.0 0.0 105 g ae / ha glyphosate 4 0 0 0.0 0.0 0.0 420 g ae / ha glyphosate 4 0 0 0.0 2.5 3.8 1680 g ae / ha glyphosate 4 0 0 0.0 6.3 2.5 3360 g ae / ha glyphosate 3 1 0 0.0 20.0 13.5 dgt-1 (transformed control) % Lesion % Lesion Averages <20% 20-40% > 40% Average Standard deviation Banner(%) 0 g ae / ha glyphosate 4 0 0 0.0 0.0 0
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105 g ae / ha 0 1 3 42.5 15.0 20-50 420 g ae / ha 0 2 2 38.8 11.1 25-50 1680 g ae / ha 0 0 4 79.0 19.4 50-90 3360 g ae / ha 0 0 4 50.0 0.0 50 WT (Untransformed Control) % Lesion % Lesion Averages <20% 20-40% > 40% Average DetourPattern Banner(%) 0 g ae / ha glyphosate 4 0 0 0.0 0.0 0 105 g ae / ha 0 0 4 85.0 0.0 85 420 g ae / ha 0 0 4 100.0 0.0 100 1680 g ae / ha 0 0 4 100.0 0.0 100 3360 g ae / ha 0 0 4 100.0 0.0 100
Corn Processing. Standard cloning methods, as described above, were used in the construction of binary vectors for use in Agrobacterium tumefaciens-mediated corn transformation. Table 17 lists the vectors that were built for processing corn. The following gene elements were used in the vectors that contained dgt-28 ', the Zea mays Ubiquitin 1 promoter (ZmUbil; US Patent No. 5,510,474) was used to target the dgt-28 coding sequence that is flanked by a 3 'untranslated region of Zea mays Lipase (ZmLip 3'UTR; US Patent No. 7179902), the selectable marker cassette consists of the Zea mays Ubiquitin 1 promoter that was used to target the aad coding sequence -1 (US Patent No. 7,838,733) which is flanked by the 3 'untranslated region of Lipase from Zea mays. The aad-1 coding sequence gives tolerance to phenoxy auxin herbicides, such as 2,4-dichlorophenoxyacetic acid (2,4-D) and aryloxyphenoxypropionate (AOPP) herbicides.
The constructs of dgt-28 were constructed as standard binary vectors and vectors of Agrobacterium superbinary system (Japan Tobacco, Tokyo, JP). Standard binary vectors include: pDAB107663, pDAB107664, pDAB107665 and pDAB107665. The vectors of the Agrobacterium superbinary system include pDAB108384, pDAB108385, pDAB108386 and pDAB108387.
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Additional constructs have been completed, which contain a fluorescent yellow protein reporter gene (yfp U.S. Patent Application 2007/0298412). pDAB109812 contains a yfp reporter gene cassette that is targeted by the Zea mays Ubiquitin 1 promoter and flanked by the Zea mays 3 'per 5 untranslated region (Zm per5 3'UTR; US Patent No. 7179902), the cassette from selectable marker consists of the promoter of the bacilliform sugarcane virus (SCBV; US Patent No. 5,994,123) which is used to target the expression of aad-1 and is flanked by the 3 'untranslated region of Lipase from Zea Mays . pDAB101556 contains a yfp cassette that is directed by the Zea mays Ubiquitin 1 promoter and flanked by the Zea mays 3 'per 5 untranslated region, the selectable marker consists of the Zea mays Ubiquitin 1 promoter that is used to target expression of aad-1 and is flanked by the 3 'untranslated Lipase region of Zea mays. pDAB107698 contains a dgt-28 cassette that is directed by the Zea mays Ubiquitin 1 promoter and is flanked by a 3 'untranslated region of Zea mays Lipase, a yfp cassette that is directed by the Zea mays Ubiqutin 1 promoter. and flanked by the Zea mays 3 'per 5 untranslated region, the selectable marker cassette consists of the promoter of the sugarcane bacilliform virus which is used to target the expression of aad-1 and is flanked by the 3' untranslated region of Lipase from Zea mays. All three of these constructs are standard binary vectors.
Table 17. Corn Transformation Vectors
Plasmid No. FIG. At the: Description of Gene Elements pDAB 107663 35 Binary vector ZmUbi1 / TraP4 dgt-28 / ZmLip 3'UTR :: ZmUbi1 / aad-1 / ZmLip 3'UTR pDAB107664 36 Binary vector ZmUbi1 / TraP8 dgt-28 / ZmLip 3'UTR :: ZmUbil / aad-1 / ZmLip 3'UTR pDAB107665 37 Binary vector ZmUbi1 / TraP23 dgt-28 / ZmLip 3'UTR :: ZmUbil / aad-1 / ZmLip 3'UTR pDAB 107666 38 Binary vector ZmUbil / TraP5 dgt-28 / ZmLip 3'UTR :: ZmUbil / aad-1 / ZmLip 3'UTR
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Plasmid No. FIG. At the: Description of Gene Elements pDAB109812 39 Binary vector ZmUbi1 / y / p / ZmPer5 3'UTR ::SCBV / aad-1 / ZmLip 3'UTR pDAB101556 40 Binary vector ZmUbi1 / y / p / ZmPer5 3'UTR :: ZmUbil / aad-1 / ZmLip 3'UTR pDAB107698 41 ZmUbi1 / TraP8 dgf-28 / ZmLip 3'UTR :: ZmUbi1 / y / p / ZmLip 3'UTR :: SCBV / aad-1 / ZmLip 3'UTR pDAB108384 42 Superbinary vector ZmUbil / TraP4 dgt28 / ZmLip 3'UTR :: ZmUbil / aad-1 / ZmLip 3'UTR pDAB108385 43 Superb precursor ZmUbi1 / TraP8 dgt28 / ZmLip 3'UTR :: ZmUbil / aad-1 / ZmLip 3'UTR pDAB108386 44 Superbinary precursor ZmUbi1 / TraP23 dgt28 / ZmLip 3'UTR :: ZmUbil / aad-1 / ZmLip 3’UTR pDAB108387 45 Superbinary precursor ZmUbil / TraP5 dgt28 / ZmLip 3'UTR :: ZmUbi1 / aad-1 / ZmLip 3'UTR
Ear sterilization and embryo isolation. To obtain immature corn embryos, plants of the Zea mays b104 crossbreeding strain were grown in the greenhouse and were self-pollinated or sibpolinated to produce ears. The ears were harvested approximately 9-12 5 days after pollination. On the day of the experiment, the ears were sterilized on the surface by immersion in a 20% sodium hypochlorite solution (5%) and stirred for 20-30 minutes, followed by three rinses in sterile water. After sterilization, immature zygotic embryos (1.5-2.4 mm) were aseptically dissected from each ear and randomly distributed into 10 microcentrifuge tubes containing liquid infection media (LS Basal
Medium, 4.43 gm / L; N6 Vitamin Solution [1000XJ; 1.00 mL / L; L-proline, 700.0 mg / L; Sucrose, 68.5 gm / L; (D) + Glucose, 36.0 gm / L; 10 mg / ml 2,4-D, 150 pL / L). For a given set of experiments, embryos grouped from three ears were used for each transformation.
Start of Agrobacterium Culture:
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Glycerol stocks of Agrobacterium containing the binary transformation vectors described above were streaked onto plates of minimal AB medium containing appropriate antibiotics and were grown at 20 ° C for 3-4 days. A single colony was taken and streaked onto YEP plates containing the same antibiotics and incubated at 28 ° C for 1-2 days.
Culture and Coculture of Agrobacterium. Agrobacterium Joram colonies picked up from the YEP plate, suspended in 10 ml_ of infection medium in a 50 ml disposable tube and the cell density was adjusted to 0.2-0.4 nm ODeoo using a spectrophotometer. Agrobacterium cultures were placed on a rotary shaker at 125 rpm, at room temperature, while embryo dissection was performed. Immature zygotic embryos between 1.5-2.4 mm in size were isolated from sterilized corn kernels and placed in 1 mL of infection medium) and washed once in the same medium. The Agrobacterium suspension (2 mL) was added to each tube and the tubes were placed on a shaking platform for 10-15 minutes. The embryos were transferred to co-culture medium (MS Salts, 4.33 gm / L; L-proline, 700.0 mg / L; Myo-inositol, 100.0 mg / L; Enzymatic casein hydrolyzate 100.0 mg / L; Dicamba-KOH 30 mM, 3.3 mg / L; Sucrose, 30.0 gm / L; Gelzan®, 3.00 gm / L; Modified Vitamin-MS [1000X], 1.00 ml / L ; 8.5 mg / ml AgNo3, 15.0 mg / L; DMSO, 100 μΜ), oriented with the scutellum facing upwards and incubated at 25 ° C, under 24 hour light and 50 pmole m ' ² sec' ¹ de light intensity for 3 days.
Callus Selection and Putative Event Regeneration. Following the co-culture period, the embryos were transferred to resting medium (MS Salts, 433, gm / L; L-proline, 700.0 mg / L; 1,2,3,5 / 4,6Hexahydrocyclohexane, 100 mg / L; MES [(2- (n-morpholino) -ethanesulfonic acid), free acid] 0.500 gm / L; Enzymatic casein hydrolyzate 100.0 mg / L; Dicamba-KOH 30 mM, 3.3 mg / L ; Sucrose, 30.0 gm / L; Gelzan 2.30 gm / L; Modified MS Vitamin [1000X], 1.00 ml / L; 8.5 mg / ml AgNo3, 15.0 mg / L; Carbenicillin, 250 , 0 mg / L) without selective agent and incubated under 24 hours of light at 50 pmole m ' ² sec' ¹ of light intensity and at 25 ° C for 3 days.
Growth inhibition dosage response experiments
112/161 suggested that glyphosate concentrations of 0.25 mM and higher were sufficient to inhibit cell growth in the untransformed B104 corn line. The embryos were transferred to Selection 1 medium containing 0.5 mM Glyphosate (MS Salts, 4.33 gm / L; L-proline, 700.0 mg / L; Myoinositol, 100.0 mg / L; MES [(acid 2 - (n-morpholino) -ethanesulfonic), free acid] 0.500 gm / L; Enzymatic casein hydrolyzate 100.0 mg / L; DicambaKOH 30 mM, 3.3 mg / L; Sucrose, 30.0 gm / L; Gelzan ® 2.30 gm / L; Modified MS Vitamin [1000X], 1.00 ml / L; 8.5 mg / ml AgNo ₃ , 15.0 mg / L; Carbenicillin, 250.0 mg / L) and incubated or in the dark and / or under light 24 hours at 50 pmole m ' ² sec' ¹ light intensity for 7-14 days at 28 ° C.
Proliferating embryonic calluses were transferred to Selection 2 medium containing 1.0 mM glyphosate (MS Salts, 4.33 gm / L; 1,2,3,5 / 4,6Hexahydrocyclohexane, 100 mg / L; L-proline, 700 , 0 mg / L; MES [(2- (nmorpholino) -ethanesulfonic acid), free acid] 0.500 gm / L; Enzymatic casein hydrolyzate 100.0 gm / L; Dicamba-KOH 30 mM, 3.3 mg / L ; Sucrose, 30.0 mg / L; Gelzan® 2.30 gm / L; Modified MS Vitamin [1000X], 1.00 ml / L; 8.5 mg / mL AgNo3, 15.0 mg / L; Carbenicillin, 250.0 mg / L; R-Haloxifope acid 0.1810 mg / L) and were incubated either in the dark and / or under light for 24 hours at 50 pmole m ^-2 sec ' ¹ of light intensity for 14 days at 28 ° C. This selection step allowed the GM callus to proliferate more and differentiate. The callus selection period lasted three to four weeks.
Embryogenic calluses, in proliferation, were transferred to PreReg medium containing 0.5 mM glyphosate (MS Salts, 4.33 gm / L; 1,2,3,5 / 4,6Hexahydrocyclohexane, 100 mg / L; L-proline, 350 , 0 mg / L; MES [(2- (nmorpholino) -ethanesulfonic acid), free acid] 0.25 gm / L; Enzymatic casein hydrolyzate 50.0 mg / L; NAA-NaOH 0.500 mg / L; ABA- EtOH 2.50 mg / L; BA 1.00 mg / L; Sucrose, 45.0 gm / L; Gelzan® 2.50 gm / L; Modified MS Vitamin [1000X], 1.00 ml / L; 8, 5 mg / ml AgNo ₃ , 1.00 mg / L; Carbenicillin, 250.0 mg / L) and cultured under light for 24 hours at 50 pmol m ' ² sec' ¹ of light intensity for 7 days at 28 ° C .
Embryogenic calluses with branch-type buds were transferred to Regeneration Medium containing 0.5 mM glyphosate (MS Salts, 4.33 gm / L;
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1,2,3,5 / 4,6-Hexahydrocyclohexane, 100.0 mg / L; Sucrose, 60.0 gm / L; Gellan Gum G434® 3.00 gm / L; Modified MS-Vitamin [1000X], 1.00 ml / L; Carbenicillin, 125.0 mg / L) and cultured under light for 24 hours at 50 pmole m ' ² sec ¹ of light intensity for 7 days.
Small branches with primary roots were transferred to rooting medium (MS Salts, 4.33 gm / L; Modified MS-Vitamin [1000X], 1.00 ml / L; 1,2,3,5 / 4,6-Hexahydrocyclohexane , 100 mg / mL; Sucrose, 60.0 gm / L; Gellan Gum G434® 3.00 gm / L; Carbenicillin, 250.0 mg / L) in phyto-trays and were incubated under 16/8 h light / dark at 140 -190 pmole at ιτΓ ² sec ^-1 of light intensity for 7 days at 27 ° C. Putative transgenic seedlings were analyzed for transgene copy number using the protocols described above and transferred to the soil.
Molecular confirmation of the Presence of transgenes dgt-28 and aad-1 within Maize Plants. The presence of the polynucleotide sequences dgt-28 and aad-1 was confirmed through hydrolysis probe assays. Isolated T _o corn plants were initially evaluated using a hydrolysis probe assay, analogous to TAQMAN®, to confirm the presence of aad-1 and dgt-28 transgenes. The data generated from these studies were used to determine the transgene copy number and used to select transgenic maize events for backcrossing and advancement for the Ti generation.
Tissue samples were collected in 96-well plates, tissue maceration was performed with a KLECO® tissue sprayer and stainless steel beads (Hoover Precision Products, Cumming, GA) in Qiagen® RLT buffer. Following tissue maceration, the genomic DNA was isolated in a high yield format using the Biosprint 96® Plant kit (Qiagen, Germantown, MD) according to the protocol suggested by the manufacturer). Genomic DNA was quantified using the Quant-IT® Pico Green DNA test kit (Molecular Probes, Invitrogen, Carlsbad, CA). Quantified genomic DNA was adjusted to around 2 ng / pL for the hydrolysis probe assay using a BIOROBOTT3000® automatic liquid handler (Qiagen, Germantown, MD). Determination of the copy number of transge
114/161 ne through the hydrolysis probe assay, analogous to the TAQMAN® assay, was performed through real-time PCR using the LIGHTCYCLER® 480 system (Roche Applied Science, Indianapólis, IN). The assays were designed for aad-1, dgt-28 and an invertase internal reference gene (Genbank Accession No.: U16123.1) using LIGHTCYCLER® Probe Design Software 2.0. For amplification, LIGHTCYCLER® 480 Probes Master mix (Roche Applied Science, Indianapolis, IN) was prepared in a final 1X concentration in a 10 pL volume multiplex reaction containing 0.4 pM of each primer for aad-1 and dgt-28 and 0.2 pM from each probe (Table 18).
A two-stage amplification reaction was performed with an extension at 60 ° C for 40 seconds with fluorescence acquisition. All samples were activated and the average Cycle Threshold (Ct) values were used for analysis of each sample. Real-time PCR data analysis was performed using LightCycler® software release 1.5 using the relative quant module and is based on the AACt method. Controls included a sample of genomic DNA from a single copy calibrator and checking two known copies that were included in each round. Table 19 lists the results of the hydrolysis probe assays.
Table 18. Primer and probe sequences used for aad-1, dgt-28 hydrolysis probe assay and internal reference (Invertase) ___
Oligonucleotide name Gene Detected SEQ IDAT THE: String Oligo GAAD1F advanced primer aad-1 58 TGTTCGGTTCCCTCTACCAA GAAD1P aad-1 probe 59 CACAGAACCGTCGCTTCAGCAACA GAAD1R Primer reverse aad-1 60 CAACATCCATCACCTTGACTGA IV-Probe Invert probeif 61 CGAGCA-GACCGCCGTGTACTTC-TACC IVF-Taq Invertase Advanced Primer 62 TGGCGGACGACGACTTGT
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Oligonucleotide name Gene Detected SEQ IDAT THE: String Oligo IVR-Taq Reverse primerInvertase 63 AAAGTTTG-GAGGCTGCCGT zmDGT28 F Advanced primer dgt-28 64 TTCAGCACCCGTCAGA-AT zmDGT28FAM Dgt-28 probe 65 TGCCGAGAACTTGAG-GAGGT zmDGT28 R Reverse primer dgt-28 66 TGGTCGCCATAGCTTGT
Table 19. To copy quantity results for dgt-28 events. Low copy number events consisted of 1-2 copies of transgene, single copy numbers are listed in parentheses. High copy number events contained 3 or more GM copies
Plasmid used for transformation No. of Low Copy Events (single copy) No. of Events withLots of Copy pDAB107663 43 (31) 10 pDAB 107664 30 (24) 5 pDAB107665 40 (27) 10 pDAB107666 24 (12) 12 pDAB109812 2 (1) 0 pDAB101556 25 (15) 10 pDAB107698 3 (1) 2
Tolerance to Herbicide in Maize Transformed with dgt-28. E10 dgt-28 transformation winds from Zea mays (T _o ) were allowed to acclimatize in the greenhouse and were grown until the plants had transitioned from tissue culture to greenhouse growing conditions (ie 2-4 leaves of normal appearance, new, that had emerged from the flower). The plants were grown at 27 ° C under conditions of 16 hours of light: 8 hours of darkness in the greenhouse. The plants were then treated with commercial formulations of DURANGO DMA® (containing the herbicide glyphosate) with the addition of 2% w / v ammonium sulfate. Herbicide applications were made with the strip sprayer at a spray volume of 187 L / ha, spray height 50 cm. T _o plants were sprayed with glyphosate range of 280-4480 g ae / ha of glyphosate, which is capable of significant injury to read
116/161 unprocessed corn flours. A lethal dose is defined as the rate that causes 95% of injury to the B104 crossing.
The results of the maize plants dgt T-28 showed that _the glyphosate tolerance has been achieved at rates up to 4480 g ae / ha. A specific type of medium was used in the T _o generation. Minimal atrophy and general plant growth of transformed plants compared to untransformed controls demonstrated that dgt-28 provides robust tolerance to glyphosate when bound to the chloroplast transit peptides TraP5, TraP8 and TraP23.
Selected To plants are self-cross or back-cross for further characterization in the next generation. 100 strains of dgt-28 chosen containing the Ti plants are sprayed with 140-1120 g ae / ha of glufosinate or 105-1680 gha of glyphosate. Both glyphosate-resistant and selectable marker genes are constructed on the same plasmid. In this way, if a herbicide-tolerant gene is selected by spraying with an herbicide, both genes are believed to be present. In 14 DAT, resistant and sensitive plants are counted to determine the percentage of strains that segregated as a single site, a dominant Mendelian characteristic (3R: 1S) as determined through Chi square analysis. These data demonstrate that dgt-28 is inheritable as a robust glyphosate resistance gene in a monocot species. High rates of glyphosate are applied to Ti or Fi survivors to further characterize the tolerance and protection that are provided by the dgt-28 gene.
Post-emergence herbicide tolerance in To corn transformed with dgt-28. Events T-28 dgt _the ligated with TraP4, TraP5, and TraP9 TraP23 were generated by transformation with Agrobacterium and were allowed to acclimate growth chamber under controlled conditions until the 2-4 leaf normal appearance, new, had emerged flower . The plants received individual identification numbers and were sampled for copy number analyzes of both dgt-28 and aad-1. Based on copy number analyzes, plants were selected for analysis
117/161 of protein expression. The plants were transplanted into larger pots with new growth medium and grown at 27 ° C under conditions of 16 hours of light: 8 hours of darkness in the greenhouse. The remaining plants that were not sampled for protein expression were then treated with commercial formulations of DURANGO DMA® (glyphosate) with the addition of 2% ammonium sulfate w / v. The treatments were distributed so that each group of plants containing T _the event variable copy number. Herbicide applications were made with a strip sprayer at a spray volume of 187 L / ha, spray height 50 cm. T _o plants were sprayed with glyphosate range from 2804480 g ae / ha of glyphosate capable of significant injury to non - transformed corn lines. A lethal dose is defined as the rate that causes> 95% of injury to the B104 crossing. B104 was the genetic basis of the transformants.
The results of corn plants dgt-28 T show that _the tolerance to glyphosate was obtained 4480 g ae / ha. Minimal stunting and general plant growth of transformed plants compared to untransformed controls demonstrated that dgt-28 provides robust protection to glyphosate when linked to TraP5, TraP8 and TraP23.
Table 20. Response of dgt-28 T ^ events from variable copy numbers to glyphosate rates ranging from 280-4480 q ae / ha + 2.0% w / v ammonium sulfate 14 days after treatment_________
TraP4 dgt-28 % Lesion % Lesion Application Fee <20% 20-40% > 40% Average Standard deviation Banner(%) 0 g ae / ha glyphosate 4 0 0 0.0 0.0 0 280 g ae / ha 5 0 0 1.0 2.2 0-5 560 g ae / ha 6 0 0 2.0 4.0 0-10 1120 g ae / ha 12 0 0 1.3 3.1 0-10 2240 g ae / ha 7 0 0 1.7 4.5 0-12 4480 g ae / ha 7 0 0 1.1 3.0 0-8 TraP8 dgt-28 % Lesion % Lesion
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Application Fee <20% 20-40% > 40% Average Standard deviation Banner(%) 0 g ae / ha glypho-sato 6 0 0 0.0 0.0 0 280 g ae / ha 5 1 0 6.7 8.8 0-20 560 g ae / ha 0 2 0 20.0 0.0 20 1120 g ae / ha 7 0 0 1.4 2.4 0-5 2240 g ae / ha 3 1 0 7.5 15.0 0-30 4480 g ae / ha 6 0 0 1.7 4.1 0-10 TraP23 dgt-28 % Lesion % Lesion Application Fee <20% 20-40% > 40% Average Standard deviation Banner(%) 0 g ae / ha glyphosate 6 0 0 0.8 2.0 0-5 280 g ae / ha 7 0 0 0.0 0.0 0 560 g ae / ha 4 0 0 1.3 2.5 0-5 1120 g ae / ha 10 2 0 3.3 7.8 0-20 2240 g ae / ha 6 0 0 1.3 3.3 0-8 4480 g ae / ha 6 1 0 4.3 7.9 0-20 TraP5 dgt-28 % Lesion % Lesion Application Fee <20% 20-40% > 40% Average Standard deviation Banner(%) 0 g ae / ha glyphosate 4 0 0 0.0 0.0 0 280 g ae / ha 7 1 0 5.0 14.1 0-40 560 g ae / ha 8 0 0 0.6 1.8 0-5 1120 g ae / ha 7 1 0 5.0 14.1 0-40 2240 g ae / ha 8 0 0 0.0 0.0 0 4480 g ae / ha 8 0 0 0.0 0.0 0
Analyzes of protein expression by standard ELISA demonstrated an average DGT-28 protein range of 12.6-22.5 ng / cm ² in the tested constructs.
Confirmation of tolerance to glyphosate in the Fi generation under greenhouse conditions. Single copy T _o plants that were not sprayed were backcrossed with the B104 untransformed base for further characterization in the next generation. In the Ti generation, glyphosate tolerance was assessed
119/161 to confirm the inheritance of the dgt-28 gene. For Τ _Ί plants, the herbicide ASSURE II® (35 g ae / ha of quizalofope-methyl) was applied in growth stage VI to select the AAD-1 protein. Both the selectable marker and glyphosate resistant gene are constructed on the same plasmid. In this way, if a gene is selected, both genes are believed to be present. After 7 DAT, resistant and sensitive plants were counted and null plants were removed from the population. These data demonstrate that dgt-28 (v1) is inheritable as a robust glyphosate resistance gene in a monocot species. The plants were sampled for DGT-28 protein characterization by standard ELISA and RNA transcript level. Resistant plants were sprayed with 560-4480 g ae / ha of glyphosate as previously described. The data demonstrate robust tolerance of dgt-28 linked to chloroplast transit peptides TraP4, TraP5, TraP8 and Trap23 up to 4480 g ae / ha of glyphosate. Table 21.
Table 21. Response of single copy dgt-28 events to rates of qlifosate ranging from 560-4480 q ae / ha + 2.0% ammonium sulfate w / v 14 days after treatment__
B104 / TraP4 :: ógtf-28 % Lesion % Lesion Application Fee <20% 20-40% > 40% Average Standard deviation Banner(%) 0 g ae / ha glyphosate 4 0 0 0.0 0.0 0 560 g ae / ha 4 0 0 0.0 0.0 0 1120 g ae / ha 4 0 0 9.0 1.2 8-10 2240 g ae / ha 4 0 0 2.5 2.9 0-5 4480 g ae / ha 4 ⁰ 0 0.0 0.0 0 B104 / TraP8 :: dgt-28 % Lesion % Lesion Application Fee <20% 20-40% > 40% Average DetourPattern Banner(%) 0 g ae / ha glyphosate 4 0 0 0.0 0.0 0 560 g ae / ha 4 0 0 1.3 2.5 0-5 1120 g ae / ha 4 0 0 0.0 0.0 0 2240 g ae / ha 4 0 0 5.0 4.1 0-10
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4480 g ae / ha 4 0 0 6.3 2.5 5-10 B104 /TraP23 :: dg / -28 % Lesion % Lesion Application Fee <20% 20-40% > 40% Average DetourPattern Banner(%) 0 g ae / ha glyphosate 4 0 0 0.0 0.0 0 560 g ae / ha 3 1 0 10.0 10.0 5-25 1120 g ae / ha 2 2 0 18.8 11.8 10-35 2240 g ae / ha 4 0 0 12.5 2.9 10-15 4480 g ae / ha 3 1 0 10.0 7.1 5-20 B104 / TraP5 :: dgt-28 % Lesion % Lesion Application Fee <20% 20-40% > 40% Average DetourPattern Banner(%) 0 g ae / ha glyphosate 4 0 0 0.0 0.0 0 560 g ae / ha 4 0 0 8.0 0.0 8 1120 g ae / ha 4 0 0 11.3 3.0 8-15 2240 g ae / ha 4 0 0 12.5 2.9 10-15 4480 g ae / ha 4 0 0 10.0 2.5 10-15 B104 Unprocessed % Lesion % Lesion Application Fee <20% 20-40% > 40% Average DetourPattern Banner(%) 0 g ae / ha glyphosate 4 0 0 0.0 0.0 0 560 g ae / ha 0 0 4 100.0 0.0 100 1120 g ae / ha 0 0 4 100.0 0.0 100 2240 g ae / ha 0 0 4 100.0 0.0 100 4480 g ae / ha 0 0 4 100.0 0.0 100
Protein expression data demonstrate an average DGT-28 protein range from 42.2 - 88.2 ng / cm ² in the Ti events and tested constructs, establishing protein expression in the Τ _Ί generation.
Characterization of dgt-28 maize under field conditions. E5 single copy Τ _Ί winds were sent to a field location to create both hybrid and homozygous crossbreeding seeds between the same species for further characterization. Hybrid seeds fo
121/161 ram created by crossing events Ή in the B104 maize transformation line with the crossing line between the same species 4XP811 generating hybrid populations segregating 1: 1 (hemizigotes: null) for the event. The resulting seeds were transported to 2 separate locations. A total of five single copy events per construct were planted at each location in a randomized complete block design in triplicate. The fields were designed for glyphosate applications to take place in the V4 growth stage and a separate plant cluster to be applied in the V8 growth stage. The conventional hybrid 4XP811 / B104 was used as a negative control.
Experimental rows were treated with 184 g ae / ha of ASSURE II® (106 g ai / L of quizalofop-methyl) to eliminate null segregants. All experimental members segregated 1: 1 (sensitive: resistant) (p = 0.05) in relation to the application of ASSURE II®. Selected resistant plants were sampled from each event to quantify the DGT-28 protein using a standard ELISA.
Plants resistant to Quizalofope-methyl were treated with the commercial herbicide DURANGO DMA® (480 g ae / L glyphosate) with the addition of 2.5% w / v ammonium sulfate in stage V4 or V8 of growth. Herbicide applications were made with a boom spray calibrated to apply a volume of 187 L / ha, spray height of 50 cm. The plants were sprayed with a glyphosate band from 11204480 g ae / ha of glyphosate, capable of significant damage to untransformed corn lines. A lethal dose is defined as the rate that causes> 95% injury to the species of cross between the same species 4XP811. Visual injury assessments were made for the percentage of visual chlorosis, percentage of necrosis, percentage of growth inhibition and total visual injury at 7, 15 and 21 DAT (days after treatment). Evaluations were compared to untreated checks for each strain and negative controls.
Visual injury data for all assessment times demonstrated robust tolerance up to 4480 g ae / ha of DURANGO DMA® in
122/161 both places and times of application. Representative events for the V4 application are presented from one location and are in accordance with other events, application times and locations. Table 22 One construct event containing dgt-28 linked with TraP23 (pDAB107665) was tolerant for the selection of ASSURE II® for the AAD-1 protein, but was sensitive to all applied glyphosate rates.
Table 22. Response of dgt-28 events applied with a range of 1120-4480 q ae / ha qlifosate + 2.5% ammonium sulphate w / v in growth stage V4
4XPB11 // B104 / TraP4 ::dgt-28 % Lesion % Lesion Application Fee <20% 20-40% > 40% Average Standard deviation Banner(%) 0 g ae / ha glyphosate 4 0 0 0.0 0.0 0 1120 g ae / ha 4 0 0 0.0 0.0 0 2240 g ae / ha 4 0 0 0.0 0.0 0 4480 g ae / ha 4 0 0 0.0 0.0 0 4XPB11 // B104 / TraP8 ::dgt-28 % Lesion % Lesion Application Fee <20% 20-40% > 40% Average Standard deviation Banner(%) 0 g ae / ha glyphosate 4 0 0 0.0 0.0 0 1120 g ae / ha 4 0 0 0.0 0.0 0 2240 g ae / ha 4 0 0 0.0 0.0 0 4480 g ae / ha 4 0 0 0.0 0.0 0 4XPB11 // B104 / TraP23:: dgt-28 % Lesion % Lesion Application Fee <20% 1 i > 40% Average Standard deviation Banner(%) 0 g ae / ha glyphosate 4 0 0 0.0 0.0 0 1120 g ae / ha 4 0 0 0.0 0.0 0 2240 g ae / ha 4 0 0 0.0 0.0 0 4480 g ae / ha 4 0 0 0.0 0.0 0 4XPB11 // B104 / TraP5 ::dgt-28 % Lesion % Lesion Application Fee <20% 20-40% > 40% Average Standard deviation Banner(%) 0 g ae / ha glyphosate 4 0 0 0.0 0.0 0 1120 g ae / ha 4 0 0 0.0 0.0 0 2240 g ae / ha 4 0 0 0.0 0.0 0
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4480 g ae / ha 4 0 0 0.0 0.0 0 4XPB11 // B104 Unprocessed % Lesion % LesionApplication Fee <20% 20-40% > 40% Me-day Standard deviation Banner(%) 0 g ae / ha glyphosate 4 0 0 0.0 0.0 0 1120 g ae / ha 0 0 4 100.0 0.0 100 2240 g ae / ha 0 0 4 100.0 0.0 100 4480 g ae / ha 0 0 4 100.0 0.0 100
Additional assessments were made during the reproductive growth stage for the glyphosate rate of 4480 g ae / ha. Visual evaluation of fringes, pollination moment and ear filling were similar to the untreated checks of each strain for all constructs, application times and locations. Quantification results for the DGT-28 protein demonstrated an average protein expression range of from 186.4-303.0 ng / cm ² . Data demonstrate robust tolerance of corn transformed with dgt-28 under field conditions in the stages of reproductive growth of up to 4480 g ae / ha of glyphosate. The data also demonstrated detection and function of DGT-28 protein based on spray tolerance results.
Confirmation of inheritance capacity and tolerance of corn with dgt-28 in the homozygous state. TiS 2 seed was planted under greenhouse conditions as previously described. The same five single copy strains that were characterized under field conditions were characterized in the homogeneous state. The plants were grown up to the V3 growth stage and separated into three rates of glyphosate ranging from 1120-4480 g ae / ha of glyphosate (DURANGO DMA®) and four replicates per treatment. The applications were made in a strip sprayer as previously described and were formulated in 2.0% w / v ammonium sulfate. An application of ammonium sulfate served as an untreated check for each strain. Visual assessments were made 7 and 14 days after treatment as previously described. The data shows robust tolerance of up to 4480 g ae / ha of glyphosate for all events tested. Table 23.
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Table 23. Event response of homozygous dgt-28 applied with a glyphosate range from 1120-4480 q ae / ha + 2.0% w / v ammonium sulfate
TraP4 :: dgt-28 % Lesion % LesionApplication Fee <20% 20-40% > 40% Average DetourPattern Banner(%) 0 g ae / ha glyphosate 4 0 0 0.0 0.0 0 1120 g ae / ha 4 0 0 0.0 0.0 0 2240 g ae / ha 4 0 0 3.8 2.5 0-5 4480 g ae / ha 4 0 0 14.3 1.5 12-15 TraP8:: dgt-28 % Lesion % LesionApplication Fee <20% 20-40% > 40% Average Standard deviation Banner(%) 0 g ae / ha glyphosate 4 0 0 0.0 0.0 0 1120 g ae / ha 4 0 0 0.0 0.0 0 2240 g ae / ha 4 0 0 9.0 1.2 8-10 4480 g ae / ha 4 0 0 11.3 2.5 10-15 TraP23:: dgt-28 % Lesion % LesionApplication Fee <20% 20-40% > 40% Average Standard deviation Banner(%) 0 g ae / ha glyphosate 4 0 0 0.0 0.0 0 1120 g ae / ha 4 0 0 4.5 3.3 0-8 2240 g ae / ha 4 0 0 7.5 2.9 5-10 4480 g ae / ha 4 0 0 15.0 0.0 15 TraP5:: dgt-28 % Lesion % LesionApplication Fee <20% 20-40% > 40% Average DetourPattern Banner(%) 0 g ae / ha glyphosate 4 0 0 0.0 0.0 0 1120 g ae / ha 4 0 0 1.3 2.5 0-5 2240 g ae / ha4480 g ae / ha 44 00 00 9.015.0 2.02.4 8-1212-18 B104 Unprocessed % Lesion % LesionApplication Fee <20% 20-40% > 40% Average DetourPattern Banner(%) 0 g ae / ha glyphosate 4 0 0 0.0 0.0 0 1120 g ae / ha 0 0 4 100.0 0.0 100
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2240 g ae / ha 0 0 4 100.0 0.0 100 4480 g ae / ha 0 0 4 100.0 0.0 100
The pDAB107665 strain that was not tolerant under field conditions did not demonstrate any tolerance to glyphosate and therefore according to field observations (data not shown). With the exception of the lineage mentioned above, all replicas that were treated with glyphosate from the lineages were not sensitive to glyphosate. In this way, the data demonstrate inheritance capacity for a homogeneous population of dgt-28 maize in a Mendelian way. Expression of the DGT28 protein by standard ELISA demonstrated an average protein expression range of from 27.5-65.8 ng / cm ² in single copy events that were tolerant to glyphosate. Data demonstrate functional protein and stability of the DGT-28 protein across generations.
Use of tolerance to post-emergence glyphosate herbicide as a selectable marker. As previously described, transformed To plants were taken from tissue culture and acclimated in the greenhouse. The events tested contained dgt-28 linked to chloroplast transit peptides TraP5, TraP8 and TraP23. These To plants have been shown to provide robust tolerance up to 4480 g ae / ha of glyphosate, and unprocessed plants have been controlled with glyphosate at concentrations as low as 280 g ae / ha. These data demonstrate that dgt-28 can be used as a selectable marker using a concentration of glyphosate ranging from 280-4480 g ae / ha.
Several seeds of fixed maize strains that contained the dgt-28 transgene are sprinkled on several unprocessed corn seeds. The seeds are planted and allowed to grow to the developmental stage V1-V3, when the seedlings are sprayed with a selection dose of glyphosate in the range of 280-4480 g ae / ha. Following 710 days, sensitive and resistant plants are counted, and the amount of glyphosate-tolerant plants is related to the original number of transgenic seeds containing the dgt-28 transgene that are planted.
Stacking corn dgt-28. The AAD-1 protein is used as
126/161 the selectable marker in corn transformed with dgt-28 for research purposes. The aad-1 gene can also be used as a herbicide-tolerant trait in maize to provide robust 2,4-D tolerance up to a V8 application in a crop. Four events of the constructs pDAB107663 (TraP4 :: dgt-28), pDAB107664 (TraP8 :: dgt-28) and pDAB107666 (TraP5 :: dgt-28) were characterized for the tolerance of a glyphosate and 2 tank mix application, 4-D. The characterization study was completed with Fi seed under greenhouse conditions. The applications were made in a strip sprayer as previously described in the following rates: 1120-2240 g ae / ha of glyphosate (selective for the dgt28 gene), 1120-2240 g ae / ha 2,4-D (selective for the aad-1 gene) or a tank mixture of the two herbicides at the rates described. The plants were classified into 7 and 14 DAT. Spray results for herbicide applications at 2240 g ae / ha are shown in Table 24.
Table 24. Response of aad-1 and dgt-28 Fi_pulverized corn with 2240 q ae / ha of 2,4-D, glyphosate and a combination of tank mix of the two nerbicides 14 days after treatment
Ft Event 2240 g ae / ha 2,4-D 2240 g ae / ha glyphosate 2240 g ae / ha 2,4D + 2240 g ae / ha glyphosate % Average Injury Standard deviation % Average Injury Standard deviation % Average Injury Standard deviation 107663 [3] -012.AJ001 5.0 4.1 3.8 4.8 8.8 3.0 107663 [3J-029.AJ001 2.5 5.0 1.3 2.5 5.0 5.8 107663 [3] -027.AJ001 2.5 2.9 11.8 2.9 13.8 2.5 107663 [3] -011, AJ001B104 3.8 2.5 11.5 1.0 12.8 1.5 27.5 17.7 100.0 0.0 100.0 0.0
The results confirm that dgt-28 can be successfully stacked with aad-1, thus increasing the spectrum herbicides that can
127/161 must be applied to the culture of interest (glyphosate + phenoxyacetic acids for dgt-28 and aad-1, respectively). In corn products where it is difficult to control broadleaf weeds or resistant weed biotypes, the pile can be used as a means of controlling weed and protecting the crop of interest. Additional input or output characteristics can also be stacked with the dgt-28 gene in corn and other plants.
Soy Transformation. Transgenic soybeans (Glycine max) containing a stg integrated dgt-28 transgene was generated through Agrobacterium-mediated transformation of soybean cotyledonary knot explants. An unarmed Agrobacterium strain carrying a binary vector containing a functional dgt-28 was used to initiate transformation.
Agrobacterium-mediated transformation was performed using a cotyledonary knot procedure modified by Zeng and others (Zeng, P., Vadnais, DA, Zhang, Z., Polacco, JC, (2004), Plant Cell Rep., 22 (7 ): 478-482). In short, soybean seeds (cv. Maverick) were germinated in a basal medium and cotyledon nodes are isolated and infected with Agrobacterium. Means of beginning of the branch, branch elongation and rooting are supplemented with cefotaxime, timentin and vancomycin to remove Agrobacterium. Selection using a herbicide was used to inhibit the growth of untransformed branches. Selected branches are transferred to rooting medium for root development and then transferred to soil mixture to acclimatize seedlings.
Terminal leaflets of selected seedlings were treated topically (leaf painting technique) with an herbicide to evaluate putative transformants. The evaluated seedlings were transferred to the greenhouse, allowed to acclimate and then the leaf painted with a herbicide to reconfirm tolerance. These T _the putative transformed plants were sampled and molecular analysis was used to confirm the presence of the herbicide selectable marker and the transgene dgt-28. T plants were allowed autofertilizar in the greenhouse to produce seed T |.
A second soybean processing method can be used
128/161 to produce additional transgenic soybean plants. A disarmed Agrobacterium strain carrying a binary vector containing a functional dgt-28 is used to initiate transformation.
Agrobacterium-mediated transformation was performed using a seed procedure by the modified half of Paz and others (Paz, M., Martinez, J., Kalvig, A., Fonger, T. and Wang, K., (2005) Plant Cell Rep ., 25: 206-213). In short, ripe soybean seeds were sterilized overnight with chlorine gas and soaked with sterile H ₂ O twenty hours before Agrobacterium-mediated plant transformation. The seeds were cut in half with a longitudinal cut along the entrance to separate the seed and remove the seed coating. The embryonic axis was excised and any axial branches / shoots were removed from the cotyledonary node. The resulting half-seed explants were infected with Agrobacterium. Means of branch start, branch lengthening and rooting were supplemented with cefotaxime, timentin and vancomycin to remove Agrobacterium. Herbicide selection was used to inhibit the growth of unprocessed shoots. The selected shoots were transferred to rooting medium for root development and then transferred to soil mixture to acclimatize seedlings.
Plants transformed _the putative T were sampled and molecular analysis was used to confirm the presence of the selectable marker and the dgt-28 transgene. Several events have been identified as containing the transgenes. These T _o plants were advanced for further analysis and left to self-fertilize in the greenhouse to give rise to the T- | seed.
Confirmation of the inheritance capacity of dgt-28 for the Ty generation The inheritance capacity of the DGT-28 protein for the generation was evaluated in one of two ways. The first method included planting the Ti seed in a Metro-mix medium and applying 411 g ae / ha of IGNITE® 280 SL to plants germinated in the first stage of three-leaf growth. The second method consisted of seed homogenization for a total of 8 replicates using a bearing and a genogrinder. ELISA tape tests for
129/161 r to detect the PAT protein were then used to detect inheritance events since the selectable marker was on the same plastid as dgt-28. For any method if a single plant was tolerant to glufosinate or was detected with an ELISA PAT strip test, the event demonstrated an inheritance capacity for the T- | generation.
A total of five constructs were assessed for inheritance capacity as previously described. The plasmids contained dgt-28 linked with TraP4, TraP8 and TraP23. The events in the constructs demonstrated 68% inheritance capacity of the PAT :: DGT-28 protein for the T- | generation.
Post-emergence herbicide tolerance in T ^ soybean transformed with dgt-28. Seeds of Ti events that were determined to be heritable through the evaluation methods previously described were planted in a Metro-mix medium under greenhouse conditions. The plants were grown until ^the first trifoliato were fully expanded and treated with 411 g ae / ha to 280 SL Ignite® pat gene selection as described above. Resistant plants from each event received unique identifiers and sampled for zygality analyzes of the dgt-28 gene. Zygosity data were used to designate 2 hemizigote replicas and 2 homozygous replicates at each applied glyphosate rate allowing a total of 4 replicates per treatment when sufficient plants existed. These plants were compared with wild type Petite havana tobacco. All plants were sprayed with an 187 L / ha strip sprayer. The plants were sprayed from a range of 560-4480 g ae / ha of DURANGO® dimethiamine (DMA) salt. All applications were formulated in water with the addition of 2% w / v ammonium sulfate (AMS). The plants were evaluated at 7 and 14 days after treatment. The plants received a lesion classification with respect to general visual atrophy, chlorosis and necrosis. The Ti generation is segregating, so some variable response is expected due to the difference in zigosity.
Table 25. Spray results show that in 14 PAT (days after treatment) robust tolerance of up to 4480 q ae / ha of glyphosate of at least one dgt-28 event per construct characterized. Copy events
130/161 only representative of the constructs all provided tolerance of up to 4480 q ae / ha compared with the Maverick negative control
pDAB107543 (TraP4:: dgt-28) % Lesion % Lesion Application Fee <20% 20-40% > 40% Average DetourPattern Banner(%) 0 g ae / ha glyphosate 4 0 0 0.0 0.0 0 560 g ae / ha 0 4 0 33.8 7.5 25-40 1120 g ae / ha 2 2 0 25.0 11.5 15-35 2240 g ae / ha 2 2 0 17.5 2.9 15-20 4480 g ae / ha 0 2 2 33.8 13.1 20-45 pDAB107545 (TraP8:: dgt-28) % Lesion % Lesion Application Fee <20% 20-40% > 40% Average DetourPattern Banner(%) 0 g ae / ha glyphosate 4 0 0 0.0 0.0 0 560 g ae / ha 4 0 0 1.5 1.0 0-2 1120 g ae / ha 4 0 0 2.8 1.5 2-5 2240 g ae / ha 4 0 0 5.0 2.4 2-8 4480 g ae / ha 4 0 0 9.5 1.9 8-12 pDAB107548(TraP4 :: dg / -28) % Lesion % Lesion Application Fee <20% 20-40% > 40% Average Standard deviation Banner(%) 0 g ae / ha glyphosate 4 0 0 0.0 0.0 0 560 g ae / ha 4 0 0 1.8 2.4 0-5 1120 g ae / ha 4 0 0 2.8 1.5 2-5 2240 g ae / ha 4 0 0 3.5 1.7 2-5 4480 g ae / ha 4 0 0 8.8 3.0 5-12 pDAB107553 (TraP23: .dgt-28) % Lesion % Lesion Application Fee <20% 20-40% > 40% Average DetourPattern Banner(%) 0 g ae / ha glyphosate 4 0 0 0.0 0.0 0 560 g ae / ha 4 0 0 5.0 0.0 5 1120 g ae / ha 4 0 0 9.0 1.2 8-10
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2240 g ae / ha 4 0 0 10.5 1.0 10-12 4480 g ae / ha 4 0 0 16.5 1.7 15-18 Maverick (negative control) % Lesion % Lesion Application Fee <20% 20-40% > 40% Average DetourPattern Banner(%) 0 g ae / ha glyphosate 4 0 0 0.0 0.0 0 560 g ae / ha 0 0 4 82.5 12.6 70-100 1120 g ae / ha 0 0 4 100.0 0.0 100 2240 g ae / ha 0 0 4 100.0 0.0 100 4480 g ae / ha 0 0 4 100.0 0.0 100
Protection of dgt-28 against high glyphosate rates in T ₂ generation. A progeny test of 45 plants was conducted on two to five T ₂ lines of dgt-28 per construct. Homozygous strains were chosen based on zygosity analyzes completed in the previous generation.
The seeds were planted as previously described. The plants were then sprayed with 411 g ae / ha of IGNITE 280 SL for the selection of selectable markers pat as previously described. After 3 DAT, resistant and sensitive plants were counted. For constructs containing TraP4 linked with dgt-28 (pDAB107543 and pDAB107548), nine out of twelve tested strains did not segregate, thus confirming homogeneous strains in the T ₂ generation. Strains containing TraP8 linked with dgt-28 (pDAB107545) demonstrated two of the four strains without any segregants and demonstrating Mendelian inheritance in at least two generations of dgt-28 in soybean. Tissue samples were obtained from resistant plants and the DGT-28 protein was quantified using standard ELISA methods. Data demonstrated an average DGT-28 protein range of 32.8107.5 ng / cm ² for non-segregating T ₂ strains tested. Strains of the construct pDAB107553 (TraP23 :: dgt-28) were not previously selected with glufosinate, and the glyphosate dose response was used as both to test for homogeneity and tolerance at high glyphosate rates. Replicas of the strains of the pDAB107553 construct were tolerant at rates ranging from 560-4480 g ae / ha of glyphosate, and were then confirmed
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be a homogeneous and heritable population for at least two generations.
Rates of DURANGO MDA ranging from 560-4480 g ae / ha of glyphosate were applied to 2-3 trifolia soybeans as previously described. Visual injury data 14 DAT confirmed the tolerance results that 5 were demonstrated in the T-f generation.
Table 26. Data demonstrate robust tolerance of dgt-28 tobacco up to 3360 q ae / ha of glyphosate in two generations, compared to untransformed control
pDAB107543 (TraP4:: dgt-28) % Lesion % Lesion Application Fee <20% 20-40% > 40% Average Standard deviation Banner(%) 0 g ae / ha glyphosate 4 0 0 0.0 0.0 0 560 g ae / ha 4 0 0 8.0 0.0 8 1120 g ae / ha 4 0 0 14.3 1.5 12-15 2240 g ae / ha 4 0 0 18.0 0.0 18 4480 g ae / ha 0 4 0 24.5 3.3 20-28 pDAB107545(TraP8 :: dgt-28) % Lesion % Lesion Application Fee <20% 20-40% > 40% Average Standard deviation Banner(%) 0 g ae / ha glyphosate 4 0 0 0.0 0.0 0 560 g ae / ha 4 0 0 0.0 0.0 0 1120 g ae / ha 4 0 0 2.8 1.5 2-5 2240 g ae / ha 4 0 0 5.0 0.0 5 4480 g ae / ha 4 0 0 10.0 0.0 10 pDAB107548(TraP4 :: dgt-28) % Lesion % Lesion Application Fee <20% 20-40% > 40% Average DetourPattern Banner(%) 0 g ae / ha glyphosate 4 0 0 0.0 0.0 0 560 g ae / ha 4 0 0 0.0 0.0 0 1120 g ae / ha 4 0 0 0.0 0.0 0
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2240 g ae / ha 4 0 0 0.0 0.0 0 4480 g ae / ha 4 0 0 10.0 0.0 10 pDAB107553(TraP23: -.dgt-28) % Lesion % Lesion Application Fee <20% 20-40% > 40% Average DetourPan-dron Banner(%) 0 g ae / ha glyphosate 4 0 0 - 0.0 0.0 560 g ae / ha 4 0 0 - 10.0 0.0 1120 g ae / ha 4 0 0 - 10.0 -4.4 2240 g ae / ha 4 0 0 - 13.0 -2.4 4480 g ae / ha 3 1 0 - 15.5 4.1 Maverick (negative control) % Lesion % Lesion Application Fee <20% 20-40% > 40% Average Standard deviation Banner(%) 0 g ae / ha glyphosate 4 0 0 0.0 0.0 0 560 g ae / ha 0 0 4 77.5 15.0 70-100 1120 g ae / ha 0 0 4 97.5 2.9 95-100 2240 g ae / ha 0 0 4 100.0 0.0 100 4480 g ae / ha 0 0 4 100.0 0.0 100
Transformation of Rice with dgt-28. Transgenic rice (Oryza sativa) containing a stg integrated dgt-28 transgene is generated through Agrobacterium-mediated transformation of sterilized rice seeds. A disarmed Agrobacterium strain carrying a binary vehicle containing a functional dgt-28 is used to initiate transformation.
Culture media are adjusted to pH 5.8 with 1 M KOH and solidified with 2.5 g / l Phytagel (Sigma-Aldrich, St. Louis, MO). Embryogenic calluses are cultured in 100 x 20 mm Petri dishes containing 30 ml of semi-solid medium. Rice seedlings are grown in 50 ml of medium 10 in MAGENTA boxes. Cell suspensions are kept in 125 ml conical flasks containing 35 ml of liquid medium and spun at 125 rpm. Induction
134/161 and maintenance of embryogenic cultures occur in the dark at 25-26 ° C and plant regeneration and integral plant culture occur in a room lit with a 16 h photoperiod (Zhang et al., 1996).
Induction and maintenance of embryogenic callus are performed in a baseline NB medium modified as previously described (Li et al., 1993), where the medium is adapted to contain 500 mg / L of glutamine. Suspension cultures are started and maintained in liquid SZ (Zhang et al., 1998) with the inclusion of 30 g / L of sucrose in place of maltose. Osmotic medium (NBO) consisting of NB medium with the addition of 0.256 M each of mannitol and sorbitol. Herbicide resistant callus is selected in NB medium supplemented with the appropriate herbicidal selective agent for 3-4 weeks. Pre-regeneration is carried out in medium (PRH50) consisting of NB medium with 2,4-dichlorophenoxyacetic acid (2,4-D), 1 mg / ml of α-naphthalenoacetic acid (NAA), 5 mg / l of abscisic acid ( ABA) and selective herbicide for 1 week. Seedling regeneration following culture in regeneration medium (RNH50) comprising NB medium containing 2,4-D, 0.5 mg / l NAA and selective herbicide until putatively transgenic shoots are regenerated. The sprouts are transferred to rooting medium with basal salts Murashige and Skoog of half resistance and vitamins B5 from Gamborg, supplemented with sucrose 1% and selective herbicide.
Mature dissected seeds of Oryza sativa L. japonica cv Taipei 309 are sterilized as described in Zhang et al., 1996. Embryogenic tissues are induced by culturing mature rice seeds in NB medium in the dark. The primary callus of approximately 1 mm in diameter is removed from the scutellum and used to initiate cell suspension in liquid SZ. The suspensions were then maintained as described in Zhang, 1996. Embryogenic tissues derived from suspension are removed from liquid culture 3-5 days after the previous subculture and placed in an NBO osmotic medium to form a circle about 2.5 cm from side to side. side in a petri dish and cultured for 4 h before bombing. Sixteen to twenty hours after bombardment, tissues are transferred from NBO medium to NBH50 selection medium, ensuring that the bombardment surface is facing upwards and incubated in the dark for 14-17 days. The newly formed callus is then separated from the original bombed explants and placed close to the same medium. After another 8-12 days, opaque callus, relatively compact, is visually identified and transferred to PRH50 pre-regeneration medium for 7 days in the dark. Growing callus, which becomes more compact and opaque, is then subcultured in RNH50 regeneration medium for a period of 14-21 days under a 16 h photoperiod. Regeneration sprouts are transferred to MAGENTA boxes containing MSG50% medium. Multiple plants regenerated 10 from a single explant are considered sisters and are treated as an independent plant strain. A plant is classified as positive for the dgt-28 gene if it produces thick white roots and grows vigorously in MSH50% medium. Once the seedlings have reached the top of the MAGENTA boxes, they are transferred to soil in a 6 cm 15 pot under 100% humidity for a week, and then they are taken to a growth chamber with a light period of 14 h 30 ° C and in the dark at 21 ° C for 2-3 weeks before transplanting into 13 cm pots in the greenhouse. Seeds are collected and dried at 37 ° C for a week prior to storage at 4 C.
To analysis of rice dgt-28. Transplanted rice transformants obtained using an Agrobacterium transformation method were transplanted into medium and acclimated to greenhouse conditions. All plants were sampled for PCR detection of dgt-28 and the results demonstrate twenty-two positive PCR events for pDAB110827 25 (JraP8 :: dgt-28) and a minimum of sixteen positive PCR events for pDAB110828 (TraP23 :: dgt-28). Southern analysis for dgt-28 of positive PCR events demonstrates simple events (1-2 copies) for both constructs. Protein Expression events selected T demonstrated protein expression bands DGT-28 from below detection levels of 30 to 130 ng / ^cm2. Events T pDAB110828 selected from _the construct were treated with 2240 g ae / ha Durango DMA® as described above and evaluated 7 and 14 days after treatment.
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The data demonstrated robust tolerance for the applied glyphosate rate. All PCR positive plants were allowed to produce T-i seed for further characterization.
Inheritance capacity of Dgt-28 in rice. A progeny test of 100 plants was conducted on four T ₁ lines of dgt-28 of construct pDAB110827 containing the chloroplast transit peptide TraP8. The seeds were planted in pots filled with medium. All plants were then sprayed with 560 g ae / ha of DURANGO DMA® for the selection of the dgt-28 gene as previously described. After 7 DAT, resistant and sensitive plants were counted. Two of the four strains tested for each construct segregated as a dominant Mendelian trait, of single locus (3R: 1S) as determined by Chi Square analysis. Dgt-28 is a gene for glyphosate resistance inheritable in multiple species.
Post-emergence herbicide tolerance in Ti rice transformed with dgt-28. Tí resistant plants from each event used in the progeny test received unique identifiers and were sampled for zigosity analyzes of the dgt-28 gene. Zygosity data were used to designate 2 hemizigote replicas and 2 homozygous replicates for each applied glyphosate rate allowing a total of 4 replicates per treatment. These plants were compared against wild type kitaake rice. All plants were sprayed with a range sprayer adjusted to 187 L / ha. The plants were sprayed from a range of 560-2240 g ae / ha of DURANGO DMA®. All applications were formulated in water with the addition of 2% w / v ammonium sulfate (AMS). The plants were evaluated at 7 and 14 days after treatment. Plants received a lesion classification with respect to visual stunting, chlorosis and general necrosis. The Ti generation is segregating, so some variable response is expected due to the difference in zigosity.
The spray results demonstrate at 7 DAT (days after treatment) minimal vegetative damage for high glyphosate rates that have been detected (data not shown).
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Table 27. Data on visual injury on 14 DAT demonstrate less than
15% average yisual lesion up to 2240 q ae / ha dej] ifosato
TraP8 :: dgt-28 Event 1Application Fee % Lesion % Lesion <20% 20-40% > 40% Average DetourPan-dron Banner(%) 0 g ae / ha glyphosate 4 0 0 0.0 0.0 0 560 g ae / ha 4 0 0 0.0 0.0 0 1120 g ae / ha 4 0 0 0.0 0.0 0 2240 g ae / ha 4 0 0 0.0 0.0 0 TraP8 :: dgt-28 Event 2 % Lesion % Lesion Application Fee <20% 20-40% > 40% Average DetourPattern Banner(%) 0 g ae / ha glyphosate 4 0 0 0.0 0.0 0 560 g ae / ha 4 0 0 3.8 4.8 0-10 1120 g ae / ha 4 0 0 12.0 3.6 8-15 2240 g ae / ha 4 0 0 15.0 6.0 8-20 Untransformed control % Lesion % Lesion Application Fee <20% 20-40% > 40% Average DetourPattern Banner(%) 0 g ae / ha glyphosate 4 0 0 0.0 0.0 0 560 g ae / ha 0 0 4 81.3 2.5 80-85 1120 g ae / ha 0 0 4 95.0 5.8 90-100 2240 g ae / ha 0 0 4 96.3 4.8 90-100
Detection of DGT-28 protein was evaluated for replicates of all four tested Ti strains of pDAB110827. The data demonstrated average DGT-28 protein ranges from 20-82 ng / cm ² and 21-209 ng / cm ² for hemizygote and homozygous replicates, respectively. These results demonstrated stable protein expression for Ti generation and rice tolerance dgt-28 up to 2240 g ae / ha of glyphosate following an application of 560 g ae / ha of glyphosate used for selection.
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Tobacco transformation with dgt-28. Pieces of tobacco leaf (cv. Petit havana) were transformed using Agrobacterium tumefaciens containing the dgt-28 transgene. Simple colonies containing the plasmid containing the dgt-28 transgene were inoculated into 4 ml of YEP medium containing spectinomycin (50 pg / ml) and streptomycin (125 pg / ml) and incubated overnight at 28 ° C on a shaker at 190 rpm. The 4 ml seed culture was subsequently used to inoculate a 25 ml culture of the same medium in a 125 ml Erlenmeyer flask. This culture was incubated at 28 ° C, shaking at 190 rpm until reaching an OD ₆ of 1.2. Ten ml of Agrobacterium suspension was then placed in sterile 60 x 20 mm petri dishes.
Freshly cut pieces (0.5 cm ² ) from aseptically grown plants in MS medium (Phytotechnology Labs, Shawnee Mission, KS) with 30 g / L sucrose in PhytaTrays® (Sigma, St. Louis, MO) were soaked in 10 mL of Agrobacterium overnight culture for a few minutes, blotted dry on sterile filter paper and then placed in the same medium with the addition of 1 mg / L of indolacetic acid and 1 mg / L of 6benzylamino purine. Three days later, leaf pieces co-cultivated with Agrobacterium carrying the dgt-28 transgene were transferred to the same medium with 5 mg / L of Basta® and 250 mg / L of cefotaxime.
After 3 weeks, individual To seedlings were transferred to MS medium with 10 mg / L of Basta® and 250 mg / L of cefotaxime for an additional 3 weeks before transplanting to soil and transfer to the greenhouse. Selected To plants (as identified using molecular analysis protocols described above) were allowed to self-pollinate and seed was collected from capsules when they were completely dry. Ti seedlings were evaluated for zygosity and reporter gene expression (as described below) and selected plants containing the dgt-28 transgene were identified.
The plants were taken to the greenhouse by washing with root agar, transplanting to the soil in square 13.75 cm pots, placing the pot in a Ziploc® bag (SC Johnson% Son, Inc.), placing
139/161 tap water at the bottom of the bag and placing indirect light in an oven at 30 ° C for one week. After 3-7 days, the bag was opened; the plants were fertilized and allowed to grow in the open pouch until the plants were acclimated in the greenhouse, when the pouch was removed. The plants were grown under common heated greenhouse conditions (27 ° C day, 24 ° C night, 16 hours day, minimum + supplementary natural light = 1200 pE / m ² s ¹ ).
Prior to propagation, T _o plants were sampled for DNA analysis to determine the copy number of dgt-28 inserted through real-time PCR. Fresh tissue was placed in tubes and lyophilized at 4 ^o C for days. After the fabric had dried completely, a tungsten bead (Valenite) was placed in the tube and the samples were subjected to 1 minute dry grinding using a Kelco bead grinder. The standard DNeasy® DNA isolation procedure was then followed (Qiagen, Dneasy 69109). An aliquot of the extracted DNA was then stained with Pico Green (Molecular Probes P7589) and read on the fluorometer (BioTek®) with known standards to obtain the concentration in ng / μΙ. A total of 100 ng of total DNA was used as a template. The PCR reaction was performed in the 9700 Geneamp® thermocycler (Applied Biosystems), by submitting samples at 94 ° C for minutes and 35 cycles of 94 ° C for 30 seconds, 64 ° C for 30 seconds and 72 ° C for 1 minute and 45 seconds followed by 72 ° C for 10 minutes. PCR products were analyzed by electrophoresis on a 1% agarose gel stained with EtBr and confirmed using Southern blots.
Five to nine positive PCR events with 1-3 copies of the dgt-28 gene from 3 constructs containing a different chloroplast transit peptide sequence (TraP4, TraP8 and TraP23) were generated and taken to the greenhouse.
All PCR-positive plants were sampled for quantification of DGT-28 protein by standard ELISA. DGT28 protein was detected in all PCR positive plants and a slope for an increase in protein concentration was noted with a high copy number of dgt-28.
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Ability to inherit aad-12 (V1) in tobacco. A progeny test of 100 plants was conducted on five Ti strains of dgt-28 per construct. The constructs contained one of the following chloroplast transit peptide sequences: TraP4, Trap8 or TraP23. The seeds were stratified, sown and transplanted with a relationship very similar to that of the Arabidopsis procedure exemplified above, with the exception that null plants were not removed by an initial selection before transplantation. All plants were then sprayed with 280 g ae / ha of IGNITE 280 SL for selection of the selectable marker pat as previously described. After 3 DAT, resistant and sensitive plants were counted.
Four of the five strains tested for each construct segregated as a dominant Mendelian trait, with single locus (3R: 1S), as determined through Chi square analysis. Dgt-28 is a gene for glyphosate resistance inheritable in multiple species.
Post-emergence herbicide tolerance in Ti tobacco transformed with dgt-28. Resistant plants Τ _Ί of each event used in the progeny test received unique identifiers and sampled for zigosity analyzes of the dgt-28 gene. Zygosity data were used to designate 2 hemizigote replicas and 2 homozygous replicates at each applied glyphosate rate allowing a total of 4 replicates per treatment. These plants were compared against wild type Petite havana tobacco. All plants were sprayed with a range sprayer adjusted to 187 L / ha. The plants were sprayed from a range of 560-4480 g ae / ha of DURANGO DMA®. All applications were formulated in water with the addition of ammonium sulfate 2 w / v (AMS). The plants were evaluated at 7 and 14 days after treatment. The plants received a lesion classification regarding general visual stunting, chlorosis and necrosis. The T-ι generation is segregating, so some variable response is expected due to the difference in zigosity.
Spray results demonstrated at 7 DAT (days after treatment) minimal vegetative damage for high glyphosa141 / 161 to which rates were detected (data not shown). Following 14 DAT, visual injury data demonstrate increased injury with single copy events of the construct containing TraP4 compared to single copy events of the constructs TraP8 and TraP23. Table 28.
Table 28. At a rate of 2240 q ae / ha, an average injury of 37.5% was demonstrated with the event containing TraP4, where events containing TraP8 and TraP23 showed an average injury of 9.3% and 9.5%, respectively.
TraP4 :: dgt-28 (pDAB107543) % Lesion % Lesion Application Fee <20% 20-40% > 40% Average DetourPattern Banner(%) 0 g ae / ha glyphosate 4 0 0 0.0 0.0 0 560 g ae / ha 2 2 0 18.0 8.1 10-25 1120 g ae / ha 1 3 0 24.5 4.9 18-30 2240 g ae / ha 0 3 1 37.5 6.5 30-45 4480 g ae / ha 0 2 2 42.5 2.9 40-45 TraP8 :: dgt-28(pDAB107545) % Lesion % Lesion Application Fee <20% 20-40% > 40% Average DetourPattern Banner(%) 0 g ae / ha glyphosate 4 0 0 0.0 0.0 0 560 g ae / ha 4 0 0 3.3 3.9 0-8 1120 g ae / ha 4 0 0 6.5 1.7 5-8 2240 g ae / ha 4 0 0 9.3 3.0 5-12 4480 g ae / ha 2 2 0 17.5 6.5 10-25 TraP23:: dgt-28 (pDAB107553) % Lesion% LesionApplication Fee <20% 20-40% > 40% Average DetourPattern Banner(%) 0 g ae / ha glyphosate 4 0 0 0.0 0.0 0 560 g ae / ha 4 0 0 10.0 1.6 8-12 1120 g ae / ha 4 0 0 8.8 3.0 5-12 2240 g ae / ha 4 0 0 9.5 4.2 5-15 4480 g ae / ha 4 0 0 15.8 1.5 15-18 Petite havana % Lesion % Lesion
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Application Fee <20% 20-40% > 40% Average |II DetourPattern Banner(%) 0 g ae / ha glyphosate 4 0 0 0.0 μ 0.0 0 560 g ae / ha 0 0 4 85.0; 4.1 80-90 1120 g ae / ha 0 0 4 91.3! 2.5 90-95 2240 g ae / ha 0 0 4 94.5 3.3 90-98 4480 g ae / ha 0 0 4 98.3 II 2.4 95-100
These results demonstrated tolerance of dgt-28 to 4480 g ae / ha of glyphosate, as well as differences in tolerance provided by chloroplast transit peptide sequences linked to the dgt-28 gene.
Protection of Dgt-28 against high glyphosate rates in the T2 generation. A progeny test of 25 plants was conducted on two to three T ₂ lines of dgt-28 per construct. Homozygous strains were chosen based on zygosity analyzes completed in the previous generation. The seeds were stratified, sown and transplanted as previously described. All plants were then sprayed with 280 g ae / ha of Ignite 280 SL for selection of selectable marker pat as previously described. After 3 DAT, resistant and sensitive plants were counted. All strains tested for each construct did not segregate, thus confirming homogeneous strains in the T ₂ generation and demonstrating Mendelian inheritance in at least two generations of dgt-28 in tobacco.
Rates of DURANGO DMA® ranging from 420-3360 g ae / ha of glyphosate were applied to 2-3 leaf tobacco as previously described. Visual injury data 14 DAT confirmed the tolerance results that were shown in the T1 generation. Leaf results from lineages of two copies of the construct containing TraP4 demonstrated similar tolerance to that of single copy TraP8 and TraP23 lineages (data not shown).
Table 29. Strains of single copy of the construct containing TraP4 with dgt28 showed increased lesion compared to strains of constructs with TraP8 and Tra P 23 with dgt-28
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TraP4 :: dgt-28 (pDAB107543) % Lesion % Lesion Application Fee <20% 20-40% > 40% Average DetourPattern Range (%) 0 g ae / ha glyphosate 4 0 0 0.0 0.0 0 420 g ae / ha 0 4 0 23.8 4.8 20-30 840 g ae / ha 0 4 0 30.0 4.1 25-35 1680 g ae / ha 0 4 0 35.0 5.8 30-40 3360 g ae / ha 0 4 0 31.3 2.5 30-35 TraP8 :: dgt-28(pDAB107545) % Lesion % Lesion Application Fee <20% 20-40% > 40% Average DetourPattern Range (%) 0 g ae / ha glyphosate 4 0 0 0.0 0.0 0 420 g ae / ha 4 0 0 0.0 0.0 0 840 g ae / ha 4 0 0 2.5 2.9 0-5 1680 g ae / ha 4 0 0 9.3 3.4 5-12 3360 g ae / ha 4 0 0 10.5 1.0 10-12 TraP23 :: dgt-28 (pDAB107553) % Lesion % Lesion Application Fee <20% 20-40% > 40% Average DetourPattern Banner(%) 0 g ae / ha glyphosate 4 0 0 0.0 0.0 0 420 g ae / ha 4 0 0 0.0 0.0 0 840 g ae / ha 4 0 0 6.3 2.5 5-10 1680 g ae / ha 4 0 0 10.0 0.0 10 3360 g ae / ha 3 1 0 13.8 4.8 10-20 Petite ha va na % Lesion % Lesion Application Fee <20% 20-40% > 40% Average DetourPattern Banner(%) 0 g ae / ha glyphosate 4 0 0 0.0 0.0 0 420 g ae / ha 0 0 4 95.0 0.0 95 840 g ae / ha 0 0 4 98.8 1.0 98-100 1680 g ae / ha 0 0 4 99.5 1.0 98-100 3360 g ae / ha 0 0 4 100 0.0 100
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The data demonstrated robust tobacco tolerance with dgt28 up to 3360 g ae / ha of glyphosate in two generations compared with the untransformed control.
Plants selected from each event were sampled before glyphosate applications for analysis of the DGT-28 protein using the standard DGT-28 ELISA. Data demonstrated expression of average DGT-28 protein from the single strains (1-2 copies) in the constructs ranging from 72.8114.5 ng / cm ² . Data demonstrate that dgt-28 is an expression protein in the T ₂ generation of transformed tobacco and tolerance data confirm functional DGT-28 protein.
Stacking of dgt-28 to increase the spectrum of herbicide in tobacco (cv. Petit havana). Plants dgt-28 (pDAB107543 and pDAB107545) and aad-12 v1 (pDAB3278) homozygous (see PCT / US2006 / 042133 for the latter, which is incorporated here for reference in its entirety) were both cross-crossed and Ft seed was collected . The F-ι seed from two reciprocal crosses of each gene was stratified and 6 reps from each crossing were treated with 1120 g ae / ha of glyphosate (selective for the dgt-28 gene), 1120 g ae / ha 2,4-D ( selective for aad-12 gene) or a tank mixture of the two herbicides at the rates described. The plants were graduated in 14 DAT. The spray results are shown in Table 30.
Table 30. Response from aad-12 and dgt-28 Fi
aad-12 x TraP4: .dgt-28 aad-12 x TraP8: .dgt-28 Petite havana Application Fee Tolerance 1120 g ae / ha 2,4-D ++++ ++++ - 1120 g ae / ha glyphosate ++ ++ - 1120 g ae / ha 2,4-D + 1120 g ae / ha glyphosate ++ ++ -
The results confirm that dgt-28 can be successfully stacked with aad-12 (v1), thus increasing the spectrum herbicides that can be applied to the crop of interest (glyphosate + phenoxyacetic acid for dgt-28 and add-12, respectively) . In crop production where it is difficult to control broadleaf weeds or resis weed biotypes
145/161 tents exist, the stack can be used as a means of weed control and protection of the crop of interest. Additional input or output characteristics could also be stacked with the dgt-28 gene.
Resistance to Glyphosate in Wheat. Production of binary vectors encoding DGT-28. Binary vectors containing DGT-28 expression and PAT selection cassettes were designed and assembled using skills and techniques commonly known in the field. Each DGT-28 expression cassette contained the promoter, 5 'untranslated region and intron of the Ubiquitin (Ubí) gene from Zea mays (Toki et al., Plant Physiol. 1992, 100 1503-07), followed by a sequence of coding consisting of one of four transit peptides (TraP4, TraP8, TraP23 or TraP5) fused to the 5 'end of a synthetic version of the 5-enolpyruvatochiquime 3-phosphate synthase (DGT-28) gene, which had been optimized in the codon for expression on plants. The DGT-28 expression cassette ended with a 3 'untranslated region (RTU) comprising the transcriptional terminator and polyadenylation site of a lipase gene (Vp1) from Z. mays (Paek et al., Mol. Cells 1998 30 ; 8 (3) 336-42). The PAT selection cassette comprised of the promoter, 5 'untranslated region and intron of the Actin (Act1) gene from Oryza sativa (McElroy et al., The Plant Cell 1990 2 (2) 163-171), followed by a synthetic version of the phosphinothricin acetyl transferase (PAT) gene isolated from Streptomyces víridochromogenes, which had been optimized at the codon for expression in plants. The PAT gene encodes a protein that confers resistance to glutamine synthetase inhibitors comprising phosphinothricin, glufosinate and bialaphos (Wohlleben et al., Gene 1998, 70 (1), 25-37). The selection cassette was terminated with the 3 'RTU comprising the transcriptional terminator and polyadenylation sites of the cauliflower mosaic virus (CaMV) gene 35s (Chenault et al., Plant Physiology 1993 101 (4), 1395-1396).
The selection cassette was synthesized by a commercial gene synthesis vendor (GeneArt, Life Technologies) and cloned into a Gateway binary vector. The DGT-28 expression cassettes were subcloned into pDONR221. The resulting ENTRY clone was used in an LR reaction
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Clonase II (Invitron, Life Technologies) with the Gateway binary vector encoding the phosphinothricin acetyl transferase (PAT) expression cassette. Colonies of all assembled plasmids were initially evaluated by restriction digestion of purified DNA using restriction endonucleases obtained from New England BioLabas (NEB; Ipswich, MA) and Promega (Promega Corporation, Wl). Plasmid DNA preparations were performed using the QIAprep Spin Miniprep Kit (Qiagen, Hilden) or the Pure Yield Plasmid Maxiprep System (Promega Corporation, Wl), following the instructions of the suppliers. Plasmid DNA from selected clones was sequenced using the ABI Sanger Sequencing and Bid Dye Terminator v3.1 cycle sequencing protocol (Applied Biosystems, Life Technologies). Sequence data was assembled and analyzed using the SEQUENCHER® software (Gene Codes Corporation, Ann. Arbor, Ml).
The resulting four binary expression clones: pDAS000122 (TraP4-DGT28), pDAS000123 (TraP8-DGT28), pDAS000124 (TraP23-DGT28) and pDAS000125 (TraP5-DGT28) were each transformed into an Agrobacterium tumefaciens EHA105 strain.
Production of transgenic wheat events with dgt-28 expression construct. Transgenic wheat plants expressing one of the four DGT-28 expression constructs were generated by transforming Agrobacterium using the donor wheat strain Bobwhite MPB26RH, following a protocol similar to Wu et al., Transgenic Research 2008, 17: 425-436. T _o putative transgenic events were selected for tolerance to phosphinothricin (PTT), the phenotype conferred by the selectable marker PAT and transferred to the soil. T _o plants were grown under greenhouse conditions and seed was produced. Overall, about 45 independent T _o events were generated for each DGT-28 expression construct.
Glyphosate resistance in wheat events dgt-28 of wheat Tp. Events were _the T allowed to acclimate in the greenhouse and were grown up to 2-4 sheets of plain appearance, new ones have emerged Flower (ie plants that transicionaram tissue culture for growing conditions in stud
147/161 fa). The plants were grown at 25 ° C under 12 hours of supplementary light in the greenhouse until maturity. An initial assessment of glyphosate tolerance and Taqman analysis was completed on T ₁ plants grown under the same conditions as previously described. The data allowed the determination of inheritable Tt events to be further characterized. Six low copy Ti events (1-2 copies) and two multiple copy events were replanted under greenhouse conditions and grown to the 3-leaf stage. Ti plants were sprayed with a commercial formulation of glyphosate (Durango DMA®) from the 420-3360 g ae / ha stage, which are capable of significantly damaging untransformed wheat strains. The addition of 2% w / v ammonium sulfate was included in the application. A lethal dose is defined as the rate that causes> 75% damage to the Bob White MPB26RH untransformed control. Herbicide was applied.
In this example, applications of glyphosate were used for both the determination of segregation of the dgt-28 gene in the Ti generation as well as demonstration of tolerance to high levels of glyphosate. The response of the plants is presented in terms of a visual injury scale 21 days after treatment (DAT). The data is presented as a histogram of individuals showing less than 25% visual injury (4), 25% -50% visual injury (3), 50% -75% visual injury (2) and more than 75 % of injury (1). An arithmetic mean and standard deviation are presented for each construct used for processing wheat. The individual response rating range is also indicated in the last column for each rate and transformation. Unprocessed, wild-type wheat (c.v. Bob White MPB26RH), served as a glyphosate sensitive control. In the Ti generation, hemizygous and homozygous plants were available for testing for each event and were then included for each glyphosate rate tested. Hemizigote plants will contain half the dose of the gene as homozygous plants, so variability of response to glyphosate can be expected in the T® generation
The results of the dgt-28 Ti wheat plants demonstrated that tolerance to glyphosate was obtained at rates of up to 3360 g ae / ha with the chloroplast transit peptides TraP4, TraP5, TraP8 and TraP23. Table 31.
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The data are from a low copy Ti event, but are representative of the population for each construct.
Table 31. Response of wheat events 0 (7 / -271 ^ of low copy to qlifosate 21 days after treatment__________________________ __________________________ _______________
TraP4 :: dgt-28 % Lesion % Lesion Application Fee <25% 25-50% 50-75% > 75% Average DetourPattern Range (%) 420 g ae / ha 5 0 0 0 4.00 0.00 4 840 g ae / ha 6 2 0 0 3.75 0.46 3-4 1680 g ae / ha 4 2 0 0 3.67 0.52 3-4 3360 g ae / ha 4 2 0 0 3.67 0.52 3-4 TraP8 :: dgt-28 % Lesion% Lesion Application Fee <25% 25-50% 50-75% > 75% Average DetourPattern Range (%) 420 g ae / ha 5 3 0 0 3.63 0.52 3-4 840 g ae / ha 3 5 0 0 3.38 0.52 3-4 1680 g ae / ha 4 3 0 0 3.57 0.53 3-4 3360 g ae / ha 5 5 0 0 3.50 0.53 3-4 TraP23:: dgt-28 % Lesion% Lesion Application Fee <25% 25-50% 50-75% > 75% Average DetourPattern Banner(%) 420 g ae / ha 9 2 0 0 3.82 0.40 3-4 840 g ae / ha 8 1 0 0 3.89 0.33 3-4 1680 g ae / ha 7 5 0 0 3.58 0.0 3-4 3360 g ae / ha 8 2 0 0 3.80 4.8 3-4 TRAPõ:: dgt-28 % Lesion% Lesion Application Fee <25% 25-50% 50-75% > 75% Average DetourPattern Banner(%) 420 g ae / ha 5 2 0 0 3.71 0.49 3-4 840 g ae / ha 4 2 0 0 3.67 0.52 3-4 1680 g ae / ha 7 3 0 0 3.70 0.48 3-4 3360 g ae / ha 6 0 0 0 4.00 0.00 3-4 BobwhiteMPB26RH % Lesion% Lesion Application Fee <25% 25-50% 50-75% > 75% Average DetourPattern Banner(%)
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420 g ae / ha 0 1 1 10 1.25 0.62 1-3 840 g ae / ha 0 0 0 10 1.00 0.00 1 1680 g ae / ha 0 0 0 12 1.17 0.58 1-3 3360 g ae / ha 0 0 0 10 1.00 0.00 1
On 21 DAT, resistant and sensitive plants are cut to determine the percentage of strains that segregated as a dominant Mendelian trait, single locus (3R: 1S), as determined through Chi square analysis. Table 32. These data show that dgt-28 is inherited as a robust glyphosate resistance gene in a monocot species.
Table 32. Percentage of dgt-28 T events per construct that demonstrated inheritance in a Mendelian manner based on a selection of glyphosate ^ at rates ranging from 420-3360 g ae / ha ________
Construct ID CTP: GOI % Tested T events that segregated in a single locus % T1 events tested that segregated in 2 loci No. T events tested pDAS000122 TraP4 :: w / gt-28 62.5% 37.5% 8 pDAS000123 TraP8 :: dgt-28 87.5% 12.5% 8 pDAS000124 TraP23 :: dgt-28 12.5% 87.5% 8 pDAS000125 TraP5 :: dgt-28 62.5% 0.0% 8
Example 4: Chimeric Chloroplast Transit Peptide (TraP) Sequences for Expression of Achonomically Important Transgenes in Cry2Aa 'Maize.
The Cry2Aa protein from Bacillus thuringiensis demonstrated activity against Helicoverpa zea (CEW) and Ostrinia nubilalis (ECB). A single version of the cry2Aa gene (SEQ ID NO: 10), codon induced for corn, was tested on corn. In this experiment, Cry2Aa was evaluated alone and in conjunction with the chimeric chloroplast transit peptide TraP8 to determine the
150/161 insect tolerance activity and evaluate the effect that the chimeric chloroplast transit peptide sequence TraP8 v2 would have on the expression of the Cry2Aa protein in corn.
The construct pDAB109807 containing the chimeric chloroplast transit peptide sequence TraP8 v2 (SEQ ID NO: 8) and a codon ligand GCA were cloned upstream of the cry2Aa gene and incorporated into the construct pDAB109807 (Figure 12) for tolerance testing to insect on corn plants. The resulting constructs contained two plant transcription units (PTU). The first PTU contained the Zea mays Ubiquitin 1 promoter (ZmUbil promoter; Christensen, A., Sharrock, R. and Quail, P. (1992) Maize polyubiquitin genes: structure, thermal perturbation of expression and transcripts splicing, and promoter activity following transfer to protoplasts by electroporation, Plant Molecular Biology, 18: 675-689), TraP8-c / y2Aa fusion gene (TraP8 Cry2Aa) and 3 'untranslated Lipase region of Zea mays (ZmLip 3' UTR; US Patent No. 7,179,902). The constructs were confirmed by restriction enzyme digestion and sequencing. The second PTU comprised the sugarcane bacilliform virus promoter (SCBV promoter; US Patent No. 6,489,462), aad-1 herbicide tolerance gene containing an MSV leader and alcohol dehydrogenase 1 intron 6 (AAD-1; US Patent No. 7,838,733; and MSV Leader Sequence; No. Genbank FJ882146.1 and the alcohol dehydrogenase intron; No. Genbank EF539368.1) and 3 'untranslated Lipase region of Zea mays (ZmLip 3'UTR). A control plasmid, pDAB107687, which did not contain a chloroplast transit peptide sequence upstream of the cry2Aa gene, was constructed and included in the studies (Figure 13). Plasmids were introduced into Agrobacteríum tumefaciens for plant transformation.
Ears of Zea mays cultivar B104 were collected 10-12 days post-pollination. The harvested ears were peeled and sterilized on the surface by immersion in a 20% commercial bleach solution (Ultra Clorox® Germicidal Bleach, 6.15% sodium hypochlorite) and two drops of Tween 20, for 20 minutes, followed by three rinses in sterile, deionized water, inside a laminar flow cap. Zygotic embryos
151/161 immatures (1.8-2.2 mm in length) were aseptically excised from each ear and distributed in one or more microcentrifuge tubes containing 2.0 ml of Agrobacterium suspension to which 2 pl of BreakThru® 10% surfactant S23 had been added.
Upon completion of the embryo isolation activity, the embryo tube was closed and placed on a shaking platform for 5 minutes. The contents of the tube were then poured into a culture medium plate and the liquid Agrobacterium suspension was removed with a sterile, disposable transfer pipette. The coculture plate containing embryos was placed on the back of the laminar flow cap with the lid ajar for 30 minutes; moment after which the embryos were oriented with the scutellum facing upwards using a microscope. The embryo co-culture plate was then returned to the back of the laminar flow cap with the cap ajar for another 15 minutes. The plate was then closed, sealed with 3M Micropore tape and placed in an incubator at 25 ° C with 24 hours / daylight at approximately 60 pl m ' ² s' ¹ light intensity.
Following the period of co-cultivation, the embryos were transferred to Medium of rest. No more than 36 embryos were taken to each plate. The plates were wrapped with 3M micropore tape and incubated at 27 ° C with 24 hours / daylight at approximately 50 pmol m ^-2 s' ¹ of light intensity for 7-10 days. Callus embryos were then transferred to Selection I medium. No more than 8 embryos with callus were taken to each Selection I plate. The plates were wrapped with 3M micropore tape and incubated at 27 ° C with 24 hours / daylight in approximately 50 pmol m ² s' ¹ of light intensity for 7 days. The callus embryos were then transferred to Selection II medium. No more than 12 embryos with callus were taken to each Selection II plate. The plates were wrapped with 3M micropore tape and incubated at 27 ° C with 24 hours / daylight at approximately 50 pmol m ' ² s' ¹ of light intensity for 14 days.
At this stage resistant calluses were taken to the PreRegeneration medium. No more than 9 calluses were taken for each plate of
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Pre-Regeneration. The plates were wrapped with 3M micropore tape and incubated at 27 ° C with 24 hours / daylight at approximately 50 pmol m ' ² s' ¹ of light intensity for 7 days. Regeneration calluses were then transferred to Regeneration medium in Phytatrays® and incubated at 28 ° C with 16 hours of light / 8 hours of darkness per day at approximately 150 pmol m ' ² s' ¹ of light intensity for 7-14 days or until the buds develop. No more than 5 calluses were applied to each Phytatray®. Small shoots with primary roots were then isolated and transferred to Broto / Root medium. Rooted seedlings of about 6 cm or higher were transplanted into the soil and taken to a growth chamber for hardening.
Transgenic plants were given unique identifiers and transferred on a regular basis to the greenhouse. The plants were transplanted from Phytatrays® into small pots (TO Plastics, SVD (3.5 inches), 700022C) filled with growth medium (Premier Tech Horticulture, ProMix BX, 0581 P) and covered with humidomes to help acclimate the plants . The plants were placed in a Conviron® growth chamber (28 ° C / 24 ° C, 16-hour photoperiod, RH 50-70%, 200 pmol light intensity) until they reached stage V3-V4. This helped in acclimatizing the plants to the soil and hostile temperatures. The plants were then taken to the greenhouse (Type of Light Exposure: Photo or Assimilation; High Light Limit: 1200 PAR; duration of the day 16 hours; 27 ° C Day / 24 ° C Night) and transplanted from small pots to pots 13.97 cm (5.5 inches). Approximately 1-2 weeks after transplanting into larger pots, the plants were sampled for bioassay. One plant per event was bioassayed.
Selection events were identified regarding advancement to the next generation based on gene copy number, protein detection through Western blot and activity against bioassay insects. Events that contained the Spectinomycin resistance gene were noted, but not necessarily omitted from advancement. Events selected for advancement were transplanted into 18.93 L (5 gallon) pots. Observations were periodically made to monitor any phenotypes
153/161 abnormal wells. Bud bags were placed on the buds before the emergence of silk to prevent cross contamination by tray pollen. Any shoots producing silks before covering were noticed and the bud was removed. The second bud was then covered and used for pollination. Plants that produced abnormal shoots or any shoots were recorded in a database. The silks were cut the day before pollination to provide for uniforms to accept pollen and the plants were self-pollinated.
Plants for Ti selection were sprayed 7 days after sowing. They were grown in 10.16 cm (4 inch) pots of cultivation soil in a Metro 360 pot with 15 pots per tray. The seedling growth stage was V1-V1.5. Pots with poor germination or that contain very small plants (flower still closed) were marked so that they were not included in the selection evaluation. Whole trays of plants were then placed in secondary carrier trays for spray application by strip. The trays were placed two at a time in the pulverizer by strip Mandi, calibrated to apply a volume of 187 L / ha to the target area using a flat fan nozzle 8002E (Tee Jet). A solution of 35 g ae / ha Assure II (quizalofope) + COC 1% (culture oil concentrate) was formulated for the application. A volume of 15 ml / spray was used to calculate the required total spray solution: Calculations: (35 g ae / ha) x (1 ha / 187L) x (1 L / 97.7 g ae Assure II) = 0.192 solution % or 28.74 pl / 15 ml of H ₂ O + 1% v / v). After application, the plants were then allowed to dry for an hour in a spray lab before returning to the greenhouse. Approximately 1-2 weeks after transplanting into larger pots, the plants were sampled for bioassay. One plant per event was bioassayed.
All of the T events which passed through molecular analysis screen were analyzed for levels of Cry2Aa protein expression. The events of the control construct, pDAB107687, which comprised Cry2Aa without a TraP had a higher mean expression level of Cry2Aa (15.0 ng / cm ² ) compared to events of pDAB109807 (5.0 ng / cm2) that contained
154/161 had TraP8. Despite the reduced expression levels of the pDAB109807 events, these events still expressed the Cry2Aa protein.
ΊΠ events were also analyzed for Cry2Aa protein expression levels. The events of the control construct, pDAB107687, which comprised Cry2Aa without a TraP, had a significantly higher mean expression level of Cry2Aa (55 and 60 ng / cm ² ) compared to events of pDAB109807 (about 20 to 40 ng / cm ² ) that contained TraP8. Despite the reduced expression levels of the pDAB109807 events, these events still expressed the Cry2Aa protein.
Transgenic plants containing the unique Bt genes were tested for insecticidal activity in bioassays conducted with neonatal lepidopteran larvae on leaves of transgenic plants. The tested lepidopteran species were European Corn Broca, Ostrínia nubilalis (Hübner) (ECB) and the Corn Moth, Helicoverpa zea (CEW).
32-well trays (C-D International, Pitman, NJ) were partially filled with a 2% agar solution and the agar was allowed to solidify. Approximately 2.54 cm (1 inch) leaf sections were obtained from each plant and placed alone in wells of the 32-well trays. A piece of leaf was placed in each well, and two pieces of leaf were tested per plant and per insect. The insects were infested in the mass using a brush, placing 10 neonatal larvae in each cavity. The trays were sealed with perforated adhesive covers that allowed ventilation during the test. The trays were placed at 28 ° C, 40% RH, 16 hours light: 8 hours dark for three days. After the test, a simple percentage damage score was obtained for each piece of leaf. Damage scores for each test were averaged and used alongside protein expression analysis to conduct correlation analyzes.
The results of the T _o and Ti bioassay indicated that the chimeric chloroplast transit peptide sequence TraP8 was functional and that the events of pDAB109807 provided protection against the insects tested. In T _1t events, plants expressing the Cry2Aa protein without a TraP (pDAB107687) had medium leaf damage that was not significant.
155/161 differently from that of the plant expressing the protein Cry2Aa with TraP8 (pDAB109807) in all tested insect species. These results were surprising, given that plants expressing the Cry2Aa protein without a TraP (pDAB 107687) expressed higher levels of protein compared to plants expressing the Cry2Aa protein with TraP8 (pDAB109807).
Vip3ab1:
Bacillus thuringiensis protein Vip3ab1 demonstrated activity against Helicoverpa zea (CEW) and Autumn Cartridge Caterpillar (FAWE) and resistant cartridge caterpillar (rFAW). The vip3ab1 v6 (SEQ ID ΝΟ.Ί1) and vip3ab1 v7 (SEQ ID ΝΟ.Ί2) genes were expressed and tested for insect tolerance in corn. In this experiment, vip3ab1 v6 and vip3ab1 v7 were evaluated alone and in conjunction with the chimeric chloroplast transit peptide TraP8 in maize to determine insect tolerance activity and evaluate the effect that the chimeric chloroplast transit peptide sequence TraP8 v2 would have on the expression of Vip3ab1 v6 and Vip3ab1 v7 proteins in corn.
The construct pDAB111481 (Figure 14) containing the sequence (SEQ ID NO: 8) of the chimeric chloroplast transit peptide encoding polynucleotide TraP8 v2 and codon ligand GCA were cloned upstream of the vip3ab1 v6 gene and tested for tolerance to insect on corn plants. The resulting construct contained two plant transcription units (PTU). The first PTU comprised the Zea mays Ubiquitin 1 promoter (ZmUbil promoter; Christensen, A., Sharrock, R. and Quail, P. (1992) Maize polyubiquitin genes: estructure, thermal perturbation of expression and transcript splicing, and promoter activity following transfer to protoplasts by electroporation, Plant Molecular Biology, 18: 675-689), TraP8-vip3ab1 v6 fusion gene (TraP8-Vip3ab1 v6) and 3 'untranslated Zea peroxidase region (ZmPer 5 3'UTR). The construct was confirmed through digestion and restriction enzyme sequencing. The second PTU comprised the sugarcane bacilliform virus promoter (SCBV promoter; U.S. Patent No. 6,489,462), aad-1 herbicide tolerance gene
156/161 containing an MSV leader and alcohol dihydrogenase intron 6 (AAD-1; US Patent No. 7,838,733 and MSV leader sequence; Genbank No. Gen. FJ882146.1 and the alcohol dehydrogenase intron; Genbank No. EF539368.1) and 3 'untranslated Lipase region of Zea mays (ZmLip 3'UTR). A control plasmid, pDAB111479, which did not contain a chloroplast transit peptide sequence upstream of the vip3ab1 v6 gene, was constructed and included in the studies (Figure 15). The plasmids were introduced into Agrobacterium tumefaciens for plant transformation.
The construct pDAB111338 (Figure 16) which contains the chimeric chloroplast transit peptide sequence Trap8 v2 (SEQ ID NO: 8) and a codon ligand GCA were cloned upstream of the vip3ab1 v7 gene and tested for insect tolerance by testing in corn plants. The resulting construct contained two plant transcription units (PTU). The First PTU was comprised of a Zea mays Ubiquitin 1 promoter (ZmUbil promoter; Christensen, A., Sharrock, R. and Quail, P. (1992) Maize polyubiquitin genes: structure, thermal perturbation of expression and transcript splicing, and promoter activity following transfer to protoplasts by electroporation, Plant Molecular Biology, 18: 675-689), TraP8 fusion gene Vip3ab1v7 (Jrap8-vip3ab1 v7) and 3 'untranslated region of Zea mays Peroxidase (ZmPer 5 3'UTR). The construct was confirmed through digestion and restriction enzyme sequencing. The second PTU was comprised of a sugarcane bacilliform virus promoter (SCBV promoter; US Patent No. 6,489,462), aad-1 herbicide tolerance gene containing an MSV leader and alcohol dehydrogenase 1 (AAD intron 6) -1; US Patent No. 7,838,733, MSV leader sequence; No. Genbank FJ882146.1 and the alcohol dehydrogenase intron; No. Genbank EF539368.1) and 3 'untranslated Lipase region of Zea mays (ZmLip 3'UTR). A control plasmid, pDAB 112710, which did not contain a chloroplast transit peptide sequence upstream of the Vip3ab1v7 gene was constructed and included in the studies (Figure 17). The plasmids were cloned into Agrobacterium tumefaciens for plant transformation.
Corn transformation, protein expression and bioassays of
157/161 insects were completed following the protocols previously described, and the results are shown in Table 33. The results from insect bioassays indicated that the chimeric chloroplast transit peptide sequence Trap8 was functional and that events pDAB111338 and pDAB111481 provided protection against insects tested in bioassay. In the events tested, plants expressing the Vip3ab1 protein without a TraP, (pDAB112710 and pDAB111479), had medium leaf damage that was not significantly different from that of the plant expressing the Vip3ab1 protein with TraP8 (pDAB111338 and pDAB111481). In conclusion, the Western 10 blots and bioassays indicated that all of the events tested expressed the protein Vip3 Ab1.
158/161
MVJJ X— LO CD CO °! ΡθΙΛΙ% euioj ep oubq H-' xr LO ’ C íO O O O leioiMVJJ oubq LO CXI i <r- O- CJ x—MV3 xr LO Xt O ΟΙΡΦΙΛΙ% BL |] OJ θρ OUBQ CD co ’ LO x—O O O O | B | O1 MVd OUBQ 368 O r> o x— CD CD ΛΛ3Ο oo co O O °! ΡθΙΛΙ% bliioj θρ OUBQ O O-L-O O O O ΛΛ3Ο | B) O1 oubq 205 124 cd r- poo sopBjsai so} U0aq CD r ^ - the CM CD> -O COLO ujs; ss / vi soaiiisoj so ^ uca ^ C l co ( ^z lUO / | OLUj) < < < < SIAI / SI / I / O3 ( ^z wo / 6u) ω ω—I ω_1 U) VSI33 osi | BUB θρ οροίθΐΛΐ LLI LLI LLI LLI Bipeiu oBSsejdxg CD LO CD CO CO O oo CXI CL CM CL CMCO > co >I- 00 CL H 00 CL dog o ~ Z- C0H O ~ Z- CO Hcp cor- (/> Q _Q jQ _Q _Q< <r < <rCO CO CO coCL> CL> CL> CL>CDO 00 O r- 00 χ— co 0) r ^ - co O C l y AND v- x— ω 00 m m m CD < < < < CL Q Q Q QCL CL CL CL
159/161
Example 5: Clivaqem In Planta Chimeric Chloroplast Transit Peptide (TraP) Sequences
The dividing site of the chimeric chloroplast transit peptides TraP8 and Trap9 was determined using MALDI spectrometry and N-terminal Edman degradation sequencing. Plant material was obtained from transgenic plants that contained the fusion genes TraP8dgt14, TraP8-dgt28, TraP9-dgt14 and TraP9-dgt28 and tested to determine the chimeric chloroplast transit peptide dividing location that occurred during translocation within the chloroplast.
MALDI results:
Semipurified proteins from a plant sample were separated using SDS-PAGE. Protein strips of a size equivalent to the molecular weight of YFP were excised from the gel, sham removed and dried. Then, the dried protein strips were digested in gel with Trypsin (Promega; Madison, Wl) in 25 mM ammonium bicarbonate overnight at 37 ° C. The peptides were purified using a ZipTip® C18 (Millipore, Bedford, MA) and eluted with 50% acetonitrile / 0.1% TFA. The samples were mixed with a-cyano-4-hydroxycinnamic acid matrix in a 1: 1 ratio and the mixture was sported on a MALDI sample plate and air-dried.
The mass spectrum of the peptide was generated using a Voyager DE-PRO MALDI-TOF Mass Spectrometer® (Applied Biosystems; Framingham, MA). External calibration was performed using a Calibration Mixture 2® (Applied Biosystems). Internal calibration was performed using the trypsin autolysis peaks at m / z 842,508, 1045,564 and 2211,108. All mass spectra were collected in the positive ion reflector model. The peptide mass fingerprint (PMF) analysis (Peptide Massa Fingerprint) was conducted using Proteometrics LLC's free PAWS® (Protein Analysis WorkSheef) program comparing the sample's PMF with the target protein's theoretical PMF to verify that the sample was target protein. Protein identification was carried out through database research using MASCOT (MatrixScience, London, UK) against
160/161 NCBI NR protein data.
N-Terminal Sequencing Through Edman Chemical Degradation:
N-terminal sequencing was performed on a Procise Protein Sequencer (model 494) from Applied Biosystems (Foster City, CA). The protein samples were first separated by SDS-PAGE, then blotted on PVDF membrane. The protein strips were excised from the membrane and loaded into the Procise Sequencer. Eight Edman chemical degradation cycles were performed for each sample to give five AA residues at the N-terminus. A standard mixture of 20 PTH 10 amino acids (Applied Biosystems) was performed with each sample. The amino acid residues of each Edman degradation were determined based on their retention times of the C-18 column against the standards.
The results of the MALDI sequencing indicated that the DGT-28 and DGT-14 proteins were expressed and that the chimeric Chloroplast transit peptide 15 sequences were processed. Table 34 lists the processed strings that were obtained using Edman N-terminal degradation and MALDI sequencing.
161/161
Table 34. TraP8 and Trap9 dividing sites merged with the dgt-14 or dgt-28 coding sequences. The gray box indicates the linked site

权利要求:
Claims (11)
[1]
1. Isolated nucleic acid molecule, characterized by the fact that it comprises:
a nucleotide sequence derived from synthetic Brassica encoding a peptide comprising a contiguous amino acid sequence of a first Brassica chloroplast transit peptide, the peptide further comprising a contiguous amino acid sequence of a second chloroplast transit peptide, wherein, preferably, the isolated nucleic acid molecule fills at least one of the following:
i) said isolated nucleic acid molecule further comprises a nucleotide sequence of interest linked to the nucleotide sequence derived from synthetic Brassica, wherein, preferably, said isolated nucleic acid molecule satisfies at least one of the following:
The. said isolated nucleic acid molecule further comprises at least one additional nucleotide sequence (s), each encoding a chloroplast transit peptide, wherein the complementary nucleotide sequence (s) is (are) operably linked to the nucleotide sequence of interest , where preferably at least one additional nucleotide sequence (s) is from an organism selected from the group consisting of prokaryotes, photosynthetic lower eukaryotes, and chlorophytes,
B. the nucleotide sequence derived from synthetic Brassica and the nucleotide sequence of interest are functionally linked to one or more regulatory sequences,
ç. the nucleic acid molecule encodes a chimeric polypeptide comprising a peptide encoded by the nucleotide sequence of interest and a peptide encoded by the nucleotide sequence derived from synthetic Brassica.
ii) the first chloroplast transit peptide is Brassica napus or Brassica rapa, where, preferably, the second peptide
[2]
2/6 of the chloroplast transit is from Brassica sp. different from the first transit peptide from Brassica chloroplast, iii) the first transit peptide from Brassica chloroplast is from a 3-enolpyruvylchiquime-5-phosphate synthase gene, iv) the second chloroplast transit peptide is from a gene of 3-enolpyruvylchiquimate-5-phosphate synthetase,
v) the peptide is at least 80%, preferably at least 85%, more preferably at least 90%, even more preferably at least 95%, even more preferably at least 98% identical to a chloroplast transit peptide selected from the group consisting of SEQ ID NOs: 3 and 4, and the most preferred is the peptide selected from the group consisting of SEQ ID N'fe: 3 and 4, vi) the coding sequence of the nucleotides of interest does not encode the peptide of SEQ ID NO: 1 or SEQ ID NO: 2, vii) the nucleotide sequence encoding the peptide is specifically hybridizable to a nucleotide sequence selected from the group consisting of SEQ ID NOs: 5, 6, 8 and 9.
2. Chimeric polypeptide, characterized by the fact that it is encoded by the nucleic acid molecule as defined in claim 1, wherein preferably, the chimeric polypeptide fulfills at least one of the following:
i) the peptide encoded by the nucleotide sequence of interest is directed to a plastid in a cell containing plastid, where, preferably, the polypeptide comprises a chloroplast transit peptide that is removed when the peptide encoded by the nucleotide sequence of interest is facing the plastid, ii) the peptide encoded by the nucleotide sequence of interest is a biologically active peptide, in which, preferably, the chimeric polypeptide meets at least one of the following:
The. the biologically active peptide is an enzyme, preferably the biologically active peptide is selected from the group consisting of: acetolactase synthase (ALS), mutant ALS, ALS precursors, synthase
[3]
3/6 of 3-enolpyruvylchiquimate-5-phosphate (EPSPS), CP4 EPSPS, an EPSPS class III, and an EPSPS class IV,
B. the biologically active peptide is normally expressed in a plastid of a cell in which the peptide is expressed natively,
ç. the biologically active peptide is involved in a process selected from the group consisting of herbicide resistance, virus resistance, pathogen resistance, insect resistance, nematode resistance fungal resistance, plant vigor, plant yield, temperature tolerance, tolerance the condition of the soil, tolerance to low light level, low tolerance to water level, high tolerance to water level, tolerance to chemical environment, seed color, modification of starch, synthesis of amino acids, photosynthesis, synthesis of fatty acids, oil synthesis, carotenoid synthesis, terpenoid synthesis, starch synthesis, and herbicide resistance, preferably the biologically active peptide is involved in herbicide resistance,
d. the biologically active peptide is selected from the group consisting of zeaxanthin epoxidase, choline monooxygenase, ferroquelatase, fatty acid omega 3 desaturase, glutamine synthetase, provitamin A, hormones, Bt toxin proteins, and useful markers for plant identification comprising a characteristic of interest, iii) the peptide encoded by the nucleotide sequence of interest is a fluorescent peptide.
3. Plant expression vector, characterized by the fact that it comprises the nucleic acid molecule as defined in claim 1
i).
[4]
4. Method for the production of a transgenic plant material, characterized by the fact that it comprises:
obtaining the isolated nucleic acid molecule as defined in claim 1 i); and transforming a plant material with the nucleic acid molecule, wherein, preferably, the method includes at least one of the following:
4/6
i) the plant material is selected from the group consisting of a plant cell, a plant tissue, a plant tissue culture, a callus culture, a part of the plant, and an entire plant, ii) the plant material is not an entire plant.
[5]
5. Isolated nucleic acid molecule, characterized by the fact that it comprises a Brassica derivative medium for directing a polypeptide to a chloroplast, said isolated nucleic acid molecule further comprising, preferably, a nucleotide sequence of operationally linked interest to the Brassica derivative for targeting a polypeptide to a chloroplast, wherein more preferably the nucleic acid molecule encodes a chimeric polypeptide comprising a peptide encoded by the nucleotide sequence of interest.
[6]
6. Chimeric polypeptide, characterized in that it is encoded by the nucleic acid molecule as defined in claim 5 wherein, preferably, the chimeric polypeptide fulfills at least one of the following:
i) the peptide encoded by the nucleotide sequence of interest is directed to a plastid in a cell containing plastid, wherein, preferably, the polypeptide comprises a chloroplast transit peptide that is removed when the peptide encoded by the nucleotide sequence of interest is facing the plastid, ii) the peptide encoded by the nucleotide sequence of interest is a biologically active peptide, in which, preferably, the chimeric polypeptide fills at least one of the following:
The. the biologically active peptide is involved in a process selected from the group consisting of herbicide resistance, virus resistance, pathogen resistance, insect resistance, nematode resistance fungal resistance, plant vigor, plant yield, temperature tolerance, tolerance to soil condition, tolerance to low light level, low tolerance to water level, high tolerance to water level, tolerance to chemical environment, seed color, ami modification
5/6 do, amino acid synthesis, photosynthesis, fatty acid synthesis, oil synthesis, carotenoid synthesis, terpenoid synthesis, starch synthesis, and herbicide resistance,
B. the biologically active peptide is selected from the group consisting of zeaxanthin epoxidase, choline monooxygenase, ferroquelatase, fatty acid omega 3 desaturase, glutamine synthetase, provitamin A, hormones, Bt toxin proteins, and useful markers for plant identification comprising a feature of interest,
ç. the biologically active peptide is selected from the group consisting of: acetolactase synthase (ALS), mutant ALS, ALS precursors, 3-enolpyruvylchiquimate-5-phosphate synthase (EPSPS), CP4 EPSPS, an EPSPS class III, and a class III EPSPS IV.
[7]
7. Plant expression vector, characterized by the fact that it comprises the nucleic acid molecule as defined in claim 6.
[8]
8. Method for the production of a transgenic plant material, characterized by the fact that it comprises:
obtaining the isolated nucleic acid molecule as defined in claim 6; and transforming a plant material with the nucleic acid molecule, wherein the method preferably includes at least one of the following:
i) the plant material is selected from the group consisting of a plant cell, a plant tissue, a plant tissue culture, a callus culture, a part of the plant, and an entire plant, ii) the plant material is not an entire plant.
[9]
9. Use of a transgenic plant material comprising a nucleic acid molecule as defined in claim 1, characterized by the fact that it is for planting or cultivating a transgenic culture.
[10]
10. Method for generating transgenic plant material, characterized by the fact that it comprises crossing a plant comprising the nucleic acid molecule as defined in claim 1.
6/6
[11]
11. Invention, characterized by any of its embodiments or categories of claim encompassed by the material initially disclosed in the patent application or in its examples presented here.

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法律状态:
2019-03-06| B03A| Publication of a patent application or of a certificate of addition of invention [chapter 3.1 patent gazette]|

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2019-03-19| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|

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2019-08-20| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|

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2021-07-06| B07A| Application suspended after technical examination (opinion) [chapter 7.1 patent gazette]|

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2021-12-07| B07A| Application suspended after technical examination (opinion) [chapter 7.1 patent gazette]|

优先权:

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申请号 | 申请日 | 专利标题

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US201261593555P| true| 2012-02-01|2012-02-01|

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US61/593.555|2012-02-01|

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US201261625222P| true| 2012-04-17|2012-04-17|

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