WO2021137255A1 - Événement de transformation ee-6726 de l'aubergine (solanum melongena), kit et procédé de détection d'événement ee-6726 - Google Patents

Événement de transformation ee-6726 de l'aubergine (solanum melongena), kit et procédé de détection d'événement ee-6726 Download PDF

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WO2021137255A1
WO2021137255A1 PCT/IN2020/051075 IN2020051075W WO2021137255A1 WO 2021137255 A1 WO2021137255 A1 WO 2021137255A1 IN 2020051075 W IN2020051075 W IN 2020051075W WO 2021137255 A1 WO2021137255 A1 WO 2021137255A1
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seq
event
dna
brinjal
sequence
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PCT/IN2020/051075
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Narendran Madhavan Nair
Ratnapal Popatlal Gandhi
Bharat CHAR
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Sungro Seeds Pvt. Ltd.
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Publication of WO2021137255A1 publication Critical patent/WO2021137255A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
    • C12N15/00—Mutation or genetic engineering; DNA or RNA concerning genetic engineering, vectors, e.g. plasmids, or their isolation, preparation or purification; Use of hosts therefor
    • C12N15/09—Recombinant DNA-technology
    • C12N15/63—Introduction of foreign genetic material using vectors; Vectors; Use of hosts therefor; Regulation of expression
    • C12N15/79—Vectors or expression systems specially adapted for eukaryotic hosts
    • C12N15/82—Vectors or expression systems specially adapted for eukaryotic hosts for plant cells, e.g. plant artificial chromosomes (PACs)
    • C12N15/8241—Phenotypically and genetically modified plants via recombinant DNA technology
    • C12N15/8261—Phenotypically and genetically modified plants via recombinant DNA technology with agronomic (input) traits, e.g. crop yield
    • C12N15/8271—Phenotypically and genetically modified plants via recombinant DNA technology with agronomic (input) traits, e.g. crop yield for stress resistance, e.g. heavy metal resistance
    • C12N15/8279—Phenotypically and genetically modified plants via recombinant DNA technology with agronomic (input) traits, e.g. crop yield for stress resistance, e.g. heavy metal resistance for biotic stress resistance, pathogen resistance, disease resistance
    • C12N15/8286—Phenotypically and genetically modified plants via recombinant DNA technology with agronomic (input) traits, e.g. crop yield for stress resistance, e.g. heavy metal resistance for biotic stress resistance, pathogen resistance, disease resistance for insect resistance
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
    • Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
    • Y02A40/146—Genetically Modified [GMO] plants, e.g. transgenic plants

Definitions

  • This invention relates to a novel transformation event EE-6726 of brinjal plant, Solanum melongena that exhibits tolerance to fruit and shoot borer.
  • the invention also provides nucleic acid molecules that are unique to the event and methods related to the same. Kits and methods in conducting assays for detection of the event EE-6726 are also provided.
  • Brinjal or eggplant ⁇ Solanum melongena L. is an important solanaceous crop of sub tropics and tropics. It is a staple food in India and other countries in South and Southeast Asia where it is also known as brinjal, whereas the name eggplant has been derived from the shape of the fruit of some varieties, which are white and resemble in shape to chicken eggs. It comes in a variety of shapes and colors. It is one of the most common, popular and principal vegetable crops grown throughout the country except higher altitudes. The popularity of brinjal is due to its versatile nature and this crop can adopt to different agro climatic regions and also grown throughout the year. It is a perennial but grown commercially as an annual crop.
  • the affected fruits lose their market value over and above the considerable reduction in yield. In India, it has been estimated that fruit and shoot borer causes damage to fruits ranging from 25.8 - 92.5 % and yield reduction from 20.7 - 60%.
  • farmers routinely spray broad-spectrum insecticides, often two to three times per week, and, in some cases, twice a day. Consequently, over 100 sprays per season may be applied, resulting in high residues on the fruit.
  • farmers lose anywhere from 30 to 60% of the crop yield to EFSB despite the high use of insecticides.
  • the cost of insecticide treatments accounts for 35 to 40% of the total cost of cultivation of brinjal.
  • Such an insecticide-dependent strategy poses both environmental and health concerns.
  • farmers use large quantities of chemical insecticides singly or in combination to get blemish free fruits, which fetch premium prices in the market.
  • Transgenic plants with Bacillus thuringensis (Bt) gene developed to date produce one Cry toxins constitutively, conferring continuous pest insect resistance without affecting non target insects.
  • Bacillus thuringensis (Bt) gene developed to date produce one Cry toxins constitutively, conferring continuous pest insect resistance without affecting non target insects.
  • One of the main issues related to use of this technology is the potential for development of resistance by target insect pests due to intense selection pressure. Although altered toxin binding is the best-characterized mechanism of resistance, alteration of any step in the toxin mode of action can result in decreased susceptibility.
  • cry2Abgene Bacillus thuringiensis (Bt), which is a gram positive bacterium synthesizing insecticidal crystalline (Cry) inclusions during sporulation.
  • the cry2Abgene encodes the Cry2Ab protein (d- endotoxins) and is highly specific to Lepidopteran larvae.
  • Cry2Ab protein must be ingested by the insect to exhibit insecticidal activity.
  • the protein in its crystalline form is insoluble in aqueous solution at neutral or acidic pH however the pH of the larval insect gut is alkaline which favors solubilization of the protein crystal.
  • the solubilized protein is subsequently activated by the proteases in the insect gut.
  • the activated protein diffuses through the peritrophic membrane of the insect to the midgut epithelium. Here it binds to specific high affinity receptors on the surface of the midgut epithelium of target insects. Pores are formed in the membrane leading to leakage of intracellular content (eg. K+) into the gut lumen and water into the epithelial gut cells. The larval gut epithelial cells swell due to osmotic pressure and lyse. The gut becomes paralyzed as a consequence of changes in electrolytes and pH in the gut resulting into starvation and death of larvae.
  • intracellular content eg. K+
  • the expression of a foreign gene in plants is known to be influenced by the location of the transgene in the genome of the plant. Variations in transgene expression occur due to insertion into chromatin regions which may be more transcriptionally active (euchromatin) or less active (heterochromatin). Examples of these are methylated regions in which gene expression is suppressed, or in the proximity of transcriptional regulation elements like enhancers and suppressor, which increase or decrease gene expression respectively. Therefore, it is necessary to screen a, large number of independent transformation event for the expression of the transgene and to identify the event showing desired expression of the heterologous inserted gene.
  • Such selection often requires greenhouse and field trials with many events over multiple years, in multiple locations, and under a variety of conditions so that a significant amount of agronomic, phenotypic, and molecular data may be collected.
  • the resulting data and observations must then be analyzed by teams of scientists and agronomists with the goal of selecting a commercially suitable event.
  • Such an event once selected, may then be used for introgressing the desirable trait into other genetic backgrounds using plant breeding methods, and thus producing a number of different crop varieties that contain the desirable trait and are suitably adapted to specific local growing conditions.
  • a method for detecting a particular event may be helpful for complying with regulations requiring pre-market approval of sale of seeds to produce transgenic crop plants and foods derived from such plants, for example, or for use in environmental monitoring, monitoring traits in crops in field, or monitoring products derived from a crop harvest, as well as for use in ensuring compliance of parties subject to regulatory or contractual terms.
  • telomere telomere sequence region is interchangeable. As a result, such methods may not be useful for discriminating between separate events produced from the same DNA construct or very similar constructs.
  • PCR thermal amplification
  • the present invention provides a recombinant DNA comprising at least one junction sequence as set forth in SEQ ID NO: 7, SEQ ID NO: 8, SEQ ID NO: 9, SEQ ID NO: 10, SEQ ID NO: 11 and /or SEQ ID NO: 14, complements or fragments thereof comprising a transgene insertion and flanking genomic DNA of the brinjal event EE-6726.
  • the recombinant DNA of the present invention comprises at least one junction sequence as set forth in SEQ ID NO: 7, SEQ ID NO: 8, SEQ ID NO: 9, SEQ ID NO: 10, SEQ ID NO: 11 and /or SEQ ID NO: 14 comprises a sequence as set forth in SEQ ID NO: 12, and or its complement thereof, or a portion of SEQ ID NO: 12 or its complement thereof.
  • the recombinant DNA of the present invention comprises a primer sequence.
  • the nucleic acid sequence as set forth in SEQ ID NO: 14 comprises a primer sequence as set forth in SEQ ID NO: 1, SEQ ID NO: 3, SEQ ID NO: 13, SEQ ID NO: 15, and/or SEQ ID NO: 16 or its complements or fragments thereof.
  • the present invention further provides a primer comprising at least 10 contiguous nucleotides derived from the sequence as set forth in SEQ ID NO: 14, or its complement, wherein the said DNA molecule is capable of producing an amplicon comprising of sequence as set forth in SEQ
  • the primer of the present invention is a pair of primers comprising of at least 15 contiguous nucleic acids each, wherein a first primer in said pair is selected from nucleic acid sequence as set forth in SEQ ID NO: 1, SEQ ID NO: 3, SEQ ID NO: 15, and/or SEQ ID NO: 16; and a second primer sequence is as set forth in SEQ ID NO: 13, wherein said primer pair is capable of producing an amplicon comprising SEQ ID NO: 12 diagnostics for EE-6726 event.
  • the present invention provides a method of detecting the presence of EE-6726 event in a sample comprising the steps of contacting a sample comprising the DNA of interest with a first primer selected from SEQ ID NO: 1, SEQ ID NO: 3, SEQ ID NO: 15, and/or SEQ ID NO: 16; or its complements or fragments thereof; and a second primer sequence as set forth in SEQ ID NO: 13 or its complements or fragments thereof.
  • the sample is then amplified producing an amplicon having the sequence SEQ ID NO: 12 for the event EE-6726.
  • the amplified products are then analyzed and detected for the presence of diagnostic amplicon as set forth in SEQ ID NO: 12 for the EE-6726 event.
  • the DNA of interest comprises the sequences as set forth in SEQ ID NO: 7, SEQ ID NO: 8, SEQ ID NO: 9, SEQ ID NO: 10, SEQ ID NO: 11 and/or SEQ ID NO: 14, complements or fragments or combinations thereof.
  • the sample according to the present invention is a brinjal tissue.
  • the present invention provides a method of determining zygosity of DNA in a biological sample comprising the event EE6726.
  • the method comprises contacting the biological sample with a first DNA primer selected from the group consisting of SEQ ID NO: 1, SEQ ID NO:3, SEQ ID NO: 15, and/or SEQ ID NO: 16, complements or fragments or combinations thereof, a second DNA primer selected as set forth in SEQ ID NO: 13, complements or fragments thereof; and a third DNA primer as set forth in SEQ ID NO: 17, complements or fragments thereof.
  • the biological sample can be amplified to produce an amplicon.
  • the presence of said amplicon is detected where the presence of a DNA amplicon having a nucleotide sequence different from the nucleotide sequence comprising the amplicon sequence as set forth in SEQ ID NO: 12 is indicative of heterozygosity of the transgenic brinjal event EE6726.
  • the presence of a DNA amplicon having a nucleotide sequence identical to the nucleotide sequence comprising the amplicon sequence as set forth in SEQ ID NO: 12 is indicative of homozygosity of the transgenic brinjal event EE6726.
  • a DNA diagnostic kit for detecting the presence of EE-6726 event in a sample is provided.
  • the DNA detection kit comprises a first primer selected from SEQ ID NO: 1, SEQ ID NO:3, SEQ ID NO: 15, and/or SEQ ID NO: 16 or its complements or fragments thereof; and a second primer selected from SEQ ID NO: 13 or its complements or fragments thereof.
  • the sample is amplified with the said first and second primer producing an amplicon for the event EE-6726 for detecting the diagnostic amplicon as set forth in SEQ ID NO: 12.
  • the present invention also provides a method of producing a progeny of an insect resistant brinjal plant.
  • the method comprises producing insect resistant brinjal plant by incorporating nucleic acid sequences as set forth in SEQ ID NO:7, SEQ ID NO: 8, SEQ ID NO: 9, SEQ ID NO: 10, SEQ ID NO: 11 and/or SEQ ID NO: 14, complements or fragments thereof comprising the transgene insertion and flanking genomic DNA of the brinjal event EE6726 to brinjal plant genome.
  • the insect resistant brinjal plant comprising the EE-6726 event is crossed with a brinjal plant without the said event obtaining at least one progeny of brinjal plant derived from the said cross.
  • the progeny of brinjal plant is selected that is insect resistant and comprises nucleotide sequence of SEQ ID NO: 12.
  • an insect resistant brinjal plant or parts thereof is provided.
  • the brinjal plant according to the present invention comprises at least one nucleic acid sequence selected from the group of SEQ ID NO: 7, SEQ ID NO: 8, SEQ ID NO: 9, SEQ ID NO: 10, SEQ ID NO: 11 and/or SEQ ID NO: 14 forms a part of the plant's genome.
  • the present invention also provides a brinjal plant comprising a seed, nucleus, or part thereof capable of producing an amplicon comprising SEQ ID NO: 12 and diagnostic for EE-6726 event.
  • the seed of the brinjal plant of the present invention has an accession number NCIMB 41810. BRIEF DESCRIPTION OF THE DRAWINGS
  • Figure 1 is a map of the construct pMHO!OlO
  • Figure 2 is a digital image of gel of EE-6726 event using the event specific primers BRIEF DESCRIPTION OF THE SEQUENCES
  • SEQ ID NO: 1 is the nucleic acid sequence representing the 5' region of T-DNA expression cassette (MHIP-8 primer).
  • SEQ ID NO: 2 is the adapter primer sequence used for amplification of T-DNA flanking genomic DNA sequence (AP primer).
  • SEQ ID NO: 3 is the nucleic acid sequence representing the 5' region of T-DNA expression cassette (MfflP-9 primer).
  • SEQ ID NO: 4 is the adapter primer sequence used for amplification of T-DNA flanking genomic DNA sequence (NAP-primer).
  • SEQ ID NO: 5 is the nucleic acid sequence used for sequencing the amplified fragment cloned in pGEMT vector (T7 primer).
  • SEQ ID NO: 6 is the nucleic acid sequence used for sequencing the amplified fragment cloned in pGEMT vector (SP6 primer)
  • SEQ ID NO: 7 consists of a part of the adapter sequence (base pairs 1-30) adjacent to which is brinjal T-DNA flanking genomic DNA sequence of EE-6726 event (base pairs 31 to 368) from right border side the flanking genomic DNA sequence is followed by partial T-DNA sequence of the vector used for transformation of EE-6726 event (base pairs 369 to 798).
  • SEQ ID NO: 8 consists of brinjal T-DNA flanking genomic DNA sequence of EE-6726 event (base pairs 1 to 200) from right border side followed by partial T-DNA sequence of the vector used for transformation of EE-6726 event (base pairs 201 to 400).
  • SEQ ID NO: 9 consists of a brinjal T-DNA flanking genomic DNA sequence of EE-6726 event (base pairs 1 to 100) from right border side followed by partial T-DNA sequence of the vector used for transformation of EE-6726 event (base pairs 101 to 200).
  • SEQ ID NO: 10 consists of a brinjal T-DNA flanking genomic DNA sequence of EE-6726 event (base pairs 1 to 75) from right border side followed by partial T-DNA sequence of the vector used for transformation of EE-6726 event (base pairs 76 tol50).
  • SEQ ID NO: 11 consists of a brinjal T-DNA flanking genomic DNA sequence of EE-6726 event (base pairs 1 to 50) from right border side followed by partial T-DNA sequence of the vector used for transformation of EE-6726 event (base pairs 51 tolOO).
  • SEQ ID NO: 12 consists of a brinjal T-DNA flanking genomic DNA sequence of EE-6726 event (base pairs 1 to 10) from right border side followed by partial T-DNA sequence of the vector used for transformation of EE-6726 event (base pairs 11 to 20).
  • SEQ ID NO: 13 is reverse primer designed in the T-DNA flanking genomic DNA region (MHTBJ-11).
  • SEQ ID NO: 14 represents EE-6726 event T-DNA flanking genomic DNA starting from SEQ ID No.13 from to cry2Ab gene.
  • SEQ ID NO: 15 is a primer sequence designed in the T-DNA region which when used in combination with SEQ ID No: 13 would act as a diagnostic tool for identification of EE-6726 event.
  • SEQ ID NO: 16 is a primer sequence designed in the T-DNA region which when used in combination with SEQ ID No: 13 would act as a diagnostic tool for identification of EE-6726 event.
  • SEQ ID NO: 17 represents a part of the T-DNA flanking genomic DNA sequence of EE-6726 event from left border side. This is a primer sequence designed in the T-DNA region which when used in combination with SEQ ID No: 3 and SEQ ID No: 13 would act as a diagnostic tool for identification of EE-6726 event. (MHTBJ-8)
  • the term "event” refers to a DNA molecule comprising the inserted DNA and the flanking brinjal genomic DNA immediately adjacent to either side of the inserted DNA.
  • This DNA molecule is created by the act of inserting the transgenic DNA into the genome of the plant, i.e., by the act of transformation.
  • This DNA molecule therefore comprises a nucleic acid sequence that is both specific to the event and that is unique to the genome of the plant into which the transgenic DNA has been inserted, in that this nucleic acid sequence contains both the sequence of a particular region of plant genomic DNA and of the transgenic DNA insert.
  • the event comprises insertion of transgenic DNA into the chromosome/genome of the plant.
  • An “event” is produced by: (i) transformation of a plant cell with a nucleic acid construct that includes a transgene of interest, (ii) regeneration of a population of plants resulting from the insertion of the transgene into the genome of the plant, and (iii) selection of a particular plant characterized by insertion of the transgene into a particular location in the plant's genome.
  • the term “event” refers to the original transformant and any progeny produced by a sexual outcross between the original transformant or its descendants bearing the heterologous gene, and another brinjal variety.
  • brinjal means Solanum melongena and includes all plant varieties that can be bred with brinjal, including wild brinjal species as well as those plants belonging to Solanum that permit breeding between species.
  • “Fruit and shoot borer” refers to pests causing damage to brinjal. Larva bores into tender shoots and causes withering of terminal shoots / dead hearts - also bores petioles of leaves, flower buds and developing buds, causes withering of leaves, shedding of buds and make fruits unfit for consumption. Attacked fruits are with boreholes plugged with excreta. Fruits become out of shape also.
  • recombinant refers to a form of DNA and/or protein and/or an organism that would not normally be found in nature and as such was created by human intervention. Such human intervention may produce a recombinant DNA molecule and/or a recombinant plant.
  • a "recombinant DNA molecule” is a DNA molecule comprising a combination of DNA molecules that would not naturally occur together and is the result of human intervention, e.g., a DNA molecule that is comprised of a combination of at least two DNA molecules heterologous to each other, and/or a DNA molecule that is artificially synthesized and comprises a nucleic acid sequence that deviates from the nucleic acid sequence that would normally exist in nature, and/or a DNA molecule that comprises a transgene artificially incorporated into a host cell's genomic DNA and the associated flanking DNA of the host cell's genome.
  • a "recombinant plant” is a plant that would not normally exist in nature, is the result of human intervention, and contains a transgene and/or heterologous DNA molecule incorporated into its genome. As a result of such genomic alteration, the recombinant plant is distinctly different from the related wild type plant.
  • transgene refers to a nucleic acid molecule artificially incorporated into a host cell's genome. Such transgene may be heterologous to the host cell.
  • transgenic plant refers to a plant comprising such a transgene.
  • heterologous refers to a first molecule not normally found in combination with a second molecule in nature.
  • a molecule may be derived from a first species and inserted into the genome of a second species. The molecule would thus be heterologous to the host and artificially incorporated into a host cell's genome.
  • chimeric refers to a single DNA molecule produced by fusing a first DNA molecule to a second DNA molecule, where neither first nor second DNA molecule would normally be found in that configuration, i.e., fused to the other.
  • the chimeric DNA molecule is thus a new DNA molecule not otherwise normally found in nature.
  • DNA refers to a DNA molecule of genomic or synthetic origin, i.e., a polymer of deoxyribonucleic acid bases or a nucleic acid molecule, read from the 5 ' (upstream) end to the 3' (downstream) end.
  • DNA sequence refers to the nucleic acid sequence of a DNA molecule.
  • a “junction sequence” or “junction region” refers to the DNA sequence and/or corresponding DNA molecule that spans the inserted transgenic DNA and the adjacent flanking genomic DNA.
  • a “primer” is typically a highly purified, nucleic acid that is designed for use in specific annealing or hybridization methods that involve thermal amplification.
  • a pair of primers may be used with template DNA, such as a sample of brinjal genomic DNA, in a thermal amplification, such as polymerase chain reaction (PCR), to produce an amplicon, where the amplicon produced from such reaction would have a DNA sequence corresponding to sequence of the template DNA located between the two sites where the primers hybridized to the template.
  • template DNA such as a sample of brinjal genomic DNA
  • thermal amplification such as polymerase chain reaction (PCR)
  • an "amplicon” is a piece or fragment of DNA that has been synthesized using amplification techniques.
  • the term “amplicon” or “amplified DNA” refers to the product of nucleic acid amplification of a target nucleic acid sequence that is part of nucleic acid template.
  • the term "specific for (a target sequence)" indicates that a primer hybridizes under stringent hybridization conditions only to the target sequence in a sample comprising the target sequence.
  • DNA cassette refers to the DNA sequence with the promoter for driving the Heterologous Gene/DNA and an appropriate terminator which when present together regulates a gene expression.
  • progeny includes any plant, seed, plant cell, and/or regenerable plant part.
  • a “plant part” includes but are not limited to pollen, ovule, pod, flower, and root or stem tissue, fibers, and leaves. Plant parts may be viable, nonviable, regenerable, and/or non- regenerable.
  • the present invention provides a transgenic brinjal event EE-6726 that exhibits commercially acceptable tolerance to fruit and shoot borer. Brinjal, Solanum melongena, has been genetically modified to resist Lepidopteran pests, thus, to remove the negative impact on brinjal production by these pests. This was accomplished by the insertion of the DNA cassette that encodes the insecticidal Cry 2Ab protein from Bacillus thuringiensis .
  • This invention further relates to plants, plant parts, progeny plants which contain at least the nucleic acid sequences comprising the said DNA cassette, and to methods and compositions of matter for use in detecting the presence of said sequences in a sample.
  • the arrangement of the inserted DNA in brinjal event EE-6726 in relation to the surrounding brinjal plant genomic DNA is specific and unique for brinjal event EE-6726.
  • This DNA molecule is also an integral part of the brinjal chromosome of event EE-6726 containing plants and as such is static in the plant and may be passed on to progeny of the plant.
  • the present invention provides the original transformant that includes the transgene inserted into the particular location in the plant's genome and progeny of the transformant that include the transgene inserted into the particular location in the plant's genome.
  • progeny may be produced by a sexual outcross between the transformant, or its progeny, and another plant.
  • Such other plant may be a transgenic plant comprising the same or different transgene and/or a non-transgenic plant, such as one from a different variety. Even after repeated back-crossing to a recurrent parent, the inserted DNA and flanking DNA from the transformed parent is present in the progeny of the cross at the same genomic location.
  • Event EE-6726 comprises an integrated transgenic expression cassette that confers tolerance to fruit and shoot borer to the brinjal plant.
  • Cry2Ab Bacillus thuringiensis encoding crystal protein (Cry2Ab) that confers resistance to lepidopteran insects by selectively damaging their midgut lining.
  • Cry2Ab is endotoxins that act as insecticides.
  • Cry2Ab is useful for controlling a broad spectrum of pests.
  • the recombinant DNA described herein results from insertion of transgene into the brinjal genomic DNA, which may ultimately result in the expression of a recombinant RNA and/or protein molecule in that organism.
  • a recombinant plant is a brinjal plant described herein as comprising event EE-6726.
  • the present invention thus provides a recombinant DNA comprising at least one junction sequence and their corresponding nucleic acid sequences.
  • the junction sequences of the present invention is as set forth in SEQ ID NO: 7, SEQ ID NO: 8, SEQ ID NO: 9, SEQ ID NO: 10, SEQ ID NO: 11 and/or SEQ ID NO: 14, complements or fragments thereof comprising the transgene insertion and flanking genomic DNA of brinjal event EE-6726.
  • junction sequences of the present invention as set forth in SEQ ID NO: 7, SEQ ID NO: 8, SEQ ID NO: 9, SEQ ID NO: 10, SEQ ID NO: 11 and/or SEQ ID NO: 14, complements or fragments thereof are disclosed with reference to only one strand of the two complementary nucleic acid sequence strands.
  • the complementary sequences i.e. the sequences of the complementary strand
  • the reverse complementary sequences are within the scope of the invention and are expressly intended to be within the scope of the subject matter claimed.
  • the junction sequences may be arbitrarily represented by the nucleic acid sequence as set forth in SEQ ID NO: 7 consisting of a part of the adapter sequence (base pairs 1-30) adjacent to which is brinjal T-DNA flanking genomic DNA sequence of EE-6726 event (base pairs 31 to 368) from right border side.
  • the flanking genomic DNA sequence is followed by partial T-DNA sequence of the vector used for transformation of EE-6726 event (base pairs 369 to 798).
  • the junction sequence may be represented by the nucleic acid sequence as set forth in SEQ ID NO: 8 consisting of brinjal T-DNA flanking genomic DNA sequence of EE-6726 event (base pairs 1 to 200) from right border side followed by partial T-
  • the junction sequence may be represented by the nucleic acid sequence as set forth in SEQ ID NO: 9 consisting of brinjal T-DNA flanking genomic DNA sequence of EE- 6726 event (base pairs 1 to 100) from right border side followed by partial T-DNA sequence of the vector used for transformation of EE-6726 event (base pairs 101 to 200).
  • junction sequences may be represented by the nucleic acid sequence nucleic acid sequence as set forth in SEQ ID NO: 10 consisting of brinjal T-DNA flanking genomic DNA sequence of EE-6726 event (base pairs 1 to 75) from right border side followed by partial T-DNA sequence of the vector used for transformation of EE-6726 event (base pairs 76 to 150).
  • the junction sequences may be represented by the nucleic acid sequence nucleic acid sequence as set forth in SEQ ID NO: 11 consisting of brinjal T-DNA flanking genomic DNA sequence of EE-6726 event (base pairs 1 to 50) from right border side followed by partial T- DNA sequence of the vector used for transformation of EE-6726 event (base pairs 51 tolOO).
  • junction sequences may be represented by the nucleic acid sequence as set forth in SEQ ID NO: 14 consisting of EE-6726 event T-DNA flanking genomic DNA starting from SEQ ID No.13 to cry2Ab gene. These recombinant nucleic acids are present in brinjal EE- 6726 event as part of the genome.
  • the identification of one or more of nucleic acid sequence as set forth in SEQ ID NO: 7 or SEQ ID NO: 8 or SEQ ID NO: 9 or SEQ ID NO: 10 or SEQ ID NO: 11 or SEQ ID NO: 14 in a sample derived from a brinjal plant, seed, or plant part is determinative that the DNA was obtained from brinjal event EE-6726 and is diagnostic for the presence of brinjal event EE-6726.
  • the present invention provides at least one junction sequence as set forth in SEQ ID NO: 7, SEQ ID NO: 8, SEQ ID NO: 9, SEQ ID NO: 10, SEQ ID NO: 11 and/or SEQ ID NO: 14, comprises a sequence as set forth in SEQ ID NO: 12, and or the complement thereof, or a portion of SEQ ID NO: 12 or its complement or fragments thereof.
  • SEQ ID NO: 12 consists of brinjal T-DNA flanking genomic DNA sequence of EE-6726 event (base pairs 1 to 10) from right border side followed by partial T-DNA sequence of the vector used for transformation of EE-6726 event (base pairs 11 to 20).
  • the invention thus provides a DNA molecule that contains at least one of the nucleic acid sequence as set forth in SEQ ID NO: 7 or SEQ ID NO: 8 or SEQ ID NO: 9 or SEQ ID NO: 10 or SEQ ID NO: 11 or SEQ ID NO: 14.
  • Any segment of DNA derived from transgenic brinjal event EE-6726 that is sufficient to include at least one of the sequence as set forth in SEQ ID NO: 7 or SEQ ID NO: 8 or SEQ ID NO: 9 or SEQ ID NO: 10 or SEQ ID NO: 11 or SEQ ID NO: 14 and comprises SEQ ID NO: 12 is within the scope of the invention.
  • any nucleic acid comprising a sequence complementary to any of the sequences described within this paragraph is within the scope of the invention.
  • the nucleic acid sequence corresponding to the nucleic acid sequence of the inserted transgenic DNA and substantial segments of the brinjal genomic DNA flanking right border end of the inserted transgenic DNA is provided herein as SEQ ID NO: 12 or complement thereof.
  • a subsection of the inserted transgenic DNA is provided as SEQ ID NO: 7 or SEQ ID NO: 8 or SEQ ID NO: 9 or SEQ ID NO: 10 or SEQ ID NO: 11 or SEQ ID NO: 14 or complement thereof.
  • the brinjal event EE-6726 further comprises a region spanning the 5' end where the transgenic DNA is inserted into the genomic DNA, referred to herein as the 5' junction.
  • the sequence of the heterologous DNA inserts, junction sequences, or flanking sequences from brinjal event EE-6726 can be verified (and corrected if necessary) by amplifying such sequences from the event using primers derived from the sequences provided herein followed by standard DNA sequencing of the amplicon or of the cloned DNA.
  • the invention provides exemplary DNA molecules that can be used either as primers or probes for diagnosing the presence of DNA derived from a brinjal plant comprising event EE-6726 in a sample.
  • primers or probes are specific for a target nucleic acid sequence and as such are useful for the identification of brinjal event EE-6726 nucleic acid sequence by the methods of the invention described herein.
  • a primer can be typically designed to hybridize to a complementary target DNA strand to form a hybrid between the primer and the target DNA strand, and the presence of the primer is a point of recognition by a polymerase to begin extension of the primer (i.e., polymerization of additional nucleic acids into a lengthening nucleic acid molecule) using as a template the target DNA strand.
  • the present invention thus provides recombinant DNA wherein the nucleic acid sequence as set forth in SEQ ID NO: 14 comprises a primer sequence as set forth in SEQ ID NO: 1, SEQ ID NO: 3, SEQ ID NO: 13, SEQ ID NO: 15, and/or SEQ ID NO: 16 or its complements or fragments thereof.
  • the primer sequences of the present invention can be used specifically in combinations to amplify the transgenic insertion locus for use as a diagnostic tool.
  • the primers of the present invention were designed to amplify the transgenic insertion locus for use as a diagnostic tool.
  • any primer pair derived from SEQ ID NO: 14 that when used in DNA amplification reaction produces a DNA amplicon consisting of SEQ ID 12 is diagnostic for EE-6726 event is an aspect of the present invention. Any modification of the method of the present invention that use DNA molecules or complements thereof to produce an amplicon DNA molecule diagnostic for EE-6726 event can be apparent to the person ordinarily skilled of the art.
  • the present invention further provides that primers comprising at least 10 contiguous nucleotides selected from a sequence as set forth in SEQ ID NO: 14, or its complement, wherein the said DNA molecule is capable of producing an amplicon comprising of sequence as set forth in SEQ ID NO: 12.
  • the primers can be a pair comprising at least 15 contiguous nucleic acids each.
  • the primer can comprise a first primer and a second primer.
  • the first primer is a forward primer and the second primer is a reverse primer.
  • the primer pairs of the present invention can be used for diagnosis of the event.
  • the first primer in said pair can be selected from nucleic acid sequence as set forth in SEQ ID NO: 1, SEQ ID NO: 3, SEQ ID NO: 15, and/or SEQ ID NO: 16.
  • the second primer sequence can be as set forth in SEQ ID NO: 13.
  • a primer pair is capable of producing an amplicon comprising SEQ ID NO: 12 diagnostics for EE-6726 event.
  • the first primer in said pair can be a nucleic acid sequence as set forth in SEQ ID NO: 3 and the second primer sequence can be SEQ ID NO: 13, wherein said primer pair is capable of producing an amplicon comprising SEQ ID NO: 12 diagnostics for EE-6726 event. If SEQ ID NO: 13 primer if used with SEQ ID No: 15 will produce an amplicon of 1150 base pair, or with SEQ ID NO: 16 will amplify 1420 base pair from EE-6726 event.
  • Primer pairs are intended to refer to use of two primers binding to the opposite strands of a double stranded nucleic acid segment for the purpose of amplifying linearly the nucleic acid segment between the positions targeted for binding by the individual members of the primer pair, typically in a thermal amplification reaction or other conventional nucleic-acid amplification methods.
  • Exemplary DNA molecules useful as primers as set forth in SEQ ID NO: 1, SEQ ID NO: 3, SEQ ID NO: 13, SEQ ID NO: 15, and/or SEQ ID NO: 16 or its complements or fragments thereof.
  • DNA molecules, or fragment thereof can also be obtained by other techniques such as by directly synthesizing the fragment by chemical means, as is commonly practiced by using an automated oligo nucleic acid synthesizer.
  • the DNA molecules and corresponding nucleic acid sequences provided herein are therefore useful for, among other things, identifying brinjal event EE-6726, selecting plant varieties or hybrids comprising brinjal event EE-6726, detecting the presence of DNA derived from the transgenic brinjal event EE-6726 in a sample, detecting the presence of DNA derived from the transgenic brinjal event EE-6726 along with any other brinjal event in a sample and monitoring samples for the presence and/or absence of brinjal event EE-6726 or plant parts derived from brinjal plants comprising event EE-6726.
  • a method of detecting the presence of EE-6726 event in a sample comprises contacting a sample comprising the DNA of interest with a first primer selected from SEQ ID NO: 1, SEQ ID NO: 3, SEQ ID NO: 15, and/or SEQ ID NO: 16; or its complements or fragments thereof; and a second primer sequence as set forth in SEQ ID NO: 13 or its complements or fragments thereof.
  • the sample is amplified producing an amplicon having the sequence SEQ ID NO: 12 for the event EE-6726.
  • the amplified product is analyzed for the presence of SEQ ID NO: 12 for the EE-6726 event.
  • the diagnostic amplicon is detected as set forth in SEQ ID NO: 12.
  • the sample comprising the DNA of interest can include a recombinant DNA molecule as set forth in SEQ ID NO: 7, SEQ ID NO: 8, SEQ ID NO: 9, SEQ ID NO: 10, SEQ ID NO: 11 and/or SEQ ID NO: 14 and/or complements or fragments or combinations thereof.
  • the sample can be a brinjal tissue.
  • the detection of a nucleic acid sequence specific for event EE-6726 in the amplicon is determinative and/or diagnostic for the presence of the brinjal event EE-6726 specific DNA in the sample.
  • Other primer pairs may be readily designed by one skilled in the art.
  • the present invention provides a method of determining zygosity of DNA in a biological sample comprising the event EE6726.
  • the method according to the present invention comprises contacting the biological sample with a first DNA primer selected from the group consisting of SEQ ID NO: 1, SEQ ID NO:3, SEQ ID NO: 15, and/or SEQ ID NO: 16, complements or fragments or combinations thereof, a second DNA primer selected as set forth in SEQ ID NO: 13, complements or fragments thereof; and a third DNA primer as set forth in SEQ ID NO: 17, complements or fragments thereof.
  • the sample containing DNA is then amplified to produce an amplicon.
  • the presence of said DNA amplicon molecule is detected by gel electrophoresis.
  • the presence of more than one DNA amplicon band is indicative of heterozygosity of the transgenic brinjal event EE-6726.
  • the presence of one DNA amplicon band comprising of sequence as set forth in SEQ ID No.12 is indicative of homozygosity of the transgenic brinjal event EE-6726.
  • homozygosity is desirable in transgenic plants to ensure the stable integration and inheritance of transgene.
  • the method of the present invention provides a simple and cost-effective method of determining zygosity of DNA in a biological sample comprising the event EE-6726.
  • a DNA diagnostic kit for detecting the presence or EE-6726 comprises a primer pair useful for producing an amplicon comprising SEQ ID No. 12 useful for detecting the presence and/or absence of DNA derived from transgenic brinjal event EE-6726 in a sample.
  • Such a kit would employ a method comprising contacting a target DNA sample with a primer pair as described herein, then performing a nucleic acid amplification reaction sufficient to produce an amplicon comprising a DNA molecule having SEQ ID NO: 12; having at least one nucleic acid sequence as set forth in SEQ ID NO:7, SEQ ID NO: 8, SEQ ID NO: 9, SEQ ID NO: 10, SEQ ID NO: 11 and/or SEQ ID NO: 14 or complement thereof, and then detecting the presence and/or absence of the amplicon.
  • Such a method may also include sequencing the amplicon or a fragment thereof, which would be determinative of, i.e. diagnostic for, the presence of the brinjal event EE-6726 specific DNA in the target DNA sample.
  • the DNA diagnostic kit comprises a first primer selected from SEQ ID NO: 1, SEQ ID NO:3, SEQ ID NO: 15, and/or SEQ ID NO: 16 or its complements or fragments thereof; and a second primer selected from SEQ ID NO: 13 or its complements or fragments thereof.
  • the sample is amplified with the said first and second primer producing an amplicon for the event EE-6726 for detecting the diagnostic amplicon as set forth in SEQ ID NO: 12.
  • the diagnostic kit for detecting the detecting the presence of EE- 6726 event in a sample comprises a forward primer selected from SEQ ID NO: 3 or its complements or fragments thereof; and a reverse primer selected from SEQ ID NO: 13 or its complement or fragments thereof.
  • DNA detection kits are provided that are useful for the identification of brinjal event EE-6726 DNA in a sample and can also be applied to methods for breeding brinjal plants containing the appropriate event DNA.
  • Such kits contain DNA primers and/or probes comprising fragments of nucleic acid sequence as set forth in SEQ ID NO:l, SEQ ID NO: 3, SEQ ID NO: 13, SEQ ID NO: 15; and/or SEQ ID NO: 16 or its complement or fragments thereof.
  • Nucleic-acid amplification can be accomplished by any of the various nucleic- acid amplification methods known in the art, including thermal amplification methods. Many techniques are known in the art for detecting, quantifying, and/or sequencing the amplicon produced by these methods.
  • kits and detection methods of the invention are useful for, among other things, identifying brinjal event EE-6726, selecting plant varieties or hybrids comprising brinjal event EE-6726, detecting the presence of DNA derived from the transgenic brinjal plants comprising event EE- 6726 in a sample, and monitoring samples for the presence and/or absence of brinjal plants comprising event EE-6726 or plant parts derived from brinjal plants comprising event EE-6726.
  • the present invention also provides a method of producing a progeny of an insect resistant brinjal plant. The method of producing a transgenic brinjal plant resistant to insect pests comprising transforming a brinjal cell with the DNA construct pMHOlOlO.
  • the method comprises producing insect resistant brinjal plant by incorporating nucleic acid sequences as set forth in SEQ ID NO: 7, SEQ ID NO: 8, SEQ ID NO: 9, SEQ ID NO: 10, SEQ ID NO:l 1 and/or SEQ ID NO: 14, complements or fragments thereof comprising the transgene insertion and flanking genomic DNA of the brinjal event EE-6726 to brinjal plant genome.
  • the progeny of brinjal plant is selected that is insect resistant and comprises nucleotide sequence of SEQ ID NO: 12.
  • the present invention provides an insect resistant brinjal plant, or parts thereof.
  • the present invention also provides an insect resistant transgenic brinjal plant comprising an event EE-6726.
  • the present invention relates to an insect resistant transgenic brinjal plant comprising an elite event EE-6726.
  • the transgenic plant is characterized by harboring the cry2Ab gene under the control of CaMV e35S promoter at a specific locus in the brinjal genome.
  • the invention discloses a method for detection of an event EE-6726 in transgenic brinjal plant.
  • the invention further provides a kit for identification of the transgenic plants comprising the event EE-6726.
  • the brinjal plant according to the present invention comprises at least one nucleic acid sequence selected from the group of SEQ ID NO: 8, SEQ ID NO: 9, SEQ ID NO: 10, SEQ ID NO: 11 and/or SEQ ID NO: 14 forms a part of the plant's genome.
  • the present invention also provides a brinjal plant, seed, nucleus, or part thereof comprising at least one nucleic acid sequence selected from the group of SEQ ID NO: 7, SEQ ID NO: 8, SEQ ID NO: 9, SEQ ID NO: 10, SEQ ID NO: 11 and/or SEQ ID NO: 14 that is capable of producing an amplicon comprising SEQ ID NO: 12 and diagnostic for EE-6726 event.
  • the seed according to the present invention is capable of producing an amplicon comprising SEQ ID NO: 12 and is diagnostic for EE-6726 event and having an accession number NCIMB 41810.
  • the invention thus provides brinjal plants, progeny, seeds, plant cells, and plant parts (such as pollen, ovule, pod, flower tissue, root tissue, stem tissue, and leaf tissue).
  • These plants, progeny, seeds, plant cells, plant parts, and commodity products contain a detectable amount of a nucleic acid of the invention, i.e., such as a nucleic acid having at least one of the nucleic acid sequence as set forth in SEQ ID NO: 7, SEQ ID NO: 8, SEQ ID NO: 9, SEQ ID NO: 10, SEQ ID NO: 11 and /or SEQ ID NO: 14, complements or fragments thereof.
  • Plants, progeny, seeds, plant cells, and plant parts of the invention may also contain one or more additional transgenes.
  • transgene may be any nucleic acid sequence encoding a protein or RNA molecule conferring a desirable trait including but not limited to increased insect resistance, increased water use efficiency, increased yield performance, increased drought resistance, increased seed quality, improved nutritional quality, and/or increased herbicide tolerance, in which the desirable trait is measured with respect to a brinjal plant lacking such additional transgene.
  • the present invention provides brinjal plants, progeny, seeds, plant cells, and plant part such as pollen, ovule, pod, flower, root or stem tissue, and leaves derived from a transgenic brinjal plant comprising event EE-6726.
  • a representative sample of brinjal seed comprising event EE-6726 has been deposited according to the Budapest Treaty with the National Collection of Industrial, Food and Marine Bacteria (NCIMB).
  • the NCIMB repository has assigned the Patent Deposit Designation 41810 to the event EE-6726 comprising seed.
  • Plants of the present invention may pass along the event DNA, including the transgene, to progeny.
  • the progeny comprising the event DNA derived from an ancestor plant and/or comprising a DNA molecule having at least one nucleic acid sequence as set forth in SEQ ID NO: 7, SEQ ID NO: 8, SEQ ID NO: 9, SEQ ID NO: 10, SEQ ID NO: 11 and /or SEQ ID NO: 14, complements or fragments thereof.
  • Plants, progeny, and seeds may be homozygous or heterozygous for the transgene.
  • Progeny may be grown from seeds produced by a brinjal event EE-6726 containing plant and/or from seeds produced by a plant fertilized with pollen from a brinjal event EE-6726 containing plant.
  • a varietal or hybrid seed or plant of the present invention may thus be derived by crossing a first parent that lacks the specific and unique DNA of the brinjal event EE-6726 with a second parent comprising brinjal event EE-6726, resulting in a hybrid comprising the specific and unique DNA of the brinjal event EE-6726.
  • Each parent can be a hybrid or an inbred/varietal so long as the cross or breeding results in a plant or seed of the invention, i.e., a seed having at least one allele containing the DNA of brinjal event EE-6726 and/or a DNA molecule having at least one nucleic acid sequence as set forth in SEQ ID NO: 7 or SEQ ID NO: 8 or SEQ ID NO: 9 or SEQ ID NO: 10 or SEQ ID NO: 11 and /or SEQ ID NO: 14.
  • Two different transgenic plants may thus be crossed to produce hybrid offspring that contain two independently segregating, added, exogenous genes.
  • the EE-6726 containing fruit and shoot borer tolerant brinjal can be crossed with other transgenic brinjal plants to produce a plant having the characteristics of both transgenic parents.
  • One example of this would-be a cross of EE-6726 containing fruit and shoot borer tolerant brinjal with a plant having one or more additional traits such as herbicide tolerance and/or insect control, resulting in a progeny plant or seed that is tolerant to fruit and shoot borer and has at least one or more additional traits.
  • Back-crossing to a parental plant and out-crossing with a non-transgenic plant are also contemplated, as is vegetative propagation.
  • the invention provides methods for controlling insects and methods for producing plants with brinjal event EE-6726.
  • a method for controlling insects in a field is provided and consists of planting brinjal event EE-6726 containing varietal or hybrid plants in a field and exposing plants to fruit and shoot borer in the field without injuring the EE-6726 containing plants.
  • a brinjal plant that tolerates fruit and shoot borer may be produced by sexually crossing an event EE-6726 containing plant comprising a DNA molecule having at least one nucleic acid sequence as set forth in SEQ ID NO: 7 or SEQ ID NO: 8 or SEQ ID NO: 9 or SEQ ID NO: 10 or SEQ ID NO: 11 or SEQ ID NO: 14 with another brinjal plant and thereby producing seed, which is then grown into progeny plants.
  • These progeny plants may then be exposed to fruit and shoot borer to select the progeny plants that are tolerant to fruit and shoot borer insects.
  • these progeny plants may be analyzed using diagnostic methods to select the progeny plants that contain the event EE-6726 DNA.
  • the other plant used in the crossing may or may not be tolerant to fruit and shoot borer and may or may not be transgenic.
  • the progeny plant and/or seed produced may be varietal or hybrid seed.
  • the step of sexually crossing one plant with another plant, i.e., cross-pollinating may be accomplished or facilitated by human intervention, for example: by human hands collecting the pollen of one plant and contacting this pollen with the style or stigma of a second plant; by human hands and/or actions removing, destroying, or covering the stamen or anthers of a plant (e.g., by detasseling or by application of a chemical gametocide) so that natural self-pollination is prevented, and cross-pollination would have to take place in order for fertilization to occur; by human placement of pollinating insects in a position for "directed pollination" (e.g., by placing beehives in orchards or fields or by caging plants with pollinating insects); by human opening or removing of parts
  • a brinjal plant that is tolerant to brinjal fruit and shoot borer may be produced by selfing an event EE-6726 containing plant comprising a DNA molecule having at least one nucleic acid sequence as set forth in SEQ ID NO: 7 or SEQ ID NO: 8 or SEQ ID NO: 9 or SEQ ID NO: 10 or SEQ ID NO: 11 or SEQ ID NO: 14 and thereby producing seeds, which is then grown into progeny plants. These progeny plants may then be exposed to fruit and shoot borer to select for progeny plants that are tolerant to fruit and shoot borer. Alternatively, these progeny plants may be analyzed using diagnostic methods to select for progeny plants that contain the event EE-6726 DNA.
  • the step of sexually crossing one plant with itself may be accomplished or facilitated by human intervention, for example: by human hands collecting the pollen of the plant and contacting this pollen with the style or stigma of the same plant and then optionally preventing further fertilization of the plant; by human hands and/or actions removing, destroying, or covering the stamen or anthers of other nearby plants (e.g., by detasseling or by application of a chemical gametocide) so that natural cross-pollination is prevented and self-pollination would have to take place in order for fertilization to occur; by human placement of pollinating insects in a position for "directed pollination" (e.g., by caging a plant alone with pollinating insects); by human manipulation of the flower or its parts to allow for self-pollination; by selective placement of plants (e.g., intentionally planting plants beyond pollinating proximity); and/or by application of chemicals to precipitate flowering or to foster
  • human intervention for example: by human hands collecting the pollen of the plant and contacting this
  • Progeny of brinjal plants and seeds encompassed by these methods and produced by using these methods will be distinct from other brinjal plants, for example because the progeny of brinjal plants and seeds: are recombinant and as such created by human intervention; are fruit and shoot borer tolerant; contain at least one allele that consists of the transgene DNA of the invention; and/or contain a detectable amount of a DNA molecule comprising at least one nucleic acid sequence as set forth in SEQ ID NO: 7 or SEQ ID NO: 8 or SEQ ID NO: 9 or SEQ ID NO: 10 or SEQ ID NO: 11 or SEQ ID NO: 14.
  • a seed may be selected from an individual progeny plant, and so long as the seed comprises a DNA molecule having at least one nucleic acid sequence as set forth in SEQ ID NO: 7 or SEQ ID NO: 8 or SEQ ID NO: 9 or SEQ ID NO: 10 or SEQ ID NO: 11 or SEQ ID NO: 14, it will be within the scope of the invention.
  • the invention provides a transgenic plant comprising a DNA molecule having at least one nucleic acid sequence as set forth in SEQ ID NO: 7 or SEQ ID NO: 8 or SEQ ID NO: 9 or SEQ ID NO: 10 or SEQ ID NO: 11 or SEQ ID NO: 14present in its genome.
  • transgenic plant cell that is separate and unique from naturally occurring plant cells.
  • This transgenic plant cell can then be cultured using modem techniques.
  • the new plant cell's genetic composition and phenotype is a technical effect created by the integration of the heterologous DNA into the genome of the cell.
  • Another aspect of the invention is a method using modem plant tissue culture techniques to produce transgenic plants.
  • the methods of the invention are therefore useful for, among other things, controlling insects in a field while growing plants for the purpose of producing seed and/or plant parts comprising brinjal event EE-6726 for agricultural or research purposes, selecting for progeny comprising brinjal event EE-6726 for plant breeding or research purposes, and producing progeny plants and seeds comprising brinjal event EE-6726.
  • the plants, progeny, seeds, plant cells, plant parts (such as pollen, ovule, pod, flower, root or stem tissue, and leaves), and commodity products of the invention may be evaluated for DNA composition, gene expression, and/or protein expression. Such evaluation may be done by using any standard method such as PCR, for detection and/or the detection kits provided herein.
  • the present invention provides efficient method for transforming plant, plant cells and tissues of brinjal ( Solanum melongena ) using Agrobacterium mediated method for conferring resistance to insect pests.
  • Agrobacterium tumefaciens strain LBA4404 can be used.
  • the strain of Agrobacterium tumefaciens can be obtained from commercial sources known to a person skilled in the art. Some commonly available commercial strains are EHA 101, EHA 105, LB A 4404 and the like.
  • the DNA cassette was inserted into the genome of brinjal through Agrobacterium transformation using a DNA fragment derived from vector pMHOlOlO to produce brinjal event
  • the method of producing a transgenic Brinjal plant resistant to insect pests comprising transforming a brinjal cell with the DNA construct pMHOlOlO.
  • the fertile brinjal plant obtained from the said brinjal cell can be self-pollinated or crossed with compatible brinjal varieties to produce insect resistant brinjal plant.
  • Insecticidal cry2Ab gene from Bacillus thuringiensis has been transferred into brinjal line BJ60208 developed by MAHYCO.
  • the present invention provides an efficient method for transforming plant, plant cells and tissues of brinjal (Solanum melongena) plant using Agrobacterium- mediated transformation method for conferring resistance to insect pests.
  • the vector pMHOlOlO ( Figure 1) containing cry2Ab gene under the control of CaMVe35S promoter and vel0518 terminator; was transformed in the Agrobacterium tumefaciens cells.
  • the recombinant Agrobacterium tumefaciens was inoculated into a suitable medium for its growth.
  • Agrobacterium cells were inoculated into 25 ml of sterile LB medium (Table 1) at 28°C with shaking at 175 rpm with the respective antibiotics.
  • the explants for transformation are selected from a group consisting of cotyledon with petiole, hypocotyls, embryo, immature embryo, leaf lamina, cotyledonary axil, shoot tip, anther, root and callus or any other suitable explant.
  • the details of the transformation of the brinjal (Solanum melongena) plant are provided in Example 1.
  • Explants were inoculated in recombinant Agrobacterium suspension (preferably 15 minutes), blotted dry on sterile fdter paper and later transferred to petri plates containing suitable growth medium for co- cultivation.
  • Another embodiment of the present invention is to provide a method of identification of the flanking sequence around the transgenic insertion site for the event EE-6726 by PCR amplification.
  • Nucleic acid amplification can be accomplished by any of the various nucleic acid amplification methods known in the art, including the polymerase chain reaction (PCR).
  • Transgenic insertion and neighboring flanking brinjal DNA were purified by agarose gel electrophoresis and cloned.
  • the cloned fragment was sequenced by methods known in the art.
  • the sequence flanking the junction of the insertion is shown in nucleic acid sequence as set forth in SEQ ID NO: 7 or SEQ ID NO: 8 or SEQ ID NO: 9 or SEQ ID NO: 10 or SEQ ID NO: 11 or SEQ ID NO: 14.
  • Another embodiment of the present invention is to provide diagnostic methods for identification of the EE-6726 event. Details of PCR method of identification of the EE-6726 event are given in
  • the present invention also provides a synthetic oligo nucleic acid for the detection of the presence of brinjal plant EE-6726 event, wherein the sequence of said oligo nucleic acid is selected from a group consisting nucleic acid sequence as set forth in SEQ ID NO: 7 or SEQ ID NO: 8 or SEQ ID NO: 9 or SEQ ID NO: 10 or SEQ ID NO: 11 or SEQ ID NO: 14.
  • the present invention further relates to a transgenic plant or seed having the brinjal plant EE- 6726 event, wherein the genome of said EE-6726 event comprises of nucleic acid sequence as set forth in SEQ ID NO: 7 or SEQ ID NO: 8 or SEQ ID NO: 9 or SEQ ID NO: 10 or SEQ ID NO:
  • SEQ ID NO: 14 comprising of SEQ ID NO: 12 or complement thereof. While the invention is broadly as defined above, it will be appreciated by those persons skilled in the art that it is not limited thereto and that it also includes embodiments of which the following description gives examples. The following examples are included to demonstrate examples of certain preferred embodiments of the invention. It should be appreciated by those of skill in the art that the techniques disclosed in the examples that follow represent approaches the inventors have found function well in the practice of the invention, and thus can be considered to constitute examples of preferred modes for its practice. However, those of skill in the art should, in light of the present disclosure, appreciate that many changes can be made in the specific embodiments that are disclosed and still obtain a like or similar result without departing from the spirit and scope of the invention.
  • cry2Ab gene of Bacillus thruingiensis has been transferred into brinjal line 60208 developed by MAHYCO which has the following characters: Fruit color: Purple, white variegated Fruit shape: Oval Plant habit: Bushy Fruit development: In clusters Calyx: Spiny
  • Nucleic acid amplification can be accomplished by any of the various nucleic acid amplification methods known in the art, including the polymerase chain reaction (PCR).
  • PCR polymerase chain reaction
  • a variety of amplification methods are known in the art and are described in PCR protocols: a guide to methods and applications (ed. Innis et al, Academic Press, San Diego, 1990).
  • Transgenic insertion and neighboring flanking brinjal DNA were purified by agarose gel electrophoresis and cloned. The cloned fragment was sequenced by methods known in the art.
  • the overnight grown bacterial culture was centrifuged at 10000 rpm for 10 min. The supernatant was discarded, and the pellet resuspended in liquid.
  • MS medium 25 ml
  • mixed well Table 1). 25 m ⁇ of lOOmM acetosyringone was added to the bacterial culture which was then placed in the incubator for growth with shaking for a further 2 hr. The optical density (OD) of the bacterial culture was measured at 600 nm until an OD of 1.5 to 1.8 was reached.
  • the explants were incubated in the bacterial culture in a petri dish or a glass beaker for 10 min with slow stirring.
  • explants were then blotted on a sterile filter paper to remove excess bacteria and placed on co-cultivation medium BlAsP (Please find the media composition in table) for the three days for co-cultivation. (15 explants/ plate).
  • the plates were incubated under light at 25°C for three days with a photoperiod regime of 16 hrs light + 8 hrs darkness.
  • Positive and negative controls were also maintained in each experiment. Positive controls were explants regenerated on medium without antibiotics to check the tissue culture regeneration, whereas negative controls are explants maintained on antibiotic-containing media to make sure the antibiotic is checking the growth.
  • the shoot buds were transferred onto B3KC medium (Table 1) with kanamycin 50 mg/lit and cefotaxime 250mg/l for a period of 2 weeks.
  • the shoot buds were twice subcultured every 2 weeks (2 selections) on fresh medium.
  • the shoot buds elongate and are ready for rooting. Sometimes on the elongation medium rooting may begin. If rooting starts on the elongation medium the plantlets were left undisturbed in order to avoid damage to the roots. Rooting (B4KC medium)
  • the shoots were transferred onto rooting medium B4KC (Table 1) with kanamycin 50 mg/1 and cefotaxime 250mg/li for a period of 2 weeks. The shoots were subcultured every 2 weeks till rooting occurred.
  • cry2Ab acts as a dominant gene when introduced as a transgene
  • the expression of the gene was monitored by ELISA in the T1 generation. Again, in a single insertion event, the expected ratio of Cry2Ab expressing plants to non-expressing plants is 3:1.
  • Insect bioassays were carried out on tissue from selected lines in order to determine which lines would have better efficacy against the fruit and shoot borer pest. Southern blot analysis of selected individual transformation events was carried out to confirm the number of loci (insert copy number) at which the transgene integrated in the brinjal genome.
  • transformed lines were selected which displayed segregation characteristics of single locus insertion events and showed effective tolerance to fruit and shoot borer. Conversely, those lines that were found to have abnormal segregation ratios and/or low efficacy against the pest were not taken further.
  • the lines selected for advancement were grown in the greenhouse and Cry2Ab protein was estimated through the life of the crop by quantitative
  • event EE-6726 was found to be the best available event, in terms of Cry2Ab expression, efficacy against the pest and genetic stability over three generations. Marker-free status of the selected event was confirmed by various analysis such as PCR, GETS assays, kanamycin sensitivity test and Southern hybridisation. The EE-6726 elite event was used for further breeding for developing fruit and shoot borer tolerant brinjal.
  • the transgenic brinjal event EE-6726 was analyzed to identify brinjal genomic DNA sequences flanking the cry2Ab gene expression cassette using the method of Cottage et al., (Plant Molecular Biology Reporter, December 2001).
  • Plant genomic DNA was extracted from fresh young leaves of EE-6726 event bearing plants using the method known in the art. Genomic DNA (2pg) was digested with EcoR V enzyme in 20 m ⁇ of reaction volume using standard buffers. The digestion reaction was incubated at 37° C overnight. The digestion product was then incubated at 80° C for enzyme inactivation and was precipitated with 3M sodium acetate and ethanol. DNA was air dried and dissolved in 23 m ⁇ sterile distilled water. Digested DNA was ligated to the annealed adapter in ligase buffer supplied by the manufacturer. The sequences of the adapters are as below
  • ADAP 2 5’- P-acc tgc cc-H2N -3’ Both the adapters were at first annealed to each other and then ligated to the digested genomic
  • the ligation mixture was incubated at 16°C for overnight and was diluted to 100 m ⁇ using sterile water.
  • the adapter library was subjected to first round of PCR amplification using the following primer combination MfflP-8 - 5’- CCA GTC CGG TGT AAG AAC GG -3’ SEQ ID NO: 1
  • the second round of PCR was carried out to amplify the specific flanking region adjacent to the inserted heterologous gene.
  • the template used for second round PCR was first round PCR product which was diluted 5 times. The details of the PCR are given below: MfflP-9 - 5 ’ - AAG AAC GGG TCT GTC CAT CC -3 ’ SEQ ID NO: 3
  • the PCR product was analyzed on a 1% agarose gel, and the amplified fragment was eluted from the agarose gel using a Qiagen DNA gel elution kit.
  • the amplified fragment was cloned into pGEM-T Easy vector to obtain a recombinant clone. Plasmid DNA from this clone was isolated using standard methods known in the art.
  • the cloned fragment was sequenced using T7 (SEQ ID NO: 5) and SP6 (SEQ ID NO: 6) primers.
  • the sequences of T7 and SP6 primers are as below; T7:- 5’- TAA TAC GAC TCA CTA TAG GG - 3 ’ SEQ ID NO: 5
  • Sequence in bold font at the start is the adapter sequence whereas the sequence base pairs 369 to 798 at the end is T-DNA vector sequence; the sequence in regular font represents the brinjal genomic DNA sequence flanking the EE-6726 event T-DNA region from right border side.
  • Sequence ID NO: 7 consists of a part of the adapter sequence (base pairs 1-30) adjacent to which is brinjal T-DNA flanking genomic DNA sequence of EE-6726 event (base pairs 31 to 368) from right border side The flanking genomic DNA sequence is followed by partial T-DNA sequence of the vector used for transformation of EE-6726 event (base pairs 369 to 798).
  • GAAA Sequence ID NO: 8 consists of brinjal T-DNA flanking genomic DNA sequence of EE-6726 event (base pairs 1 to 200) from right border side followed by partial T-DNA sequence of the vector used for transformation of EE-6726 event (base pairs 201 to 400).
  • SEQ ID NO: 9
  • Sequence ID NO: 9 consists of brinjal T-DNA flanking genomic DNA sequence of EE-6726 event (base pairs 1 to 100) from right border side followed by partial T-DNA sequence of the vector used for transformation of EE-6726 event (base pairs 101 to 200).
  • SEQ ID NO: 10 consists of brinjal T-DNA flanking genomic DNA sequence of EE-6726 event (base pairs 1 to 100) from right border side followed by partial T-DNA sequence of the vector used for transformation of EE-6726 event (base pairs 101 to 200).
  • Sequence ID NO: 10 consists of brinjal T-DNA flanking genomic DNA sequence of EE-6726 event (base pairs 1 to 75) from right border side followed by partial T-DNA sequence of the vector used for transformation of EE-6726 event (base pairs 76 tol50).
  • SEQ ID NO: 11 SEQ ID NO: 12
  • ACT GAT AGTTT A AACT GAAGGCGGGAAAC GAC AATC TGAT CAT Sequence ID NO: 11 consists of brinjal T-DNA flanking genomic DNA sequence of EE-6726 event (base pairs 1 to 50) from right border side followed by partial T-DNA sequence of the vector used for transformation of EE-6726 event (base pairs 51 tolOO).
  • Sequence ID NO: 12 consists of brinjal T-DNA flanking genomic DNA sequence of EE-6726 event (base pairs 1 to 10) from right border side followed by partial T-DNA sequence of the vector used for transformation of EE-6726 event (base pairs 11 to 20).
  • Example 4 Diagnostic methods for identification of the EE-6726 event
  • the sequence analysis of the fragment shown as SEQ ID NO: 7 were carried out and primers were designed to amplify the transgenic insertion locus for use as a diagnostic tool. The two primers were used to amplify the transgenic insertion locus.
  • the forward primer MHIP-9 (SEQ ID No.3) was designed in the EE-6726 T-DNA region while the reverse primer was designed in the T-DNA flanking genomic DNA region and was named as MHTBJ-11.
  • the sequence of MHTBJ-11 primer is provided below as SEQ ID NO.13.
  • primer pairs include, but are not limited to, SEQ ID NO: 3 and SEQ ID NO: 13.
  • SEQ ID No.14 consisting of EE-6726 event T-DNA flanking genomic DNA starting from SEQ ID No.13 from to cry2Ab gene.
  • Example 5 Zygosity assay for brinjal EE-6726 elite event
  • Brinjal genomic DNA sequence flanking the left border region of the T-DNA was analyzed and a primer was designed having nucleotide sequence as shown in SEQ ID NO: 17.
  • This primer when used in combination with the primers having nucleotide sequence as set forth in SEQ ID NO: 3 and SEQ ID NO: 13 obtained 653 base pairs fragment from the transgenic brinjal plant comprising EE-6726 elite event due to amplification of the transgene specific allele and a 382 base pairs fragment obtained from non-transgenic brinjal plant due to amplification of non- transgenic allele band from SEQ ID NO: 13 and SEQ ID NO: 17.
  • the sequence of the MHTBJ-8 primer is provided below.

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Abstract

L'invention concerne un événement de transformation EE-6726 de l'aubergine, ainsi que des plantes, des cellules végétales, des graines et des parties de plante comprenant un événement EE-6726 conférant une résistance aux dommages causés par les insectes lépidoptères. L'invention concerne également des séquences d'acides nucléiques spécifiques de l'événement EE-6726 et des plantes, des cellules végétales, des graines et des parties de plantes comprenant des acides nucléiques spécifiques de l'événement EE-6726. La présente invention concerne également des procédés de détection de la présence de l'événement EE-6726 sur la base de la séquence d'ADN de la construction recombinante insérée dans le génome de l'aubergine à l'origine de l'événement EE-6726 et/ou des séquences génomiques flanquant le site d'insertion.
PCT/IN2020/051075 2020-01-02 2020-12-31 Événement de transformation ee-6726 de l'aubergine (solanum melongena), kit et procédé de détection d'événement ee-6726 WO2021137255A1 (fr)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002100163A2 (fr) * 2001-06-11 2002-12-19 Monsanto Technology Llc Evenement mon15985 du coton et compositions et procedes servant a sa detection
WO2007091277A2 (fr) * 2006-02-10 2007-08-16 Maharashtra Hybrid Seeds Company Limited (Mahyco) Aubergine transgenique (solanum melongena) comprenant un evenement ee-i

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002100163A2 (fr) * 2001-06-11 2002-12-19 Monsanto Technology Llc Evenement mon15985 du coton et compositions et procedes servant a sa detection
WO2007091277A2 (fr) * 2006-02-10 2007-08-16 Maharashtra Hybrid Seeds Company Limited (Mahyco) Aubergine transgenique (solanum melongena) comprenant un evenement ee-i
EP1989313A2 (fr) * 2006-02-10 2008-11-12 Maharashtra Hybrid Seeds Company Limited (MAHYCO) Aubergine (solanum melongena) transgenique exprimant le gene cryiac

Non-Patent Citations (4)

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Title
KALIA VINAY ET AL: "Susceptibility of Brinjal Shoot and Fruit Borer, Leucinodes orbonalis (Guenée) to Bacillus thuringiensis and its Cry Toxins", 1 January 2013 (2013-01-01), XP055811443, Retrieved from the Internet <URL:https://www.researchgate.net/publication/279866900_Susceptibility_of_Brinjal_Shoot_and_Fruit_Borer_Leucinodes_orbonalis_Guenee_to_Bacillus_thuringiensis_and_its_Cry_Toxins> [retrieved on 20210608] *
KUMAR POLUMETLA A ET AL: "Insect-resistant transgenic brinjal plants", MOLECULAR BREEDING: NEW STRATEGIES IN PLANT IMPROVEMENT, KLUWER ACADEMIC PUBLISHERS, NL, vol. 4, no. 1, 1 February 1998 (1998-02-01), pages 33 - 37, XP002440922, ISSN: 1380-3743, DOI: 10.1023/A:1009694016179 *
PAL J. K. ET AL: "Development and bioassay of Cry1Ac- transgenic eggplant ( Solanum melongena L.) resistant to shoot and fruit borer", JOURNAL OF HORTICULTURAL SCIENCE AND BIOTECHNOLOGY, vol. 84, no. 4, 1 January 2009 (2009-01-01), GB, pages 434 - 438, XP055811459, ISSN: 1462-0316, DOI: 10.1080/14620316.2009.11512545 *
RAI NEHA PRAKASH ET AL: "Shoot and fruit borer resistant transgenic eggplant (Solanum melongenaL.) expressingcry1Aa3gene: Development and bioassay", CROP PROTECTION, ELSEVIER SCIENCE, GB, vol. 53, 9 July 2013 (2013-07-09), pages 37 - 45, XP028728568, ISSN: 0261-2194, DOI: 10.1016/J.CROPRO.2013.06.005 *

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