Identification and/or quantification method of nucleotide sequence (s) elements specific of genetically modified plants on arrays

• US 20070117106A1
• Filed: 05/16/2006
• Published: 05/24/2007
• Est. Priority Date: 05/17/2005
• Status: Abandoned Application

• Current Assignee: Eppendorf Array Technologies SA (Eppendorf Se)
• Original Assignee: Eppendorf Array Technologies SA (Eppendorf Se)
• Inventors: Remacle, Jose, Hamels, Sandrine
• Application Number:
  US11/435,553
• Publication Number:
  US 20070117106A1
• Time in Patent Office: Days
• US Class Current: 435/6
• CPC Class Codes: C12Q 1/6895 for plants, fungi or algae
• CPC Class Codes: C12Q 2600/16 Primer sets for multiplex assays

Abstract

The present invention is related to an identification and/or quantification method of several organisms among many other ones possibly present in the analyzed sample having homologous sequence(s) by the determination of the genetic map of the organism. The method combines a limited number of amplifications of target sequence(s) using common primer pairs and the recording upon an array for the presence of single signals resulting from the binding between the capture sequence(s) and their corresponding target sequence(s) and correlating the presence of said detected target sequence(s) to the identification of some genetic specific sequence(s) of said (micro)organism(s) referred as genetic elements and from there to the identification of the organism. The method and device according to the invention allow the easy identification/detection of a sequence specific of an organism among other homologous sequence(s) and possibly its quantification. The identification of the various targets from the initial organism if obtained after their binding on specific capture probes present on a support or substrate preferably in the form of an array. The identification of the amplified targets is obtained directly, after washing of possible contaminants (unbound sequence(s)), by detecting and possibly recording for one target, a single spot signal at one specific location, wherein said capture nucleotide sequence was previously bound and said identification of a target is not a result of a complex pattern of spots upon the microarray to be analyzed in order to identify one target as proposed in the system of the state of the art.

Claims

1. A method for identifying a genetically modified plant by an identification and/or quantification of different and multiple nucleotide sequence elements corresponding to at least a portion of an exogenous nucleotide sequence integrated into the genome of the genetically modified plant, wherein said elements are present in a biological sample and wherein the method comprises the steps of:

a) amplifying or copying a nucleotide sequence element or part of it into target nucleotide sequences, using primer pairs which are able to amplify the said nucleotide sequence element being homologous with nucleotide sequence elements present in at least two different genetically modified plants wherein said nucleotide sequence element is selected from the group consisting of the following promoters, terminators and/or markers sequence(s);

P35s, T-nos, nptII, pat, Cry1Ab and EPSPS, and wherein the length of the target nucleotide sequence is comprised between about 100 and about 200 bases;

b) putting into contact the obtained target nucleotide sequences with single stranded capture nucleotide sequences bound by a covalent link to the insoluble solid support at a specific location of the solid support surface;

c) detecting the binding of the target nucleotide sequences, by detecting a signal resulting from hybridization by complementary base pairing of the target nucleotide sequence and its corresponding capture nucleotide sequence at the specific location, wherein the capture nucleotide sequence(s) are bound to the insoluble solid support at a specific location according to an array, having a density of at least 4 different bound single stranded capture nucleotide sequence(s)/cm² of solid support surface and wherein the capture nucleotide sequence comprises a sequence having between 10 and 200 bases, which allows a specific hybridization with the target nucleotide sequence to be detected and/or quantified;

d) repeating the steps a) to c) for a second, third, fourth or more different nucleotide sequence elements specific of the genetically modified plant, and

e) constructing a genetic map based on the presence or absence of these different and multiple nucleotide sequence elements; and

f) identifying the genetically modified plant in the biological sample based upon the constructed genetic map.

2. The method according to claim 1, wherein the nucleotide sequence(s) elements have a length comprised between about 100 and about 800 nucleotides and correspond to at least a portion of exogenous nucleotide sequence(s) integrated into the genome of the genetically modified plant.

3. The method according to claim 1, wherein the capture nucleotide sequence able to hybridise with its corresponding target nucleotide sequence is separated from the surface of the solid support by a spacer having a length of at least 6.8 nm.

4. The method according to claim 1, wherein the capture nucleotide sequence comprises a sequence having between 10 and 49 bases, which allows a specific hybridization with the target nucleotide sequence to be detected and/or quantified.

5. The method according to claim 1, wherein the exogenous nucleotide sequence integrated into the genome of the plant is selected from the group consisting of antibiotic resistant genes, regulatory sequence(s), repeated sequences and/or genes coding for specific enzymatic activities.

6. The method according to claim 1, wherein the genetically modified plants are selected from the group consisting of the following varieties :

BT11, BT176, Ga21, Mon 810, RRS, T25, T45, Topas19/2, Starlink,NK603,GT73, Liberator L62, Falcon GS 40/90, MS1-RF1, MS1-RF2, MS8-RF3, 1445, 531, Mon 863, Mon810xMON863, TC1507, and Maisgard/RR.

7. The method according to claim 1, wherein the nucleotide sequence(s) elements are amplified into target nucleotide sequence(s) by using consensus primers.

8. The method according to claim 1, wherein the nucleotide sequence(s) elements are mRNA sequence(s) which are reverse transcribed into cDNA, with the same primer pair.

9. The method according to claim 1, wherein the target nucleotide sequence(s) corresponding to nucleotide sequence(s) elements specific of different genetically modified plants, are detected on the same capture nucleotide sequence(s).

10. The method according to claim 1, wherein the target nucleotide sequence(s) corresponding to nucleotide sequence(s) elements specific of different genetically modified plants, are detected on different capture nucleotide sequence(s).

11. The method according to claim 1, wherein the step a) of amplifying and/or copying the different nucleotide sequence(s) elements, specific of different genetically modified plants, are performed at the same time.

12. The method according to claim 1, wherein the different steps b) and c) of detecting and/or quantifying the target nucleotide sequence(s) corresponding to nucleotide sequence(s) elements specific of different genetically modified plants, are performed at the same time.

13. The identification method according to claim 1, wherein the spacer is a nucleotide sequence comprised between about 20 and about 150 bases.

14. The method according to claim 1, wherein the density of the capture nucleotides sequence(s) bound to the surface of the solid support, at specific location, is superior to 10 fmoles per cm² of the solid support surface.

15. The quantification method according to claim 1, wherein the amplification of nucleotide sequence(s) elements into target nucleotide sequence(s) are performed by PCR amplification, by first tailed primers and second primers identical or complementary to the tail(s).

16. The quantification method according to claim 15, wherein the tailed primers are first destroyed before the amplification with the second tail primer(s).

17. The quantification method according to claim 15, wherein the first tailed primers and the second tail primer(s) are both present from the first amplification step, with the tailed primers being at least in a concentration 5 times lower than the tail primer(s).

18. The quantification method according to claim 15, which further comprises an amplification step of other nucleotide sequence(s) than nucleotide sequence(s) elements and with primers pairs different than the ones used in the amplification and/or copying step of the nucleotide sequence(s) elements.

19. The quantification method according to claim 17, wherein the other nucleotide sequences submitted to another amplification step are nucleotide sequences specific of plant species, plant genus, or plant family detection.

20. The quantification method according to claim 15, wherein the quantification of the nucleotide sequence element specific of a genetically modified plant is compared to the quantification of a gene or sequence of the non transformed part of the plant.

21. The quantification method according to claim 15, wherein the quantification of the nucleotide sequence element specific of a genetically modified plant is compared to the quantification of a standard sequence incorporated into the assay method at a known copy number.

22. The method according to claim 1, wherein the insoluble solid support is selected from the group consisting of glasses, electronic devices, silicon supports, plastic supports, compact discs, filters, gel layers, metallic supports and a mixture thereof.

23. The method according to claim 1, wherein the nucleotide sequence(s) elements are RNA sequence(s) submitted to a reverse transcription of the 3′

or 5′

end by using consensus primer and possibly a stopper sequence.

24. The method according to claim 23, wherein the nucleotide sequence(s) elements are RNA sequence(s) submitted to a reverse transcription of the 3′

or 5′

end by using consensus primer and a stopper sequence.

25. The method according to claim 1, wherein the solid support bears capture nucleotide sequence(s) for the binding with the homologous target nucleotide sequence together with a consensus sequence for a common detection of all homologous or identical target sequence(s) corresponding to the same nucleotide sequence(s) elements present in the different genetically modified plants.

26. The method according to claim 1, wherein the method also includes the amplification of at least one standard which signal is used for quantification of the amount of a different and multiple nucleotide sequence element in the sample.

27. The method according to claim 1, wherein the method also includes the amplification of at least one standard which signal is used for quantification of the number of copies of the amount of a different and multiple nucleotide sequence element in the sample.

28. The method according to claim 1, wherein the quantification of the amount of a specific amount of a different and multiple nucleotide sequence element in the sample from a same family or a same species, in the sample is performed by comparing an amount of a specific element of the plant to the amount of an element present in all members of the same family, or a same specie.

29. The method according to claim 1, wherein the nucleotide sequence(s) elements have a length comprised between about 100 and about 200 nucleotides.

30. The method according to claim 1, which further comprises the step of labelling the target nucleotide sequences.

31. A diagnostic and/or quantification kit which comprises means and media for performing the method according to claim 1, an insoluble solid support upon which single stranded capture nucleotide sequences are bound, said single stranded capture nucleotide sequences containing sequences of between about 10 and about 200 bases specific for at least four of P35s, T-nos, nptII, pat, Cry1Ab and EPSPS nucleotide sequences elements to be detected and/or quantified and having a total length comprised between about 30 and about 600 bases, said single stranded capture nucleotide sequence(s) being disposed upon the surface of the solid support according to an array with a density of at least 4 single stranded capture nucleotide sequence(s)/cm² of the solid support surface.

32. The diagnostic kit according to claim 31, wherein the capture nucleotide sequence(s) contain the following sequences specific for the nucleotide sequence elements P35s, T-nos, nptII, pat, Cry1Ab and EPSPS to be detected and/or quantified:

33. The diagnostic kit according to claim 31 including a means in the form of a computer program for the analysis of the experimental results obtained on the detection and/or identification of different genetic elements and the identification of an organism.

34. The diagnostic kit according to claim 31 including a data bank with the composition of the genetic elements of the possible detectable organisms.