Inducible site-specific recombination for the activation and...

C - Chemistry – Metallurgy – 12 – N

Patent

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C12N 15/82 (2006.01) A01H 5/00 (2006.01)

Patent

CA 2391312

Disclosed is an inducible promoter system in conjunction with a site-specific recombination system which allows (i) specific activation of transgenes at specific times or (ii) excision and removal of transgenes (e.g., antibiotic resistance markers) from transgenic plants. These "suicide" gene cassettes, including the recombination system itself, can be evicted from the plant genome once their function has been exerted. The system is based on the ability to temporally and spatially induce the expression of CRE recombinase which then binds to directly repeated lox sites flanking the transgene in question leading to the precise excision of the gene cassette. Also disclosed is a method to activate an inverted, and therefore silent, transgene by placing two lox sites in opposite orientations flanking the transgene. This results in inversion of the intervening DNA fragment in the presence of CRE recombinase. This activation can be timed by placing the CRE recombinase under the control of an inducible promoter.

L'invention concerne un système de promoteur inductible en conjonction avec un système de recombinaison dirigée permettant (i) une activation spécifique de transgènes à des moments spécifiques ou (ii) une excision et une élimination de transgènes (par exemple, des marqueurs de résistance antibiotique) de plantes transgéniques. Ces cassettes de gène "suicide", incluant le système de recombinaison lui-même, peuvent être évincées du génome de la plante une fois leur fonction remplie. Le système est basé sur la possibilité temporelle et spatiale d'induire l'expression de recombinase CRE qui se lie alors directement à des sites lox situés de part et d'autre du transgène en question, ce qui mène à une excision précise de la cassette de gène. L'invention concerne aussi un procédé destiné à activer un transgène inversé, et donc inactif, par placement de deux sites lox en orientations opposées de part et d'autre du transgène. Ceci permet l'inversion du fragment d'ADN intercalaire en présence de la recombinase CRE. Il est possible de minuter cette activation en plaçant la recombinase CRE sous la dépendance d'un promoteur inductible.

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