Targeted mutagenesis in the progeny of maize transgenic plants

Journal Article / 2009

Yang, Meizhu; Djukanovic, Vesna; Stagg, Jessica; Lenderts, Brian; Bidney, Dennis; Falco, S. Carl; Lyznik, L. Alexander

We have demonstrated that targeted mutagenesis can be accomplished in maize plants by excision, activation, and subsequent elimination of an endonuclease in the progeny of genetic crosses. The yeast FLP/FRT site-specific recombination system was used to excise and transiently activate the previously integrated yeast I-SceI homing endonuclease in maize zygotes and/or developing embryos. An artificial I-SceI recognition sequence integrated into genomic DNA was analyzed for mutations to indicate the I-SceI endonuclease activity. Targeted mutagenesis of the I-SceI site occurred in about 1% of analyzed F1 plants. Short deletions centered on the I-SceI-produced double-strand break were the predominant genetic lesions observed in the F1 plants. The I-SceI expression cassette was not detected in the mutant F1 plants and their progeny. However, the original mutations were faithfully transmitted to the next generation indicating that the mutations occurred early during the F1 plant development. The procedure offers simultaneous production of double-strand breaks and delivery of DNA template combined with a large number of progeny plants for future gene targeting experiments.

Base Sequence; Crosses, Genetic; Deoxyribonucleases, Type II Site-Specific/genetics/metabolism; DNA Breaks, Double-Stranded; DNA Probes/genetics; DNA, Bacterial/genetics; DNA, Plant/genetics; DNA, Recombinant/genetics; gene expression; gene targeting; Genes, Fungal; Genetic Vectors; Molecular Sequence Data; mutagenesis; Plants, Genetically Modified; polymerase chain reaction; Saccharomyces cerevisiae Proteins/genetics/metabolism; Saccharomyces cerevisiae/enzymology/genetics; Zea mays/embryology/genetics/metabolism

Plant molecular biology

6

669–679

70

10.1007/s11103-009-9499-5

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