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Veillet, Florian; Perrot, Laura; Chauvin, Laura; Kermarrec, Marie-Paule; Guyon-Debast, Anouchka; Chauvin, Jean-Eric; Nogué, Fabien; Mazier, Marianne
International journal of molecular sciences, 01/2019, Volume: 20, Issue: 2Journal Article
Genome editing tools have rapidly been adopted by plant scientists for gene function discovery and crop improvement. The current technical challenge is to efficiently induce precise and predictable targeted point mutations valuable for crop breeding purposes. Cytidine base editors (CBEs) are CRISPR/Cas9 derived tools recently developed to direct a C-to-T base conversion. Stable genomic integration of CRISPR/Cas9 components through -mediated transformation is the most widely used approach in dicotyledonous plants. However, elimination of foreign DNA may be difficult to achieve, especially in vegetatively propagated plants. In this study, we targeted the ( ) gene in tomato and potato by a CBE using -mediated transformation. We successfully and efficiently edited the targeted cytidine bases, leading to chlorsulfuron-resistant plants with precise base edition efficiency up to 71% in tomato. More importantly, we produced 12.9% and 10% edited but transgene-free plants in the first generation in tomato and potato, respectively. Such an approach is expected to decrease deleterious effects due to the random integration of transgene(s) into the host genome. Our successful approach opens up new perspectives for genome engineering by the co-edition of the with other gene(s), leading to transgene-free plants harboring new traits of interest.
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