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Efficient scar-free knock-ins of several kilobases in plants by engineered CRISPR/Cas endonucleases.
Molecular Plant 2024 March 23
In plants and mammals, non-homologous end-joining is the dominant pathway to repair DNA double strand breaks, making it challenging to generate knock-in events. We identified two groups of exonucleases from the Herpes Virus and the bacteriophage T7 families that conferred an up to 38-fold increase in HDR frequencies when fused to Cas9/Cas12a in a Tobacco mosaic virus-based transient assay in Nicotiana benthamiana. We achieved precise and scar-free insertion of several kilobases of DNA both in transient and stable transformation systems. In Arabidopsis thaliana, fusion of Cas9 to a Herpes Virus family exonuclease leads to 10-fold higher frequencies of knock-ins in the first generation of transformants. In addition, we demonstrate stable and heritable knock-ins of in wheat in 1% of the primary transformants. Our results open perspectives for the routine production of heritable knock-in and gene replacement events in plants.
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