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Wefers, B. ; Wurst, W. ; Kühn, R.*

Gene editing in mouse zygotes using the CRISPR/Cas9 system.

Methods Mol. Biol. 2631, 207-230 (2023)

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Engineering of the mouse germline is a key technology in biomedical research for studying the function of genes in health and disease. Since the first knockout mouse was described in 1989, gene targeting was based on recombination of vector encoded sequences in mouse embryonic stem cell lines and their introduction into preimplantation embryos to obtain germline chimeric mice. This approach has been replaced in 2013 by the application of the RNA-guided CRISPR/Cas9 nuclease system, which is introduced into zygotes and directly creates targeted modifications in the mouse genome. Upon the introduction of Cas9 nuclease and guide RNAs into one-cell embryos, sequence-specific double-strand breaks are created that are highly recombinogenic and processed by DNA repair enzymes. Gene editing commonly refers to the diversity of DSB repair products that include imprecise deletions or precise sequence modifications copied from repair template molecules. Since gene editing can now be easily applied directly in mouse zygotes, it has rapidly become the standard procedure for generating genetically engineered mice. This article covers the design of guide RNAs, knockout and knockin alleles, options for donor delivery, preparation of reagents, microinjection or electroporation of zygotes, and the genotyping of pups derived from gene editing projects.

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