Journal
NATURE BIOTECHNOLOGY
Volume 36, Issue 7, Pages 632-+Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/nbt.4166
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Funding
- CIHR [FDN-143334]
- Ontario Genomics [OGI-099]
- Genome Canada
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Rapid, efficient generation of knock-in mice with targeted large insertions remains a major hurdle in mouse genetics. Here, we describe two-cell homologous recombination (2C-HR)-CRISPR, a highly efficient gene-editing method based on introducing CRISPR reagents into embryos at the two-cell stage, which takes advantage of the open chromatin structure and the likely increase in homologous-recombination efficiency during the long G2 phase. Combining 2C-HR-CRISPR with a modified biotin-streptavidin approach to localize repair templates to target sites, we achieved a more-than-tenfold increase (up to 95%) in knock-in efficiency over standard methods. We targeted 20 endogenous genes expressed in blastocysts with fluorescent reporters and generated reporter mouse lines. We also generated triple-color blastocysts with all three lineages differentially labeled, as well as embryos carrying the two-component auxin-inducible degradation system for probing protein function. We suggest that 2C-HR-CRISPR is superior to random transgenesis or standard genome-editing protocols, because it ensures highly efficient insertions at endogenous loci and defined 'safe harbor' sites.
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