PT  - JOURNAL ARTICLE
AU  - Miura, Hiromi
AU  - Quadros, Rolen M.
AU  - Gurumurthy, Channabasavaiah B.
AU  - Ohtsuka, Masato
TI  - An Efficient CRISPR protocol for generating Conditional and Knock-in mice using long single-stranded DNA donors
AID  - 10.1101/141424
DP  - 2017 Jan 01
TA  - bioRxiv
PG  - 141424
4099  - http://biorxiv.org/content/early/2017/05/23/141424.short
4100  - http://biorxiv.org/content/early/2017/05/23/141424.full
AB  - The CRISPR/Cas9 tool can easily generate knockout mouse models by disrupting the gene sequence, but its efficiency for creating models that require either insertion of exogenous DNA (knock-in) or replacement of genomic segments is very poor. The majority of mouse models used in research are knock-in (reporters or recombinases) or gene-replacement (for example, conditional knockout alleles containing LoxP sites flanked exons). A few methods for creating such models are reported using double-stranded DNA as donors, but their efficiency is typically 1–10% and therefore not suitable for routine use. We recently demonstrated that long single-stranded DNAs serve as very efficient donors, both for insertion and for gene replacement. We call this method Easi-CRISPR (efficient additions with ssDNA inserts-CRISPR), a highly efficient technology (typically 25%-50%, and up to 100% in some cases), one that has worked at over a dozen loci thus far. Here, we provide detailed protocols for Easi-CRISPR.