Oct 26, 2013

Genome engineering using the CRISPR-Cas9 system

Nature Protocols
F Ann RanFeng Zhang

Abstract

Targeted nucleases are powerful tools for mediating genome alteration with high precision. The RNA-guided Cas9 nuclease from the microbial clustered regularly interspaced short palindromic repeats (CRISPR) adaptive immune system can be used to facilitate efficient genome engineering in eukaryotic cells by simply specifying a 20-nt targeting sequence within its guide RNA. Here we describe a set of tools for Cas9-mediated genome editing via nonhomologous end joining (NHEJ) or homology-directed repair (HDR) in mammalian cells, as well as generation of modified cell lines for downstream functional studies. To minimize off-target cleavage, we further describe a double-nicking strategy using the Cas9 nickase mutant with paired guide RNAs. This protocol provides experimentally derived guidelines for the selection of target sites, evaluation of cleavage efficiency and analysis of off-target activity. Beginning with target design, gene modifications can be achieved within as little as 1-2 weeks, and modified clonal cell lines can be derived within 2-3 weeks.

Mentioned in this Paper

Non-Homologous DNA End-Joining
Immune System
Transfection
HEK293 Cells
Genome
Graft-vs-Host Disease
Base Excision Repair
Cell Culture Techniques
Cytokinesis of the Fertilized Ovum
Alkaline DNase

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