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Genome engineering using the CRISPR-Cas9 system.

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      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.

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      [1 ] 1] Broad Institute of Massachusetts Institute of Technology (MIT) and Harvard, Cambridge, Massachusetts, USA. [2] McGovern Institute for Brain Research, Cambridge, Massachusetts, USA. [3] Department of Brain and Cognitive Sciences, MIT, Cambridge, Massachusetts, USA. [4] Department of Biological Engineering, MIT, Cambridge, Massachusetts, USA. [5] Department of Molecular and Cellular Biology, Harvard University, Cambridge, Massachusetts, USA. [6].
      Nat Protoc
      Nature protocols
      Springer Nature
      Nov 2013
      : 8
      : 11
      24157548 nprot.2013.143 10.1038/nprot.2013.143 3969860 NIHMS539734


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