Protocol

Chromosomal Mutagenesis

Volume 1239 of the series Methods in Molecular Biology pp 197-217

Date:

Genome Engineering Using CRISPR-Cas9 System

  • Le CongAffiliated withBroad Institute of MIT and HarvardMcGovern Institute for Brain Research, Department of Brain and Cognitive Sciences, Department of Biological Engineering, Massachusetts Institute of Technology Email author 
  • , Feng ZhangAffiliated withBroad Institute of MIT and HarvardMcGovern Institute for Brain Research, Department of Brain and Cognitive Sciences, Department of Biological Engineering, Massachusetts Institute of Technology

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Abstract

The Clustered Regularly Interspaced Short Palindromic Repeats (CRISPR)-Cas9 system is an adaptive immune system that exists in a variety of microbes. It could be engineered to function in eukaryotic cells as a fast, low-cost, efficient, and scalable tool for manipulating genomic sequences. In this chapter, detailed protocols are described for harnessing the CRISPR-Cas9 system from Streptococcus pyogenes to enable RNA-guided genome engineering applications in mammalian cells. We present all relevant methods including the initial site selection, molecular cloning, delivery of guide RNAs (gRNAs) and Cas9 into mammalian cells, verification of target cleavage, and assays for detecting genomic modification including indels and homologous recombination. These tools provide researchers with new instruments that accelerate both forward and reverse genetics efforts.

Key words

Genome engineering Cas9 CRISPR CRISPR-Cas9 PAM Guide RNA sgRNA DNA cleavage Mutagenesis Homologous recombination Streptococcus pyogenes