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Genome engineering using the CRISPR-Cas9 system

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.

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Figure 1: Schematic of the RNA-guided Cas9 nuclease.
Figure 2: DSB repair promotes gene editing.
Figure 3: Timeline and overview of experiments.
Figure 4: Target selection and reagent preparation.
Figure 5: Anticipated results for multiplex-sgRNA-targeted NHEJ.
Figure 6: Anticipated results for HDR in HEK and HUES9 cells.

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Acknowledgements

We thank B. Holmes for help with computational tools. P.D.H. is a James Mills Pierce Fellow and D.A.S. is a National Science Foundation (NSF) pre-doctoral fellow. V.A. is supported by NIH Training Grants T32GM007753 and T32GM008313. This work was supported by an NIH Director's Pioneer Award (1DP1-MH100706); an NIH Transformative R01 grant (1R01-DK097768); the Keck, McKnight, Damon Runyon, Searle Scholars, Vallee, Merkin, Klingenstein and Simons Foundations; Bob Metcalfe; and Jane Pauley. Reagents are available to the academic community through Addgene and associated protocols; support forums and computational tools are available via the Zhang lab website (http://www.genome-engineering.org/).

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F.A.R., P.D.H., J.W., D.A.S. and F.Z. designed and performed the experiments. V.A. contributed to the online tool. F.A.R., P.D.H. and F.Z. wrote the manuscript with help from all authors.

Corresponding author

Correspondence to Feng Zhang.

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A patent application has been filed relating to this work.

Supplementary information

Supplementary Data 1

Supplementary sequences (PDF 97 kb)

Supplementary Data 2

pSpCas9(BB) plasmid sequence (TXT 12 kb)

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Ran, F., Hsu, P., Wright, J. et al. Genome engineering using the CRISPR-Cas9 system. Nat Protoc 8, 2281–2308 (2013). https://doi.org/10.1038/nprot.2013.143

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