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Scarless Cas9 Assisted Recombineering (no‐SCAR) in Escherichia coli, an Easy‐to‐Use System for Genome Editing

Author(s)
Reisch, Christopher R; Jones, Kristala L.
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Abstract
The discovery and development of genome editing systems that leverage the site‐specific DNA endonuclease system CRISPR/Cas9 has fundamentally changed the ease and speed of genome editing in many organisms. In eukaryotes, the CRISPR/Cas9 system utilizes a “guide” RNA to enable the Cas9 nuclease to make a double‐strand break at a particular genome locus, which is repaired by non‐homologous end joining (NHEJ) repair enzymes, often generating random mutations in the process. A specific alteration of the target genome can also be generated by supplying a DNA template in vivo with a desired mutation, which is incorporated by homology‐directed repair. However, E. coli lacks robust systems for double‐strand break repair. Thus, in contrast to eukaryotes, targeting E. coli chromosomal DNA with Cas9 causes cell death. However, Cas9‐mediated killing of bacteria can be exploited to select against cells with a specified genotype within a mixed population. In combination with the well described λ‐Red system for recombination in E. coli, we created a highly efficient system for marker‐free and scarless genome editing.
Date issued
2018-02
URI
http://hdl.handle.net/1721.1/115128
Department
Massachusetts Institute of Technology. Department of Chemical Engineering
Journal
Current Protocols in Molecular Biology
Publisher
Wiley Blackwell
Citation
Reisch, Christopher R. and Kristala L.J. Prather. “Scarless Cas9 Assisted Recombineering (no‐SCAR) in Escherichia coli, an Easy‐to‐Use System for Genome Editing.” Current Protocols in Molecular Biology (January 2017): 31.8.1–31.8.20 © 2017 John Wiley & Sons, Inc
Version: Author's final manuscript

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