Improved genome editing in human cell lines using the CRISPR method

Ivan M. Munoz, Piotr Szyniarowski, Rachel Toth, John Rouse (Lead / Corresponding author), Christophe Lachaud (Lead / Corresponding author)

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    The Cas9/CRISPR system has become a popular choice for genome editing. In this system, binding of a single guide (sg) RNA to a cognate genomic sequence enables the Cas9 nuclease to induce a double-strand break at that locus. This break is next repaired by an error-prone mechanism, leading to mutation and gene disruption. In this study we describe a range of refinements of the method, including stable cell lines expressing Cas9, and a PCR based protocol for the generation of the sgRNA. We also describe a simple methodology that allows both elimination of Cas9 from cells after gene disruption and re-introduction of the disrupted gene. This advance enables easy assessment of the off target effects associated with gene disruption, as well as phenotype-based structure-function analysis. In our study, we used the Fan1 DNA repair gene as control in these experiments. Cas9/CRISPR-mediated Fan1 disruption occurred at frequencies of around 29%, and resulted in the anticipated spectrum of genotoxin hypersensitivity, which was rescued by re-introduction of Fan1.
    Original languageEnglish
    Article numbere109752
    Number of pages6
    JournalPLoS ONE
    Issue number10
    Publication statusPublished - 10 Oct 2014


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