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Scoop.it!
A gain-of-function mutation in a sodium/potassium pump renders cells resistant to a small-molecule drug and provides an efficient coselection strategy to enrich for CRISPR-induced mutations at an independent locus. 
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Scoop.it!
BigField GEG Tech's insight:
The authors targeted DNA ligase IV, a key enzyme in the NHEJ pathway, using the inhibitor Scr7 to promote HDR at the expense of NHEJ. Scr7 treatment increased the efficiency of HDR-mediated genome editing, using Cas9 in mammalian cell lines and in mice for all four genes examined, up to 19-fold.
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Here, the scientists designed a simple and robust coselection strategy for enrichment of cells with either nuclease-driven nonhomologous end joining (NHEJ) or homology-directed repair (HDR) events by harnessing the multiplexing capabilities of CRISPR-Cas9 and Cpf1 systems.