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Data · dataset · 2018

Kinetics and fidelity of the repair of Cas9-induced double-strand DNA breaks. Brinkman, E.K. et al

Listed in Teesside University Research Data Repository

Figure 1: We established a clonal K562 cell line with a stably integrated construct that encodes a tightly controlled inducible Cas9 nuclease.

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Western blot analysis of Cas9 at various time points after induction of Cas9 by Shield-1. It shows that Cas9 accumulates gradually after induction.

Figure 3, 5, S3, S6: We established a variant of the ligation-mediated PCR assay for the quantification of DNA breaks at a defined location (Chailleux et al., 2014; Dai et al., 2000; Garrity and Wold, 1992). For the detection of broken DNA, we first denature the DNA and subject it to a primer extension reaction using a primer near the break site. This ensures that all cleavage sites are converted into blunt ends, even if resection of the broken ends has occurred.

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Next, an adaptor is ligated to the blunted DNA end, followed by PCR with one primer near the break site and a second primer that is complementary to the adaptor sequence. When analyzed on agarose gels, the samples from cells treated with sgRNA and Shield-1 yielded a band of the expected size. Figure 6: in vitro digestion by CRISPR.

By PCR we first produced double-stranded DNA fragments of 600 – 1,000 bp of 3 loci in the genome. We then incubated each fragment in vitro with the respective Cas9/sgRNA complex to induce DSBs, and investigated the reaction products by agarose electrophoresis. Some samples Cas9 was subsequently denatured by two different heat treatment protocols (20 min 80 ˚C or 5 min 96 ˚C).

DNA was incubated for either 2 hours or overnight.

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