Fig. 4From: Ligase IV inhibitor SCR7 enhances gene editing directed by CRISPR–Cas9 and ssODN in human cancer cellsDetermination of insertion repair efficiency and NHEJ rate at AAVS1 locus by restriction fragment length polymorphism assay, TA cloning and DNA sequencing. a and b show the enhancement of insertion repair by ssODN and SCR7 treatment in MCF-7 and HCT-116 cells as determined by restriction fragment length polymorphism assay. Genomic DNA was amplified by PCR, digested with EcoRI, and resolved in a 10% acrylamide gel. The original and cleaved DNA fragments are marked by arrows; the signals were quantified by densitometry; and the percentages of the cleaved fragments were calculated as described in “Methods”. c and d show the quantitation of insertion repair efficiency (%HDR), and Panels e and f show the percentages of NHEJ at AAVS1 locus by DNA sequencing of TA clones in MCF-7 and HCT-116 cells, respectively. Approximately 100 TA-clones were randomly picked up for DNA sequencing, and the insertion repair efficiency (%HDR) and NHEJ rate (%) in MCF-7 and HCT-116 cells was calculated based on DNA sequencing as described in the Methods. The data are the mean ± SD of three independent experiments. *p < 0.05, **p < 0.01 compared to the corresponding group without SCR7 (t test)Back to article page