Figure 3.
Selective oncogene disruption using Ad/sgEGFR and Ad/Cas9 in vivo. Indels at the wild-type (gray bar) and mutant EGFR alleles (blue bar) in (A) H1975 or (B) A549 tumor xenografts co-injected with Ad/sgEGFR and Ad/Cas9 at day 7, 9, 11 and 31 after the first injection. Tumor-bearing mice were given intratumoral injections of PBS (mock) or 5 × 1010 Ad VPs (Ad/Cas9 + Ad/empty vector or Ad/sgEGFR + Ad/Cas9) on days 1, 3 and 5. Values represent the mean ± S.E.M. (n= 3 to 4). **P < 0.01. ns: not significant. (C) No off-target indels were detectably induced at eight homologous sites that differed from the on-target sites by up to 3 nt in the human genome. Mismatched nucleotides are shown in blue and PAM sequences in red, On; on-target site, OT; off-target site. Red arrow indicates cleavage position within the 19-bp target sequences. Error bar indicates S.E.M. (n = 3 to 4).