Figure 7. WRN RQC mutants are not able to stimulate NEIL1 incision activity. (A) NEIL1 incision activity in the presence of WRN mutants. 1 nM of NEIL1 was incubated with 0, 1, 2 or 4 nM of WRN wild type (lane 3 to 5) or WRN variants (lane 6 to 8, R993A; lane 9 to 11, F1037A; lane 12 to 14, R993A/F1037A) in the presence of 0.5 nM of DNA substrate at 37 °C for 10 min. Reaction products were separated on 10 % denaturing polyacrylamide gel. (B) Quantitative analysis of (A). Experiments were repeated at least three times, error bars represent ± SD.