The cytotoxic effects of topoisomerase I inhibitors such as camptothecin can be modulated by replication fork reversal, in a process that requires Poly(ADP-ribose) polymerase (PARP) activity. Here human RECQ1 helicase is shown to restore such regressed replication forks, whereas PARP1 activity restrains this RECQ1 function.
- Matteo Berti
- Arnab Ray Chaudhuri
- Alessandro Vindigni