Werner syndrome is genetically linked to mutations in WRN that encodes a DNA helicase-nuclease believed to
operate at stalled replication forks. Using a newly identified small-molecule inhibitor of WRN helicase (NSC
617145), we investigated the role ofWRNin the interstrand cross-link (ICL) response in cells derived from patients
with Fanconi anemia, a hereditary disorder characterized by bone marrow failure and cancer. In