SF3B1 hotspot mutations confer sensitivity to PARP inhibition by eliciting a defective replication stress response.

ABSTRACT: SF3B1 hotspot mutations are associated with a poor prognosis in several tumor types and lead to global disruption of canonical splicing. Through synthetic lethal drug screens, we identify that SF3B1 mutant (SF3B1^MUT) cells are selectively sensitive to poly (ADP-ribose) polymerase inhibitors (PARPi), independent of hotspot mutation and tumor site. SF3B1^MUT cells display a defective response to PARPi-induced replication stress that occurs via downregulation of the cyclin-dependent kinase 2 interacting protein (CINP), leading to increased replication fork origin firing and loss of phosphorylated CHK1 (pCHK1; S317) induction. This results in subsequent failure to resolve DNA replication intermediates and G₂/M cell cycle arrest. These defects are rescued through

SUBMITTER: Bland P 

PROVIDER: S-EPMC10412459 | biostudies-literature | 2023 Aug

REPOSITORIES: biostudies-literature