Stochastic variation in the FOXM1 transcription program mediates replication stress tolerance.

ABSTRACT: Oncogene-induced replication stress (RS) is a vulnerability of cancer cells that forces reliance on the intra-S-phase checkpoint to ensure faithful genome duplication. Inhibitors of the intra-S-phase checkpoint kinases ATR and CHK1 have been developed, but resistance to these drugs remains problematic. Understanding drug tolerance mechanisms is impeded by analysis of bulk samples, which neglect tumor heterogeneity and often fail to accurately interpret cell cycle-mediated resistance. Here, by combining intracellular immunostaining and single-cell RNA-sequencing, we characterized the transcriptomes of oncogenic RAS-expressing cells with variable levels of RS when challenged with a CHK1 inhibitor combined with gemcitabine. We identified 37 genes differentially expressed between tolerant and

SUBMITTER: Segeren HA 

PROVIDER: S-EPMC12161472 | biostudies-literature | 2025 Jun

REPOSITORIES: biostudies-literature