An intrinsic S/G₂ checkpoint enforced by ATR.

ABSTRACT: The cell cycle is strictly ordered to ensure faithful genome duplication and chromosome segregation. Control mechanisms establish this order by dictating when a cell transitions from one phase to the next. Much is known about the control of the G₁/S, G₂/M, and metaphase/anaphase transitions, but thus far, no control mechanism has been identified for the S/G₂ transition. Here we show that cells transactivate the mitotic gene network as they exit the S phase through a CDK1 (cyclin-dependent kinase 1)-directed FOXM1 phosphorylation switch. During normal DNA replication, the checkpoint kinase ATR (ataxia-telangiectasia and Rad3-related) is activated by ETAA1 to block this switch until the S phase ends. ATR inhibition prematurely activates FOXM1, deregulating th

SUBMITTER: Saldivar JC 

PROVIDER: S-EPMC6365305 | biostudies-literature | 2018 Aug

REPOSITORIES: biostudies-literature