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EMBO Rep. 2010 Jun;11(6):452-8. doi: 10.1038/embor.2010.46. Epub 2010 Apr 9.

Recovery from a DNA-damage-induced G2 arrest requires Cdk-dependent activation of FoxM1.

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  • 1Department of Medical Oncology, UMC Utrecht, Universiteitsweg 100, Stratenum 2.118, Utrecht 3584 CG, The Netherlands.

Abstract

Activation of the DNA-damage checkpoint culminates in the inhibition of cyclin-dependent kinase (Cdk) complexes to prevent cell-cycle progression. We have shown recently that Cdk activity is required for activation of the Forkhead transcription factor FoxM1, an important regulator of gene expression in the G2 phase of the cell cycle. Here, we show that FoxM1 is transcriptionally active during a DNA-damage-induced G2 arrest and is essential for checkpoint recovery. Paradoxically, Cdk activity, although reduced after checkpoint activation, is required to maintain FoxM1-dependent transcription during the arrest and for expression of pro-mitotic targets such as cyclin A, cyclin B and Plk1. Indeed, we find that cells need to retain sufficient levels of Cdk activity during the DNA-damage response to maintain cellular competence to recover from a DNA-damaging insult.

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PMID:
20379221
[PubMed - indexed for MEDLINE]
PMCID:
PMC2892325
Free PMC Article

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