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Cell Rep. 2014 Dec 24;9(6):2011-7. doi: 10.1016/j.celrep.2014.11.044. Epub 2014 Dec 18.

Cdk1 restrains NHEJ through phosphorylation of XRCC4-like factor Xlf1.

Author information

1
Genome Damage and Stability Centre, School of Life Sciences, University of Sussex, Brighton BN1 9RQ, UK.
2
Instituto Gulbenkian de Ciência, Oeiras 2781-901, Portugal.
3
Genome Damage and Stability Centre, School of Life Sciences, University of Sussex, Brighton BN1 9RQ, UK. Electronic address: ajd21@sussex.ac.uk.

Abstract

Eukaryotic cells use two principal mechanisms for repairing DNA double-strand breaks (DSBs): homologous recombination (HR) and nonhomologous end-joining (NHEJ). DSB repair pathway choice is strongly regulated during the cell cycle. Cyclin-dependent kinase 1 (Cdk1) activates HR by phosphorylation of key recombination factors. However, a mechanism for regulating the NHEJ pathway has not been established. Here, we report that Xlf1, a fission yeast XLF ortholog, is a key regulator of NHEJ activity in the cell cycle. We show that Cdk1 phosphorylates residues in the C terminus of Xlf1 over the course of the cell cycle. Mutation of these residues leads to the loss of Cdk1 phosphorylation, resulting in elevated levels of NHEJ repair in vivo. Together, these data establish that Xlf1 phosphorylation by Cdc2(Cdk1) provides a molecular mechanism for downregulation of NHEJ in fission yeast and indicates that XLF is a key regulator of end-joining processes in eukaryotic organisms.

PMID:
25533340
PMCID:
PMC4542292
DOI:
10.1016/j.celrep.2014.11.044
[Indexed for MEDLINE]
Free PMC Article

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