CtIP mediates replication fork recovery in a FANCD2-regulated manner

Jung Eun Yeo, Eu Han Lee, Eric A. Hendrickson, Alexandra Sobeck

Research output: Contribution to journalArticle

46 Citations (Scopus)

Abstract

Fanconi anemia (FA) is a chromosome instability syndrome characterized by increased cancer predisposition. Within the FA pathway, an upstream FA core complex mediates monoubiquitination and recruitment of the central FANCD2 protein to sites of stalled replication forks. Once recruited, FANCD2 fulfills a dual role towards replication fork recovery: (i) it cooperates withBRCA2and RAD51 to protect forks from nucleolytic degradation and (ii) it recruits the BLM helicase to promote replication fork restart while suppressing new origin firing. Intriguingly, FANCD2 and its interaction partners are also involved in homologous recombination (HR) repair of DNA double-strand breaks, hinting that FANCD2 utilizes HR proteins to mediate replication fork recovery. One such candidate is CtIP (CtBP-interacting protein), a key HR repair factor that functions in complex with BRCA1 and MRE11, but has not been investigated as putative player in the replication stress response. Here, we identify CtIP as a novel interaction partner of FANCD2. CtIP binds and stabilizes FANCD2 in a DNA damage- and FA core complex-independent manner, suggesting that FANCD2 monoubiquitination is dispensable for its interaction with CtIP. Following cellular treatment with a replication inhibitor, aphidicolin, FANCD2 recruits CtIP to transiently stalled, as well as collapsed, replication forks on chromatin. At stalled forks, CtIP cooperates with FANCD2 to promote fork restart and the suppression of new origin firing. Both functions are dependent on BRCA1 that controls the step-wise recruitment of MRE11, FANCD2 and finally CtIP to stalled replication forks, followed by their concerted actions to promote fork recovery.

Original languageEnglish (US)
Article numberddu078
Pages (from-to)3695-3705
Number of pages11
JournalHuman molecular genetics
Volume23
Issue number14
DOIs
StatePublished - Jul 2014

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Fanconi Anemia
Proteins
Recombinational DNA Repair
Fanconi Anemia Complementation Group D2 Protein
DNA Repair-Deficiency Disorders
Aphidicolin
Homologous Recombination
DNA Damage
Chromatin
Neoplasms

Cite this

CtIP mediates replication fork recovery in a FANCD2-regulated manner. / Yeo, Jung Eun; Lee, Eu Han; Hendrickson, Eric A.; Sobeck, Alexandra.

In: Human molecular genetics, Vol. 23, No. 14, ddu078, 07.2014, p. 3695-3705.

Research output: Contribution to journalArticle

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