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FANCD2 and CtIP Cooperate to Repair DNA Interstrand Crosslinks


Murina, Olga; von Aesch, Christine; Karakus, Ufuk; Ferretti, Lorenza P; Bolck, Hella A; Hänggi, Kay; Sartori, Alessandro A (2014). FANCD2 and CtIP Cooperate to Repair DNA Interstrand Crosslinks. Cell Reports, 7(4):1030-1038.

Abstract

The resolution of DNA interstrand crosslinks (ICLs) requires a complex interplay between several processes of DNA metabolism, including the Fanconi anemia (FA) pathway and homologous recombination (HR). FANCD2 monoubiquitination and CtIP-dependent DNA-end resection represent key events in FA and HR activation, respectively, but very little is known about their functional relationship. Here, we show that CtIP physically interacts with both FANCD2 and ubiquitin and that monoubiquitinated FANCD2 tethers CtIP to damaged chromatin, which helps channel DNA double-strand breaks generated during ICL processing into the HR pathway. Consequently, CtIP mutants defective in FANCD2 binding fail to associate with damaged chromatin, which leads to increased levels of nonhomologous end-joining activity and ICL hypersensitivity. Interestingly, we also observe that CtIP depletion aggravates the genomic instability in FANCD2-deficient cells. Thus, our data indicate that FANCD2 primes CtIP-dependent resection during HR after ICL induction but that CtIP helps prevent illegitimate recombination in FA cells.

Abstract

The resolution of DNA interstrand crosslinks (ICLs) requires a complex interplay between several processes of DNA metabolism, including the Fanconi anemia (FA) pathway and homologous recombination (HR). FANCD2 monoubiquitination and CtIP-dependent DNA-end resection represent key events in FA and HR activation, respectively, but very little is known about their functional relationship. Here, we show that CtIP physically interacts with both FANCD2 and ubiquitin and that monoubiquitinated FANCD2 tethers CtIP to damaged chromatin, which helps channel DNA double-strand breaks generated during ICL processing into the HR pathway. Consequently, CtIP mutants defective in FANCD2 binding fail to associate with damaged chromatin, which leads to increased levels of nonhomologous end-joining activity and ICL hypersensitivity. Interestingly, we also observe that CtIP depletion aggravates the genomic instability in FANCD2-deficient cells. Thus, our data indicate that FANCD2 primes CtIP-dependent resection during HR after ICL induction but that CtIP helps prevent illegitimate recombination in FA cells.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:04 Faculty of Medicine > Institute of Molecular Cancer Research
07 Faculty of Science > Institute of Molecular Cancer Research
Dewey Decimal Classification:570 Life sciences; biology
Language:English
Date:2014
Deposited On:20 May 2014 12:58
Last Modified:08 Dec 2017 05:37
Publisher:Cell Press (Elsevier)
ISSN:2211-1247
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.1016/j.celrep.2014.03.069
PubMed ID:24794434

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