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XB-ART-41008
Science 2009 Dec 18;3265960:1698-701. doi: 10.1126/science.1182372.
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The Fanconi anemia pathway promotes replication-dependent DNA interstrand cross-link repair.

Knipscheer P , Räschle M , Smogorzewska A , Enoiu M , Ho TV , Schärer OD , Elledge SJ , Walter JC .


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Fanconi anemia is a human cancer predisposition syndrome caused by mutations in 13 Fanc genes. The disorder is characterized by genomic instability and cellular hypersensitivity to chemicals that generate DNA interstrand cross-links (ICLs). A central event in the activation of the Fanconi anemia pathway is the mono-ubiquitylation of the FANCI-FANCD2 complex, but how this complex confers ICL resistance remains enigmatic. Using a cell-free system, we showed that FANCI-FANCD2 is required for replication-coupled ICL repair in S phase. Removal of FANCD2 from extracts inhibits both nucleolytic incisions near the ICL and translesion DNA synthesis past the lesion. Reversal of these defects requires ubiquitylated FANCI-FANCD2. Our results show that multiple steps of the essential S-phase ICL repair mechanism fail when the Fanconi anemia pathway is compromised.

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Species referenced: Xenopus laevis
Genes referenced: fancd2 fanci

References [+] :
Akkari, The 4N cell cycle delay in Fanconi anemia reflects growth arrest in late S phase. 2001, Pubmed