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Non-transcriptional Function of FOXO1/DAF-16 Contributes to Translesion DNA Synthesis.

Mol. Cell. Biol.2016 Nov;36(21):2755-2766. Epub 2016 Aug 22
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摘要


Forkhead box O (FOXO; DAF-16 in nematode) transcription factors activate a program of genes that control stress resistance, metabolism, and lifespan. Given the adverse impact of the stochastic DNA damage on organismal development and ageing, we examined the role of FOXO/DAF-16 in UV-induced DNA-damage response. Knockdown of FOXO1, but not FOXO3a, increases sensitivity to UV irradiation when exposed during S phase, suggesting a contribution of FOXO1 to translesion DNA synthesis (TLS), a replicative bypass of UV-induced DNA lesions. Actually, FOXO1 depletion results in a sustained activation of the ATR-Chk1 signaling and a reduction of PCNA monoubiquitination following UV irradiation. FOXO1 does not alter the expression of TLS-related genes but binds to the protein replication protein A (RPA1) that coats single-stranded DNA and acts as a scaffold for TLS. In Caenorhabditis elegans, daf-16 null mutants show UV-induced retardation in larval development and are rescued by overexpressing DAF-16 mutant lacking transactivation domain, but not substitution mutant unable to interact with RPA-1. Thus, our findings demonstrate that FOXO1/DAF-16 is a functional component in TLS independently of its transactivation activity.

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