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- W3092549230 abstract "Abstract DNA lesions in S phase threaten genome stability. The DNA damage tolerance (DDT) pathways overcome these obstacles and allow completion of DNA synthesis by the use of specialised translesion (TLS) DNA polymerases or through recombination-related processes. However, how these mechanisms coordinate with each other and with bulk replication remain elusive. To address these issues, we monitored the variation of replication intermediate architecture in response to ultraviolet irradiation using transmission electron microscopy. We show that the TLS polymerase η , able to accurately bypass the major UV lesion and mutated in the skin cancer-prone xeroderma pigmentosum variant (XPV) syndrome, acts at the replication fork to resolve uncoupling and prevent post-replicative gap accumulation. Repriming occurs as a compensatory mechanism when this on-the-fly mechanism cannot operate, and is therefore predominant in XPV cells. Interestingly, our data support a recombination-independent function of RAD51 at the replication fork to sustain repriming. Finally, we provide evidence for the post-replicative commitment of recombination in gap repair and for pioneering observations of in vivo recombination intermediates. Altogether, we propose a chronology of UV damage tolerance in human cells that highlights the key role of pol η in shaping this response and ensuring the continuity of DNA synthesis." @default.
- W3092549230 created "2020-10-15" @default.
- W3092549230 creator A5001091886 @default.
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- W3092549230 date "2020-10-12" @default.
- W3092549230 modified "2023-10-06" @default.
- W3092549230 title "Replication intermediate architecture reveals the chronology of DNA damage tolerance pathways at UV-stalled replication forks in human cells" @default.
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- W3092549230 doi "https://doi.org/10.1101/2020.10.12.336107" @default.
- W3092549230 hasPublicationYear "2020" @default.
- W3092549230 type Work @default.
- W3092549230 sameAs 3092549230 @default.