The Mgs1/WRNIP1 ATPase is required to prevent a recombination salvage pathway at damaged replication forks
Open Access
- 10 April 2020
- journal article
- research article
- Published by American Association for the Advancement of Science (AAAS) in Science Advances
- Vol. 6 (15), eaaz3327
- https://doi.org/10.1126/sciadv.aaz3327
Abstract
DNA damage tolerance (DDT) is crucial for genome integrity maintenance. DDT is mainly carried out by template switch recombination, an error-free mode of overcoming DNA lesions, or translesion DNA synthesis, which is error-prone. Here, we investigated the role of Mgs1/WRNIP1 in modulating DDT. Using budding yeast, we found that elimination of Mgs1 in cells lacking Rad5, an essential protein for DDT, activates an alternative mode of DNA damage bypass, driven by recombination, which allows chromosome replication and cell viability under stress conditions that block DNA replication forks. This salvage pathway is RAD52 and RAD59 dependent, requires the DNA polymerase δ and PCNA modification at K164, and is enabled by Esc2 and the PCNA unloader Elg1, being inhibited when Mgs1 is present. We propose that Mgs1 is necessary to prevent a potentially toxic recombination salvage pathway at sites of perturbed replication, which, in turn, favors Rad5-dependent template switching, thus helping to preserve genome stability.Funding Information
- European Research Council (Consolidator Grant 682190)
- Italian Association for Cancer Research (IG 18976)
- Spanish Ministry of Science, Innovation and Universities (BFU2016-77663-P AEI/FEDER UE)
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