Abstract
The eukaryotic DNA replication machinery must traverse every nucleosome in the genome during S phase. As nucleosomes are generally inhibitory to DNA-dependent processes, chromatin structure must undergo extensive reorganization to facilitate DNA synthesis. However, the identity of chromatin-remodeling factors involved in replication and how they affect DNA synthesis is largely unknown. Here we show that two highly conserved ATP-dependent chromatin-remodeling complexes in Saccharomyces cerevisiae, Isw2 and Ino80, function in parallel to promote replication fork progression. As a result, Isw2 and Ino80 have especially important roles for replication of late-replicating regions during periods of replication stress. Both Isw2 and Ino80 complexes are enriched at sites of replication, suggesting that these complexes act directly to promote fork progression. These findings identify ATP-dependent chromatin-remodeling complexes that promote DNA replication and define a specific stage of replication that requires remodeling for normal function.
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Acknowledgements
We thank G.M. Alvino, S. Biggins, B.J. Brewer, D. Collingwood, H.S. Malik, M.K. Raghuraman and members of the Tsukiyama laboratory for critical reading of the manuscript; J.F.X. Diffley (Cancer Research UK) for the YJT80 strain; members of the Biggins and Brewer-Raghuraman laboratories for helpful discussions; D. Collingwood for help with analysis of replication data; H.S. Malik for the manuscript title suggestion; C.L. Peterson for sharing data before publication; and G.M. Alvino for a DNA-labeling protocol for microarrays, technical advice on density transfer experiments and help with replication data analysis. This work was supported by grants to T.T. from the US National Institutes of Health (NIH) and the Leukemia and Lymphoma Society. J.A.V. and T.J.K. were supported in part by training grants from the NIH.
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J.A.V. designed and conducted the drug sensitivity, FACS, DNA microarray and DNA replication experiments, and wrote the manuscript; T.J.K. designed and conducted the ChIP experiments; T.T. supervised the project and contributed as the senior author. All authors contributed to the preparation of the manuscript.
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Vincent, J., Kwong, T. & Tsukiyama, T. ATP-dependent chromatin remodeling shapes the DNA replication landscape. Nat Struct Mol Biol 15, 477–484 (2008). https://doi.org/10.1038/nsmb.1419
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DOI: https://doi.org/10.1038/nsmb.1419
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