Histone H4K20 methylation mediated chromatin compaction threshold ensures genome integrity by limiting DNA replication licensing

Shoaib, Muhammad, Walter, David, Gillespie, Peter J., Izard, Fanny, Fahrenkrog, Birthe, Lleres, David, Lerdrup, Mads, Johansen, Jens Vilstrup, Hansen, Klaus, Julien, Eric, Blow, J. Julian and Sørensen, Claus S. (2018) Histone H4K20 methylation mediated chromatin compaction threshold ensures genome integrity by limiting DNA replication licensing. Nature Communications, 9. ISSN 2041-1723

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The decompaction and re-establishment of chromatin organization immediately after mitosis is essential for genome regulation. Mechanisms underlying chromatin structure control in daughter cells are not fully understood. Here we show that a chromatin compaction threshold in cells exiting mitosis ensures genome integrity by limiting replication licensing in G1 phase. Upon mitotic exit, chromatin relaxation is controlled by SET8-dependent methylation of histone H4 on lysine 20. In the absence of either SET8 or H4K20 residue, substantial genome-wide chromatin decompaction occurs allowing excessive loading of the origin recognition complex (ORC) in the daughter cells. ORC overloading stimulates aberrant recruitment of the MCM2-7 complex that promotes single-stranded DNA formation and DNA damage. Restoring chromatin compaction restrains excess replication licensing and loss of genome integrity. Our findings identify a cell cycle-specific mechanism whereby fine-tuned chromatin relaxation suppresses excessive detrimental replication licensing and maintains genome integrity at the cellular transition from mitosis to G1 phase.

Item Type: Article
Additional Information: Funding information: C.S.S., M.S., and D.W. are funded by The Novo Nordisk Foundation (to C.S.S.), The Danish Cancer Society (to C.S.S.), The Lundbeck Foundation (to C.S.S.), and The Danish Medical Research Council (to C.S.S.), Swiss National Science Foundation (to D.W.), and Villum Foundation (to M.S.). B.F. is funded by FNRS Belgium and P.J.G. and J.J.B. are funded by Cancer Research UK (grant C303/A14301). F.I. and E.J. were supported by grants from French Plan-Cancer (EPIG2013-13), Labex EpiGenMed, and SIRIC Montpellier Cancer. F.I. was supported by a PhD fellowship from the French Ligue Contre le Cancer and Fondation pour la Recherche Médicale. D.L. was supported by a Cancéropole GSO-Emergence grant (2014-E17) and CNRS.
Uncontrolled Keywords: mri 3d visualization,mri images,medical image processing,medical imaging,tumor segmentation and classification
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Depositing User: LivePure Connector
Date Deposited: 10 Jun 2024 09:30
Last Modified: 10 Jun 2024 09:30
URI: https://ueaeprints.uea.ac.uk/id/eprint/95422
DOI: 10.1038/s41467-018-06066-8

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