Replication stress interferes with histone recycling and predeposition marking of new histones

Zuzana Jasencakova, Annette N D Scharf, Katrine Ask, Armelle Corpet, Axel Imhof, Geneviève Almouzni, Anja Groth

    Research output: Contribution to journalJournal articleResearchpeer-review

    225 Citations (Scopus)

    Abstract

    To restore chromatin on new DNA during replication, recycling of histones evicted ahead of the fork is combined with new histone deposition. The Asf1 histone chaperone, which buffers excess histones under stress, is a key player in this process. Yet how histones handled by human Asf1 are modified remains unclear. Here we identify marks on histones H3-H4 bound to Asf1 and changes induced upon replication stress. In S phase, distinct cytosolic and nuclear Asf1b complexes show ubiquitous H4K5K12diAc and heterogeneous H3 marks, including K9me1, K14ac, K18ac, and K56ac. Upon acute replication arrest, the predeposition mark H3K9me1 and modifications typical of chromatin accumulate in Asf1 complexes. In parallel, ssDNA is generated at replication sites, consistent with evicted histones being trapped with Asf1. During recovery, histones stored with Asf1 are rapidly used as replication resumes. This shows that replication stress interferes with predeposition marking and histone recycling with potential impact on epigenetic stability.
    Original languageEnglish
    JournalMolecular Cell
    Volume37
    Issue number5
    Pages (from-to)736-43
    Number of pages8
    ISSN1097-2765
    DOIs
    Publication statusPublished - 12 Mar 2010

    Keywords

    • Acetylation
    • Blotting, Western
    • Cell Cycle Proteins
    • Cell Nucleus
    • Chromatin Assembly and Disassembly
    • Cytosol
    • DNA Replication
    • DNA, Single-Stranded
    • Hela Cells
    • Histones
    • Humans
    • Methylation
    • Nuclear Proteins
    • Nucleosomes
    • Protein Binding
    • Protein Processing, Post-Translational
    • S Phase
    • Stress, Physiological
    • Tandem Mass Spectrometry
    • Time Factors
    • Transfection

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