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Histone H1 modulates DNA replication through multiple pathways in Xenopus egg extract

Z H Lu1, D B Sittman, D T Brown

  • 1Department of Biochemistry, University of Mississippi Medical Center, Jackson 39216-4505, USA.

Journal of Cell Science
|January 14, 1998
PubMed
Summary

Histone H1s (linker histones) slow DNA replication in Xenopus egg extract by delaying nuclear assembly and directly impacting replication processes. This modulation occurs through multiple pathways, affecting both initiation and overall replication efficiency.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Genetics

Background:

  • Histones are crucial for DNA packaging and regulating DNA-related processes.
  • Linker histones (H1s) play a role in chromatin structure and function.
  • DNA replication is a fundamental process for cell division.

Purpose of the Study:

  • To investigate the impact of histone H1 variants on DNA replication dynamics.
  • To elucidate the mechanisms by which histone H1 influences replication initiation and progression.
  • To understand the role of nuclear assembly in H1-mediated replication modulation.

Main Methods:

  • Utilized Xenopus egg extract for in vitro DNA replication studies.
  • Assembled mouse histone H1 variants (H1c and H10) onto Xenopus sperm chromatin.

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  • Analyzed chromatin structure, nuclear assembly (membrane formation, protein import, lamina formation), and DNA replication rates.
  • Investigated replication initiation timing in relation to nuclear assembly stages.

    • Main Results:

    • Histone H1 rapidly and concentration-dependently associated with sperm chromatin, maintaining nucleosomal structure.
    • H1 presence significantly reduced DNA replication rate and extent.
    • H1 delayed replication initiation by slowing nuclear lamina formation, a key step in nuclear assembly.
    • H1 also directly inhibited replication even after nuclear lamina assembly was complete.

    Conclusions:

    • Histone H1s act as negative modulators of DNA replication in Xenopus egg extract.
    • H1 exerts its inhibitory effects through at least two distinct pathways: delaying nuclear assembly and directly interfering with replication machinery.
    • These findings highlight the complex role of linker histones in regulating DNA replication fidelity and efficiency.