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Related Experiment Videos

Chromatin assembly on replicating DNA in vitro.

G Almouzni1, D J Clark, M Méchali

  • 1Laboratory of Molecular Biology, NIDDK, National Institutes of Health, Bethesda, MD 20892.

Nucleic Acids Research
|October 11, 1990
PubMed
Summary

Replicating DNA rapidly forms chromatin through a two-step process in Xenopus egg extracts. Complementary strand synthesis is crucial for efficient histone H2A/H2B sequestration onto newly replicated DNA.

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Area of Science:

  • Molecular Biology
  • Chromatin Assembly
  • DNA Replication

Background:

  • Replicating single-stranded DNA is preferentially assembled into chromatin compared to non-replicating double-stranded DNA in Xenopus egg extracts.
  • The molecular mechanisms underlying this preferential chromatin assembly on replicating DNA are not fully understood.

Purpose of the Study:

  • To investigate the molecular basis for preferential chromatin assembly on replicating DNA.
  • To elucidate the role of complementary strand synthesis in nucleosome assembly.
  • To characterize the steps involved in chromatin assembly on replicating DNA.

Main Methods:

  • Utilized Xenopus egg extracts as a system for studying DNA replication and chromatin assembly.
  • Compared nucleosome assembly on single-stranded DNA versus double-stranded DNA templates.

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  • Investigated the requirement of complementary strand synthesis for efficient nucleosome formation.
  • Analyzed the sequestration of histones H2A/H2B onto replicated and non-replicated DNA.

    • Main Results:

    • Single-stranded DNA alone is not a preferred template for nucleosome assembly compared to double-stranded DNA.
    • Complementary strand synthesis is essential for the rapid assembly of nucleosomes on replicating DNA.
    • Chromatin assembly on replicating DNA occurs in two steps: DNA replication forming an intermediate, followed by histone H2A/H2B sequestration.
    • Histones H2A/H2B are preferentially sequestered onto replicated DNA compared to non-replicated DNA.

    Conclusions:

    • Chromatin assembly on replicating DNA is a two-step process initiated by DNA replication and subsequent histone sequestration.
    • Complementary strand synthesis is a critical prerequisite for efficient chromatin formation on replicating DNA.
    • The preferential sequestration of histones H2A/H2B onto replicated DNA drives efficient chromatin assembly during replication.