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Histone H3.3 is required to maintain replication fork progression after UV damage.

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Variant histone H3.3 is crucial for cellular response to UV damage and replication fork stability. Cells lacking H3.3 show UV hypersensitivity and impaired DNA replication fork progression.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Genetics

Background:

  • Histone H3.3 is expressed throughout the cell cycle and incorporated into chromatin independently of DNA replication.
  • H3.3 has recently been linked to cellular responses to ultraviolet (UV) light exposure.

Purpose of the Study:

  • To investigate the role of histone H3.3 in cellular response to UV damage and its impact on DNA replication.
  • To elucidate the specific mechanisms and residues involved in H3.3's function.

Main Methods:

  • Utilized chicken DT40 cell lines lacking H3.3.
  • Performed epistasis analysis to assess DNA repair pathways.
  • Investigated replication fork progression on UV-damaged DNA.
  • Employed site-directed mutagenesis to analyze specific H3.3 residues.

Main Results:

  • H3.3-deficient cells exhibit hypersensitivity to UV light, suggesting impaired nucleotide excision repair.
  • These cells also show defective replication fork progression on UV-damaged DNA, independent of nucleotide excision repair.
  • Specific residues in the H3.3 α2 helix are essential for both UV resistance and replication fork stability.
  • Mutations at S31, K27, and G34 affect H3.3's ability to confer UV resistance and/or maintain fork progression.

Conclusions:

  • Histone H3.3 plays a critical dual role in DNA damage response, facilitating both repair and replication fork stability.
  • The α2 helix and specific residues like S31 are vital for H3.3's function in UV tolerance and replication.
  • H3.3 incorporation during replication may mark lesion bypass sites and aid in subsequent DNA damage processing.