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Related Experiment Videos

NuA4 subunit Yng2 function in intra-S-phase DNA damage response.

John S Choy1, Stephen J Kron

  • 1Department of Molecular Genetics and Cell Biology. Center for Molecular Oncology, University of Chicago, Chicago, Illinois 60637, USA.

Molecular and Cellular Biology
|November 6, 2002
PubMed
Summary

Histone acetylation is crucial for DNA replication and repair. Loss of histone H4 acetylation in yng2 mutants sensitizes cells to DNA damage, highlighting its role in maintaining genomic integrity.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Epigenetics

Background:

  • Regulated transcription relies on histone acetylation for open chromatin.
  • The role of histone acetylation in DNA replication and repair is not well understood.

Purpose of the Study:

  • To investigate the role of nucleosomal histone acetylation in DNA replication and repair.
  • To determine the function of the NuA4 subunit Yng2 in maintaining genomic integrity.

Main Methods:

  • Analysis of yng2 mutants' sensitivity to DNA damage agents.
  • Assessment of intra-S-phase checkpoint delay and DNA repair kinetics.
  • Investigation of histone H3 and H4 acetylation roles using GCN5 and Yng2 mutants.
  • Evaluation of DNA repair pathway proficiency in yng2 mutants.

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Main Results:

  • yng2 mutants, deficient in H4 acetylation, are sensitive to S-phase DNA damage.
  • MMS treatment in yng2 mutants causes a persistent Mec1-dependent intra-S-phase checkpoint delay.
  • Restoring H4 acetylation with trichostatin A aids checkpoint recovery.
  • Mutants lacking GCN5 (H3 acetyltransferase) show similar sensitivity to intra-S-phase DNA damage.
  • gcn5 yng2 double mutants are inviable, suggesting overlapping roles for H3 and H4 acetylation.
  • yng2 mutants tolerate nonhomologous end joining defects but not homologous recombination proficiency.

Conclusions:

  • Nucleosomal histone acetylation is implicated in maintaining genomic integrity during chromosomal replication.
  • Histone H3 and H4 acetylation play overlapping roles in DNA replication and repair.