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Chromatin dynamics during DNA replication.

Raz Bar-Ziv1, Yoav Voichek1, Naama Barkai1

  • 1Department of Molecular Genetics, Weizmann Institute of Science, Rehovot 76100, Israel.

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Summary
This summary is machine-generated.

DNA replication influences histone modifications, with some marks appearing immediately and others delayed by transcription. Replication-guided H3K9ac, triggered by supercoiling stress, precedes the replication fork.

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Area of Science:

  • Molecular Biology
  • Epigenetics
  • Yeast Genetics

Background:

  • Chromatin, composed of DNA and histones, regulates DNA processes via post-translational modifications.
  • DNA replication perturbs histone arrangement for polymerase progression and DNA repackaging.

Purpose of the Study:

  • To investigate how DNA replication dynamics influence histone modification patterns.
  • To understand the interplay between replication and transcription in shaping histone marks.

Main Methods:

  • Tracking cell-cycle dynamics of 10 histone modifications in budding yeast.
  • Utilizing genetic manipulation (topoisomerase depletion) and enzyme-specific analysis (Rtt109, Gcn5).

Main Results:

  • Histone marks exhibit differential deposition rates post-replication; some are immediate (H4K16ac, H3K4me1), others delayed (H3K4me3, H3K36me3).
  • H3K9ac deposition occurs in a wave preceding the replication fork, dependent on Rtt109.
  • Supercoiling stress, particularly when RNA polymerase II is stalled, triggers H3K9 acetylation.

Conclusions:

  • DNA replication and gene expression play complementary roles in determining histone modification patterns.
  • Replication-guided H3K9ac is distinct from expression-guided H3K9ac, highlighting distinct regulatory pathways.