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A Histone Code Functionally Linked to Replicative Senescence.

Thomas Suter1, Meyer J Friedman1, Cagdas Tazearslan2

  • 1Cellular and Molecular Medicine, Department of Medicine, University of California San Diego, La Jolla, California, USA.

Aging Cell
|January 3, 2026
PubMed
Summary
This summary is machine-generated.

Cellular senescence involves specific epigenetic changes, including altered histone modifications like H3K79me3 and H4R3me2, impacting gene expression and potentially serving as biomarkers for aging and therapeutic targets.

Keywords:
H3K79me3H4R3me(2as)H4R3me(2s)aginggene lengthhistone codereplicative senescencetranscription

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Area of Science:

  • Epigenetics and Molecular Biology
  • Cellular Biology
  • Aging Research

Background:

  • Cellular states are epigenetically defined, but specific histone modifications in senescence and their transcriptional impact remain unclear.
  • Understanding these epigenetic marks is crucial for deciphering cellular aging mechanisms.

Purpose of the Study:

  • To identify specific histone modifications associated with replicative senescence.
  • To investigate the functional impact of these modifications on gene transcription, particularly concerning gene length.
  • To explore potential epigenetic biomarkers and therapeutic targets for aging.

Main Methods:

  • Analysis of histone modifications (H4R3me(2s), H3K79me3, H4R3me(2as)) in senescent cells.
  • Assessment of gene expression and correlation with histone modification patterns and gene length.
  • Pharmacological inhibition of H3K79me3 deposition.
  • Evaluation of epigenetic regulators (DOT1L, PRMT1, PRMT5, JMJD6) in cellular lifespan.

Main Results:

  • Loss of H4R3me(2s) at promoters and gain of H3K79me3 in gene bodies characterize senescent cells, correlating with gene upregulation.
  • Upregulated genes in senescence are longer and show H3K79me3 enrichment.
  • H3K79me3 accumulation is a genome-wide phenomenon linked to gene length and expression.
  • Inhibition of H3K79me3 reduces gene upregulation in senescence.
  • A global increase in H3K79me3 and an H4R3me(2s) to H4R3me(2as) switch occur in late-passage cells.
  • Epigenetic regulators DOT1L, PRMT1, PRMT5, and JMJD6 influence cellular lifespan.

Conclusions:

  • Specific histone modifications, H3K79me3 and H4R3me(2s)/H4R3me(2as), are key epigenetic features of replicative senescence.
  • These modifications influence transcription, particularly of longer genes, and may serve as biomarkers.
  • Targeting epigenetic regulators offers potential therapeutic avenues for aging-related conditions.