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Replicative Cell Senescence02:15

Replicative Cell Senescence

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Replicative cell senescence is a property of cells that allows them to divide a finite number of times throughout the organism's lifespan while preventing excessive proliferation. Replicative senescence is associated with the gradual loss of the telomere — short, repetitive DNA sequences found at the end of the chromosomes. Telomeres are bound by a group of proteins to form a protective cap on the ends of chromosomes. Embryonic stem cells express telomerase — an enzyme that adds...
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Histone Modification02:32

Histone Modification

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The histone proteins have a flexible N-terminal tail extending out from the nucleosome. These histone tails are often subjected to post-translational modifications such as acetylation, methylation, phosphorylation, and ubiquitination. Particular combinations of these modifications form “histone codes” that influence the chromatin folding and tissue-specific gene expression.
Acetylation
The enzyme histone acetyltransferase adds acetyl group to the histones. Another enzyme, histone...
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Histone Modification02:32

Histone Modification

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Inheritance of Chromatin Structures03:17

Inheritance of Chromatin Structures

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Epigenetics is the study of inherited changes in a cell's phenotype without changing the DNA sequences. It provides a form of memory for the differential gene expression pattern to maintain cell lineage, position-effect variegation, dosage compensation, and maintenance of chromatin structures such as telomeres and centromeres. For example, the structure and location of the centromere on chromosomes are epigenetically inherited. Its functionality is not dictated or ensured by the underlying...
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Spreading of Chromatin Modifications02:25

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The histone proteins in the nucleosomes are post-translationally modified (PTM) to increase or decrease access to DNA. The commonly observed PTMs are methylation, acetylation, phosphorylation, and ubiquitination of lysine amino acids in the histone H3 tail region. These histone modifications have specific meaning for the cell. Hence, they are called "histone code". The protein complex involved in histone modification is termed as "reader-writer" complex.
Writers
The writer...
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Replication in Eukaryotes01:29

Replication in Eukaryotes

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In eukaryotic cells, DNA replication is highly conserved and tightly regulated. Multiple linear chromosomes must be duplicated with high fidelity before cell division, so there are many proteins that fulfill specialized roles in the replication process. Replication occurs in three phases: initiation, elongation, and termination, and ends with two complete sets of chromosomes in the nucleus.
Many Proteins Orchestrate Replication at the Origin
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Updated: Jan 7, 2026

Repressing Gene Transcription by Redirecting Cellular Machinery with Chemical Epigenetic Modifiers
10:28

Repressing Gene Transcription by Redirecting Cellular Machinery with Chemical Epigenetic Modifiers

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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.