Aging cellJan 3, 2026

A Histone Pattern Associated with Cellular Aging

Longevity & Aging Weekly Brief ↗PubMed ↗DOI ↗OA ↗

Updated Jun 27, 2026

Abstract

Essence

H3K79 methylation spreading and H4R3 methylation changes appear to shape gene upregulation during .

Evidence

Cell-based epigenomic and pharmacologic perturbation analyses linked promoter H4R3me2s loss, gene-body H3K79me3 accumulation, and H4R3me2s-to-H4R3me2as switching with transcription in replicative senescence and late-passage cells.

Caveat

The findings are from cellular senescence models, so the proposed biomarkers and therapeutic targets need validation in tissues, organisms, and disease settings.

Simplified

Cell states and biological processes are defined by their epigenetic profiles, distinctive composites of DNA- and histone-based chromatin components. However, the specific histone posttranslational modifications that distinguish cellular senescence and the impact of their distribution on transcription, especially with regard to gene length, have not been fully elucidated. Here, we show that promoter loss of symmetric dimethylated H4R3 (H4R3me) and spreading of trimethylated H3K79 (H3K79me) across gene bodies are functional features of associated with gene upregulation. We report that highly upregulated genes in replicative senescence exhibit enrichment of H3K79meand, in contrast to the characteristic trend of aging cells and tissues, are substantially longer than those that are significantly downregulated. Furthermore, by assessing all expressed genes, we demonstrate that gene body accumulation of H3K79meduring the transition to replicative senescence constitutes a broader phenomenon that is positively correlated with gene length and expression level genome-wide. Consistently, pharmacological inhibition of H3K79medeposition attenuates gene upregulation in replicative senescence. We also document a striking increase in the levels of H3K79meas well as a robust H4R3meto asymmetric dimethylated H4R3 (H4R3me) epigenetic switch that manifest globally in late-passage cells, suggesting that these might represent novel molecular biomarkers of replicative senescence. Finally, we implicate the associated epigenetic regulators, including DOT1L, PRMT1, PRMT5, and JMJD6, as modifiers of cellular lifespan, potentially disclosing unappreciated therapeutic targets for interventions in normal and pathological aging. Collectively, our findings provide novel insights into the histone code that mediates altered transcriptional regulation in replicative senescence. (2s) 3 3 3 3 3 (2s) (2as)

Full Text

What this is

This research investigates the linked to .
It identifies specific epigenetic changes that correlate with gene expression alterations.
The findings suggest potential biomarkers and therapeutic targets for aging-related interventions.

Essence

Promoter loss of symmetric dimethylated H4R3 and accumulation of trimethylated H3K79 are linked to gene upregulation in .

Key takeaways

Loss of symmetric dimethylated H4R3 and increased trimethylated H3K79 are functional features of . These modifications correlate with longer, highly upregulated genes, contrasting with shorter, downregulated genes.
Gene body accumulation of H3K79me during is positively correlated with gene length and expression level across the genome. This suggests a broader phenomenon affecting gene regulation.
Pharmacological inhibition of H3K79me reduces gene upregulation in senescent cells, indicating its role in transcriptional regulation during aging.

Definitions

replicative senescence: A state where cells lose the ability to divide and function, often associated with aging.
histone modifications: Chemical changes to histone proteins that can influence gene expression and chromatin structure.

Simplified

Author Contributions

Y.S., M.G.R., T.S., and C.T. conceived the project. T.S. generated most of the constructs, established modified cell lines, and performed functional genomics assays. C.T. carried out the long‐term cultures and PD curves. T.S., A.G., and D.M. performed the bioinformatic analyses. Sample preparations for deep sequencing were done by K.O. and T.S. Preliminary in vivo data were provided by Z.Z. Revision experiments/analyses were performed by M.J.F. T.S., M.J.F., M.G.R., and Y.S. wrote and edited the manuscript, with input from C.T.

Funding

This work was supported by NIH grants to Y.S. and M.G.R. (R01AG069750, R01DK127778, R01AG057706, and 5R01AG06152).

Conflicts of Interest

The authors declare no conflicts of interest.

Supporting information

Funding

Competing interests

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PubMed

A Histone Pattern Associated with Cellular Aging

Abstract

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Abstract

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What this is

Essence

Key takeaways

Definitions

Author Contributions

Funding

Conflicts of Interest

Supporting information

Funding

Competing interests

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