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Quantifying the stochastic component of epigenetic aging
Abstract
DNA methylation clocks can accurately estimate chronological age and, to some extent, also biological age, yet the process by which age-associated DNA methylation (DNAm) changes are acquired appears to be quasi-stochastic, raising a fundamental question: how much of an epigenetic clock’s predictive accuracy could be explained by a stochastic process of DNAm change? Here, using DNAm data from sorted immune cells, we build realistic simulation models, subsequently demonstrating in over 22,770 sorted and whole-blood samples from 25 independent cohorts that approximately 66–75% of the accuracy underpinning Horvath’s clock could be driven by a stochastic process. This fraction increases to 90% for the more accurate Zhang’s clock, but is lower (63%) for the PhenoAge clock, suggesting that biological aging is reflected by nonstochastic processes. Confirming this, we demonstrate that Horvath’s age acceleration in males and PhenoAge’s age acceleration in severe coronavirus disease 2019 cases and smokers are not driven by an increased rate of stochastic change but by nonstochastic processes. These results significantly deepen our understanding and interpretation of epigenetic clocks.
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“Our data support prior claims that generation 1 clocks such as Horvath1 largely reflect stochastic epigenetic noise, whereas generation 2+ biomarkers capture more structured, biologically meaningful change19.”
From Responsiveness of epigenetic aging biomarkers to longevity interventions in humans (2026) · cites this paper as [19]
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DNA methylation age of human tissues and cell types
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“It is widely known that a substantial component of age-associated DNAm changes in mitotic tissues is associated with cell division 32,45–47 , 55– 57 .”
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Responsiveness of epigenetic aging biomarkers to longevity interventions in humans
Sehgal, R., Borrus, D., Armstrong, J. F., Gonzalez, J., Kasamoto, J., Markov, Y., Priyanka, A., Smith, R., Carreras-Gallo, N., Lasky-Su, J., et al. (2026) · Nature Medicine · doi:10.1038/s41591-026-04562-9 · Cited by 31
Self-citation
Metadata
- Authors
- Tong, H., Dwaraka, V. B., Chen, Q., Luo, Q., Lasky-Su, J. A., Smith, R., & Teschendorff, A. E.
- Venue
- Nature Aging
- Published
- 2024-05-09
- Volume
- 4
- Issue
- 6
- Pages
- 886-901
- ISSN
- 2662-8465
- PMC
- PMC11186785
- Cited by
- 83
- References
- 14
- Language
- en
- Funders
- National Natural Science Foundation of China (32370699, 32170652, 31970632)
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