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Updated: Jun 23, 2026
Visualizing and Quantifying Endonuclease-Based Site-Specific DNA Damage
Published on: August 21, 2021
The ageing epigenome: damaged beyond repair?
David A Sinclair1, Philipp Oberdoerffer
1The Paul F. Glenn Laboratories for the Biological Mechanisms of Ageing, Department of Pathology, Harvard Medical School, Boston, MA 02115, USA. David_Sinclair@hms.harvard.edu
Abstract:
Of all the proposed causes of ageing, DNA damage remains a leading, though still debated theory. Unlike most other types of age-related cellular damage, which can hypothetically be reversed, mutations in DNA are permanent. Such errors result in the accumulation of changes to RNA and protein sequences with age, and are tightly linked to cellular senescence and overall organ dysfunction. Over the past few years, an additional, more global role has emerged for the contribution of DNA damage and genomic instability to the ageing process. We, and others have found that DNA damage and the concomitant repair process can induce genome-wide epigenetic changes, which may promote a variety of age-related transcriptional and functional changes. Here, we discuss the link between DNA damage, chromatin alterations and ageing, an interplay that explains how seemingly random DNA damage could manifest in predictable phenotypic changes that define ageing, changes that may ultimately be reversible.
Insights
DNA damage is a key theory of aging. While DNA mutations are permanent, the resulting epigenetic changes and cellular dysfunction linked to aging may be reversible.
Area of Science:
- Genetics and Molecular Biology
- Cellular Biology
- Gerontology
Background:
- DNA damage is a leading theory of aging, distinct from other cellular damage due to its permanence.
- Accumulated DNA errors lead to altered RNA and protein sequences, cellular senescence, and organ dysfunction.
- Genomic instability and DNA damage play a significant role in the aging process.
Purpose of the Study:
- To discuss the link between DNA damage, chromatin alterations, and aging.
- To explore how DNA damage contributes to predictable phenotypic changes associated with aging.
- To investigate the potential reversibility of age-related changes induced by DNA damage.
Main Methods:
- Review of existing research on DNA damage and aging.
- Analysis of the relationship between DNA repair processes and epigenetic modifications.
- Exploration of chromatin alterations in the context of aging and DNA damage.
Main Results:
- DNA damage and repair can induce genome-wide epigenetic changes.
- These epigenetic changes are linked to age-related transcriptional and functional alterations.
- The interplay between DNA damage, chromatin, and aging explains predictable phenotypic changes.
Conclusions:
- DNA damage contributes to aging through permanent mutations and reversible epigenetic modifications.
- Chromatin alterations mediate the link between DNA damage and age-related phenotypic changes.
- The epigenetic consequences of DNA damage offer potential targets for reversing aspects of aging.
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