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DNA repair is a collection of cellular processes that detect and correct damage or copying errors in DNA. Different problems call for different repair pathways, and repair is neither perfect nor unlimited. Researchers study how DNA damage and repair relate to ageing, but no single repair pathway explains ageing, and current findings do not establish a consumer product or supplement that improves DNA repair in people.
What DNA repair does
DNA stores the instructions cells use to function. Damage to DNA, or errors made when it is copied, can disrupt those instructions. Cells have maintenance systems that recognize a problem, remove or process damaged material, rebuild DNA where needed, and seal the strand.
“DNA repair” is an umbrella term, not one universal tool. The kind of damage and its location help determine which cellular process responds. Repair helps preserve genome integrity, but it cannot prevent every lesion or guarantee that every error is corrected.
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How repair pathways differ
Pathways vary in what they recognize and how they restore DNA. Some remove damaged material and synthesize replacement DNA; others can use a similar DNA sequence as a template. The examples below illustrate those differences without implying that a short description captures every molecular step.
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Nucleotide excision repair
A 2015 research slide hosted by the National Human Genome Research Institute (NHGRI) illustrates two ways nucleotide excision repair can recognize a lesion: global-genome repair and transcription-coupled repair. The branches converge on lesion processing, replacement DNA synthesis, and ligation, which seals the DNA strand. The slide is a teaching illustration, not a definitive modern protocol. View the NHGRI-hosted slide.
Homologous recombination
Homologous recombination involves the exchange of DNA between similar or identical sequences. That definition indicates the role of sequence similarity, but does not by itself explain the full repair process or all the contexts in which it operates. NHGRI defines homologous recombination.
Why DNA repair matters in ageing research
The National Institute on Aging (NIA) describes ageing as involving the gradual accumulation of damage to molecules and cells, while noting that the body has built-in repair mechanisms that can become less effective over time. As the agency puts it: “Unlike a car, our bodies have built-in mechanisms for repairing this damage. But even these repair mechanisms wear out over time.” NIA’s explainer on whether ageing can be slowed.
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What human studies can—and cannot—tell us
A 2023 study by Smith and colleagues analyzed 52 participants aged 45–49 from the HANDLS study. Using CometChip measures, the researchers assessed baseline single-strand breaks, hydrogen-peroxide-induced oxidative damage, and DNA repair capacity. They reported interactions involving induced damage or repair capacity and factors including frailty, sex, poverty, and cytokines. In this sample, baseline single-strand breaks were not associated with frailty, poverty, race, or sex.
The study is a small observational analysis, not a test of an intervention or proof that a demographic characteristic determines an individual’s repair ability. The authors call for validation in larger samples and different populations. Its findings do not establish a universal pattern in how DNA damage or repair changes with age. Read the 2023 study in DNA Repair.
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Do NAD+ supplements improve DNA repair?
The evidence cited here does not show that NAD+ supplements improve DNA repair or healthy ageing in people. An NIA report on a 2017 study says that decreasing NAD+ levels may affect DNA repair, based on work in mice and tissue-cultured cells. NIA laboratory material also describes NAD+ precursors as partially rescuing mitochondrial phenotypes in experimental systems and species. These findings are experimental and do not establish a human benefit from taking a supplement. NIA’s report on the 2017 study.
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What to take away
- DNA repair means multiple cellular pathways, each suited to different kinds of DNA damage or errors.
- Repair supports genome integrity, but it is not flawless and does not stop all damage.
- DNA damage, repair, senescence, mitochondrial function, and age-associated disease are connected research topics—not proof that one process alone determines ageing.
- Human findings depend on the study and population; a small observational study cannot establish a universal pattern or an individual’s repair capacity.
- Experimental NAD+ findings do not prove that supplements improve DNA repair or healthy ageing in humans.
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