Somatic mutation rates in mammals show a strong inverse relationship with lifespan
In short: Researchers who performed whole-genome sequencing on intestinal tissues from 16 different mammalian species found that the rate of somatic mutations is closely tied to how long an animal lives. While mutation patterns were largely similar across species, the speed at which these mutations accumulate per year was significantly higher in shorter-lived mammals.
This finding suggests that somatic mutation rates are evolutionarily constrained, potentially acting as a factor in the aging process. By comparing species with vastly different body masses and life histories, the study highlights a consistent biological trade-off between mutation accumulation and longevity.
The study analyzed 208 intestinal crypts from 56 individuals across 16 species. A limitation of this research is that it focuses on specific tissue types and does not account for all possible mutational processes across the entire body.
Why it matters: The speed at which our bodies accumulate genetic mutations appears to be fundamentally linked to our biological lifespan.
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Sources
- Source: Research: Cagan et al. (2022). Somatic mutation rates scale with lifespan across mammals. Nature. · cc by
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