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The evolutionary genetics of ageing and longevity
1Institute for Evolutionary and Ecological Sciences, Leiden University, Kaiserstraat 63, 2311 GP Leiden, The Netherlands. zwaan@rulsfb.leidenuniv.nl
Heredity
|June 26, 1999
Summary
Evolutionary theories explain ageing by reduced natural selection and optimizing early-life fitness. New data on mortality curves and mutations in fruit flies necessitate model adjustments but uphold core evolutionary principles of ageing.
Area of Science:
- Evolutionary biology
- Gerontology
Background:
- Natural selection's efficacy diminishes with age, influencing evolutionary theories of ageing.
- Environmental mortality (predation, disease, accidents) limits lifespan, independent of ageing.
- Ageing is hypothesized to evolve from optimizing early-life fitness, reinforced by late-life mutations.
Purpose of the Study:
- To review experimental data on the roles of natural selection and mutation accumulation in ageing.
- To assess how recent discoveries impact existing evolutionary models of ageing and species longevity.
Main Methods:
- Review of experimental data on ageing processes.
- Analysis of mutation accumulation lines in Drosophila melanogaster.
- Examination of mortality curve data.
Main Results:
- Experimental data on ageing processes were reviewed.
- Discoveries include levelling of mortality curves and age-specific mutations in Drosophila.
- These findings necessitate adjustments to original evolutionary models of ageing.
Conclusions:
- Adjustments to ageing models do not invalidate the fundamental rationale of evolutionary theories of ageing.
- The interplay between environmental mortality and genetic factors shapes species longevity.
- Advances in genetic mapping hold promise for rapid progress in understanding ageing.