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The experimental evolution of aging in fruitflies
S C Stearns1, M Ackermann, M Doebeli
1Zoology Institute, University of Basel, Switzerland. stearns@ubaclu.unibas.ch
Experimental Gerontology
|February 10, 1999
Summary
The evolutionary theory of aging explains that organisms evolve to balance repair and damage. Experimental evolution in fruit flies demonstrates that higher external mortality rates accelerate aging and shorten lifespan.
Area of Science:
- Evolutionary biology
- Gerontology
- Life history theory
Background:
- Aging is characterized by cellular damage and functional decline.
- Life history theory posits that intrinsic mortality evolves in response to extrinsic mortality.
- Experimental evolution offers a method to test evolutionary hypotheses.
Purpose of the Study:
- To experimentally validate the central claim of life history theory regarding aging.
- To investigate the evolutionary response of intrinsic mortality to varying extrinsic mortality rates.
- To assess the impact of extrinsic mortality on lifespan and aging in a model organism.
Main Methods:
- Utilizing experimental evolution in the fruit fly (Drosophila melanogaster).
- Comparing the evolutionary effects of high and low adult mortality rates.
- Observing changes in intrinsic mortality rates and lifespan.
Main Results:
- Higher extrinsic mortality rates led to the evolution of higher intrinsic mortality rates.
- A direct correlation was observed between increased extrinsic mortality and a shorter lifespan.
- This study provides the first clear experimental evidence for the evolutionary theory of aging.
Conclusions:
- The findings experimentally support the life history theory of aging.
- Extrinsic mortality is a significant driver in the evolution of aging.
- Drosophila melanogaster serves as a robust model for studying evolutionary aging processes.