Temperature effects on life-history trade-offs, germline maintenance and mutation rate under simulated climate warming

Mutation has a fundamental influence over evolutionary processes, but how evolutionary processes shape mutation rate remains less clear. In asexual unicellular organism, increased mutation rates have been observed in stressful environments and the reigning paradigm ascribes this increase to selectio...

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Published in:Proceedings of the Royal Society. B, Biological sciences Biological sciences, 2017-11, Vol.284 (1866), p.20171721-20171721
Main Authors: Berger, David, Stångberg, Josefine, Grieshop, Karl, Martinossi-Allibert, Ivain, Arnqvist, Göran
Format: Article
Language:English
Subjects:
Acclimatization
Animals
Biodiversity
Biological evolution
Climate
Climate Change
Coleoptera - physiology
Deoxyribonucleic acid
DNA
DNA repair
Evolution
Female
Genetic diversity
Germ-Line Mutation
Global warming
Life History
Life History Traits
Longevity
Male
Mutation
Mutation Rate
Mutation rates
Offspring
Phenotypic Plasticity
Repair
Reproduction
Reproduction (biology)
Resource allocation
Simulation
Species extinction
Temperature Adaptation
Temperature effects
Trade-Off
Tradeoffs
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Summary:Mutation has a fundamental influence over evolutionary processes, but how evolutionary processes shape mutation rate remains less clear. In asexual unicellular organism, increased mutation rates have been observed in stressful environments and the reigning paradigm ascribes this increase to selection for evolvability. However, this explanation does not apply in sexually reproducing species, where little is known about how the environment affects mutation rate. Here we challenged experimental lines of seed beetle, evolved at ancestral temperature or under simulated climate warming, to repair induced mutations at ancestral and stressful temperature. Results show that temperature stress causes individuals to pass on a greater mutation load to their grand-offspring. This suggests that stress-induced mutation rates, in unicellular and multicellular organisms alike, can result from compromised germline DNA repair in low condition individuals. Moreover, lines adapted to simulated climate warming had evolved increased longevity at the cost of reproduction, and this allocation decision improved germline repair. These results suggest that mutation rates can be modulated by resource allocation trade-offs encompassing life-history traits and the germline and have important implications for rates of adaptation and extinction as well as our understanding of genetic diversity in multicellular organisms.
ISSN:0962-8452
1471-2954
1471-2954
DOI:10.1098/rspb.2017.1721