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Lind, Martin I., Carlsson, Hanne, Duxbury, Elizabeth M. L. 
ORCID: https://orcid.org/0000-0002-5733-3645, Ivimey-Cook, Edward ORCID: https://orcid.org/0000-0003-4910-0443 and Maklakov, Alexei A. ORCID: https://orcid.org/0000-0002-5809-1203
(2021)
Cost-free lifespan extension via optimization of gene expression in adulthood aligns with the developmental theory of ageing.
Proceedings of the Royal Society B: Biological Sciences, 288 (1944).
ISSN 0962-8452
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Abstract
Ageing evolves because the force of selection on traits declines with age but the proximate causes of ageing are incompletely understood. The ‘disposable soma’ theory of ageing (DST) upholds that competitive resource allocation between reproduction and somatic maintenance underpins the evolution of ageing and lifespan. In contrast, the developmental theory of ageing (DTA) suggests that organismal senescence is caused by suboptimal gene expression in adulthood. While the DST predicts the trade-off between reproduction and lifespan, the DTA predicts that age-specific optimization of gene expression can increase lifespan without reproduction costs. Here we investigated the consequences for lifespan, reproduction, egg size and individual fitness of early-life, adulthood and post-reproductive onset of RNAi knockdown of five ‘longevity’ genes involved in key biological processes in Caenorhabditis elegans. Downregulation of these genes in adulthood and/or during post-reproductive period increases lifespan, while we found limited evidence for a link between impaired reproduction and extended lifespan. Our findings demonstrate that suboptimal gene expression in adulthood often contributes to reduced lifespan directly rather than through competitive resource allocation between reproduction and somatic maintenance. Therefore, age-specific optimization of gene expression in evolutionarily conserved signalling pathways that regulate organismal life histories can increase lifespan without fitness costs.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | ageing,developmental theory of ageing,life-history evolution,lifespan,senescence,biochemistry, genetics and molecular biology(all),immunology and microbiology(all),environmental science(all),agricultural and biological sciences(all) ,/dk/atira/pure/subjectarea/asjc/1300 |
| Faculty \ School: | Faculty of Science > School of Biological Sciences Faculty of Science |
| UEA Research Groups: | Faculty of Medicine and Health Sciences > Research Centres > Norwich Institute for Healthy Aging Faculty of Science > Research Groups > Organisms and the Environment |
| Related URLs: | |
| Depositing User: | LivePure Connector |
| Date Deposited: | 09 Feb 2021 01:03 |
| Last Modified: | 14 May 2023 00:48 |
| URI: | https://ueaeprints.uea.ac.uk/id/eprint/79194 |
| DOI: | 10.1098/rspb.2020.1728 |
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