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Cost-free lifespan extension via optimization of gene expression in adulthood aligns with the developmental theory of ageing

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@article{33958a750b5a4e62b35f8f3c23427bea,
title = "Cost-free lifespan extension via optimization of gene expression in adulthood aligns with the developmental theory of ageing",
abstract = "Ageing evolves because the force of selection on traits declines with age but the proximate causes of ageing are incompletely understood. The {\textquoteleft}disposable soma{\textquoteright} 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 {\textquoteleft}longevity{\textquoteright} 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.",
keywords = "ageing, developmental theory of ageing, life-history evolution, lifespan, senescence",
author = "Lind, {Martin I.} and Hanne Carlsson and Duxbury, {Elizabeth M. L.} and Edward Ivimey-Cook and Maklakov, {Alexei A.}",
year = "2021",
month = feb,
day = "10",
doi = "10.1098/rspb.2020.1728",
language = "English",
volume = "288",
journal = "Proceedings of the Royal Society B: Biological Sciences",
issn = "0962-8452",
publisher = "Royal Society of London",
number = "1944",

}

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TY - JOUR

T1 - Cost-free lifespan extension via optimization of gene expression in adulthood aligns with the developmental theory of ageing

AU - Lind, Martin I.

AU - Carlsson, Hanne

AU - Duxbury, Elizabeth M. L.

AU - Ivimey-Cook, Edward

AU - Maklakov, Alexei A.

PY - 2021/2/10

Y1 - 2021/2/10

N2 - 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.

AB - 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.

KW - ageing

KW - developmental theory of ageing

KW - life-history evolution

KW - lifespan

KW - senescence

UR - http://www.scopus.com/inward/record.url?scp=85101285004&partnerID=8YFLogxK

U2 - 10.1098/rspb.2020.1728

DO - 10.1098/rspb.2020.1728

M3 - Article

VL - 288

JO - Proceedings of the Royal Society B: Biological Sciences

JF - Proceedings of the Royal Society B: Biological Sciences

SN - 0962-8452

IS - 1944

M1 - 20201728

ER -

ID: 186072622