Sepil, Irem;
Hopkins, Ben R;
Dean, Rebecca;
Bath, Eleanor;
Friedman, Solomon;
Swanson, Ben;
Ostridge, Harrison J;
... Wigby, Stuart; + view all
(2020)
Male reproductive aging arises via multifaceted mating-dependent sperm and seminal proteome declines, but is postponable in Drosophila.
PNAS
, 117
(29)
pp. 17094-17103.
10.1073/pnas.2009053117.
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Abstract
Declining ejaculate performance with male age is taxonomically widespread and has broad fitness consequences. Ejaculate success requires fully functional germline (sperm) and soma (seminal fluid) components. However, some aging theories predict that resources should be preferentially diverted to the germline at the expense of the soma, suggesting differential impacts of aging on sperm and seminal fluid and trade-offs between them or, more broadly, between reproduction and lifespan. While harmful effects of male age on sperm are well known, we do not know how much seminal fluid deteriorates in comparison. Moreover, given the predicted tradeoffs, it remains unclear whether systemic lifespan-extending interventions could ameliorate the declining performance of the ejaculate as a whole. Here, we address these problems using Drosophila melanogaster. We demonstrate that seminal fluid deterioration contributes to male reproductive decline via mating-dependent mechanisms that include posttranslational modifications to seminal proteins and altered seminal proteome composition and transfer. Additionally, we find that sperm production declines chronologically with age, invariant to mating activity such that older multiply mated males become infertile principally via reduced sperm transfer and viability. Our data, therefore, support the idea that both germline and soma components of the ejaculate contribute to male reproductive aging but reveal a mismatch in their aging patterns. Our data do not generally support the idea that the germline is prioritized over soma, at least, within the ejaculate. Moreover, we find that lifespan-extending systemic down-regulation of insulin signaling results in improved late-life ejaculate performance, indicating simultaneous amelioration of both somatic and reproductive aging.
| Type: | Article |
|---|---|
| Title: | Male reproductive aging arises via multifaceted mating-dependent sperm and seminal proteome declines, but is postponable in Drosophila |
| Location: | United States |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1073/pnas.2009053117 |
| Publisher version: | https://doi.org/10.1073/pnas.2009053117 |
| Language: | English |
| Additional information: | This open access article is distributed under Creative Commons Attribution License 4.0 (CC BY). |
| Keywords: | Science & Technology, Multidisciplinary Sciences, Science & Technology - Other Topics, seminal fluid, sperm, aging, fertility, fitness, ACCESSORY-GLAND, LIFE-SPAN, COMPETITION, SUCCESS, FLUID, FERTILITY, BEHAVIOR, FEMALES, BIOLOGY, OVULIN |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences > Div of Biosciences |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10177809 |
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