Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 117, Issue 29, Pages 17094-17103Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.2009053117
Keywords
seminal fluid; sperm; aging; fertility; fitness
Categories
Funding
- Biotechnology and Biological Sciences Research Council (BBSRC) Fellowship [BB/K014544/1]
- Dresden Senior Fellowship
- Kennedy Trust
- John Fell Fund
- Marie Curie Actions [655392]
- EP Abraham Cephalosporin-Oxford Graduate Scholarship
- BBSRC
- NIH [R01HD038921, R15HD080511]
- Marie Curie Actions (MSCA) [655392] Funding Source: Marie Curie Actions (MSCA)
- BBSRC [BB/K014544/1] Funding Source: UKRI
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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, be-tween 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 trade-offs, it remains unclear whether systemic lifespan-extending inter-ventions could ameliorate the declining performance of the ejacu-late as a whole. Here, we address these problems using Drosophila melanogaster. We demonstrate that seminal fluid deterioration con-tributes to male reproductive decline via mating-dependent mech-anisms 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 reproduc-tive 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 re-sults in improved late-life ejaculate performance, indicating simul-taneous amelioration of both somatic and reproductive aging.
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