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Author Spotlight: Exploring the Long-Term Health Impacts of Intracytoplasmic Sperm Injection on Offspring
Published on: May 17, 2024
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Selection for longer lived sperm within ejaculate reduces reproductive ageing in offspring
Ghazal Alavioon1, Andrea Cabrera Garcia1, Magali LeChatelier1
1Department of Ecology and Genetics, Evolutionary Biology Centre Uppsala University Norbyvägen 18D 75 236 Uppsala Sweden.
Evolution Letters
|July 11, 2019
Summary
Sperm selection for longevity in zebrafish improves offspring survival and fecundity, reducing age-related decline. This suggests sperm variation impacts animal life histories and has implications for assisted reproduction technologies.
Area of Science:
- Reproductive Biology
- Evolutionary Biology
- Animal Behavior
Background:
- Sperm production vastly exceeds egg availability, leading to sperm competition.
- Phenotypic and genotypic variations among sperm influence offspring fitness.
- Previous studies linked sperm selection for longevity to enhanced early-life offspring performance.
Purpose of the Study:
- To test if within-ejaculate sperm selection for longevity impacts offspring life-history traits, specifically early-life fitness versus accelerated aging.
- To investigate the effects of sperm selection on age-specific reproductive performance and senescence in both male and female zebrafish.
- To determine the implications of sperm selection for reproductive aging and potential applications in assisted fertilization.
Main Methods:
- Experimental setup using zebrafish (Danio rerio).
- Within-ejaculate sperm selection for sperm longevity.
- Assessment of offspring fecundity, survival, and fertilization success across age groups.
- Comparison of offspring from selected sperm versus unselected sperm.
Main Results:
- Sperm selection for longevity reduced age-specific deterioration in male fecundity and offspring survival.
- Selection for sperm longevity improved early-life female performance, followed by a slower decline compared to unselected sperm.
- Selection for sperm longevity reduced age-specific decline in female fertilization success.
Conclusions:
- Within-ejaculate sperm variation influences individual life histories in both sexes.
- Sperm selection for longevity can mitigate reproductive aging in offspring.
- Findings have implications for assisted fertilization programs in livestock and humans.
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