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Cosmic parenthood in doubt as space-like microgravity halves sperm navigation
science14 days ago

Cosmic parenthood in doubt as space-like microgravity halves sperm navigation

New microgravity experiments using a tiny obstacle course showed human and mouse sperm navigated about 50% less effectively in space-like conditions, resulting in roughly a 30% drop in fertilization. While some sperm still reach the egg and may form higher-quality embryos, embryo development in weightlessness could pose major challenges, suggesting space reproduction may be possible only for the fittest sperm and with careful embryo protection as NASA pursues Moon and Mars settlements.

via Yahoo|
#embryo-development#microgravity#reproduction
Space Sperm Need Gravity to Find Their Way
science14 days ago

Space Sperm Need Gravity to Find Their Way

Adelaide University researchers tested human, mouse, and pig sperm in a device simulating microgravity, finding that sperm struggled to navigate a maze mimicking the female reproductive tract and showing about a 30% reduction in successful navigation under zero gravity, underscoring gravity as a key factor in early reproductive success during space conditions.

via OutKick|
#reproduction#science#space-travel
Frequent Ejaculation Linked to Healthier Sperm, Review Finds
health15 days ago

Frequent Ejaculation Linked to Healthier Sperm, Review Finds

A review of nearly 150 studies finds that regular ejaculation or sex can help sperm quality, while abstinence modestly degrades it via increased oxidative stress and DNA damage, reducing viability and motility in humans and other animals. A recent IVF trial suggested higher fertilization success when men ejaculate within 48 hours of sample collection, though the impact on natural fertility remains unclear. The findings could lead clinics to reassess abstinence guidelines and emphasize sperm quality alongside quantity, while general health benefits of regular sexual activity appear unaffected.

via gizmodo.com|
#abstinence#fertility#health
Sperm Lose Direction in Microgravity, Raising Spaceflight Reproduction Concerns
science15 days ago

Sperm Lose Direction in Microgravity, Raising Spaceflight Reproduction Concerns

Researchers used a 3D clinostat to simulate microgravity and tested human, pig, and mouse sperm in a channel resembling the female reproductive tract; they found a significant drop in the number of sperm reaching the egg under microgravity, not due to motor changes but impaired direction sensing; fertilization dropped about 30% after four hours of exposure, with longer exposure causing delays and fewer embryos; progesterone could still guide sperm, indicating chemotaxis remains important; the findings, published in Communications Biology, imply spaceflight could affect reproductive outcomes in humans and livestock, highlighting the need for further research.

via ScienceAlert|
#fertilization#microgravity#reproduction
Sperm Lose Direction in Microgravity, Prompting Space Reproduction Research
space16 days ago

Sperm Lose Direction in Microgravity, Prompting Space Reproduction Research

Australian researchers used a clinostat to simulate microgravity and found human, mouse, and pig sperm become disoriented, with about a 40% drop in those reaching a simulated egg; microgravity also affected early embryo development in animals, though healthy embryos could form, and progesterone helped guide sperm. The findings underscore the importance of understanding reproduction in space for future Moon/Mars settlements and ongoing space biology programs, while noting radiation and ethical considerations remain challenges.

via The Guardian|
#adelaide-university#microgravity#reproduction
Frequent ejaculation linked to a small fertility boost, study finds
health16 days ago

Frequent ejaculation linked to a small fertility boost, study finds

A large meta-analysis across human and non-human studies shows that regular ejaculation helps prevent rapid deterioration of stored sperm, with longer abstinence associated with increased DNA damage and reduced motility. The findings suggest a modest fertility benefit from frequent ejaculation and hint that ejaculation timing could influence IVF success; current guidelines allowing up to seven days between samples may warrant revision.

via Euronews.com|
#ejaculation#fertility#health
Sperm RNA Clock Reveals Mid-Life Aging Cliff Linked to Child Health
science2 months ago

Sperm RNA Clock Reveals Mid-Life Aging Cliff Linked to Child Health

A new EMBO Journal study reports a mid-life, abrupt shift in sperm RNA—an “aging cliff”—that could influence what fathers pass to their offspring, offering a mechanism beyond DNA mutations that may help explain increased risks of neurodevelopmental and metabolic issues in children of older dads and supporting aging-related cautions in assisted reproduction.

via ZME Science|
#aging#neurodevelopment#paternalage
Age-Related Increase in Genetic Mutations in Men's Sperm
science5 months ago

Age-Related Increase in Genetic Mutations in Men's Sperm

A study shows that sperm from older men carry more genetic mutations, including potentially harmful ones, which increases the risk of genetic diseases in offspring. The research highlights that mutations accumulate with age and are subject to positive selection, raising concerns about reproductive planning and genetic counseling for older fathers.

via WIRED|
#genetic-mutations#genetic-risk#mutation-accumulation
Older Men's Sperm Have More Mutations, Potentially Harmful
science5 months ago

Older Men's Sperm Have More Mutations, Potentially Harmful

Research shows that as men age, their sperm accumulate more mutations, some of which are harmful and linked to developmental disorders and cancers, increasing the potential health risks for their children. The study highlights the role of 'selfish' mutations that outcompete others in the testes, with mutation rates rising from 2% in men in their 30s to about 4.5% in men over 70, though not all mutations are necessarily passed on or harmful. Further research is needed to understand the full impact on offspring health.

via ScienceAlert|
#aging#disease-risk#genetics