Articles tagged with Reproductive Biology
A study found that acute stress has a sudden and dramatic effect on the fertility of male big brown bats during breeding season, with testosterone levels plummeting by ~50% and sperm production reduced. The team also discovered that stressed bats released more of a key hormone that can reduce fertility and ability to reproduce.
A US study found that increasing nest temperatures affects leatherback hatchling morphology, performance and hatching success. Mid-season nests had the highest hatching success and better physical performance.
Researchers at Texas A&M University have developed an isochoric vitrification technique that preserves and revives live coral fragments without forming ice. This breakthrough enables the collection of coral samples throughout the year, supporting conservation efforts to protect reefs and their diverse ecosystems.
Researchers propose a novel theory of aging that suggests cell competition is a key factor in the process. The selective destruction theory (SDT) proposes a mechanism of aging that is independent of accumulating damage and consistent with epigenetic rejuvenation.
The study found that the Golgi apparatus plays a crucial role in initiating dendritic refinement through neuronal activity, particularly with the NMDAR receptor. The researchers observed changes in Golgi polarity and dendrite shape when NMDAR signal or Golgi polarity was interrupted.
Researchers have identified a genetic cause for virgin birth in female flies, allowing them to reproduce without males. The ability is passed down through generations of females and can be induced in an animal that usually reproduces sexually.
A soil nematode was reanimated from 46,000-year-old Siberian permafrost, shedding light on its ability to survive harsh conditions. The species, Panagrolaimus kolymaensis, shares molecular tools for survival with C. elegans.
A new study led by UCL researchers found that Caenorhabditis elegans' lifespan is limited by its reproductive self-destruction. The finding raises questions about the validity of insights from this model organism for human ageing advances.
A study investigates the impact of industrial sludge on zebrafish development, revealing concentration-dependent mortality, decreased hatchability, and disrupted thyroid hormone levels. The findings highlight the need for biomonitoring endpoints to predict and assess PAH pollution in Bohai Bay.
Researchers developed a noninvasive diagnostic test to identify intact sperm in infertile men with nonobstructive azoospermia. The test uses protein biomarkers AKAP4 and ASPX to visualize well-developed sperm, potentially increasing success rates for surgical sperm extraction. This breakthrough may lead to new male birth control drugs ...
A study published in PLOS Biology found that polar fish reproduce later and produce more eggs than tropical fish, confirming model predictions. As a result, polar fishes tend to produce more eggs than tropical fishes.
A study found similar birth outcomes for same-sex lesbian couples undergoing ART compared to heterosexual couples who conceived naturally or through ART. Infertility-related factors, not reproductive treatments, contribute to higher adverse birth outcomes in ART pregnancies.
Researchers at Cornell University have discovered that female giant African pouched rats can undergo 'unusual' reproductive organ transformations. The study, published in Current Biology, explores how traits once considered fixed in adult animals may become variable under specific pressures.
A novel sperm sex selection technique has been found to be around 80% effective in producing offspring of the desired sex. The new method is considered safe and its efficacy was determined through a small clinical trial.
Researchers identify egg yolk proteins retained in viviparous sharks and rays, which may provide nutrition to developing embryos. The study suggests that these proteins have evolved a new function in cartilaginous fishes, potentially facilitating the transition from egg-laying to live birth.
Researchers at the University of California - Riverside have discovered a way to deactivate mosquito sperm, preventing them from swimming to or fertilizing eggs. This breakthrough could help control populations of Culex mosquitoes that transmit infectious diseases like encephalitis and West Nile Virus.
Researchers from Kumamoto University found that synchronizing ovulation and mating in
A recent study published in PNAS reveals that the protein TSKS plays a crucial role in eliminating sperm cytoplasm, enabling a streamlined structure necessary for successful fertilization. The findings suggest potential applications for diagnostic tests and male contraceptives.
Scientists have successfully transformed blood cells into sperm precursors in marmoset embryos using a step-by-step process. The study, published in eLife, opens up new avenues for studying primate biology and developing novel assisted reproductive technologies.
A new study found that killer whale mothers pay a high price for raising their sons, with each living son cutting their annual breeding likelihood in half. This lifelong burden on mothers has significant implications for the future viability of the southern resident killer whale population, which is critically endangered.
A recent study published in Zoo Biology found that flamingo flocks should be between 50-100 individuals to encourage successful reproduction and sustain populations. Adding new individuals can increase reproductive success, while climatic variables play a limited role.
A team of scientists found evidence that 37 ichthyosaurs died in the same location, suggesting they were migrating to give birth over hundreds of thousands of years. Geochemical tests revealed no signs of environmental disturbance or mass stranding events, pointing to a more plausible explanation for their demise.
Researchers found that IGF1 gene therapy increases kisspeptin expression and GnRH release, and alters microglial cell numbers, suggesting a potential protective effect against reproductive decline. This could lead to new strategies for optimizing lifespan and combating age-related health problems in women.
A research team led by the IPK Leibniz Institute has identified a new resistance mechanism for winter barley against two major viruses, BaYMV and BaMMV. By targeting the PDIL5-1 gene using Cas9 gene scissors, the researchers were able to establish novel resistances in barley varieties.
A review article by Osaka Metropolitan University researcher Professor Noritoshi Kawate explores the use of INSL3 as a hormone indicating gonadal functions in domestic animals. The study reveals that INSL3 secretions in bulls and male goats are stimulated by luteinizing hormone, making it a reliable fertility indicator.
A new method of conventional IVF has been successfully developed by Katrin Hinrichs and colleagues, resulting in three healthy foals born to recipient mares. The technique offers a simplified alternative to existing methods like ICSI, which require expensive equipment and training.
Queen ants live much longer than workers by generating an anti-insulin protein that blocks aging pathways. This protein enables pseudoqueens, female worker ants that become queens, to reproduce and live longer without aging.
A new study reveals that ant queens implement a dual-control system for insulin to promote egg development while slowing down the aging process. This unique mechanism allows ants to live longer and reproduce more effectively, unlike other animals.
Researchers at the University of Cambridge have successfully grown a model embryo with a brain, beating heart, and all other organs using mouse stem cells. This breakthrough could help understand why some pregnancies fail and develop a new approach for repairing synthetic human organs.
A study found that bird photography decreases nest predation and boosts nestling survival in tropical forests. Researchers discovered a significant reduction in predation rate among photographed nests, with little effect on feeding rates.
A new study published in Ecological Applications found that urban density has a stronger correlation with house sparrow health than other environmental factors like light pollution or noise levels. The researchers also discovered high lead levels in the birds' bodies, which could be linked to bioaccumulation from food sources.
Researchers developed live-cell imaging to study chromosome segregation errors and their impact on embryonic development. They found that micronucleus formation during early cleavage division is a potential hallmark of preimplantation embryonic loss in cattle.
Researchers analyzed DNA of Demodex folliculorum mites living in human hair follicles, finding unusual body features and behaviors due to their isolated existence. The study suggests these mites may transition from external parasites to internal symbionts as they shed unnecessary genes and cells.
A new diagnostic marker has been identified that predicts successful and efficient oocyte development. The study found that X-chromosome inactivation and reactivation are critical for normal germ cell differentiation.
Researchers found that human embryos express a vast variety of alternative mRNAs when they are just 8 cells old, leading to a temporary collapse of splicing regulation at the zygotic genome activation stage. This phenomenon is developmentally programmed and occurs because it is necessary for functional reasons, ultimately affecting DNA...
A study published in PLOS Medicine found that certain reproductive events, such as shorter estrogen exposure, may be associated with increased dementia risk in women. However, the association between the number of children and dementia risk was similar for women and men, suggesting social and behavioral factors may play a role.
A recent study led by the University of Zurich found that well-integrated male dolphins with strong social bonds to many alliance partners produce the most offspring. The researchers analyzed 30 years of behavioral data from 85 male dolphins and used genetic data to conduct paternity analyses for more than 400 dolphins.
Adults conceived via IVF show improved social relationships and environment quality of life, according to a new study. The research also found associations between positive psychosocial factors, such as family financial situation and relationship with parents, on adult quality of life.
Scientists have identified three active compounds in sex pheromones of the world's largest hornet, Vespa mandarinia, to attract males and control its reproduction. The discovery could aid in monitoring and controlling the invasive species' spread in North America.
Aging egg cells accumulate damage to genetic material, preventing maturation and fertilization. Researchers have identified a key process causing this damage and found that anti-viral drugs can reverse it.
Researchers find that nearly 20% of sperm proteins are replaced by female-derived proteins after mating, supporting sperm viability during prolonged periods before fertilization. This 'hand-off' reveals that sperm are materially the product of both sexes.
Researchers used an ancient fish, elephant sharks, to gain insights into human biology and how a widely used medication works. The findings show that progesterone receptor activation in humans requires a different mix of hormones and steroids than in elephants sharks, with the latter not inhibited by RU486.
A research team discovered that human eggs are missing the protein KIFC1, which acts as a molecular motor to stabilize spindle poles during cell division. This finding opens up new avenues for therapeutic approaches to reduce chromosome segregation errors in human eggs.
A new 9-step blueprint has been developed to improve the use of genetics and breeding strategies in aquaculture species, aiming to strengthen food security and meet growing global demand for fish. The guidelines also aim to address concerns over fish stocks, mercury levels, and farmed fish nutritional value.
Research confirms that fish become sexually active and spawn due to growth-induced respiratory stress. The study found a consistent metabolic ratio across 133 species of fish, which supports the idea that reproduction is initiated by changes in oxygen supply and demand.
Researchers at the University of Vermont have created the first living robots capable of reproducing, using AI-designed Xenobots. This groundbreaking achievement has significant implications for regenerative medicine, as it demonstrates a new form of biological self-replication.
A Brazilian study expands amphibians' known reproductive modes to 74, creating a new classification. The research analyzed 2,171 species of amphibians, including anurans with 71 reproductive modes, some laying eggs in aquatic environments while others develop directly.
Researchers identify key neurons and signaling pathway regulating female activity before ovulation. Discoveries could lead to new treatments for menopause that sidestep estrogen and reactivates the circuit with CRISPRa technology.
Scientists from the University of Tsukuba have developed a new technique to preserve Drosophila primordial germ cells, which can be used to produce new offspring. The cryopreserved PGCs were found to be effective after up to 400 days of long-term storage.
A study of roundworms found that older parents can produce larger, faster-developing offspring with better reproductive success, challenging the notion that old parental age is detrimental. The research showed that older parents invest more nutrients in eggs, resulting in larger offspring.
A study by Johannes Gutenberg University Mainz found that genetically diverse ant colonies produce more larvae than those with similar genetic backgrounds. This improved division of labor allows for more efficient task allocation, leading to better colony performance.
Researchers from Osaka University identified SPATA33 as a key regulator of sperm motility, which will aid in developing fast-acting male contraceptives. The study also clarified the mechanism by which SPATA33 controls sperm motility, shedding light on the cause of male infertility.
A team of researchers at University of California San Diego School of Medicine discovered that GIV/Girdin plays a critical role in sperm motility, survival, and fertilization success. The protein regulates capacitation and acrosome reaction processes, essential for successful fertilization.
A new ultrasonic method improves fetal weight prediction accuracy by analyzing three-dimensional limb volumes and abdominal circumferences. The algorithm outperforms traditional formulas in predicting macrosomia and birth weights.
Research from the University of Alberta found that female squirrels who predict abundant food years have more pups that survive to maturity. This is due to their ability to recognize mast seeding years, which occur once in a few years and provide an abundance of food.
Researchers have discovered the first occurrence of in situ preserved trilobite eggs from the Lorraine Group in upstate New York. The eggs are spherical to elliptical in shape and nearly 200 micrometers in size, providing valuable insights into the reproductive biology of ancient arthropods.
A team of scientists from Australia and Panama examined the reproductive mechanisms of Saccharum spontaneum to develop better management strategies. The study found that cutting stems into smaller pieces can help prevent flowering and seed dispersal, while timing management actions during specific seasons can also be effective.
A recent study on African bird fauna found that large-scale patterns of species richness and endemism are robust to changes in species concepts. The analysis identified complexity within long-recognized centers of endemism, with certain areas acting as 'species pumps'.
Biologists at UCSD discover how to genetically convert leaves into petals, a process made possible by the expression of five genes in leaves. The achievement has significant implications for plant development and could lead to the creation of novel plants with colorful, petal-like structures.
Researchers discover a ring species of greenish warblers with gradually changing behavioral and genetic characteristics encircling the Tibetan Plateau. The study reveals how small evolutionary changes can lead to reproductive isolation between species.