Articles tagged with Sperm
Researchers discovered that male wasp spiders use a 'chastity belt' mechanism to block their female partner's sexual orifice during copulation, preventing offspring from other males. The detached genital tip plugs the orifice securely, impeding further copulation.
A new study published in International Braz J Urol found that exposure to hot baths or hot tubs can lead to male infertility. However, the effects can be reversible if the practice is discontinued for at least three months. The study showed a significant increase in sperm motility among responders, with a mean increase of 491 percent a...
A new study suggests that human males have evolved mechanisms to outcompete rivals for fertilization, even after sex. This phenomenon, dubbed 'sperm competition,' can lead to increased sperm count and more aggressive sexual behavior in response to perceived infidelity.
In promiscuous rodents, individual sperm work together in groups to increase competitiveness and successfully reach the female egg. This cooperation enables faster and stronger swimming, making them better competitors in fertilization races.
A survey of 129 men with testicular cancer found that 24% chose to bank their sperm before treatment, despite high costs and relatively low usage. Single men were twice as likely to bank their sperm, and those who did had better fertility outcomes after treatment.
A new protein called sperm flagellar energy carrier (SFEC) has been discovered in the sperm tail, which may play a role in disabling sperm swimming. The discovery is significant because SFEC is linked to glycolysis, a process that produces energy in the sperm's tail.
Researchers explore using tardigrade-produced trehalose to preserve human eggs, offering a potential solution to successful embryo cryopreservation. The method has shown promising results in mouse eggs, and further research aims to apply it to human eggs and endangered species.
Researchers identified a male-specific gene, PlestMID, in an oogamous green algae species that evolved from its isogamous ancestor's dominant sex. This breakthrough provides insights into the evolution of male-female dichotomy and the origin of distinct sperm and egg cells.
A study at the University at Buffalo found that synthetic cannabinoid AM-1346 can improve fertility in male smokers with poor semen quality, doubling fertilizing capacity. Researchers believe a communication imbalance between cannabinoid and cholinergic receptor systems may be responsible for nicotine-induced infertility.
A new study reveals that embolization, a minimally invasive treatment for varicoceles, significantly improves sperm motility and count in infertile men. Six months after treatment, 26% of couples achieved a pregnancy, with high sperm motility before the procedure being the key predictor of success.
Researchers have identified 381 proteins in the sperm of fruit flies, providing a new understanding of how sex evolved. This discovery could lead to breakthroughs in male infertility treatment.
A study by University of North Carolina researchers found that the protein CIB1 plays a critical role in proper sperm formation in mice. Mice missing both copies of the gene are infertile, while those with only one copy are fertile. This discovery sheds light on fertility genes and their potential impact on human infertility.
A recent study published in the Journal of Theoretical Biology reveals that the last male to mate with a female in polyandrous species has a higher chance of successful impregnation due to the presence of extra seminal fluid from previous partners.
The IVD is a long-term contraceptive designed as an alternative to vasectomy, blocking sperm by plugging the vas deferens. The new device aims to be more appealing than traditional methods, but reversibility studies in men are still unknown.
A study by McGill University Health Centre researchers finds that sperm banks are unpopular with patients due to lack of accurate information and improved doctor-patient communication. Quebecers are less likely to choose sperm banking than patients of immigrant descent.
Researchers at The Wistar Institute have identified a single molecule required for genome compaction in spores and sperm, a process critical for passing genetic information to offspring. Compaction helps protect the genome from damage and is essential for maintaining fertility in higher organisms.
Scientists have identified two genes that Wolbachia manipulates when infecting the fruit fly Drosophila simulans, shedding light on the genetic basis of Wolbachia infection. This discovery could lead to the development of genetically modified mosquitoes that can help control malaria transmission.
Researchers have successfully created sperm in a laboratory using embryonic stem cells, demonstrating their viability in producing viable offspring. The study opens up new avenues for investigating mechanisms involved in sperm production and developing new treatment strategies for infertility.
Scientists have successfully produced sperm from embryonic stem cells, paving the way for new treatments for male infertility. The breakthrough, led by Karim Nayernia at Newcastle University, used mice and produced seven babies, six of which lived to adulthood.
Scientists have discovered that sperm and male proteins trigger a cascade of gene activity in female fruit flies' reproductive tracts six hours after mating. This finding provides new insights into reproduction and could lead to innovative methods for controlling insect pests.
Men who undergo vasectomy reversal have a significantly higher rate of chromosomal abnormalities in their sperm compared to fertile men. The study found that the duration of obstruction and time interval after reversal are associated with increased abnormality rates, raising concerns about potential long-term effects on fertility.
Researchers discovered higher concentrations of nitric oxide in the seminal plasma of infertile patients compared to healthy men. High NO levels were correlated with greater sperm DNA damage, while low NO levels improved sperm motility.
A study led by Lawrence Livermore National Laboratory found a steady increase in sperm DNA fragmentation with increasing age of participants. Sperm motility showed a high correlation with DNA fragmentation, associated with increased risk of infertility.
Researchers tracked sperm whales using acoustic recording tags, finding that they produced 'buzzes' to locate cephalopods like squid during deep dives. This non-invasive method provides insight into the timing of prey detection and capture during dives.
A study found that severe congenital neutropenia, a genetic disorder, was transmitted through sperm donation in five children conceived via IVF or donor insemination. The authors conclude that potential mothers should be properly counseled and informed about the risks of genetic disorders transmission.
Researchers at Indiana University Bloomington found that even when ovary extracts are diluted 100,000 times, some sperm cells still respond to the scent. This discovery may help scientists understand problems with human conception and develop a diagnostic tool for male infertility.
A team of scientists has discovered the crucial role of phosphorylation and recombination in the step-wise loss of cohesins during meiosis. This process is essential for accurate chromosome segregation into separate cells. The findings provide significant insights into the intricate mechanisms governing cohesin function.
Researchers received FDA approval for a nonhormonal contraceptive device that blocks sperm in the vas deferens, aiming to provide a long-term and reversible method. The Intra Vas Device has shown effectiveness in preliminary studies, with men citing benefits such as avoiding hormonal side effects.
Researchers have found that hormonal male contraception can be fully reversible in just a few months, with all men regaining fertility. The study, which analyzed data from over 1,500 men, showed that sperm production can be fully inhibited by hormone treatment combinations, allowing for reliable contraception.
Researchers have successfully isolated and cultured sperm-producing stem cells from mouse testes, providing valuable insights into the development of a culture system for human spermatogenic stem cells. The study also reveals the importance of growth factors GDNF and FGF in enhancing cell growth and survival.
Researchers at Baylor College of Medicine have identified a new gene called DAF-36 that converts cholesterol into the active ligands for the DAF-12 nuclear receptor. These ligands promote C. elegans reproductive capacity and prevent dauer diapause, a long-lived larval phase.
Researchers have discovered that high carbon levels can inhibit the virulence of Pseudomonas aeruginosa, a dangerous human pathogen. This finding suggests that increasing local carbon availability could be an effective way to prevent infection.
A study found that only three-quarters of men attended their eight-week sperm test, highlighting a significant issue with post-vasectomy follow-up care. Despite counselling, many patients failed to return for additional tests, leading to concerns about the true vasectomy failure rate.
A team led by Dr Josephine Bowles and Professor Peter Koopman discovered that retinoic acid, a derivative of Vitamin A, triggers the beginning of meiosis in female embryos, resulting in egg production. In males, an enzyme suppresses meiosis until after birth, leading to sperm production.
A recent study found that 67% of teenage and young adult cancer patients successfully banked their sperm, despite initial obstacles such as anxiety and lack of knowledge. The researchers emphasized the importance of incorporating fertility preservation into treatment plans for these patients.
A new computational model developed by Dr. Moshe Wald helps physicians plan the best approach for IVF/ICSI treatments for couples. The model considers various factors, including a woman's age, man's infertility issues, and sperm retrieval methods.
Researchers discovered that protein translation takes place in sperm prior to fertilization, essential for sperm functions like motility and fertilization. Inhibiting mitochondrial translation machinery leads to decreased sperm motility and fertility rates.
A recent US survey of 1,197 people found that only 8% would use pre-implantation sex selection for non-medical reasons. Most respondents wanted an equal number of boys and girls or had no preference for the sex of their children.
Researchers have identified CatSper as a crucial channel facilitating calcium ion entry into sperm tails, enabling hyperactivation and motility. This breakthrough enables direct testing of modulators to block CatSper, potentially leading to the development of a male contraceptive.
A team of scientists has discovered that a protein called CatSper1 plays a crucial role in hyperactivation, the whiplike motion of sperm tails, and male fertility. The breakthrough uses patch clamp recording to study electrical currents inside sperm cells, opening new avenues for research into infertility and contraception.
Scientists use hydrophones to distinguish sounds made by different whale species, finding rare right whale sightings in the Gulf of Alaska and distinct 'dialects' among species. The study also reveals surprisingly robust populations of sperm whales during winter months.
The use of underwater listening devices has yielded surprising discoveries about the movements and calling behavior of endangered large whales in Alaskan waters. These devices have enabled scientists to detect and recognize whale calls over tens of miles, providing new insights into the seasonal habits of these marine mammals.
Researchers at Rutgers University have discovered two key fertility genes in the roundworm Caenorhabditis elegans, which are essential for successful fertilization. The study's findings have significant implications for understanding human infertility and may lead to new treatments.
Researchers have discovered a gene mutation in Bardet-Biedl syndrome that significantly increases disease severity. The finding mirrors the expected genetic complexity of common diseases like diabetes and cancer. By studying this mutation, scientists hope to uncover subtle genetic variants contributing to complex diseases.
Scientists at Max Planck Institute and University of Cologne isolate mutant Arabidopsis thaliana with single sperm cell, allowing it to germinate and fertilize. The researchers found that a positive signal from the egg cell's fertilization triggers endosperm proliferation.
Researchers at UT Southwestern have developed methods to keep sperm precursor cells from differentiating into sperm, allowing them to freeze and thaw the cells. This breakthrough could lead to alternative sources for embryonic stem cells and enable the development of new male contraceptives. The study's findings also pave the way for g...
The study reveals a sharp decline in sperm donor applications, with only 3.63% of applicants accepted as suitable donors. The researchers call for urgent action to attract more volunteers, particularly from older men and minority ethnic groups.
The HIRA gene plays a crucial role in re-packaging sperm DNA after fertilization, enabling it to engage with maternal DNA and form a new life. A mutation in this gene can prevent zygote formation, highlighting the importance of genetic processes in reproduction.
A study found that nearly two-thirds of heavy smokers' sperm failed a test measuring fertilizing capacity, with those who smoked more cigarettes per day showing lower fertility rates. The research suggests that heavy smoking overloads the nicotine receptor in human sperm and testes, leading to a decline in fertilizing potential.
A European study found that PCBs and DDT may damage sperm DNA, leading to higher levels of DNA fragmentation in men exposed to high levels of these pollutants. However, the researchers found no dramatic effects on human fertility and emphasized the need for further research.
Researchers found that microfluidics can successfully facilitate IVF in mice, with lower sperm concentrations required compared to traditional culture dishes. The technology has promising potential as a viable option for human IVF, potentially offering an alternative to ICSI.
Researchers found that hermaphroditic sea slugs can resolve mating conflicts by trading sperm with their mates. This behavior allows them to balance the costs and benefits of copulation between genders. The study provides new insights into the reproductive strategies of hermaphroditic animals.
Researchers have captured a molecular movie of the sperm's fusion with the egg's coating, revealing a tightly regulated process that enables fertilization. The study found that calcium release triggers membrane fusion, and loose SNARE formations precede the final tight configuration.
Researchers at Johns Hopkins University discovered that germ cells use the JAK/STAT pathway to receive signals regarding sexual identity. This understanding could lead to new treatments for human infertility and cancer.
A study found that damage to sperm DNA significantly increases with age, particularly in men over 45 years old, affecting their fertility potential. Researchers highlight the importance of assessing DNA damage in older men seeking fertility treatment.
Researchers have successfully derived human embryonic stem cells that can develop into primordial germ cells, which eventually form eggs and sperm. This breakthrough may help solve infertility issues and study the effects of environmental chemicals on reproductive development. Further work is needed to translate this promise into reality.
A new study reveals that transplantation of healthy germ cells can restore fertility in males who have undergone chemotherapy for childhood leukemia. Additionally, researchers identified a potential biomarker, claudin-1, which may be exploited to detect colon cancer progression and inform therapeutic strategies.
Researchers describe a method to distinguish and separate healthy sperm stem cells from leukemic cells in mice. The transplanted cells successfully colonized and produced healthy offspring, paving the way for the treatment of infertility caused by chemotherapy in childhood leukemia patients.
A comparative genetic study by Cornell University researchers found that some genetic mutations in human sperm cells may allow them to avoid early death and reproduce, but also increase the risk of cancer. The study suggests that these mutations could have led to a positive selection advantage, making humans more prone to cancer.
In some species, egg orientation influences embryonic development, leading to differences in cell fate and patterning. This phenomenon highlights the importance of spatial cues during early developmental stages.