Articles tagged with Sperm
Research reveals that male houbara bustards who perform the most elaborate sexual displays suffer from premature biological aging. This study finds that these males pass their reproductive prime earlier than less extravagant rivals, highlighting an early-life cost to later-life declines.
Scientists have successfully turned mouse embryonic stem cells into healthy sperm by coaxing them into primordial germ cells. This breakthrough allows for the potential creation of fertile offspring using induced pluripotent stem cells from adult skin cells.
Researchers studied interactions between individual sperm and eggs in red abalone, making precise chemical measurements and physical models of these interactions. They found that the egg releases a plume of tryptophan to attract sperm, greatly increasing its target area. Ocean flow conditions also play a significant role in fertilization.
A study by UC Davis researchers found that a significant proportion of men carry defective genes for the sperm coat protein DEFB126, which may significantly affect their fertility. The protein plays a crucial role in allowing sperm to swim through mucus and avoid the immune system.
Researchers found that generation time is a strong indicator of mutation rate, accounting for 40% of variation among species. Male mutation bias, where males have higher DNA mutations than females, was also linked to generation time. In contrast, metabolic rate appeared to be only a moderate predictor of mutation rates.
Researchers found that humans receive approximately 60 new mutations from their parents, with varying rates coming from the mother and father. The study provides a direct measure of new mutations and reveals surprising differences in mutation rates between families.
Research suggests that cell phone use can lead to increased testosterone levels but decreased fertility due to altered hormone balances.
Researchers at Dalhousie University have found that sperm whales use distinct codas to communicate, with different sounds indicating individual identity and social status. The study also highlights the impact of human pollution on whale communication, which is crucial for their survival in the deep ocean.
WSU researchers have confirmed a critical step in cell division that results in age-related miscarriages and birth defects, including Down syndrome. Egg cells failing to properly arrange chromosomes can lead to aneuploidy, or an abnormal number of chromosomes.
Researchers found that flying female fireflies receive nuptial gifts from their mates, whereas wingless females do not. This suggests that flightless females prioritize reproduction over male contributions.
Researchers discovered that lower SMAD3 levels result in faster maturation, while absent levels lead to abnormal responses to testosterone. This finding has implications for altered pubertal timing, affecting adult height and bone density.
A new study shows that a surgical technique called microdissection testicular sperm extraction (TESE) can effectively locate and extract viable sperm in over one-third of adult male childhood cancer survivors who were previously considered sterile. This technique enabled many men to father children with the help of in vitro fertilization.
A new study reveals semen quality has deteriorated significantly in Finland over the last decade, with total sperm counts decreasing from 227 million to 165 million. The incidence of testis cancer among younger men is also increasing, with a significant increase observed between those born in the late 1980s and earlier generations.
Researchers found that osteocalcin produced in bone enhances testosterone production in testes, supporting sperm survival. This discovery links the skeleton to male fertility and may provide insights into unexplained infertility cases.
Researchers successfully extended tomato shelf-life by introducing a polyamine-producing yeast gene, resulting in a delay of shriveling up to three weeks and a slower rate of decay. The study also showed increased levels of lycopene, a nutrient linked to cancer prevention.
Muscle cell fusion is a previously thought to be mutually consented event, but research reveals it's actually an invasive battle where one cell forces the other using finger-like projections.
A new study has identified DUO1, a genetic hierarchy that governs sperm cell production and fertility in flowering plants. The research found that DUO1 acts as a master switch to ensure twin fertile sperm cells are made in each pollen grain.
The ESHRE Task Force recommends evaluating IMAR requests based on four ethical principles: autonomy, beneficence, non-maleficence, and justice. The group acknowledges benefits of IMAR but emphasizes potential psychosocial risks and importance of informed consent.
A systematic review found that antioxidant supplements may benefit couples trying to conceive naturally, particularly when the male partner takes antioxidants. The review of 34 trials involving over 2,800 couples suggests a higher likelihood of pregnancy or live birth when antioxidants are used.
A new IVF prediction model developed by Scott Nelson and Debbie Lawlor uses data from 144,018 IVF cycles to provide a more accurate assessment of likely outcomes. The model identifies factors such as maternal age, duration of infertility, and oocyte use that affect the chances of successful treatment.
Researchers at Georgetown University successfully generated human-derived islet cells from spermatogonial stem cells, demonstrating their potential to counter diabetic hyperglycemia. The bioengineered cells secreted insulin and exhibited markers characteristic of normal islet cells.
Declining sperm counts and testosterone levels are contributing to reduced fertility rates worldwide. At least one in five young men in Europe have subfertile semen quality, while testicular cancer and developmental abnormalities also rise. Poor sperm quality is linked to poorer IVF success rates.
Researchers propose a novel approach to prevent both unintended pregnancies and HIV transmission by utilizing nanoparticles that carry melittin, a toxin derived from honeybee venom. The nanobees will target and destroy sperm and HIV cells through a fusion process.
A study found that only half of oncologists and haematologists agreed that sperm banking information is readily available to patients. Researchers are urging clinicians to discuss sperm banking with all male cancer patients to increase the opportunity for preservation.
A five-year study found that workers with high urine BPA levels had decreased sperm concentration, total sperm count, and vitality. The association between BPA exposure and poor semen quality strengthens evidence that BPA may have detrimental effects on the male reproductive system.
A four-year study found that endocrine-disrupting chemicals affect the ability of wild fish to breed, with intersex fish experiencing reduced reproductive performance. The research highlights the potential long-term impact of these chemicals on ecosystem health and human health.
The study reveals new insights into how the egg interacts with sperm at fertilization, providing potential clues to infertility and potentially leading to non-hormonal contraceptives. The research was conducted by Luca Jovine's team at Karolinska Institutet and has important implications for human reproductive medicine.
A team led by Judith Yanowitz has discovered a protein that plays a key role in choosing where genetic material gets swapped between maternal and paternal chromosomes during egg and sperm formation. This discovery sheds light on the roots of chromosomal errors and gene diversity, with potential implications for understanding infertility.
Researchers discovered a genetic alteration in the NR5A1 gene that disrupts sperm production, accounting for approximately 4% of cases of unexplained male infertility. The study suggests that these mutations may indicate mild abnormalities in testicular development, highlighting the need for further clinical investigation.
Two studies found that smoking during early pregnancy reduces germ cells and somatic cells in developing embryos, potentially influencing future fertility. This may contribute to the decline in fertility rates observed in recent years.
Researchers from Texas A&M University have developed protocols to isolate RNA from stallion sperm and testis biopsies, enabling the identification of genetic factors associated with subfertility. This breakthrough could lead to improved breeding procedures and enhance the reproductive potential of thoroughbred racehorses.
Using yeast as a model organism, researchers at Penn identified novel histone modifications key to gamete formation and potential biomarkers of human male infertility. The study reveals the importance of epigenetic processes in sperm formation, which may lead to fertility problems.
When faced with predator threats, snails settle for single parenthood sooner and adopt a different mating strategy. This approach reduces the risk of mortality and its negative effects on offspring survival rates. Research by biologist Josh Auld found that scared snails reproduce more quickly than calm counterparts.
A new recurrent translocation between chromosomes 8 and 22 has been found to cause a range of genetic diseases. The disorder, characterized by mild mental retardation and developmental delays, is thought to arise from palindromic sequences in the DNA that are prone to breakage and rearrangement.
Researchers from Northwestern University discovered a common human sperm gene called Boule, which is 600 million years old and shared among animals such as trout, sea anemone and flies. The gene plays a vital role in sperm production and has the potential to be targeted for male contraception and controlling diseases caused by parasites.
Research found that mothers who drank 4.5 or more drinks a week during pregnancy had sons with lower sperm concentrations, averaging around 25 million per milliliter. The study also discovered an association between prenatal alcohol exposure and semen volume and total sperm count.
A Purdue University researcher has identified a yeast gene that increases the production of a compound slowing aging and delaying microbial decay in tomatoes. This discovery may lead to extended shelf life for most fruits by an additional week, benefiting areas with limited access to fresh produce.
Scientists have found that plants deploy defensin proteins to facilitate the fertilization process, releasing male sperm cells through an explosive mechanism. This groundbreaking discovery provides new insights into the evolution of flowering plants and may lead to breakthroughs in breeding crops with improved fertility.
Researchers at Yale School of Medicine have developed a method to select sperm with the highest DNA integrity, comparable to the egg's natural selection abilities. The test identified a biochemical marker that allows clinicians to choose the best sperm for fertilization, improving male fertility rates.
Researchers at UT Southwestern Medical Center have developed a novel technique to produce genetically modified rats, offering potential for biomedical research on human diseases. The new method enables the creation of rat lines with mutations in specific genes, including those linked to cancer, diabetes, and mental illness.
Researchers found that folic acid promotes nerve cell regeneration in injured rodents through a molecular pathway. Additionally, two separate studies identified distinct roles for proteins PLA2s in male fertility and sperm function, suggesting potential targets for new contraceptive agents and treatments for infertility.
Researchers have identified two proteins, sPLA2-III and group X secreted PLA2 (mGX), as crucial for sperm function and fertility in mice. Mice lacking these proteins had decreased fertility due to impaired sperm maturation and fertilization efficiency.
Researchers found that rainfall affects sex ratios in African buffalo, with more males born during rainy seasons. The study suggests the presence of sex ratio genes influencing semen quality and female-biased sex ratios during dry periods.
UK researchers found that many urologists fail to diagnose and treat Chlamydia in young men, despite clear guidelines. In a survey of five teaching hospitals, only 7% of cases were tested for Chlamydia, and most received inadequate treatment.
A University of Illinois study found that a lack of omega-3 fatty acid is linked to male infertility. Sperm counts were extremely low and sperm shape was abnormal, but fertility was restored when DHA was introduced into the diet. The study suggests that omega-3 fatty acids may play an important role in male fertility.
Researchers discovered that leafcutter ant queens can neutralize male-male sperm competition through glandular secretions. This allows them to preserve their own sperm for millions of eggs fertilized over a single day's sexual activity.
Researchers genetically alter fruit flies to create fluorescent sperm, allowing them to observe in detail what happens to live sperm inside the female. The findings may have huge implications for understanding postcopulatory sexual selection and its role in evolutionary change.
Researchers at CSHL and Mexico's National Polytechnic Institute successfully inhibited asexual reproduction in a sexually reproducing plant by silencing transposons. This breakthrough could lead to the creation of genetically identical seeds with valuable parental traits, greatly increasing crop yields.
Scientists on a research vessel are trawling for prey of sperm whales in the northern Gulf of Mexico to gather data on their feeding ecology. The study will help conserve and protect these endangered large whales by understanding how they utilize their environment.
A study by the University of Exeter and Liverpool found that polyandry, where females have multiple mates, reduces the risk of populations becoming extinct. This is because all-female broods are less likely to occur due to the suppression of the SR chromosome, which can lead to population decline.
A recent study published in Human Reproduction found that women who conceive through IVF or ICSI have a significantly higher risk of stillbirth compared to those who conceive spontaneously. The study analyzed data from over 20,000 singleton pregnancies and found a four-fold increased risk of stillbirths among women who had IVF/ICSI.
Researchers have found a proton channel in sperm cells that allows them to rid themselves of excess protons when resting, enabling their movement in the female reproductive tract. This finding may lead to new ways of controlling male fertility and potentially even male contraception.
Researchers have identified a molecular regulator Hv1 that controls human sperm ability to fertilize eggs. Hv1 operates as a pore in the outer membrane of sperm cells, increasing internal pH levels. The findings provide new insights into male infertility treatment and marijuana's effect on sperm motility.
A new study published in the Journal of Heredity confirms that shark pups born to virgin mothers can survive for over five years. Genetic analysis by researchers at Stony Brook University and Queen's University found that some female sharks can produce viable offspring without male sperm, a phenomenon known as parthenogenesis.
Researchers found that mouse sperm from promiscuous species can discriminate between closely related and unrelated sperm, clustering together to swim faster. This cooperative behavior is driven by competition among males and may be widespread among 95% of mammals.
University of Florida urologists have developed a robot-assisted vasectomy reversal procedure that cuts average surgery time by 20 minutes, comparable to traditional microscope methods. The robotic procedure also shows quicker return of sperm count and improved efficiency.
A protein complex called elongator may play a significant role in erasing epigenetic instructions on sperm DNA, enabling the formation of new embryos. This discovery could have implications for stem cell research and cancer treatment.
Scientists have discovered a potential new way to combat malaria by disrupting the reproductive process of Anopheles gambiae mosquitoes. Removing or interfering with the 'mating plug' prevents successful reproduction and fertilization.
Researchers at Brown University have identified a cellular mechanism that enables cells to transform their state, which could lead to new insights into diseases. The study found that a regulatory protein removes a lid from genes, allowing the cell to change its identity.
A recent study published in Reproductive Biology and Endocrinology found that sperm from men with non-obstructive azoospermia are equally capable of producing embryos through intracytoplasmic sperm injection (ICSI). The study also showed that there were no significant differences in implantation rates or clinical pregnancy rates betwee...