Articles tagged with Sperm
Researchers identified a new genetic mutation that prevents sperm production in five men from a single Bedouin family. The mutation inactivates the function of the gene TDRD9, which normally protects full DNA sequence in sperm, leading to azoospermia.
Researchers at the Stowers Institute have solved the three-dimensional structure of the synaptonemal complex, a critical protein complex that ensures proper chromosome sorting during meiosis. The structure is composed of two railroad tracks stacked on top of each other, connecting homologous chromosomes and ensuring smooth cell division.
A comprehensive study reveals a 52.4% decline in sperm concentration and a 59.3% decline in total sperm count among Western men, highlighting impaired male health and decreasing fertility. The study suggests environmental and lifestyle influences may be contributing factors.
A new study reveals glutamate receptor-like proteins in plants control sperm navigation and fertilization, highlighting potential conserved functions between plant and human systems. The research suggests that these proteins may regulate cell-to-cell communication in sexual reproduction.
Researchers discover moss sperm uses glutamate receptors to navigate towards female organs, fertilize eggs and develop spores. The study also shows that glutamate receptors play a crucial role in controlling gene expression essential for spore development.
Researchers found that a mutation causing an inversion on the Z chromosome increases sperm velocity and morphology, leading to higher fertilization rates and reproductive success. This study provides insight into the evolutionary mechanisms underlying infertility in zebra finches.
A study of 224 Australian children aged between 5 and 11 found their psychosocial development, mental health, and well-being were comparable to those in the general Australian population. The study also revealed that mothers' physical and mental health appeared better than average.
Scientists found that selecting longer-lived sperm increases the survival prospects and quality of offspring. The study used zebrafish to demonstrate that this selection can also carry over to the next generation. Longer-lived sperm produced offspring with higher fitness, including increased survival rates and faster swimming speeds.
Researchers found that Ptbp2 regulates RNA processing during sperm development, controlling over 200 genes involved in movement and communication. Without the protein, sperm development went awry, leading to defects in cellular processes.
A new study of almost 19,000 IVF treatment cycles reveals that the age of the male partner significantly affects live birth success rate. The study found a decline in cumulative incidence of live birth with increasing male partner age, particularly among women aged 30-35 and those over 40.
Researchers found complex structures in male butterfly ejaculates and the adaptive responses in female reproductive tracts, shedding light on human infertility. The study's findings suggest that understanding these biochemical relationships could aid in unlocking mysteries of human reproduction.
Researchers discovered that semen amyloids help dispose of excess and defective sperm, facilitating immune cell removal and quality control. This process may favor the survival of fittest sperm and contribute to successful reproduction.
Researchers at Nagoya University identified a mosaic skin disease caused by sperm cell transmission of keratin mutation. The mutation was found to be identical in the affected daughter and her father, confirming germline transmission. Genetic counseling is crucial for predicting disease risk in future children.
Researchers have obtained the first 3D snapshots of a sperm protein attached to a complementary egg coat protein at the beginning of fertilization. The study reveals a common egg protein architecture involved in sperm recognition in both mollusc and mammal species.
Scientists have developed a non-destructive technique to examine human sperm using Magnetic Resonance Spectroscopy, which may improve diagnosis of fertility problems. The test can distinguish between good and poor sperm populations based on molecular composition differences.
Researchers have discovered two chemicals found in anti-fertility folk medicines that can block fertilization, potentially providing an effective alternative to hormone-based contraceptives. The chemicals, pristimerin and lupeol, work by stopping sperm's power kick, allowing for a new type of emergency contraceptive.
A new test evaluates sperm's capacitation ability, allowing for more accurate diagnoses of male infertility. The Cap-Score Sperm Function Test shows promise in increasing conception rates among men with unexplained infertility.
Researchers discovered that fats can tip the scales of fertility in roundworms by monitoring fatty acid levels using an enzyme called acyl-CoA synthase 4 (ACS-4). This phenomenon has implications for future studies into human fertility and reproductive development.
Researchers at Washington State University have made a breakthrough in preserving sperm stem cells, which could improve fertility for boys undergoing cancer treatment. The new technology has shown an eight-fold improvement in viable sperm stem cells, allowing for potential long-term preservation and return to fertility.
A study successfully reversed Vasalgel's contraceptive effect in rabbits after an injection of sodium bicarbonate dissolved the gel. Sperm concentration and motility returned to baseline levels, indicating a quick return of fertility.
Dynein motors are actively transported into cilia via the intraflagellar transport system and adaptor protein ODA16. The crystal structure of ODA16 shows how it recognizes dynein motors and binds the IFT complex, enabling their import into cilia.
A new smartphone-based device can analyze sperm concentration and motility with high accuracy, making it a game-changer for fertility care. The device has been tested with 350 clinical semen specimens and shows promise in detecting abnormal semen samples.
Scientists have developed a low-cost smartphone attachment for at-home fertility testing, enabling men to monitor their semen quality. The Fertilex platform can detect abnormal semen samples with over 95% accuracy, providing a reliable resource for the millions affected by male infertility.
Researchers developed a mathematical formula based on the rhythmic movement of a sperm's head and tail, reducing complexity in predicting sperm movement. The formula captures coordinated movements that create a jerky fluid flow, countering friction and ensuring selected sperm achieve forward propulsion.
Researchers found low sperm quality parameters linked to unhealthy diets rich in saturated fats and processed meat. Conversely, healthy foods like fish, fruits, and vegetables were positively associated with improved sperm quality.
Researchers have discovered a genetic mutation in the PLC-zeta protein that causes male infertility, but found that injecting more of this protein can restart fertilization. The study suggests that this form of infertility could be treated in the future.
New animal research suggests that consuming walnuts can improve sperm motility and morphology in mice, key predictors of male fertility. Walnuts are predominantly comprised of polyunsaturated fatty acids (PUFAs), which may be essential for sperm function.
A non-pharmaceutical agent called Vasalgel forms a hydrogel barrier to prevent sperm movement, providing long-term and reliable contraception. The study's findings suggest the method is safe and effective, with no conceptions occurring in test monkeys.
A new non-hormonal male contraceptive, Vasalgel, has been successfully tested in rhesus monkeys, showing no conception after injection and minimal complications. The study's findings suggest that Vasalgel could be a promising alternative to vasectomy for managing reproductive rates in captive populations.
Researchers have documented epigenetic changes in sperm of men who underwent chemotherapy in their teens, potentially affecting tissue health in subsequent generations. The study suggests that preserving sperm before undergoing chemotherapy may be necessary to mitigate these effects.
Researchers from Chinese Academy of Sciences found that BCAS2 plays a crucial role in alternative mRNA splicing during mouse spermatogenesis, leading to impaired meiosis initiation. The study provides evidence for the importance of alternative splicing machinery in regulating germ cell development.
Research has identified Ovo as a critical regulator of germline development in both mice and fruit flies, with the protein essential for the proper formation of eggs and sperm cells. This discovery suggests that Ovo acts as part of a conserved mechanism controlling reproductive cell development across different animal species.
Scientists have created male pigs that can produce sperm with the genetic blueprint of sought-after pigs by transplanting stem cells into surrogate animals. This breakthrough could dramatically improve pig farming efficiency and quality, as well as enhance desirable traits like disease resilience.
Researchers at Kyoto University found that the Myc gene regulates stem cell self-renewal in mice, leading to a slower rate of proliferation and impaired energy production. This discovery may lead to new treatments for infertility by stimulating sperm cell metabolism.
Researchers found that dominant Arctic char produce sperm swimming faster in diluted ovarian fluid, while subordinate males produce faster-swimming sperm in water. These adaptations may give them an edge in competition for mates.
A recent study found that sedentary men who exercise regularly for six months experience significant improvements in sperm count and quality. The researchers discovered that moderate-intensity continuous training (MICT) yielded the most pronounced benefits, with men experiencing increases in semen volume, sperm motility, morphology, an...
Scientists at Cornell University developed a system where enzymes are attached to nanoparticles to mimic the efficient energy-producing mechanism of sperm tails. The tethered enzyme system processes glucose to lactate more efficiently than free-floating enzymes, with potential applications in powering devices that carry out various jobs.
A study suggests that mandatory donor identification could reduce the number of donors by 30% and increase compensation demands by $60 per donation. This could have economic implications for the market, particularly with an already excess supply of donors.
Researchers found that Zika virus infection can severely damage the testes of male mice, causing shrinkage and reduced sperm count. The study suggests that this may have important implications for human males infected with the virus, highlighting the need for further research on reproductive health.
Researchers are developing a system using phase-contrast imaging and mathematical analysis to identify the best-fitting sperm, leading to improved fertility treatment decisions. This new approach aims to reduce distress and expense associated with infertility treatments like IVF.
A new study found that injectable contraceptives for men can reduce the risk of unplanned pregnancies in their female partners. The hormone-based method, which involves injecting a combination of progestogen and testosterone, was effective in nearly 96% of continuing users.
Researchers Srinivasan Vijayaraghavan and Doug Kline will study cellular mechanisms regulating sperm and egg formation, aiming to improve fertility treatments. They hope to understand protein interactions and cellular processes that make fertilization successful, leading to better outcomes for assisted reproductive programs.
Researchers discovered a network of proteins often linked to cancer plays a crucial role in male fertility and the birth of healthy offspring. The study, published in Cell Reports, sheds light on the precise epigenetic regulation of sex chromosomes and their impact on germline cells that produce male sperm.
Researchers have developed a method to quantify semen activity based on its spinning motion, providing an objective ranking for artificial insemination. The technique measures the collective rotation of sperm in a semen drop, which is faster and more reliable than current subjective rankings.
A new study from the University of Nebraska-Lincoln found that male dark fishing spiders' self-sacrifice after mating benefits their offspring, producing nearly twice as many spiderlings and those growing up to 20% larger. The females who consumed their mates survived about 50% longer than those without this behavior.
The study found that ICSI men had almost half the sperm concentration and a two-fold lower total sperm count compared to naturally conceived men. They were also nearly three times more likely to have sperm concentrations below 15 million per millilitre of semen.
Researchers found that administering spermidine can prevent age-induced memory impairment by stopping synapses from narrowing their operational space. This study provides a new lead for treating age-associated dementia.
Researchers have successfully created healthy baby mice by injecting sperm into embryos developed from non-egg cells, achieving a success rate of up to 24 per cent. This breakthrough challenges the long-held dogma that only egg cells can support embryonic development.
A team of biologists has identified a cannabinoid receptor, GPR18, in spermatozoa that plays a crucial role in the acrosome reaction and fertilization process. The receptor is sensitive to NAGly and THC, and its activation triggers the acrosome reaction.
A new study shows that climate change impacts seawater chemistry, reducing sperm performance in sea urchins and changing the rules of sperm competition. This could affect the outcome when rival males compete to fertilize eggs, impacting marine species survival.
Researchers have discovered that female ocellated wrasses prefer sperm from nesting males over sneaker males, even when fertilization occurs externally. This phenomenon, known as cryptic female choice, is driven by the ovarian fluid released during spawning, which enhances sperm velocity and attraction to the egg.
A study of stud dogs over 26 years found a significant decline in sperm quality, with chemicals in dog food and testes contributing to the issue. This may offer insight into human semen quality decline, as dogs share similar environments and exhibit similar responses to therapies.
A Japanese research group has determined the crystal structure of the JUNO protein, an essential egg surface protein for fertilization. The study found that a specific amino acid residue, W62, is critical for sperm-egg interaction, providing new insights into the fertilization mechanism.
Researchers at TU Munich and Weizmann Institute successfully recreated DNA condensation on a biochip, replicating the tightly packed structure found in cell nuclei and viruses. This breakthrough enables better understanding of biological processes and potential applications in artificial cells.
Kiel researchers found that the stiffness of a male beetle's penis is crucial for successful mating, as the female's spiral-shaped reproductive organ makes penetration difficult. The study suggests that males with softer tips may have an advantage in mating.
A QUT study of over 1000 Australian women found younger and more educated sperm donors are preferred, despite women having more freedom to choose. This suggests that resources and financial stability remain important considerations in reproductive decisions.
Researchers discovered that sperm whales use distinct tapping sounds to convey individual messages, similar to Morse code, allowing them to identify themselves and coordinate actions. The most communicative whale accounted for 294 of the recorded codas, sparking interest in learning more about its unique behavior.
A University of Miami research team created a mathematical model to investigate the role of sexual transmission in the spread and control of Zika. The study found that mosquito control remains the most important mitigation method, but sexual transmission increases the risk of infection and prolongs outbreaks.
A new study reveals that paternal mitochondria are degraded in early stages of development, reducing the risk of embryo lethality. The cps-6 gene plays a key role in initiating this self-destruction process, which may be an evolutionary advantage for the embryo.
A recent study published in BJU International found that smoking can cause DNA damage in sperm, leading to decreased fertility. The research included 20 non-smokers and 20 smokers and analyzed protein alterations in their sperm. Sperm with altered DNA may lead to health problems in offspring.