Articles tagged with Sperm
A new study published in the Royal Society journal found that managing GM herbicide tolerant sugar beet crops can increase yields while reducing herbicide use. The research also shows that single glyphosate applications can enhance weed seed production, benefiting wildlife.
Scientists have successfully germline-modified mice using stem cells, paving the way for experimental analyses. Researchers also shed light on the effects of osmolarity and glucose/phosphate levels on embryo development.
Research found lesions on sperm whale bones increase with age and size, suggesting chronic decompression damage. Nitrogen gas bubbles from sonar or seismic survey guns may cause acute problems in whales.
Researchers at Brown University have identified an enzyme called Udx1 that generates hydrogen peroxide to block sperm entry and protect the fragile embryo. The discovery sheds light on a century-old mystery of how eggs defend themselves against sperm, with potential implications for understanding fertilization and early development.
Researchers found that sperm motility and ATP production depend on a metabolic pathway called glycolysis, which uses sugar to produce energy. Without the enzyme glyceraldehyde 3-phosphate dehydrogenase-S (GAPDS), sperm movement is severely impaired, making it a potential target for non-hormonal male contraceptives.
A study of 29 adolescents who had been conceived through 'open-identity' sperm donors found that all but one young person had a neutral or positive response to their origins. The majority expressed curiosity about their donor and sought a connection, not a paternal relationship. This finding contradicts stereotypes and suggests that op...
Researchers at the University of Pennsylvania School of Veterinary Medicine have identified key growth factors essential for sustaining spermatogonial stem cells in culture. By understanding these factors, scientists hope to develop new fertility therapies and create sperm in vitro.
Scientists have successfully grown sperm progenitor cells in a laboratory culture, paving the way for potential new treatments for male infertility. The breakthrough, led by Hiroshi Kubota, could also enable the creation of genetically modified animals and extend the reproductive life of endangered species.
Research reveals that human olfactory receptor hOR17-4 is expressed on both human sperm cells and olfactory neurons, suggesting a dual capacity for chemosensory functions. This discovery has implications for understanding fertility defects associated with olfactory receptor-dependent chemotaxis in sperm.
Sea urchin research sheds light on fertilization among mammals, revealing a key role for carbohydrate molecules in regulating reproduction. The discovery could lead to new approaches to contraception and a better understanding of human reproductive issues.
A jumping gene called mUtp14b has been found to affect fertility in mice, with a mutation leading to sterility. Researchers believe this gene may play a role in male infertility in humans and are investigating its potential impact.
Researchers have found that compounds in khat plant leaves, specifically cathinone and norephedrine, stimulate final stages of sperm maturation and prevent premature acrosome reactions. This study may lead to the development of over-the-counter fertility products.
The use of artificial reproduction technologies in wildlife conservation aims to understand fundamental reproductive mechanisms in various species. Dr. David Wildt highlights the importance of collaboration between specialists from different disciplines to achieve genuine conservation.
A team of Japanese researchers has developed a novel method for introducing transgenes into animals by injecting retroviruses into immature male mouse testes. The technique resulted in high fertility rates and stable transgene transmission, enabling the production of genetically modified offspring from a single founder male.
In Volvox carteri, colonies become sexual when exposed to high temperatures, releasing pheromones to guarantee mating partners. This response is linked to the activation of the sex-inducer gene, which promotes the production of a pheromone in reaction to increased oxidants produced by free radicals.
A healthy baby boy was born to a couple after the father's sperm was successfully frozen for 21 years. ICSI technique used for fertilization, resulting in high motile sperm percentage after thawing. Long-term storage preserved fertility quality, offering hope for young cancer patients seeking family planning.
A team of researchers from the University of Washington has identified a gene, ZFP145, that is linked to sperm-producing stem cells in mammals. The study found that this gene plays a crucial role in the decision-making process of these cells, and its mutation can lead to infertility.
Research finds a correlation between disrupted spermatogenesis and abnormal genomic imprinting in men with low sperm counts. The study suggests that spermatozoa from oligozoospermic patients carry an increased risk of transmitting imprinting errors.
Scientists at Johns Hopkins Medicine have discovered that lost sperm-making stem cells in fruit flies can be replaced by reversing their specialized state. The team found that temperature changes can trigger a process called dedifferentiation, where more specialized cells retrace the path taken by stem cells.
Researchers at Mayo Clinic found that frozen sperm are just as effective as fresh sperm in in vitro fertilization. The cumulative live birth rate was higher for frozen sperm, with a success rate of 53.1 percent compared to 51.6 percent for fresh sperm.
A new protein, DEFB118, has been discovered in the male reproductive tract and has potent antibacterial activity. It may aid fertilization by protecting sperm from harmful organisms encountered in the female reproductive tract.
Researchers successfully fertilized rabbit oocytes with freeze-dried sperm, showing promise for long-term storage. The breakthrough improves upon previous success with mouse sperm and opens up possibilities for preserving sperm from humans and other mammalian species.
Scientists have successfully grafted primate testes into mice, resulting in the rapid production of fertile sperm. This breakthrough could preserve genetic material from endangered nonhuman primates and offer reproductive options to men rendered infertile by cancer treatments.
Researchers have successfully produced transgenic zebrafish using cultured sperm cells grown in laboratory conditions, enabling the study of human development and disease. The new technique also holds promise for pre-fertilization strategies in human gene therapy, potentially leading to preventive treatment for certain genetic disorders.
A team of biologists at UC Berkeley has found a key gene involved in the first step of meiosis, allowing chromosomes to recognize and pair with their homologs. This discovery is crucial for understanding meiosis in humans and could lead to insights into infertility and genetic diseases.
Researchers found that multiple caspases and regulators are required for proper sperm formation in fruitflies, highlighting a non-apoptotic process. This discovery could provide insights into male infertility and suggest possible treatments.
Scientists have successfully engineered mouse embryonic stem cells into sperm-like cells using laboratory techniques alone. These precursors were then used to fertilize mouse eggs, resulting in the formation of early-stage embryos. The research has potential applications for treating male infertility and studying cancer.
Researchers identified a gene that plays a critical role in sperm cell hyperactivation, which is essential for fertilization. Disrupting this protein could render sperm cells ineffective or infertile, leading to a new type of fast-acting and low-side-effect contraceptive.
Temple researchers mapped out early embryo development and found that clones replicate the process entirely at this stage. However, cloned embryos bear characteristics of both an embryo and adult cell, leading to slow and incomplete development.
Researchers have identified a receptor on sea urchin eggs that regulates the species-specific adhesion of sperm, preventing cross-fertilization between different species. The discovery provides insights into the molecular mechanisms of gamete interactions and could shed light on how new species evolved.
A UB research study found that sperm from marijuana smokers exhibit abnormal swimming behavior, moving too fast and too early, which can lead to infertility. The study suggests that THC may be causing improper timing of sperm function or bypassing natural inhibition mechanisms.
Scientists at Emory University Health Sciences Center have identified a new sperm protein called SED1 that plays a critical role in the initial association between sperm and egg during fertilization. Mice without this protein had reduced fertility despite normal sperm characteristics, highlighting its importance in successful binding.
Researchers found that older men's sperm contain more disease-causing genetic mutations, which surprisingly increase the chances of fertilization. The mutations may confer a competitive advantage to the sperm, contributing to the increased incidence of rare genetic diseases in children born to older fathers.
Scientists have observed a rare phenomenon in the insect world where a female Zeus bug allows a male to ride on her back, feeding on protein-rich wax produced by the female. This unusual behavior, known as 'female-led mating,' has sparked curiosity among researchers and provides new insights into the evolution of mating behaviors.
Researchers at U-M developed a new method for separating viable sperm using microfluidics, which increased motile sperm to 98% and improved sperm structure and form. The technique has the potential to benefit men with low sperm numbers and infertility problems.
A comprehensive international study of 541 ICSI and 440 IVF children found no significant differences in growth, medical illnesses, or cognitive development. However, a moderately higher rate of malformations was observed in the ICSI group, which may be due to selection bias.
IVF adoption is more accessible in Middle Eastern Muslim countries due to Islamic fatwa declarations. Shi'ite Muslims are permitted to use donor egg and sperm technologies, whereas Sunni Muslims are restricted, leading some men to reassess their marriages.
A new air-drying technique allows stored sperm to be transported without special equipment, relieving laboratories of sperm care. This method also reduces the risk of HIV transmission and gives owners more control over disposal decisions.
Researchers found semen volume increases with abstinence, but sperm morphology deteriorates over time. Abstaining for up to two days may be sufficient for some men undergoing fertility treatment.
Research found that short-term exposure to ethynylestradiol reduces sperm fertilization capacity in adult male trout. The study showed a 50% decrease in fertility with 10 nanogram per liter of ethynylestradiol, highlighting the potential impact on fish populations.
Researchers at the University of Toronto have discovered a gene, Fkbp6, essential for male fertility but not female fertility. The study shows that the gene plays a critical role in sperm cell development and chromosome pairing, highlighting potential new principles in how cells control the number of chromosomes.
A recent Italian study found that men exposed to high levels of traffic pollution have impaired sperm quality and reduced fertility. The research team examined semen samples from 85 motorway tollgate workers and 85 aged-matched controls, revealing deranged sperm parameters below World Health Organisation levels.
A study by Tufts University biologists found that female fireflies are attracted to males with longer flashes, indicating they can be better fathers. The length of a male's flash is related to the quality and quantity of his 'nuptial gift', which provides essential nutrition for his offspring.
Researchers have found an optimum amount of fluid motion enhances fertilization significantly, applicable to various species including humans. They also discovered a molecule controlling sperm navigation and an inhibitor blocking its effects.
A team of scientists has identified a molecule called bourgeonal that activates the human sperm receptor protein, which may play a critical role in fertilization. The discovery could lead to new non-toxic contraceptives and provide valuable insights into chemical communication during fertilization.
Researchers discovered that human sperm cells have a receptor for chemo-attraction, which triggers movement towards elevated concentrations of a sperm-attracting substance called bourgeonal. This finding suggests that sperm may be able to 'smell' their way to the egg.
Researchers from Italy studied over 14,000 births and found a significant disparity in sex ratios between optimal and sub-optimal reproductive conditions. The study suggests that nature tries to compensate for the vulnerability of male babies by favoring them in favorable months.
A study of 97 healthy men aged 22-80 found significant age-related decreases in semen volume and sperm motility. Semen quality is a proxy for fertility, suggesting that men may become progressively less fertile as they age.
A study by US researchers found a significant association between high lead levels in seminal plasma and low fertilization rates. Lead was shown to interfere with sperm function, including binding to the egg and penetrating its coating. The findings suggest that lead may be a contributory factor of declining sperm counts.
A study of 97 healthy men found that semen quality decreased with age, particularly in sperm motility. The researchers discovered a 0.7% decrease in sperm motility per year, impacting fertility from age 22 to 80.
Researchers at Weizmann Institute find that sperm are attracted to fertilization site by temperature difference. A temperature-driven mechanism, known as thermotaxis, guides the sperm through the fallopian tube and prepares them for penetration of the egg.
Researchers found that MSP binding to VAB-1 receptor triggers oocyte maturation in C. elegans, promoting successful fertilization. The study reveals an unexpected role for VAB-1 in reproduction.
Researchers at Vanderbilt University Medical Center have identified a sperm-sensing receptor in worm eggs, enabling egg maturation and ovulation. The discovery sheds light on reproductive problems in humans, including failed meiosis leading to chromosome instability.
A study by UCSF researchers reveals that the human gene BOULE regulates meiosis in sperm development, a key step in creating sperm and eggs. The finding has significant implications for understanding infertility and developing new treatments, including drugs to assist immature sperm cells or block sperm maturation.
A combination of DEET, permethrin, and pyridostigmine bromide may have inadvertently damaged Gulf War soldiers' testes and sperm production, according to a Duke University Medical Center study. The chemicals caused extensive cell degeneration and cell death in rats, leading to severe testicular damage.
Researchers have successfully transplanted immature mouse and rabbit testicular tissue, resulting in live births and mature sperm production. This breakthrough technique offers new hope for pre-pubertal boys and babies affected by cancer treatment, potentially restoring fertility through autotransplantation.
A recent study reveals that sperm in men older than 35 show more DNA damage, which could be passed on to offspring. The researchers found that older men have lower motility and more damaged DNA, with fewer apoptotic cells, indicating a decline in the ability of sperm to eliminate damaged cells.
Researchers have successfully restored sperm production in infertile mice by transplanting healthy Sertoli cells. The technique, developed by Dr. Ralph L. Brinster, may provide a new way to replace defective Sertoli cells and initiate normal spermatogenesis.
Researchers discover females actively select longer sperm for fertilization, leading to evolutionary changes in sperm size and female reproductive tract shape. This study challenges the long-held belief that males sacrifice quality for quantity in sperm production.
The study found that older men are more likely to have sperm with genetic mutations causing Apert syndrome, which increases the risk of having a child with the disease. The scientists suggest that the number of cell divisions in making sperm plays a role in this link.