Articles tagged with Oocytes
A more inclusive definition of infertility could help explain why current diagnostic tests frequently fail to find a reason for reproductive failure. This broader view may also open up novel opportunities for tailoring infertility treatments to each couple, considering the complex network of interacting male and female genes.
Researchers at Kyushu University successfully reconstitute the ovarian follicle from mouse stem cells, generating functional egg cells and growing viable mice. This breakthrough could lead to new treatments for infertility and help conserve endangered animals through egg cell production.
Researchers recreated ovarian follicle structures using mouse embryonic stem cells and successfully matured primordial germ cells into fully functional oocytes. The study provides a model system for studying later events of oogenesis and has implications for assisted reproductive technologies.
A retrospective observational study in the UK suggests that IVF clinics are retrieving an excessive number of oocytes, with some women having over 50 eggs collected during a single procedure. The high number of oocytes retrieved may lead to ovarian hyperstimulation syndrome and emotional distress for patients.
Research finds that age-related changes in RNA levels alter gene function in human egg cells, leading to impaired maturation and reduced fertility. The study suggests that age may influence an oocyte's ability to process critical genes, with potential implications for reproductive medicine.
Researchers discover fruit fly egg takes an active role in its own growth and supports neighboring cells, challenging the long-held view of passive egg development. The findings highlight parallels to mammalian development and suggest bidirectional communication between oocyte and nurse cells.
A new study in fruit flies reveals the process of oocyte growth relies on physical phenomena analogous to gas exchange between balloons. Nurse cells surrounding the larger oocyte dump their contents into it, using a counterintuitive mechanism where air flows from smaller to larger balloons.
Researchers at LMU have developed a theory explaining how cells perceive their own shapes and use this information to direct protein distribution. A concentration gradient within the cell encodes shape information, which is decoded by self-organized protein patterns.
A Brazilian study found that children born to obese mothers are more prone to developing metabolic disease due to a lack of the Mfn2 protein in their mother's eggs. This protein regulates mitochondrial function and energy production, leading to abnormal mitochondria shape and dysfunction.
Researchers at the Leibniz Institute for Zoo and Wildlife Research have successfully produced in-vitro embryos from vitrified African lion oocytes, demonstrating a promising method for genetic resource banking. The study showed that half of the vitrified oocytes matured, with seven early embryos developing, providing hope for the conse...
Two new northern white rhino embryos were created in December 2020 using advanced assisted reproduction technologies. This brings the total number of viable embryos produced to five. The successful embryo creation is a result of a regular rhythm of repeated oocyte collections, which will continue if possible.
Researchers at Kyushu University identified eight transcription factors that can convert mouse stem cells directly into oocyte-like cells. These findings offer a simple route for generating specialized substances unique to oocytes for use in reproductive biology and medicine.
A study published in American Journal of Human Genetics found that more than 7% of human oocytes have exchangeless chromosome pairs, indicating a high level of meiotic recombination failure. The research suggests that these errors are common and not affected by maternal age.
Researchers studied fruit fly ovaries to understand cellular motion, discovering that tissue geometry creates a path of least resistance. The team found that cells choose central paths despite multiple side paths available, and this choice is influenced by the physical space, not just chemical signals.
The GCRLE awarded $7.4 million to 22 researchers, including early career scientists and established scholars, to investigate the causes of female reproductive aging. The grants will support innovative projects addressing ovarian aging and its impact on health and longevity.
Researchers found that a specific histone modification, H4K16ac, is essential for embryonic development and drives gene activation in fruit fly offspring. The study suggests that mothers pass this information to their children through epigenetic modifications.
A Monash University study found that inhibiting cell death pathways in oocytes allows them to rapidly repair DNA damage, maintaining fertility. Double-strand breaks are the most harmful type of DNA damage, promoting genetic instability if not repaired correctly.
A recent study found that THC, the psychoactive ingredient in marijuana, impairs female fertility by decreasing embryo development and quality. The research suggests that females exposed to THC have lower rates of viable pregnancies and are more likely to experience infertility.
A new study in PLOS Biology identifies a regulator of jellyfish egg release, shedding light on the evolution of complex hormonal control in animals. The discovery sheds insight into how oocytes transform into eggs and may hold clues for understanding the link between sexual reproduction and nutrition in animals.
Scientists in China successfully induced granulosa cells to transform into functional oocytes in mice, which were then fertilized to produce healthy offspring. The chemical reprogramming method appears to offer a promising approach for preserving fertility and endocrine function.
Researchers discovered that DNA in early zygote is organized into Lamina Associated Domains (LADs) before gene activation, revealing a fundamental mechanism behind cell type identity. This discovery provides new insights into the development of an entire organism from a single fertilized oocyte.
Researchers developed a method to detect and edit DNA methylation in individual mouse oocytes, enabling predictions of offspring phenotype. The technique allows for correction of genetic disorders, such as Angelman syndrome, and may facilitate study of epigenetic information.
A novel DNA methylation regulator Stella has been identified to safeguard the unique epigenome of oocytes. The dysregulation of Stella results in aberrant DNA methylation during postnatal oogenesis, affecting preimplantation embryo development. DNMT1 is found to be responsible for this aberrant methylation.
New research reveals that Rnf212 helps create a 'cellular memory' of DNA damage in oocytes, allowing cells to assess the severity of defects and prevent defective eggs from being formed. This process ensures that only high-quality eggs are selected for the ovarian reserve.
Researchers found that high-fat diets suppressed a protein called TIGAR, which plays a role in meiotic spindle formation and antioxidant production. This led to increased reactive oxygen species and autophagy in oocytes, impairing development.
Researchers found that roundworms create oocytes with two nuclei but destroy them through apoptosis, recycling mitochondrial material into new eggs. This process helps understand why animals target so many cells for destruction during egg formation.
An international team of scientists has successfully created a hybrid embryo from Southern White Rhino eggs and Northern White Rhino sperm using assisted reproduction techniques. The breakthrough is published in Nature Communications today, offering hope for the survival of the endangered species.
Researchers have identified oocyte-specific factors that can drive somatic cell reprogramming by modulating the epigenetic landscape. These factors include histones and their chaperones, histone deacetylases and acetyltransferases, and transcription factors.
A study on 563 women who froze their eggs between 2009 and 2017 found that only 12.8% returned to the clinic for reproduction treatment, with an overall success rate of 32.6%. The majority of returning social freezers had found a suitable partner to pursue motherhood.
Researchers found that zinc deficiency can negatively affect egg cell division, viability, and quality, which could impact fertility. The study suggests that micronutrient availability during oocyte maturation is critical for successful fertilization.
Chemotherapy-induced DNA damage triggers apoptosis in oocytes due to p63 activation. Researchers found that inhibiting specific enzymes can prevent this process, offering new hope for fertility preservation.
Researchers at Princeton University have identified a drug that can extend egg viability in worms, which could theoretically increase women's reproductive lifespan. The study suggests that the drug could help slow age-related decline in egg quality and potentially extend fertility by three to six years.
Researchers develop ultrafast imaging method to map cell elasticity, revealing mechanical properties of cells and tissues. The technology has potential applications in cancer, pathogen-induced infection, scarring, and tissue engineering.
Two Northwestern University studies uncover how egg cells use innovative strategies to detect and prevent division errors, leading to birth defects and miscarriages. The research identifies essential proteins for cell division and a backup process that ensures the correct number of chromosomes is received by the embryo.
Researchers at Cornell University have identified a potential solution to protect premenopausal women from life-altering infertility after cancer treatment. By inhibiting the checkpoint pathway, the study found that oocytes survived radiation and remained fertile, enabling birth of healthy pups.
Researchers identified lipid accumulation mechanism in oocytes, limiting in vitro bovine embryo success. Excessive fat buildup impairs embryo development and viability.
Researchers at the University of Missouri have made a breakthrough in human in vitro fertilization (IVF) after discovering a method to improve success rates in pigs. By adding specific growth factors to a special liquid medium, they were able to increase efficiency and quality of embryos, potentially reducing costs for IVF treatments.
Researchers have successfully cryopreserved and revived zebrafish embryos using a novel method involving plasmonic gold nanoparticles. The technique has the potential to be applied to other species with similar embryonic sizes and structures, offering a breakthrough in preserving aquatic biodiversity.
A higher number of eggs retrieved in IVF treatment is linked to more chromosomally normal embryos available for transfer. The benefit of a greater oocyte yield decreases with advancing female age.
Researchers have developed a mathematical modeling technique that can quantify details about molecular dynamics in cells. The technique was applied to study RNA localization in egg cells and provided new insights into the process.
Research published in Occupational & Environmental Medicine found that physically demanding jobs and shiftwork are associated with poorer egg quality and lower fertility rates in women. Women working in heavy-lifting jobs or evening/night shifts had fewer mature eggs, representing a nearly 9% reduction in total reserve of eggs.
Researchers at OHSU and Salk Institute develop a new method to transmit a mother's genetic material into donor eggs, potentially increasing the success rate of infertility treatments. The technique could benefit women of advanced maternal age and those with mitochondrial mutations.
Researchers explore why human oocytes frequently have abnormal numbers of chromosomes, which can cause genetic disorders such as Down syndrome. Studies found that age-related deterioration of chromosome structure contributes to these errors.
Researchers found that increased reactive oxygen species in oocytes cause significant chromosome segregation errors, contributing to the maternal age effect. The study suggests that antioxidant-rich diets may slow down the accumulation of oxidative damage, reducing segregation errors.
Researchers at Instituto Gulbenkian de Ciencia cracked the mystery of centriole elimination in oocytes, showing that losing this structure is crucial for sexual reproduction and female fertility. The study found that centrioles are eliminated step-wise due to a regulator called polo kinase protein.
A new approach could help women of reproductive age preserve their fertility during cancer treatment by targeting DNA damage response in oocytes. This method has shown promise in animal models and may prevent premature ovarian insufficiency and infertility.
A recent study published in Cell reveals how eggs store fuel for embryo development by accumulating sugars during the final stages of maturation. Insulin signaling is inactivated, leading to reduced mitochondrial activity and sugar buildup.
A study of over 156,947 U.K. women found that extending IVF cycles beyond 3 or 4 treatment cycles can increase the likelihood of a live birth. Live-birth rates continued to rise with each additional cycle, with 65% of women achieving a live birth by the sixth cycle.
Studies reveal crucial role of histone chaperone protein in maintaining epigenetic landscape and genomic fidelity. Deletion of key protein leads to severe developmental defects, DNA damage, and compromised gene regulation.
A study published in JAMA found that using frozen donor eggs for IVF is linked to lower live birth rates compared to fresh eggs. The study analyzed data from over 11,000 cycles and found that per started cycle, the live birth rate was 43% with frozen eggs vs 50% with fresh eggs.
Research by Carnegie Institution scientists links steroid hormone ecdysone with fat accumulation and egg development in fruit flies. The findings suggest that increased stored body fat and sugars support healthy oocyte production and fertility.
Autologous and donor ART cycles showed low risk of complications, with OHSS being the most common patient issue. Maternal death rates decreased over time, indicating improved patient safety.
A Dartmouth study reveals a new protein linkage pathway that may help explain the molecular mechanisms behind birth defects in older women. The research shows that immature egg cells create replacement linkages after DNA replication, essential for maintaining meiotic cohesion over time.
Researchers have identified a key gene, ASF1A, that enables cellular reprogramming and the development of stem cells. This finding could lead to the creation of induced pluripotent stem cells derived from adult tissue, offering potential for safer cell-therapy strategies.
A survey of 973 women in the UK and Denmark found that while most are aware of egg freezing, only one in five consider it appropriate for their personal circumstances. The majority associate oocyte freezing with delaying childbearing until social and domestic circumstances improve.
A study by Dr Ana Cobo found that cumulative live birth rates increase progressively with the number of vitrified eggs used, reaching a plateau at 97.3% with 40 eggs. Egg banking can provide a large pool of donor eggs without synchronizing cycles, making it a more efficient and safer process.
A new study from the University of Southampton has found that chromosome errors in women's eggs occur due to a faulty gatekeeper mechanism. The researchers discovered that this 'gatekeeper' allows cells to divide with incorrect chromosomes, leading to conditions like Down Syndrome and early pregnancy loss.
The number of donor eggs used in IVF has increased significantly in the US, from 10,801 in 2000 to 18,306 in 2010. Good perinatal outcomes also improved, with a rise from 18.5% to 24.4%, while average donor age remained stable at 28 years and recipient age was not associated with outcomes.
Researchers have discovered a key signal that keeps oocytes alive: coenzyme A, which maintains enzyme CaMKII on, preventing cell death. This mechanism appears to be conserved in animals, offering potential therapies for preserving women's egg supply and fertility.
A study of egg banking for anticipated gamete exhaustion found that many women believe they'll never use their stored eggs, but still consider the experience positive. Most wish they had done so at an earlier age to preserve fertility.