Articles tagged with Oocytes
Researchers from New York Medical College and University of California Davis have developed an individualized patient data meta-analysis to report the probability of live birth after in vitro fertilization (IVF) with frozen eggs. The study shows that egg freezing success rates decline with age, with a sharper drop after age 36.
Researchers found that fetuin-B plays a crucial role in regulating the hardening of the zona pellucida, ensuring fertilization capacity. The discovery has potential therapeutic implications for infertility treatment.
Research reveals that maternal diabetes impairs the methylation of the maternal imprinting gene Peg3, contributing to impaired development in offspring. This effect is observed even before the onset of overt symptoms and affects embryo development and number of offspring.
Researchers at Wake Forest Baptist Medical Center have made a breakthrough in helping infertile, premenopausal women produce enough eggs to become pregnant. By stimulating ovarian cell production using an in vitro rat model, they were able to generate early-stage eggs that could be fertilized.
A new genetic study suggests that ovaries can form new eggs throughout adulthood, increasing the number of oocytes with age. This finding contradicts the long-held assumption that females are born with a fixed number of eggs and supports postnatal oocyte renewal in mammals.
A study by Harvard School of Public Health found that women with higher intakes of dietary saturated fats have fewer mature oocytes available for collection in IVF, leading to lower live birth rates. On the other hand, polyunsaturated fat consumption is inversely related to embryo quality.
Researchers have identified a new method for picking the 'right' egg in IVF by analyzing genes expressed in cumulus cells surrounding the eggs. This non-invasive approach may help avoid abnormal eggs with incorrect chromosomal make-up, increasing the chances of successful IVF cycles.
Researchers discovered that ovastacin, an astacin family member, cleaves the ZP2 protein in the zona pellucida matrix surrounding eggs. This proteolysis blocks additional sperm binding, preventing polyspermy and ensuring embryonic development. Ovastacin's function is crucial for single fertilization.
A study published in Advances in Neuroimmune Biology explores how maternal immunological tolerance of the fetus affects pregnancy outcomes. Researchers have discovered that cytokine expression at the fetal-maternal interface plays a significant role in determining oocyte competence and implantation rates.
A team of scientists at EMBL found that oskar RNA requires both tags to reach its correct destination, suggesting a 'ticket' that also affects its speed of transport. The study provides clues on how a single molecule could receive tickets for different destinations depending on the type of cell.
Massachusetts General Hospital researchers isolated egg-producing stem cells from adult human ovaries, demonstrating that these cells can produce normal egg cells. The findings support the idea that female mammals continue producing eggs into adulthood.
Researchers found that aging human oocytes have a distinctive DNA signature that is reversed in insulin and TGF-beta mutants. In contrast, somatic cells require maintaining protein and cell quality to combat aging. The study's findings could lead to ways to delay oocyte aging and reduce birth defects.
Exposure to Bisphenol A in in vitro oocyte cultures reveals altered development and increased risk of chromosome abnormalities like Down Syndrome. This multigenerational effect suggests BPA's potential impact on fertility and offspring health.
Researchers at Stowers Institute for Medical Research discovered that oocytes rely on an intracellular flow to push the meiotic spindle into place, setting the stage for asymmetric cell division. This finding may lead to improvements in selecting promising oocytes for in-vitro fertilization.
Researchers found that maternal height over 1.74cm and multiple oocyte retrieval (11+) are associated with twin pregnancies in IVF treatment. The study may lead to personalized fertility treatment with predictive models for choosing single or double embryo transfers.
Women's fertility is affected by chemotherapy due to oocyte quality control, which differs from male germ cells. The protein p63 plays a key role in this process.
Scientists have made progress in understanding the role of p63 in eliminating damaged egg cells before they mature. A study found that a specific form of p63, TAp63a, is activated by DNA damage and triggers cell death.
Scientists at Brown University and Women & Infants Hospital have made a groundbreaking discovery that could revolutionize the field of fertility treatments. They found a way to analyze the genetic material in discarded polar bodies from human egg cells, which may reveal insights into their ability to develop healthy embryos.
The world's first controlled study of genetic screening for IVF has resulted in the birth of healthy babies, twins in Germany and a singleton boy in Italy. The technique used is comparative genomic hybridisation (CGH), which can accurately predict chromosomal disorders with a 10% error rate.
Researchers found that worms and humans have similar genetic mechanisms controlling reproductive aging, which can inform fertility preservation therapies. Oocytes in both species degrade functionally and morphologically with age, but TGF-?? Sma/Mab and insulin/IGF-1 signaling pathways delay aging by maintaining oocyte quality.
Researchers found that weakened chromosome cohesion is the primary cause of age-related aneuploidy, leading to chromosomal abnormalities like Down syndrome. The study used naturally aging mouse models to demonstrate this finding.
Researchers have found vitrified eggs produce on-going pregnancies with similar success as freshly harvested oocytes. The study's results will improve egg banking practices, enabling cancer patients and others at risk of infertility to access fertility treatment more safely.
A study found that women with a genetic variation in their hormone receptor are more likely to have a poor response to FSH during fertility treatment. The abnormal receptor impairs the function of normal receptors, resulting in fewer oocytes produced.
Two studies found that younger women prioritize career success over motherhood, while older women seek egg freezing as a means to delay childbearing until finding the right partner. Egg freezing has become more accessible, but accurate information is still lacking, highlighting the need for targeted counselling and support.
Researchers found that microRNAs play a weak role in regulating mRNA stability in mouse oocytes lacking the Dicer enzyme. This suggests that reducing miRNA activity may be essential for oocyte-to-zygote transition, contributing to mRNA accumulation and stability.
Scientists at EMBL have visualized the molecular mechanism responsible for oskar mRNA transport in Drosophila. By combining immunofluorescence with electron microscopy imaging, they defined a hierarchy of RNA particle assembly. This breakthrough sheds light on development and neuronal function, including synaptic plasticity and learnin...
A study found that over 20,000 European patients travel across borders for fertility treatment annually, citing quality concerns and legal restrictions. The majority of respondents were seeking assisted reproduction treatment, with countries like Italy, Germany, and France having the highest number of cross-border patients.
A new study found that animal oocytes cannot fully reprogram adult human cells, making them unsuitable substitutes for producing patient-specific stem cells. The researchers tested using oocytes from cows, rabbits, and humans, but failed to achieve the necessary gene expression changes.
A recent study published in Biology of Reproduction found that SOHLH2 plays a critical role in the formation and survival of oocytes and primordial follicles in mouse ovaries. The study, led by Youngsok Choi et al., discovered that SOHLH2 is essential for both oogenic and folliculogenic processes.
Researchers have successfully treated HIV-seropositive women with assisted reproduction, achieving pregnancies and stable infant outcomes. Additionally, studies found that SC Ovidrel can be reliably used for egg-cell donation and pregnancy is possible in breast cancer patients after chemotherapy, despite reduced fertility.
The Rong Li Lab discovered that chromosomes recruit formin-2 to promote actin filament formation around chromosomes, driving chromosome movement and asymmetric cell division. This process allows the oocyte to retain most of its cytoplasm while the polar body receives minimal amounts.
A new ovarian stimulation technique allows women with cancer to collect eggs for freezing during the luteal phase, reducing wait time before treatment. The technique has shown promising results in triggering ovulation and collecting mature eggs within two weeks.
The Hawley Lab has identified two molecular mechanisms that restart the meiotic cycle in oocytes, including the controlled expression of Polo kinase and the inactivation of inhibitory protein Matrimony. This discovery has significant implications for understanding egg maturation and releasing, as well as treating infertility and cancer.
A team of scientists from EMBL has uncovered the assembly mechanism of a bipolar spindle in oocytes, allowing them to accurately separate chromosomes. This process is crucial for proper egg development and fertilization.
Researchers at MGH confirm that bone marrow transplantation after chemotherapy restores fertility in female mice, with donor-derived egg cells observed but not involved in fertilization. The study also reveals that resuming mating and bone marrow transplants shortly after chemotherapy improve fertility rates.
A new study has achieved four successful pregnancies using immature oocytes collected from unstimulated ovaries, matured in vitro, and then vitrified, marking a significant breakthrough in fertility preservation. The research has the potential to become an important option for patients with PCOS or those who cannot undergo ovarian stim...
Researchers have discovered that aged, fertilization-failure mouse oocytes can be used as cytoplasmic donors in nuclear transfer procedures, paving the way for future human egg use. This breakthrough could optimize cloning protocols and reduce waste of discarded IVF eggs.
Research published in Human Reproduction found that heavy smoking significantly lowers pregnancy rates among women who received donated oocytes, regardless of their own ovarian function. Heavy smokers had a lower chance of achieving pregnancy but higher multiple birth rates compared to non-heavy smokers.
Researchers at FSU have identified a key component in cell polarity formation in fruit fly eggs, which also play a role in human diseases like muscular dystrophy and some cancers. The study's findings could lead to a better understanding of how cell-to-cell communication occurs in other types of cells and organisms.
Researchers find that female mice can maintain a steady number of eggs throughout adulthood, contradicting the long-held assumption that eggs decline with age. The study's findings suggest potential directions for ovarian stem cell research and fertility treatments.
A new egg freezing technique called Cryotop method has been developed, achieving a more than 90% survival rate for frozen-thawed eggs and a high pregnancy rate of nearly 42%. The process involves rapid freezing in a tiny amount of special vitrification solution, preventing ice crystals from forming damage to the egg. This technology op...
Researchers at Joslin Diabetes Center found that circulating bone-marrow derived cells do not produce oocytes or facilitate their ovulation. The study used a parabiotic mouse model and hormones to stimulate ovulation, demonstrating that oocytes are not seeded by blood-borne cells.
A study found that genistein, a major soy component, disrupts ovarian development in newborn female mice. High doses of genistein were associated with infertility and subfertility, while lower doses caused abnormal ovary function.
Duke University Medical Center researchers discovered that an immature egg's internal nutrient supply is critical to its survival. The study found that adding nutrients prolongs the life of eggs and depleting them triggers apoptosis, offering a new route to understanding and treating infertility due to egg death.
Researchers successfully transplanted whole ovary from frozen-thawed sheep into the same animal or another, showing long-term ovarian function. The technique could become a treatment for women facing premature ovarian failure and potentially revolutionize organ transplantation.
Researchers found that stem cells in the bone marrow of female mice can produce new egg cells, contradicting long-standing theories on mammalian reproductive physiology. This discovery could lead to new treatments based on regenerative medicine.
Researchers at European Molecular Biology Laboratory discovered that actin fibres are necessary to help microtubules transport chromosomes during cell division. In a study using starfish oocytes, the team found that actin networks gather chromosomes together before they can be pulled by microtubules.
Researchers have made history by cloning human embryos using matured lab-grown eggs and non-autologous nuclear transfer. Eighteen out of 25 in vitro matured oocytes survived the process, with 11 developing into pronuclei.
A 39-year-old woman gave birth to a healthy baby girl after undergoing orthotopic autotransplantation of cryopreserved ovarian tissue. This procedure bypasses the need for in-vitro fertilization, offering new hope for young cancer patients facing premature ovarian failure.
Researchers found that adult ovaries produce new oocyte-containing follicles, defying the traditional understanding of ovarian function. Ovarian follicle numbers even increased with age in some strains of mice.
Researchers found a high rate of follicle degeneration in mice without a corresponding reduction in healthy follicles, refuting the idea of a fixed egg supply. The study suggests that ovaries retain the ability to produce new oocytes and follicles, potentially leading to new approaches to combating infertility.
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.
Researchers have identified a complex mechanism of translational repression in Drosophila oogenesis, involving proteins Cup, Bruno, and eIF4E. This study reveals how these proteins work together to repress the translation of critical mRNAs, ensuring precise localization and function in germline cells.
Research found that aging brains reduce ovulation in women, leading to decreased fertility. The study suggests that high oestrogen levels and decreased LH release contribute to this effect.
Scientists have discovered two key proteins, XCAP-E and XCAP-D2, that remain apart at a critical time before condensation occurs in frog oocytes. These findings may help study chromosome physiology, particularly the functional aspects of these proteins.
Researchers have successfully created an artificial egg using somatic cells, a breakthrough that could lead to new treatments for infertility. The study involved transferring the nucleus of a somatic cell into an immature oocyte and then inducing chromosome segregation to produce a haploid egg.
A study of children born after in vitro maturation indicates the technique is safe. The children, aged two to four years old, achieved higher than average scores in developmental tests. They were found to be healthy with no notable exceptions, supporting the safety and effectiveness of IVM for women with polycystic ovarian syndrome.
A French team of fertility experts discovered that maternal genetic imprinting errors can occur during egg follicle development in mice. The research found that methylation patterns, essential for normal development, were disrupted at the earliest stages of in-vitro cultivation.
Researchers at the University of Pennsylvania have successfully produced mouse eggs from embryonic stem cells outside the body, showcasing their totipotent capabilities. This breakthrough could lead to new methods for producing embryonic stem cells artificially, potentially sidestepping ethical concerns.
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.