Articles tagged with Aneuploidy
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Researchers at Stowers Institute for Medical Research have identified the precise location where human chromosomes break and recombine to form Robertsonian chromosomes. The study reveals that repetitive DNA sequences play a central role in genome organization and evolution, explaining how these rearrangements form and remain stable.
A team at IRB Barcelona developed a tool to generate customized aneuploidies, precisely labeling cells carrying these abnormalities in living tissue. This allows for real-time observation of cell behavior, revealing the presence of haploinsufficient genes and their removal through cell competition.
A study found that smaller embryos already hatching are more likely to be chromosomally normal. This insight helps fertility clinics select better embryos during IVF, particularly for women over 35 or those undergoing PGT-A.
A recent study found that autophagy, a natural defense mechanism in cells, is less efficient in female eggs with moderate or severe DNA damage. Boosting autophagy can improve egg quality and reduce the risk of miscarriage and birth defects. The study's findings offer new directions for improving reproductive health.
A new study from the University of Texas M. D. Anderson Cancer Center found that at least 3% of normal breast tissue cells in healthy women contain chromosome abnormalities associated with invasive breast cancer, which may guide future approaches to early detection.
Researchers at Tel Aviv University discovered that aneuploid cells, which have an abnormal number of chromosomes, are more susceptible to certain types of anticancer drugs. The studies found that disrupting the MAPK pathway increases the sensitivity of these cancer cells to chemotherapy.
A Chinese Medical Journal study developed an AI-based system to automate embryo selection and eliminate subjectivity in IVF. The system improved human embryo assessment and selection, achieving higher accuracy in embryo aneuploidy screening than experienced embryologists.
A study by Charité researchers found that yeast cells can compensate for aneuploidy by exchanging proteins faster. This mechanism could be used to tackle treatment-resistant tumors and fungal infections. The study identified a previously unknown compensation system based on Saccharomyces cerevisiae.
Researchers at Johns Hopkins Kimmel Cancer Center and University School of Medicine developed an algorithm, REAL-FAST, to identify high-risk precancerous lesions on the fallopian tubes. The test accurately detected cancer 95.8% of the time and correctly ruled out cancer 97.1% of the time.
Researchers at the Francis Crick Institute have identified the first prehistoric person with mosaic Turner syndrome, characterized by one X chromosome instead of two. The study also found the earliest known incidence of Jacob's syndrome, Klinefelter syndrome, and an infant with Down Syndrome in ancient DNA samples.
A new study validates Low-Pass Genome Sequencing (LP GS) as a robust and cost-effective alternative to Chromosomal Microarray Analysis (CMA) for prenatal diagnosis. LP GS detects six additional Copy Number Variations (CNVs) in cases with negative CMA results, highlighting the importance of sequencing depth in its detection sensitivity.
A new AI algorithm, STORK-A, can predict IVF embryo viability with 70% accuracy, reducing the need for invasive genetic testing. The algorithm analyzes microscope images of embryos and incorporates information about maternal age and IVF clinic scoring to detect aneuploidy.
Researchers at University of Chicago Medical Center have identified biomarker predicting response to combined RT and ICB treatment in mNSCLC. High tumor aneuploidy associated with improved survival when RT is added to ICB, while low aneuploidy shows no survival benefit.
Researchers at La Jolla Institute for Immunology discovered a direct link between TET protein loss of function and missing genes in embryonic stem cells, which can lead to cancer growth. The study found that TET proteins are crucial for maintaining genome stability, and their loss results in aneuploidies, a common feature of cancer cells.
MUSC researcher Joe Delaney, Ph.D., is awarded $453,000 to investigate aneuploidy in ovarian cancer. His project aims to target the cadmium response pathway and develop a new type of cancer drug for patients.
Scientists developed a same-day test to identify abnormal fetal chromosomes using prenatal tests and tissue from miscarriage or biopsies. The STORK test shows promise in diagnosing genetic causes of miscarriage and streamlining IVF, potentially saving time and cost.
Research in C. elegans reveals that intestinal stress signals can control oocyte chromosome stability, influencing egg quality control and heritable euploidy. This study opens new possibilities for eliminating environmental influences and preventing malformations.
A study found that many IVF embryos with chromosomal abnormalities have the potential to lead to successful pregnancies. Embryos with low-grade mosaicism had similar live birth rates and miscarriage rates as euploid embryos.
Researchers at the University of Kent identified strong evidence-based benefits of preimplantation genetic testing for aneuploidy (PGT-A) in IVF. Live birth rates per embryo transferred and per treatment cycle were significantly higher with PGT-A compared to regular IVF, especially in women over 40.
Researchers describe how cancer cells exploit genetic and cellular processes to promote tumor survival and growth. The study found that aneuploidy, a condition of abnormal chromosome number, intersects with the stress response mechanism in cancer cells, leading to immune cell dysregulation.
A breakthrough IVF method has been developed to significantly improve in-vitro fertilization (IVF) in cattle, reducing pregnancy issues and increasing overall meat and milk production. The new process improves live birth rates with a high accuracy rate, offering vast potential for the cattle breeding industry.
Researchers at Dana-Farber Cancer Institute found that patients with non-small cell lung cancer and low aneuploidy levels tend to have better outcomes following treatment with immune checkpoint inhibitors. These findings suggest that aneuploidy testing can help determine which treatment is most likely to benefit patients.
Researchers identify patients at high risk for esophageal adenocarcinoma through aneuploidy detection in Barrett's Esophagus, allowing for early intervention. The new method, RealSeqS, is quick, cost-effective, and can process hundreds of samples, making it ideal for clinical implementation.
Researchers discovered that aneuploid cancer cells demonstrate heightened sensitivity to damage to the mitotic checkpoint, making them more susceptible to treatment. The study's findings suggest that using aneuploidy as a biological marker could help identify patients who will respond better to certain drugs.
Researchers discovered that cancer cells with an abnormal number of chromosomes (aneuploidy) are more sensitive to inhibition of the mitotic checkpoint, a cellular mechanism that ensures proper chromosome separation during cell division. This finding has important implications for personalized cancer medicine and drug discovery.
Researchers found that 80% of embryos studied contained at least one aneuploid cell across all cell types and developmental stages. This suggests that embryos with abnormal cells may still develop into healthy pregnancies, challenging the current debate around IVF embryo selection.
Two Harvard Medical School studies provide new insights into normal and abnormal DNA recombination during sperm and egg cell formation. Researchers report variable rates of chromosome abnormalities and found evidence that a single biological process regulates the number, location, and spacing of crossovers where parents' DNA recombines.
Research reveals some extra chromosomes in cancer cells can inhibit metastasis and even increase survival rates for patients. A study published in Developmental Cell found beneficial aneuploidies associated with increased survival, contrary to the long-held notion that aneuploidy always skews gene activity towards aggressive cancers.
Researchers found higher levels of aneuploidy lead to greater lethality risk among prostate cancer patients, suggesting a possible way to predict prognosis and inform treatment. The study also identified chromosomes 7 and 8 as commonly aneuploid in prostate tumors.
Abnormal chromosome number abnormalities are linked to increased risk of lethal disease in prostate cancer patients. Patients with five or more predicted aneuploidy alterations had a 5.3 times higher odds of lethal cancer during follow-up.
A team of researchers at Queen Mary University of London has identified two proteins that enable the correct attachment between chromosomes and microtubules, which are crucial for maintaining a normal number of chromosomes in human cells. This discovery could help in treating diseases such as cancer and fertility problems.
A new study reveals that chromosomally 'abnormal' embryos can still result in pregnancy through IVF, with the potential for self-correction and development into a healthy fetus. The extent of mosaicism influences clinical outcomes, suggesting priority should be given to mosaic embryos with low aneuploidy levels.
Researchers found that aneuploidy, a condition causing abnormal chromosome numbers, can lead to varying outcomes in genetically identical cells. The study's findings have significant implications for cancer treatment, as it may explain why some cancer cells respond differently to therapy.
Pre-implantation genetic screening (PGS) has mixed results in predicting embryo success, with uncertain impact on IVF outcomes. The technology's limitations stem from complex biology and ideology, hindering the development of new technologies to improve infertility care.
A new study found that high-aneuploidy tumors have increased expression of genes involved in DNA replication and cell cycle, but decreased expression of genes characteristic of immune cells. This suggests that jumbled chromosomes in tumors may limit the effectiveness of immunotherapy treatments.
The American College of Medical Genetics and Genomics has released an updated position statement on noninvasive prenatal screening for detection of fetal aneuploidy. The guidelines provide recommendations for obstetric care providers and patients regarding the use of noninvasive prenatal screening (NIPS) in prenatal practice.
A recent study published in Developmental Cell reveals that 68% of solid tumors are aneuploid, meaning they have an abnormal number of chromosomes. Aneuploidy contributes to genomic instability and cancer progression by triggering cell death and proliferation signals.
Researchers identified a common genetic variant associated with aneuploidy, a condition causing chromosome gains and losses during embryonic development. The variant was found to be strongly linked to early pregnancy loss and IVF treatment failure.
A study found a correlation between abnormal noninvasive prenatal testing (NIPT) results and subsequent maternal cancer diagnoses. Occult malignancies may explain discordant NIPT results, highlighting the need for diagnostic procedures to determine fetal karyotypes.
A new study published in the New England Journal of Medicine found that noninvasive prenatal testing using cell-free DNA significantly reduced false positive results and had higher predictive values for detecting fetal trisomies 21 and 18 compared to standard screening methods.
A study found that non-invasive prenatal testing (NIPT) detected over 83% of chromosomal abnormalities, including trisomies 13, 18, and 21. The test was more accurate for women over 40, but had lower sensitivity for younger women.
Researchers at the University of Edinburgh identified shugoshin as a critical protein in ensuring accurate cell division. The study found that disabling shugoshin led to increased abnormal chromosome numbers, highlighting its importance in preventing aneuploidy and potentially cancer.
A new study at Harvard Medical School proposes that aneuploidy is a driver of cancer development rather than just a result. Researchers analyzed genome sequence data from over 8,200 pairs of cancerous and normal tissue samples to identify patterns in tumor evolution.
Researchers discovered unisexual reproduction in Cryptococcus neoformans, introducing genetic diversity and potentially driving disease outbreaks. Aneuploidy, a genetic change, led to beneficial, neutral, or detrimental changes in offspring fitness, including drug resistance and virulence.
Researchers found yeast cells can multiply up to six of their chromosomes during cell division and reverse this process, allowing for rapid adaptation to environmental conditions. This discovery provides a new model organism for studying aneuploidy and its potential implications for diagnosing and treating human diseases.
A study presented at the Society for Maternal-Fetal Medicine's annual meeting demonstrated that massively parallel sequencing of maternal plasma DNA can detect all three most prevalent fetal aneuploidies. The test showed 100% sensitivity and specificity for trisomy 21 (Down syndrome) and high accuracy for other autosomal aneuploidies.
Researchers at Johns Hopkins University have developed a new technique to detect both genetic diseases and chromosomal abnormalities in IVF embryos. This method allows for the simultaneous detection of single-gene mutations and aneuploidy, enabling couples to choose healthy embryos for implantation.
Researchers at Oregon Health & Science University discovered that multipolar mitosis, a form of cell division typically associated with cancer, can produce diverse and viable cells capable of protecting the liver from injury. This process may reveal why some individuals are more susceptible to liver diseases.
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 demonstrate how aneuploidy, or abnormal number of chromosomes, causes cancer by eliminating tumor suppressor genes. The findings provide a new understanding of the mechanism underlying cancer development and may lead to targeted therapies.
Scientists at the University of Tennessee have found that a single mutation in the Bub1 gene can lead to an increased risk of pregnancy loss and disorders such as Down Syndrome. The study suggests that the mutation affects fertility and increases with maternal age, highlighting a potential genetic link to these conditions.
Researchers have found that a mutation in just one copy of the Bub1 gene can lead to aneuploidy in mice, increasing the risk of genetic disorders like Down syndrome and pregnancy loss. The study's findings suggest that age is also a contributing factor, with older female mice having fewer offspring.
Researchers at Howard Hughes Medical Institute have created a non-invasive blood test that accurately detects Down syndrome and two other serious chromosomal defects. The test is more accurate than previous methods and can provide results within a few days, reducing the wait time for anxious parents.
Researchers found an association between high folate intake and lower levels of chromosomal abnormalities in men's sperm. The study suggests that increasing folate intake through diet or supplements may reduce the risk of chromosomal abnormalities in children.
A new study reveals an alternative distribution mechanism in female sex cells that cause chromosome disorders, leading to infertility and irregular numbers of chromosomes. This fundamental mechanism may help explain the common occurrence of such disorders in females.
Researchers at UCSD School of Medicine discovered a genetic mechanism that can both drive tumor growth and act as a tumor suppressor. This finding could lead to new cancer therapies by targeting aneuploidy, a characteristic of cancer cells with extra or missing chromosomes.
Men who undergo vasectomy reversal have a significantly higher rate of chromosomal abnormalities in their sperm compared to fertile men. The study found that the duration of obstruction and time interval after reversal are associated with increased abnormality rates, raising concerns about potential long-term effects on fertility.
MIT researchers have discovered that tumor cells become aneuploid due to subtle errors in microtubule attachment. The study sheds light on the role of checkpoint proteins and their interaction with APC and EB1 molecules in maintaining normal cell division.
Researchers identified a two-protein complex Rae1-Nup98 that stabilizes healthy cells by preventing premature chromosome separation. This discovery challenges the long-held understanding of aneuploidy's mechanism and offers a new approach to cancer treatment, potentially leading to more effective and gentler therapies.
UVa researchers have identified a mechanism that can correct improper microtubule attachments during cell division. A protein called Aurora B loads MCAK onto the chromosome in an inactive state, which is activated to remove improperly attached microtubules.