Articles tagged with Down Syndrome
Researchers discovered specific mutations in the JAK2 gene associated with Down's syndrome-associated acute lymphoblastic leukemia, which could lead to new treatment options. Children with this type of leukemia are younger at diagnosis and have a better prognosis when treated with JAK2 inhibitors.
Breakthroughs in cytogenetic technologies have enabled a new level of detail and accuracy in diagnosing complex developmental problems in children. Researchers are now using these tests to identify microdeletions and microduplications, leading to more accurate diagnoses and effective treatments.
A 70-year-old man with Down syndrome has aged successfully despite having the condition, challenging previous assumptions about Alzheimer's disease and increasing hopes for longer, healthier lives. Comprehensive analyses reveal potential explanations for 'Mr. C''s' remarkable case, including gene expression and an atypical genotype.
Researchers discovered that extra chromosome 21 in embryonic stem cells disrupts a key regulating gene called NRSF or REST, leading to developmental changes. The study identifies a specific gene, DYRK1A, on human chromosome 21 responsible for the observed effects.
A study published by the American Academy of Sleep Medicine found that children with Down Syndrome have more fragmented sleep and frequent awakenings compared to typically developing children. The study suggests that this may be an independent issue and may impact cognitive, behavioral, and physical growth.
Current prenatal biochemical screening tests only detect half of chromosomal abnormalities, including trisomies and deletions. This limitation emphasizes the importance of counseling patients on the limitations of these tests to make informed decisions about invasive diagnostic testing.
Researchers found that extra copies of a particular gene can repress tumor growth, while missing a copy enhances tumor growth. Mice with three copies of the gene had fewer tumors than those with two copies, while mice with one copy developed more tumors.
A study found that children with Down syndrome have significantly higher body mass index and percentage of body fat compared to their siblings. Leptin levels also correlate with these differences, suggesting a genetic predisposition to leptin resistance in individuals with Down syndrome.
Scientists have developed a rapid prenatal test for Down syndrome that produces accurate results within two hours. The new method uses digital polymerase chain reaction and is potentially cheaper and simpler than existing tests, reducing the workload of lab personnel.
The article challenges the routine use of ultrasound as a screening procedure for chromosome abnormalities, suggesting that foetal 'nuchal thickness' measurements are not supported by scientific data. This could lead to the 'loss' of normal babies in attempts to prevent Down's syndrome and trisomy 18.
In Denmark, non-invasive screening of pregnant women using ultrasound and blood analysis has reduced the number of children born with Down Syndrome by 50%. The new guidelines have also led to a significant decrease in invasive pre-natal diagnostic procedures, from 11% to around 6% of pregnancies.
Researchers at Stanford University School of Medicine and Lucile Packard Children’s Hospital found a once-a-day treatment with PTZ improved learning and memory in mice with Down syndrome symptoms. The gains lasted for months after the treatment was discontinued.
A new non-invasive prenatal testing method has been developed and tested on 60 pregnant women, identifying chromosomal abnormalities in 58 cases, including two trisomy 21 instances. While preliminary, the technique holds potential as a complement to existing prenatal tests with further refinement.
Research by Markus Neuhäuser and Sven Krackow found that the number and age of existing siblings significantly influence Down Syndrome risk. The study suggests that older mothers with a larger gap between pregnancies are more likely to have children with developmental defects.
A large follow-up study of over 50 families has identified more genetic perturbations in Loeys-Dietz Syndrome, providing clearer picture for diagnosis. The study emphasizes the importance of comprehensive clinical evaluations when diagnosing the disease.
Researchers at Indiana University School of Medicine found that routine screening for celiac disease in asymptomatic children with Down syndrome can have negative consequences on their quality of life. The study suggests that the cost of screening and treatment may outweigh the potential benefits, making it a less beneficial practice.
Researchers at Stanford University School of Medicine and Lucile Packard Children's Hospital have identified a gene that overexpressed causes neurons responsible for attention and memory to shrivel in people with Down syndrome. Deleting or reducing the expression of this gene may provide therapeutic options for cognitive decline.
Studies in mice genetically engineered to mimic Down's syndrome found that increased expression of one gene, amyloid precursor protein (APP), disrupts transport of nerve growth factor (NGF) and leads to neuronal death. Restoring normal cellular levels of a Trk receptor for BDNF rescues neuronal death.
A study led by Lawrence Livermore National Laboratory found a steady increase in sperm DNA fragmentation with increasing age of participants. Sperm motility showed a high correlation with DNA fragmentation, associated with increased risk of infertility.
Daniel Zheng won the SIAM award for his project on the long-term effects of smoking on Down Syndrome. His project demonstrated a wide range of skills and techniques, impressing judges with its mathematical model and motivations.
A study of 56 children with Down syndrome found that 57% had abnormal sleep patterns and evidence of obstructive sleep apnea syndrome. In contrast to parental reports, only 25% met the normal REM sleep criteria.
Researchers have developed a hand-held device that enables people with disabilities, including autism and Down's syndrome, to communicate using barcodes. The B.A. Bar has been shown to be more effective than simple pictures in helping users learn to speak and become more independent.
The study found that cleft lip and/or palate had the highest prevalence, followed by Down Syndrome, among the 18 major birth defects studied. National estimates for specific defects were calculated for the first time, providing valuable insights into birth defect prevalence nationwide.
Research suggests that adults with Down syndrome have higher concentrations of myo-inositol in the brain, leading to reduced cognitive ability and increased risk of early-onset Alzheimer's disease. The study aims to develop a new treatment approach by reducing myo-inositol levels in the brains of people with Down syndrome.
A new screening test has been developed to detect Down syndrome in pregnant women at an earlier stage of pregnancy and with greater accuracy. The test combines a blood analysis with an ultrasound scan to determine the risk of chromosomal abnormalities, allowing for prenatal diagnosis within the first trimester.
A study found that withdrawing full karyotyping from prenatal diagnosis for Down's syndrome could lead to undetected other chromosome abnormalities, resulting in preventable mental or physical handicaps. The researchers suggest using PCR plus karyotyping for more efficient detection of clinically significant chromosome abnormalities.
A recent study found that only 37% of patients with colorectal cancer received adequate lymph node evaluation, highlighting the need for improved surgical care and pathologic assessment. Additionally, research on non-Hodgkin lymphoma and obesity suggests no association between body mass index and overall risk of either disease.
A study found that physicians frequently advise mothers to consider adoption or are insensitive in their delivery of the diagnosis. However, mothers with positive birth experiences had physicians who talked positively about Down syndrome. The study offers a 10-point prescription for improving communication.
Researchers discovered that overexpression of Down Syndrome Critical Region 1 (DSCR-1) reduces tumor growth and blocks blood vessel formation. This breakthrough could lead to novel strategies for inhibiting endothelial cell dysfunction and abnormal blood vessel formation.
A mouse study challenges the idea that a specific gene region is responsible for Down syndrome's characteristic facial features and traits. Researchers found that mice with only two copies of this region still exhibited shorter bones, contradicting previous assumptions.
Researchers found that brain scans show increased metabolic activity in the temporal cortex, where Alzheimer's disease commonly develops, in adults with Down syndrome. The study suggests that this may be an early indicator of Alzheimer's, potentially allowing for early detection using a common PET scan procedure.
Researchers have discovered a direct correlation between Bmp4 activity levels and septum development in congenital heart disease. By manipulating Bmp4 expression, the team recreated the full spectrum of defects seen in AVCD patients, providing a valuable genetic model for future research.
A study by Dr. Joel Ray found that folic acid fortification has no immediate effect on the incidence of Trisomy 21 (Down Syndrome) in Canada. Research suggests that genetic mutations may occur before fetal development, making folic acid supplementation less effective in preventing the condition.
Researchers used fruit flies to study how age affects meiosis, a specialized cell division that gives rise to eggs and sperm. The study found that as fruit fly eggs 'age', errors in cell division increase, mirroring the phenomenon in humans, where birth defects like Down syndrome rise with maternal age.
A collaborative research group investigated whether Down's syndrome and NTD arise more often in the same family. The study found a significant link between the two conditions, with increased rates of pregnancy loss among families at high risk of NTD and Down's syndrome.
A quadruple test that measures four maternal blood markers is more effective than earlier single marker tests in detecting Down's syndrome pregnancies. The test detected 81% of Down's syndrome cases, while a single marker test detected only 51%.
Researchers at Johns Hopkins Medicine have created SNOMAD and DRAGON to help decipher the complex patterns of gene activity in brain tissue. By applying these tools to microarray data from conditions like Down syndrome, they aim to identify genes involved in causing problems.
Scientists have identified specific genes on chromosome 21 that contribute to Down syndrome, a condition affecting one in 800 live births. The discovery provides a roadmap for understanding the genetic causes of the disorder and potentially developing new therapies.
A new study from the University of Wisconsin-Madison suggests that individuals with Down syndrome can continue to improve their language skills well into young adulthood. Language comprehension skills tend to plateau during late adolescence, while language expression skills continue to develop and even improve in some cases.
Researchers have found a gene mutation that causes acute megakaryoblastic leukemia in children with Down syndrome, increasing their risk by 10-20 times. The discovery highlights the importance of GATA1, a transcription factor regulating red blood cell and platelet production.
A recent study using human stem cells has made significant breakthroughs in understanding the origin of Down syndrome, one of the most common causes of developmental disabilities. The research found a faulty genetic circuit that disrupts brain development, leading to a deficit in specific genes critical for neuronal growth.
A new ultrasound technique using fetal nasal bone examination at 11-14 weeks pregnancy improved the accuracy of Down's syndrome screening by increasing sensitivity to 85% and reducing false positives. The study found that fetuses without a nasal bone were 150 times more likely to have trisomy 21 compared to normal fetuses.
Researchers found that regular treadmill exercise with parents can help children with Down Syndrome walk three and a half months sooner than those without therapy. This early mobility improves independence and reduces stress for parents.
Researchers compared whole genome activity in trisomy mice brains to normal mice detecting 25,000 genes active, with altered protein manufacturing found in trisomy mice. This study provides a preliminary look at how the whole genome operates in the brain and suggests protein manufacturing could be altered in Down syndrome patients.
A new prenatal screening test has been developed to detect Down syndrome cases in the first trimester, identifying over 90% of cases. The test combines a blood test and an ultrasound exam, detecting more cases than traditional triple tests and providing earlier reassurance to pregnant women.
A new screening test combining blood and ultrasound exams can identify over 90% of Down syndrome cases in the first trimester of pregnancy. The test, Ultrascreen, has the advantage of detecting more cases earlier than traditional tests.
The German-Japanese Consortium has successfully sequenced human chromosome 21, revealing 225 genes with implications for understanding trisomy 21 and other diseases. The findings also challenge previous estimates of the total number of human genes, suggesting a revised estimate of around 40,000.
A recent study reveals that children with Down syndrome are susceptible to severe periodontal disease due to factors such as inadequate oral hygiene and congenital deformities. Research suggests that proper plaque control can help ward off the disease, emphasizing the importance of regular dental visits and education for parents.
Increasing folate levels prior to conception could reduce Down syndrome risk, according to a study funded by the FDA. Folate deficiency at conception increases neural tube defect risk, including spina bifida, which is the leading cause of childhood paralysis.
Researchers are evaluating a combined-risk assessment method that combines blood protein markers and ultrasonography measurements to predict fetal abnormalities. The test has an estimated detection rate of up to 90% and could lead to earlier diagnosis and reduced invasive procedures.
Researchers developed a new blood test that can detect Down syndrome in the first trimester with accuracy rates exceeding 60%. The test combines measurements of human chorionic gonadotropin and pregnancy-associated protein A to identify women at higher risk of carrying a fetus with the condition.
Research by Indiana University kinesiologists suggests that encouraging leg movements on a miniature treadmill can lead to an eight-to-12 month improvement in the time Down syndrome babies take their first independent steps. This intervention is found to decrease family stress and facilitate cognitive, spatial, and social development.
Researchers found higher Down syndrome prevalence among Hispanic mothers under 40, lower rates among older mothers, compared to white counterparts. Prenatal genetic testing usage also showed significant differences between ethnic groups.