Humans normally have 46 chromosomes in each cell, divided into 23 pairs. Two copies of chromosome 15, one copy inherited from each parent, form one of the pairs. Chromosome 15 spans about 100 million base pairs (the building blocks of DNA) and represents more than 3 percent of the total DNA in cells.
Identifying genes on each chromosome is an active area of genetic research. Because researchers use different approaches to predict the number of genes on each chromosome, the estimated number of genes varies. Chromosome 15 likely contains between 650 and 1,000 genes.
Genes on chromosome 15 are among the estimated 20,000 to 25,000 total genes in the human genome.
Today, PWSA (USA) announced its support for H.R.4144 - Ending the Diagnostic Odyssey Act of 2019, a bill to enable States to better provide access to whole genome sequencing clinical services for certain undiagnosed children under the Medicaid program, and for other purposes.
Scientists have identified a specific gene they believe could be a key player in the changes in brain structure seen in several psychiatric conditions, such as schizophrenia and autism.
New funding is enabling Walter and Eliza Hall Institute researchers to develop new approaches to potentially help people with Prader-Willi syndrome, a devastating and incurable genetic condition.
After 20 years, a patient's family received an answer to a decades-long genetic mystery. Their daughter had two rare disorders, Angelman syndrome and P450scc deficiency, which was detected after researchers found out she had uniparental disomy, two copies of chromosome 15 from one parent and none from another.
Researchers are closer to solving the puzzle of a complex neurological condition called 15q13.3 microdeletion syndrome. Individuals with this condition are missing a small piece of chromosome 15 that usually contains six genes, but which one of the genes is responsible for the clinical characteristics of patients has not been clear.
One often hears about the multitude of genes we have in common with chimps, birds or other living creatures, but such comparisons are sometimes misleading. The shared percentage usually refers only to genes that encode instructions for making proteins -- while overlooking regulatory genes, which nonetheless make up a large part of the genome.
Cigarette smoking accounts for about one-fifth of cases of coronary heart disease, one of the leading causes of death worldwide, but precisely how smoking leads to CHD has long been unclear.
Opitz C syndrome is a genetic disease that causes severe disabilities in patients and has been diagnosed in three people in the Iberian Peninsula, and sixty people in the world.
Duke Health researchers have identified a drug-like small molecule that, in animal experiments, appears to be an effective treatment for a genetic disorder called Prader-Willi syndrome.
Drugs capable of activating silenced genes improve survival and growth outcomes in a mouse model of Prader-Willi syndrome, a rare and incurable childhood disease, according to a study funded by the National Institutes of Health.
Leading scientists have identified an important gene that is associated with cleft lip and palate.Experts say the discovery is a step closer to understanding how this birth defect arises, and will help in the development of medical approaches to prevent the disfiguring condition.
Genes involved in schizophrenia and obesity have been highlighted in a new UCL study, which could lead to a better understanding of the DNA variants which affect risk of these conditions and aid the development of improved strategies for prevention and treatment.
Rhythm announced today the initiation of two Phase 2 clinical trials focused on evaluating the safety and effectiveness of setmelanotide (RM-493), the company's novel melanocortin 4 receptor (MC4R) agonist, for the treatment of Prader-Willi Syndrome (PWS) and POMC-null obesity.
Monitoring participants' biological clocks may be the quickest way to determine the effectiveness of experimental drugs currently under development to treat Angelman syndrome: a debilitating genetic disorder that occurs in more than one in every 15,000 live births.
Most genes are inherited as two working copies, one from the mother and one from the father. However, in a few instances, a gene is imprinted, which means that one copy is silenced. This is called genomic imprinting. If the active copy is mutated, then disease results, even though the silenced gene copy may be normal.
How much is currently known about what happens in the developing brain that puts people at risk of schizophrenia?
Scientists at the Hebrew University of Jerusalem have reported a major breakthrough in understanding the molecular basis for Prader-Willi syndrome (PWS), perhaps the most studied among the class of diseases that involves defects in parental imprinting.
Researchers have found that people born with a rare abnormality of their chromosomes have a 2,700-fold increased risk of a rare childhood leukaemia. In this abnormality, two specific chromosomes are fused together but become prone to catastrophic shattering.
An international research consortium led by investigators at Massachusetts General Hospital (MGH) and the University of Chicago has answered several questions about the genetic background of obsessive-compulsive disorder and Tourette syndrome, providing the first direct confirmation that both are highly heritable and also revealing major differences between the underlying genetic makeup of the disorders.
Researchers with the UC Davis MIND Institute and Agilent Laboratories have found that Prader-Willi syndrome - a genetic disorder best known for causing an insatiable appetite that can lead to morbid obesity - is associated with the loss of non-coding RNAs, resulting in the dysregulation of circadian and metabolic genes, accelerated energy expenditure and metabolic differences during sleep.