Humans normally have 46 chromosomes in each cell, divided into 23 pairs. Two copies of chromosome 7, one copy inherited from each parent, form one of the pairs. Chromosome 7 spans about 159 million DNA building blocks (base pairs) and represents more than 5 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 7 likely contains about 1,150 genes.
Genes on chromosome 7 are among the estimated 20,000 to 25,000 total genes in the human genome.
Research by Jue Wang, MD, at the University of Arizona Cancer Center at Dignity Health St. Joseph's Hospital and Medical Center on "Delay in Diagnosis of Testicular Cancer in a Patient with Down Syndrome" was published in the October issue of Journal of Cancer and Therapeutic Science.
Our genomes help to determine who we are - the countless variations between individuals that encode the complexity of tissues and functions throughout the body.
They call it the "hairy ball." It's an unflattering name for two-dimensional representations of a complex biological network, a depiction of a system of linkages and connections so complex and dense that "it looks like a big mess," said Dmitry Korkin, PhD, associate professor of computer science at Worcester Polytechnic Institute and director of the university's bioinformatics and computational biology program.
Scientists from Trinity College Dublin and the Royal College of Surgeons in Ireland have discovered that abnormalities of blood vessels in the brain may play a major role in the development of schizophrenia, a debilitating condition that affects around 1% of people in Ireland.
For the first time, Whitehead Institute scientists have documented a direct link between deletions in two genes--fam57ba and doc2a--in zebrafish and certain brain and body traits, such as seizures, hyperactivity, enlarged head size, and obesity.
Preeclampsia is the most dangerous form of hypertension during a pregnancy and can be fatal for both mother and child. Though it is known to originate in the placenta, the root causes remain largely a mystery.
A new combination of existing drugs has been shown to block the cancer gene behind a fatal form of glandular cancer, adenoid cystic carcinoma. The findings from the Sahlgrenska Academy can lead to new treatment for patients with this disease relatively soon.
Pediatric researchers investigating the childhood cancer neuroblastoma have identified common gene variants that raise the risk of an aggressive form of that disease. The discovery may assist doctors in better diagnosing subtypes of neuroblastoma.
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.
The notorious genetic marker of Alzheimer's disease and other forms of dementia, ApoE4, may not be a lone wolf.
For the last two decades, researchers worldwide have been using whole genome sequencing to understand what makes cells radiation-resistant, hoping to solve an old biological mystery: why is it that one of the most radiation-resistant organisms, Deinococcus radiodurans, aka "Conan the bacterium," can survive hundreds of times more DNA damage caused by gamma rays than most other organisms? According to a study published recently in Standards of Genomic Sciences by researchers at the Uniformed Services University (USU), the amount of radiation a Deinococcus cell can survive in fact has little to do with the number and types of its DNA repair proteins.
A team of researchers led by a bioinformatician at the University of California San Diego has developed a method to help determine whether certain hard-to-study mutations in the human genome, called short tandem repeats or microsatellites, are likely to be involved in harmful conditions.
Researchers from the Perelman School of Medicine at the University of Pennsylvania have made a discovery about muscular dystrophy disorders that suggest new possibilities for treatment.
Each cell in the average human body contains 23 pairs of chromosomes, with four telomeres on each pair. Telomeres cover the end of the chromosome, protecting it from deterioration or fusion with adjacent chromosomes, much like the plastic tip at the end of a shoelace protects it from unraveling.
A better understanding of the cause of autism may come from an unlikely source, neurological studies of the fruit fly.
Schizophrenia is a complicated disease that often appears in early adulthood. Although scientists have not traced the genetic causes, more than 80% of schizophrenia cases are considered to have a hereditary cause.
A fertilized human egg develops into multiple tissues, organs and about 200 distinct cell types. Each cell type has the same genes, but they are expressed differently during development and in mature cells.
An international study of integrated HHV-6 has discovered that a small number of human ancestors, one from about 24,000 years ago, have been responsible for transmitting ancient strains of the virus to individuals today - affecting about a million people in the UK alone.
A study by the University of Warwick sheds new light on gene fusion in bladder and brain cancer.
Biological "detectives" are tracking down biothreats such as the bacteria that causes tularemia ("rabbit fever"), but they constantly face the challenge of avoiding false positives.