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.
Scientists using high-powered microscopes have made a stunning observation of the architecture within a cell - and identified for the first time how the architecture changes during the formation of gametes, also known as sex cells, in order to successfully complete the process.
LifeCodexx today announced the successful completion of the clinical validation study of its noninvasive test method for the detection of fetal trisomy 21 from maternal blood using Next Generation sequencing.
Termed “preimplantation genetic screening (PGS)” the process involves a full chromosome count of embryos to ensure only the healthiest are implanted. It has a 99 per cent accuracy rate, giving hopeful parents the best chance to conceive and carry a healthy baby to term.
Researchers at the Centre for Addiction and Mental Health (CAMH) led a study discovering a gene for a new form of intellectual disability, as well as how it likely affects cognitive development by disrupting neuron functioning.
Huntington disease (HD) is an inherited neurodegenerative disorder caused by a defect on chromosome four where, within the Huntingtin gene, a CAG repeat occurs too many times. Most individuals begin experiencing symptoms in their 40s or 50s, but studies have shown that significant brain atrophy occurs several years prior to an official HD diagnosis. As a result, the field has sought a preventive treatment that could be administered prior to the development of actual symptoms that might delay the onset of illness.
In an important test of one of the first drugs to target core symptoms of autism, researchers at Mount Sinai School of Medicine are undertaking a pilot clinical trial to evaluate insulin-like growth factor (IGF-1) in children who have SHANK3 deficiency (also known as 22q13 Deletion Syndrome or Phelan-McDermid Syndrome), a known cause of autism spectrum disorder (ASD).
Researchers at Johns Hopkins have identified a gene that modifies the risk of newborns with cystic fibrosis (CF) developing neonatal intestinal obstruction, a potentially lethal complication of CF.
The development of more effective cancer drugs could be a step nearer thanks to the discovery, by scientists at Warwick Medical School, of how an inbuilt 'security check' operates to guarantee cells divide with the correct number of chromosomes.
When chromosomes replicate, sometimes there is an exchange of genetic material within a chromosome or between two or more chromosomes without a significant loss of genetic material. This exchange, known as a balanced chromosomal abnormality (BCA), can cause rearrangements in the genetic code.
Researchers at Montefiore Medical Center have identified, in a pilot study published in the April edition of Pediatric Neurology, that children with Rett Syndrome, who cannot speak or use their hands to communicate and therefore were thought to be unable to understand and process information, do in fact exhibit meaningful visual search whereby they can process and prioritize information.
Evolutionary biologists at the University of Toronto have found that individuals with low-quality genes may produce offspring with even more inferior chromosomes, possibly leading to the extinction of certain species over generations.
Two research studies, co-led by UC Davis neurologist Charles DeCarli and conducted by an international team that included more than 80 scientists at 71 institutions in eight countries, has advanced understanding of the genetic components of Alzheimer's disease and of brain development. Both studies appear in the April 15 edition of the journal Nature Genetics.
Researchers at the University of California, Davis have discovered a key tool that helps sperm and eggs develop exactly 23 chromosomes each. The work, which could lead to insights into fertility, spontaneous miscarriages, cancer and developmental disorders, is published April 13 in the journal Cell.
Previous research has shown that Asian patients with lung cancer are more likely to harbor epidermal growth factor receptor (EGFR) mutations. Furthermore, Asian patients with lung cancer are more likely to be non-smokers than Western patients with lung cancer. Research in the May 2012 issue of the International Association for the Study of Lung Cancer's (IASLC) Journal of Thoracic Oncology goes deeper, investigated genetic factors and smoking exposure in Japanese lung cancer patients.
International study that included St. Jude Children's Research Hospital reports some young acute lymphoblastic leukemia patients who fail induction therapy can achieve high cure rates without bone marrow transplantation.
Chromosomes are strands of DNA that contain the blueprint of all living organisms. Humans have 23 pairs of chromosomes that instruct how genes are regulated during development of the human body. While scientists have developed an understanding of the one-dimensional structure of DNA, until today, little was known about how different parts of DNA are folded next to each other inside the nucleus.
Genetics researchers have identified at least two new gene variants that increase the risk of common childhood obesity.
An international team of scientists, led by researchers from the Duke-NUS Graduate Medical School (Duke-NUS) in Singapore and National Cancer Centre of Singapore, has identified hundreds of novel genes that are mutated in stomach cancer, the second-most lethal cancer worldwide.
Researchers have found that there is increasing resistance to the front-line treatments for malaria. A pair of studies published in The Lancet and the journal Science showed how the disease is moving fast into new territory and identified a region of the parasite's genome that may be responsible for mutating in order to survive.
IntegraGen, Inc., a biotechnology company dedicated to molecular biomarker discovery, today announced the launch of the ARISk- Risk Assessment Test, a gender specific, genetic screening test that looks at 65 genetic markers associated with Autism Spectrum Disorder.
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