Humans normally have 46 chromosomes in each cell, divided into 23 pairs. Two copies of chromosome 9, one copy inherited from each parent, form one of the pairs. Chromosome 9 is made up of about 140 million DNA building blocks (base pairs) and represents approximately 4.5 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 9 likely contains between 800 and 1,300 genes.
Genes on chromosome 9 are among the estimated 20,000 to 25,000 total genes in the human genome.
Biologists have developed an efficient way to genetically modify human embryonic stem cells. Their approach, which uses bacterial artificial chromosomes to swap in defective copies of genes, will make possible the rapid development of stem cell lines that can both serve as models for human genetic diseases and as testbeds on which to screen potential treatments, they say.
A collaboration between the University of Massachusetts Medical School, the Cummings School of Veterinary Medicine at Tufts University and the Broad Institute at the Massachusetts Institute of Technology has identified a genetic locus on canine chromosome 7 which coincides with an increased risk of obsessive compulsive disorder (OCD) susceptibility.
Each cell inherits genes from its parent as well as epigenetic information - what amounts to an instruction manual that specifies which genes should be activated or "expressed," when and to what level.
A new strategy that researchers believe provides a more comprehensive screening of the entire chromosomal makeup of an embryo shows tremendous promise in the field of preimplantation genetic screening (PGS) according to a study published in the December issue of Fertility and Sterility.
The National Fragile X Foundation applauds the United States Congress and President Barack Obama for including Fragile X Syndrome for the first time ever within a select group of conditions eligible for research funding from the U.S. Department of Defense.
La Jolla, CA-In order to preserve our DNA, cells have developed an intricate system for monitoring and repairing DNA damage. Yet precisely how the initial damage signal is converted into a repair response remains unclear. Researchers at the Salk Institute for Biological Studies have now solved a crucial piece of the complex puzzle.
The year 2009 will be remembered as a year of many firsts for lupus, including the first successful phase III clinical trial of a potential new treatment for lupus, the launch of the first-ever Ad Council public awareness campaign for lupus, and the first comprehensive report on the barriers to lupus drug development. And it appears there are no signs of any slowing of momentum as we enter the New Year.
Pediatric researchers have identified a novel gene involved in childhood asthma, in one of the largest gene studies to date of the common respiratory disease. Because the gene, called DENND1B, affects cells and signaling molecules thought to be instrumental in the immune system overreaction that occurs in asthma, the discovery may have singled out an important target for new treatments.
The first detailed search of breast cancer genomes to uncover genomic rearrangements is published today. The team characterised the ways in which the human genome is broken and put back together in 24 cases of breast cancer.
Researchers from Children's Hospital Boston and Brigham and Women's Hospital have identified an important genetic cause of a devastating kidney disease that is the second leading cause of kidney failure in children, according to The NephCure Foundation.
Doctors and researchers from the John Theurer Cancer Center at Hackensack University Medical Center recently presented research updates and clinical trial results of more than 20 innovative studies at the American Society of Hematology (ASH) annual meeting from December 5-8, 2009.
Howard Hughes Medical Institute researchers have identified a naturally occurring human protein that helps prevent infection by H1N1 influenza and other viruses, including West Nile and dengue virus.
Researchers from the UC San Diego, School of Medicine and colleagues have identified a new gene, ETS-1, that is linked to human congenital heart defects. The landmark study, recently published online in the journal of Human Molecular Genetics, provides important insights into some of the most prevalent forms of congenital heart defects in humans, including ventricular septal defects and potentially hypoplastic left heart syndrome, a uniformly fatal heart abnormality.
Research from the Babraham Institute has revealed for the first time that genes work together by huddling in clusters inside the nucleus - the information centre of a cell. These findings, published in the online edition of the journal Nature Genetics, represent a paradigm shift in our understanding of how the genome is spatially organised in relation to gene expression.
Genomic Health, Inc. today announced results from five new studies on its Oncotype DX® breast cancer test, a multi-gene expression test that physicians currently use to predict the likelihood of chemotherapy benefit and recurrence risk for patients with early-stage breast cancer.
Is it a boy or a girl? Expecting parents may be accustomed to this question, but contrary to what they may think, the answer doesn't depend solely on their child's sex chromosomes.
Researchers have discovered a new explanation for differences in the severity of mental illness in males. The more excess copies of a certain gene, the more serious the handicap. The genetic defect is situated on the X-chromosome; and it is suspected that it is the amount of copies of the GDI1 gene that is responsible.
In a large Phase III clinical trial, Tasigna (nilotinib capsules) demonstrated greater efficacy over Gleevec (imatinib) in the treatment of adult patients with newly diagnosed Philadelphia chromosome-positive chronic myeloid leukemia (Ph+ CML) in chronic phase. The new clinical data were just presented as a late breaking abstract at the 51st annual meeting of the American Society of Hematology (ASH), in New Orleans, Louisiana.
Enzo Biochem, Inc. announced today that its Enzo Clinical Lab division has entered into an exclusive marketing partnership covering the States of New York and New Jersey with privately-owned Ikonisys, Inc., of New Haven, CT, relating to Ikonisys’ proprietary oncoFISH® cervical test, a laboratory developed test for cervical cancer prevention.
In a large clinical trial, nilotinib demonstrated greater efficacy over the current gold standard treatment, imatinib, in adult patients with newly diagnosed Philadelphia chromosome-positive chronic myeloid leukaemia (Ph+ CML) in the chronic phase.
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