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.
Researchers funded in part by the National Institutes of Health have identified the gene that accounts for most cases of Goltz syndrome, a rare skin disorder that can also affect bone and eye development.
"Cell division is one of the most fundamental aspects of biology, the process that makes life," says Iain Cheeseman, PhD. "And it has an intrinsic beauty."
Non-invasive screening of pregnant women with ultrasound early in pregnancy, combined with maternal blood analysis, has reduced the number of children born in Denmark with Down Syndrome by 50%, a scientist will tell the annual conference of the European Society of Human Genetics today.
Genes account for only 2.5 percent of DNA in the human genetic blueprint, yet diseases can result not only from mutant genes, but from mutations of other DNA that controls genes.
Their finding is the first to link individual differences written into the genetic code with a vaccine-related complication, albeit a mild one.
Not so long ago, the difficult-to-sequence, highly repetitive, gene-poor DNA found in regions of chromosomes known as heterochromatin was called "junk." Like dark matter in the universe, the true nature of heterochromatin was unknown.
A team of researchers led by University of Virginia Health System geneticists has uncovered a major secret in the mystery of how the DNA helix replicates itself time after time.
The study, published in the July 15th issue of The Journal of Infectious Diseases, now available online, may have implications for predicting adverse events from other live vaccines. .
Investigators at St. Jude Children's Research Hospital have used the lowly yeast to gain insights into how a dividing human cell ensures that an identical set of chromosomes gets passed on to each new daughter cell.
A human cell contains an enormous 1.8 metres of DNA partitioned into 46 chromosomes.
A University of Warwick physicist has uncovered how female cells are able to choose randomly between their two X chromosomes and why that choice is always lucky.
The Wellcome Trust Case Control Consortium, the largest ever study of the genetics behind common diseases such as diabetes, rheumatoid arthritis and coronary heart disease, publishes its results in the journals Nature and Nature Genetics.
Researchers in the Department of Obstetrics, Gynecology & Reproductive Sciences at Yale School of Medicine have identified a new regulatory target for the Fragile X mental retardation protein (FMRP), laying the groundwork for possible new treatments for Fragile X syndrome(FXS), the leading inherited form of mental retardation.
Stem cell biology takes another exciting leap forward as scientists report that normal tissue cells can be reprogrammed to exhibit many of the properties that are characteristic of embryonic stem cells, including the ability to give rise to multiple cell types and contribute to the germline.
Researchers have identified novel genetic mutations that are linked to hereditary diffuse gastric cancer, with these mutations being due to both independent mutational events and common ancestry, according to a study in the June 6 issue of JAMA.
Cloning, X-chromosome inactivation, stem cells, and embryogenesis are hot areas of research at the moment, and protocols featured in this month's release of Cold Spring Harbor Protocols will aid these studies.
Researchers studying the genetics behind why C. difficile causes disease have come to a simple conclusion -- the bacteria do it because they are starving.
New evidence indicates that small pieces of noncoding genetic material known as microRNAs (miRNAs) might influence cancer susceptibility.
Call it the cellular equivalent of big glasses, a funny nose and a fake mustache.
Each year, the parents of an estimated one in 20,000 newborns are shocked to learn their child has type 1 congenital myotonic dystrophy (CDM1), a progressive and crippling genetic disorder.
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