Chromosome Y News and Research

RSS

The Y chromosome is one of the two sex chromosomes in humans (the other is the X chromosome). The sex chromosomes form one of the 23 pairs of human chromosomes in each cell. The Y chromosome spans about 58 million base pairs (the building blocks of DNA) and represents almost 2 percent of the total DNA in cells.

Each person normally has one pair of sex chromosomes in each cell. The Y chromosome is present in males, who have one X and one Y chromosome, while females have two X chromosomes.

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. The Y chromosome likely contains between 70 and 200 genes. Because only males have the Y chromosome, the genes on this chromosome tend to be involved in male sex determination and development. Sex is determined by the SRY gene, which is responsible for the development of a fetus into a male. Other genes on the Y chromosome are important for male fertility.

Many genes are unique to the X or Y chromosome, but genes in an area known as the pseudoautosomal region are present on both chromosomes. As a result, men and women each have two functional copies of these genes. Many genes in the pseudoautosomal region are essential for normal development.

Genes on the Y chromosome are among the estimated 20,000 to 25,000 total genes in the human genome.

Common ADHD drugs do not cause genetic damage in children

In contrast to recent findings, two of the most common medications used to treat attention deficit hyperactivity disorder (ADHD) do not appear to cause genetic damage in children who take them as prescribed, according to a new study by researchers at the National Institutes of Health (NIH) and Duke University Medical Center.

19 Nov 2008

Scientists discover new compounds to target muscular dystrophy

Using a drug-discovery technique in which molecules compete against each other for access to the target - the strand of toxic RNA that causes the most common form of muscular dystrophy in adults - a team at the University of Rochester Medical Center has identified several compounds that, in the laboratory, block the unwanted coupling of two molecules that is at the root of the disease.

19 Nov 2008

Link found between cryptorchidism and genetic mutations

A small percentage of males born with cryptorchidism (failure of one or both testicles to descend into the scrotum), the most frequent congenital birth defect in male children, are more likely to have genetic mutations, including for a syndrome that is a common genetic cause of infertility, according to a study in the November 19 issue of JAMA .

18 Nov 2008

Microarray analysis improves prenatal diagnosis

A "chip" or array that can quickly detect disorders such as Down syndrome or other diseases associated with chromosomal abnormalities proved an effective tool in prenatal diagnosis in a series of 300 cases at Baylor College of Medicine, said researchers in a report that appears in the current issue of the journal Prenatal Diagnosis.

17 Nov 2008

Protein enzyme BubR1 provides new understanding of processes behind cancer-cell survival and drug-resistance

A study of how one protein enzyme, BubR1, helps make sure chromosomes are equally distributed during mitosis might explain how the process of cell division goes so awry in cancer, according to researchers from Fox Chase Cancer Center.

17 Nov 2008

Astragalus root plant chemical used to fight HIV

Like other kinds of cells, immune cells lose the ability to divide as they age because a part of their chromosomes known as a telomere becomes progressively shorter with cell division.

11 Nov 2008

Newborn neurons in the adult brain can settle in the wrong neighborhood

In a study that could have significant consequences for neural tissue transplantation strategies, researchers at the Salk Institute for Biological Studies report that inactivating a specific gene in adult neural stem cells makes nerve cells emerging from those precursors form connections in the wrong part of the adult brain.

11 Nov 2008

Data expands the clinical utility of deCODE tests for heart attack, atrial fibrillation and stroke

Several presentations by deCODE genetics scientists and independent researchers at the American Heart Association Scientific Sessions 2008 being held at the New Orleans Convention Center from November 8 to12 are expected to expand upon the clinical utility of evaluating individual risk of heart attack, or atrial fibrillation and stroke, respectively, by measuring the genetic markers that are the basis of the deCODE MI and deCODE AF tests.

11 Nov 2008

Researchers discover genetic basis for some common congenital birth defects

10 Nov 2008

Absence of ERK2 gene linked to birth defects

A multidisciplinary research team at Case Western Reserve University led by Gary Landreth, Ph.D., a professor in the School of Medicine's Department of Neurosciences, has uncovered a common genetic pathway for a number of birth defects that affect the development of the heart and head. Abnormal development of the jaw, palate, brain and heart are relatively common congenital defects and frequently arise due to genetic errors that affect a key developmental pathway.

10 Nov 2008

Researchers unravel mysteries of brain aneurysms

Yale researchers have taken the first critical steps in unraveling the mysteries of brain aneurysms, the often fatal rupturing of blood vessels that afflicts 500,000 people worldwide each year and nearly killed Vice President-elect Joseph Biden two decades ago.

10 Nov 2008

Variations of MYH9 gene help explain high rate of kidney disease in African Americans

Several recent studies have suggested that common gene variations may be responsible for much of the elevated risk of kidney disease in African Americans.

8 Nov 2008

Coping and copulation behavior may help calculate diabetes risk

Discussion of a man's background, attitude, and sexual history isn't just the fodder of Sex and The City episodes - in the future, it could also be a way of evaluating his risk of diabetes.

7 Nov 2008

Targeting epigenetic changes helps tackle MLL-AF4 leukemias

A very difficult-to-treat child leukemia may benefit from the discovery of a small but potent epigenetic change that launches the cancer - but could potentially be reversed relatively easily, preventing cancer-promoting genes from being turned on.

4 Nov 2008

Sibling study could lead to better treatments for inherited form of colon cancer

Researchers at Huntsman Cancer Institute (HCI) believe they may be one step closer to understanding how certain forms of colon cancer develop.

4 Nov 2008

First gene for child brain tumour identified

Scientists have found the first genetic link to a common childhood brain tumour - reveals research published in Cancer Research.

3 Nov 2008

New genetic test for baldness

Pharmacogenomics research and development innovator PharmaGenoma, Inc. and its subsidiary HairDX, LLC, today unveiled the next generation of its genetic screening test for male pattern baldness. The HairDX test is available immediately thru qualified physicians' offices.

28 Oct 2008

Universal test for genetic diseases in unborn children in the pipeline

A team of British scientists have developed a ground-breaking new test to screen for genetic diseases in unborn children.

27 Oct 2008

Newly discovered mechanism can explain the Beckwith-Wiedemann syndrome

Researchers from Uppsala University have discovered a mechanism that silences several genes in a chromosome domain. The findings, published in today's on-line issue of Molecular Cell, have implications in understanding the human disorder Beckwith-Wiedemann syndrome.

26 Oct 2008

A new role for a critical DNA repair molecule in the immune system

The human immune system is a brilliantly adaptable weapon against foreign invaders. But it all depends on the work of specialized cells called lymphocytes that have made a risky evolutionary gambit to mutate their own DNA.

26 Oct 2008