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DNA, or deoxyribonucleic acid, is the hereditary material in humans and almost all other organisms. Nearly every cell in a person’s body has the same DNA. Most DNA is located in the cell nucleus (where it is called nuclear DNA), but a small amount of DNA can also be found in the mitochondria (where it is called mitochondrial DNA or mtDNA).

Scientists discover human genes hover between "on"and "off" in any given cell

Biologists have long thought that a simple on/off switch controls most genes in human cells.

13 Jul 2007

Chemotherapy may benefit all women with a BRCA1 mutation

Breast cancer patients who possess one of the so-called "breast cancer" or BRCA genetic mutations do not have a higher risk of dying than patients with no BRCA mutations, according to a detailed study by researchers at the Technion-Israel Institute of Technology and the University of Toronto.

12 Jul 2007

Sigma-Aldrich launches Imprint DNA Modification kit

Sigma-Aldrich has announced the launch of the Imprint DNA Modification kit.

11 Jul 2007

Kaposi sarcoma tumors arise independently from multiple cells

Kaposi sarcoma is unique among cancers because most tumors grow from a small number of different cells, whereas nearly all other cancers arise from a single cell, according to a study published online July 10 in the Journal of the National Cancer Institute.

11 Jul 2007

Magnetic nano tweezers show how cancer drug works

The annoying bulges of an over-wound telephone cord that shorten its reach and limit a caller's motion help to explain why drugs called camptothecins are so effective in killing cancer cells, according to investigators at St. Jude Children's Research Hospital and Delft University of Technology.

10 Jul 2007

New insights into acute promyelocytic leukemia

Results from two new studies provide key mechanistic insights into the complex molecular events that cause a deadly type of leukemia.

10 Jul 2007

New gene mutation linked to frontotemporal dementia

Researchers have identified a new gene mutation linked to frontotemporal dementia, according to a study published in the July 10, 2007, issue of Neurology, the medical journal of the American Academy of Neurology.

10 Jul 2007

New weapon in the battle against antibiotic-resistant bacteria

Putting bacteria on birth control could stop the spread of drug-resistant microbes, and researchers at the University of North Carolina at Chapel Hill have found a way to do just that.

10 Jul 2007

Neutral genetic drift

Johns Hopkins researchers have added to the growing mound of evidence that many of the genetic bits and pieces that drive evolutionary changes do not confer any advantages or disadvantages to humans or other animals.

10 Jul 2007

Debate on folic acid fortification

Since the institution of nationwide folic acid fortification of enriched grains in the mid 1990s, the number of infants born in the United States and Canada with neural tube defects has declined by 20 percent to 50 percent.

10 Jul 2007

Ownership of genetic information

We all share our genetic make up with relatives, but should we also share ownership of the results of DNA analysis or should this knowledge be considered private?

9 Jul 2007

Scientists discover first common bowel cancer gene

Cancer Research UK funded scientists have for the first time identified a common genetic variant that can increase a person's risk of developing bowel cancer. Their findings appear in two papers published online in Nature Genetics.

9 Jul 2007

New ulcerative colitis gene found

Researchers at The Hospital for Sick Children (SickKids), Mount Sinai Hospital and the University of Pittsburgh have identified a previously unsuspected gene found to be associated with ulcerative colitis.

9 Jul 2007

Ancient DNA suggests earth was warmer than previously believed

A team of international researchers has collected the oldest ever recovered DNA samples and used them to show that Greenland was much warmer at some point during the last Ice Age than most people have believed.

9 Jul 2007

Discovery of enzyme critical in DNA replication

In this week's issue of Science, researchers from the National Institute of Environmental Health Sciences (NIEHS) and Umea University in Sweden report an important discovery about a critical new role that an enzyme called DNA polymerase epsilon plays in replicating DNA in higher organisms such as yeast and perhaps even humans.

9 Jul 2007