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Archive for April, 2009 Monthly Archives

The non-profit X Prize Foundation and private firm Knome are auctioning a whole genome sequence on eBay.  The starting bid is $68,000 and the highest bidder will walk away with a full readout of their gene map, along with a complete interpretation of their genetic details.

There are about 1,600 known genes that influence an individual’s health, and the health of their offspring, according to George Church professor of genetics at Harvard Medical School. Church has worked on the Human Genome Project and is also a co-founder of Knome.

Scientists are hoping to revolutionize modern medical treatment by making genome sequencing a common-place occurrence leading to more individualized medical care and treatment, as well as boosting preventive care to new levels.  Beyond identifying risk of diseases, sequencing can also determine an individual’s potential reaction to certain drugs and tag those which may be ineffective or even toxic.

However exciting these findings may be, predicting disease is a tricky business and, according to researches, there is still much to be understood. Recent studies which suggest that many diseases are the result of variations of several genes, rather than just one gene.  According to David Goldstien, head of the Center for Human Genome Variations at Duke University, much more research needs to be done before genetic testing can be applied to personalized medicine.

See CNN for further information:

http://edition.cnn.com/2009/HEALTH/04/23/genome.ebay/index.html?iref=mpstoryview

Science Daily’s article “Wolf in Dog’s Clothing?” opens the door for new studies in animal genetics and domestication. Scientists have been able to prove that domesticated dogs that bred with wolves thousands of years ago and that this gave wolves a genetic mutation encoding dark coat color.  As a result, the Gray Wolf is no longer just gray.  In addition scientists are reporting that the darker colored wolves have advantages over their lighter pack mates in forested areas. This is leading scientists to believe that these advantages are due to the addition of that domesticated dog DNA.

This study was conducted by Genetics professor Greg Barsh, MD, PhD, and one of his  graduate students, Tovi Anderson, as well as other scientist collaborators.  They compared DNA collected from 41 black, white and gray wolves in the Canadian Arctic and 224 black and gray wolves in Yellowstone National Park with that of domestic dogs and gray and black coyotes.  This study confirmed that the black-coat gene shows evidence of positive selection in forest wolves. It also showed that the gene is dominant, meaning that an animal with only one copy of the gene would still have a black coat. Ten out of fourteen pups conceived by the mating between a black wolf and a gray wolf carried the gene and were black.

Anderson and her collaborators used a variety of genetic tests to determine that the mutation was likely introduced into wolves by domesticated dogs sometime in the last 10,000 to 15,000 years. This was about the same time the first Native American humans were migrating across the Bering land bridge. These humans were probably accompanied by dogs, some of which carried the black-coat mutation estimated to have arisen about 50,000 years ago.

Barsh said, “We were really surprised to find that domestic animals can serve as a genetic reservoir that can benefit the natural populations from which they were derived. It’s also fascinating to think that a portion of the first Native American dogs, which are now extinct, may live on in wolves.”

For the full article see:

http://www.sciencedaily.com­/releases/2009/02/090205142137.htm

(Stanford University Medical Center. “Wolf In Dog’s Clothing? Black Wolves May Be First ‘Genetically Modified’ Predators.” ScienceDaily 6 February 2009. 24 April 2009 <http://www.sciencedaily.com­/releases/2009/02/090205142137.htm>)