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PostPosted: Mon May 14, 2007 9:18 pm 
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Studies Uncover Genes Boosting Type 2 Diabetes Risk

(HealthDay News) -- Scientists have found several new genes that appear to increase the risk for developing type 2 diabetes.

Researchers say these findings bring to 10 the number of genes suspected in increasing the odds for type 2 diabetes, the most common, obesity-linked form of the disease. Understanding how these genes contribute to the disorder may lead to new strategies for prevention and treatment. The studies appear in the April 26 online editions of Nature Genetics and Science.

"This is clearly a start in understanding the disease," said Dr. Larry Deeb, president for medicine and science at the American Diabetes Association. "Type 2 diabetes is multifactorial, there is not one gene associated with it, and yet we know it runs in families, so it has to be genetic."

Deeb is not sure how much the genetic risk adds to the propensity for developing the disease. Either having or not having the genetic risk is not a guarantee of getting or not getting the disease, he added.

"What society has to do to prevent type 2 diabetes is so non-medical -- diet and exercise," Deeb said. "These are the things we know people should do."

In the first paper in Nature Genetics, a team led by Dr. Kari Stefansson, CEO of deCODE Genetics, report on a new genetic risk factor for type 2 diabetes.

The researchers conducted a large survey in Iceland comparing the frequencies of several hundred thousand common genetic variants in healthy people against those who have the disease.

They found that the CDKAL1 gene was associated with type 2 diabetes. "It affects the secretion of insulin," Stefansson said. "So people with this variant secrete less insulin in response to glucose than people in the general population."

In addition, they saw the same association between type 2 diabetes and a variant in the CDKAL1 gene in other populations of Europeans and Han Chinese.

According to Stefansson, people with two copies of the risk variant were found to face a 50 percent increased risk of developing the disease when compared with people with only a single copy of the gene variant. About 25 percent of the population has this variant, Stefansson said.

People with two copies of the gene variant produce about 20 percent less insulin in response to rising blood sugar than those with only one copy or non-carriers. This suggests that the variant increases the risk for type 2 diabetes by reducing insulin production.

Stefansson's company has developed a test to identify people with the gene variant. Their hope is to be able to identify people at risk for type 2 diabetes so that they can be counseled to make lifestyle changes or started on medication before the condition develops.

Deeb isn't sure of the value of this testing, however. "If it motivates someone to change their lifestyle it could be a good thing," he said.

In the papers published in Science, three groups of researchers, from the Broad Institute of Harvard and MIT, Lund University in Sweden, and the pharmaceutical company Novartis, have identified three new gene regions linked to type 2 diabetes.

In addition to confirming several gene variants previously tied to type 2 diabetes, the researchers found three new variants -- CDKN2A and CDKN2B -- lying on chromosome 9, and IGF2BP2 on chromosome 3, that are also linked to the disease.

"We are now able to confidently identify genetic risk factors for type 2 diabetes," said Michael Boehnke, the Richard G. Cornell Collegiate Professor of Biostatistics at the University of Michigan, and coauthor of one of the Science papers.

At least 10 gene variants have now been linked to type 2 diabetes, each exerting a modest effect on risk. The list will likely continue to grow, while the current genes that have been pinpointed provide a valuable starting point for understanding the disease.

"These genes are not telling the entire genetic story of type 2 diabetes," Boehnke cautioned. "This is a small part of the overall picture, which includes environment and behavioral factors."

However, he added, knowing the genetics of type 2 diabetes could lead to new targeted therapies.

The findings have implications for medical research in general, another expert said.

"For the first time, it is possible to look across the human genome and discover new clues about the root causes of common, devastating diseases that arise from a combination of genes, environment and behavior," study co-author David Altshuler, director of the Broad Institute's Program in Medical and Population Genetics and an associate professor of genetics at Massachusetts General Hospital and Harvard Medical School, said in a prepared statement. "The confirmed genetic contributors we and our collaborators have found open surprising new avenues for disease research, treatment and prevention."

Type 2 diabetes is the most common form of diabetes. The condition affects more than 170 million people worldwide and experts say its prevalence is rapidly increasing. Your chance of developing the disorder is governed by a combination of lifestyle and hereditary factors.

More information

For more information on type 2 diabetes, visit the American Diabetes Association.


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PostPosted: Sat Jan 03, 2009 9:30 pm 
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more information about diabetes: http://www.dreddyclinic.com/findinformation/dd/diabetes.php



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PostPosted: Mon Oct 10, 2011 5:37 pm 
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PostPosted: Mon May 26, 2014 6:14 am 
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AyurGold Herbal Supplement for Blood Sugar Levels http://bit.ly/O90CCg

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