Navigation Links
Scientists map out regulatory regions of genome, hot spots for diabetes genes
Date:2/2/2010

CHAPEL HILL Together with colleagues in Barcelona, researchers at the University of North Carolina at Chapel Hill have generated a complete map of the areas of the genome that control which genes are "turned on" or "off." The discovery, made in pancreatic islet cells, opens new avenues for understanding the genetic basis of type 2 diabetes and other common illnesses.

"Most of the human genome is uncharted territory entire stretches of sequence with no clear function or purpose," said Jason Lieb, Ph.D., associate professor of biology at UNC, a member of the UNC Lineberger Comprehensive Cancer Center and one of the senior authors of the study. "In fact, the majority of the DNA sequences associated with disease found thus far reside in the middle of nowhere. Here we have developed a map that can guide scientists to regions of the genome that do appear to be functionally relevant, instead of a dead end."

The research, published online Jan. 31, 2010, in the journal Nature Genetics, presents the first high-resolution atlas of these regulatory elements in the most studied cell type for treatment and prevention of type II diabetes.

The completion of the human genome project has spurred a flurry of research into the exact genetic changes underlying disease. But while these studies have discovered thousands of sequences associated with human illness, pinpointing which sequence variations are the true culprits has proven difficult. That is because the underlying genetic sequence the A, C, T, and G that code for your entire being is only part of the story. It is not just the message, but the packaging whether those four letters are laid out like an open book or tightly packaged like a message in a bottle that determine which genes are active and which are not.

Using a new method developed in the Lieb laboratory called FAIRE-seq, Lieb and his colleagues isolated and sequenced a total of 80,000 open chromatin sites within pancreatic islet cells. They then compared these sites to those in non-islet cells to narrow the number down to 3,300 clusters of sites specific to this cell type. Each cluster typically encompassed single genes that are active specifically in islet cells. Twenty of these genes are known to harbor gene variants associated with type II diabetes.

The researchers decided to continue their studies on the variant most strongly associated with the disease, a single nucleotide polymorphism or SNP occurring in the TCF7L2 gene. They found that the chromatin is more open in the presence of the high risk version of the gene (a T) than in the presence of the non-risk version (an A). Further analysis demonstrated that the risk variant enhanced the activity of the gene, indicating that it may possess functional characteristics that could contribute to disease.

Lieb says his map is likely to help others within the diabetes research community identify new targets for understanding and ultimately treating the disease more effectively. But the approach is not limited to diabetes, or even pancreatic islet cells. He plans to use FAIRE-seq to chart the open chromatin regions present within other cells, such as the immune system's lymphocytes.


'/>"/>

Contact: Tom Hughes
tahughes@unch.unc.edu
919-966-6047
University of North Carolina School of Medicine
Source:Eurekalert  

Related medicine news :

1. New prion protein discovered by Canadian scientists may offer insight into mad cow disease
2. Scientists Probe Sepsis Deadly Secrets
3. Scientists puzzled by severe allergic reaction to cancer drug in the middle Southern US
4. Scientists Develop Natural Protection for Stored Foods
5. Scientists detect presence of marburg virus in african fruit bats
6. Scientists Spot Brains Free Will Center
7. Scientists ID Likely Culprit in Popcorn Lung
8. Scientists explain how insulin secreting cells maintain their glucose sensitivity
9. Scripps Research scientists shed new light on how antibodies fight HIV
10. Scientists, physicians present latest findings in personalized cancer treatment and prevention
11. Scientists demonstate link between genetic variant and effectiveness of smoking cessation meds
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Scientists map out regulatory regions of genome, hot spots for diabetes genes
(Date:5/26/2017)... ... 26, 2017 , ... Amir Qureshi, MD is the first physician in Arkansas ... stimulation system. The Nuvectra™ Algovita SCS System has been FDA approved as a treatment ... in Arkansas to introduce the most powerful SCS system and the only stretchable lead ...
(Date:5/26/2017)... ... May 26, 2017 , ... On May 24, the ... narrowly passed the U.S. House on May 4, would result in 23 million Americans ... continued implementation of the 2010 Patient Protection and Affordable Care Act (ACA). , ...
(Date:5/26/2017)... ... May 26, 2017 , ... Dr. Alex Rabinovich, a ... announce a new, informational blog post on insurance options. If a Bay Area patient ... may help save time and money. Visiting an in-network provider for a second opinion ...
(Date:5/26/2017)... , ... May 26, 2017 , ... “Cactus Jack: Against ... on so many others. “Cactus Jack: Against All Odds” is the creation of ... Walter D. Hubbard is married to Jack Carlisle’s third child Jane. Walter. Walter ...
(Date:5/24/2017)... Hills, CA (PRWEB) , ... May 24, 2017 , ... ... announced today its participation in nVerge 2017 – a one-day technology conference in San ... Altec’s document management solution, which allows users to fully utilize and enhance their Sage ...
Breaking Medicine News(10 mins):
(Date:5/10/2017)... 10, 2017  The Corporate Whistleblower Center says, ... sleep therapy clinics to call us anytime at ... is involved in a substantial scheme to overbill ... from an employee of a medical equipment company ... to provide medical practice groups with extra generous incentives ...
(Date:5/9/2017)... , May 9, 2017  Oramed Pharmaceuticals ... ), a clinical-stage pharmaceutical company focused on the ... that the Canadian Intellectual Property Office has granted ... Oral Administration of Exenatide". The patent covers Oramed,s ... GLP-1 is an incretin hormone that ...
(Date:5/6/2017)... , May 5, 2017  May is Stroke ... one of the most important methods to prevent a ... the Centers for Disease Control and Prevention, undetected and ... 1 Omron, the global leader in personal heart ... the elimination of heart attack and stroke and is ...
Breaking Medicine Technology: