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Genes and their regulatory 'tags' conspire to promote rheumatoid arthritis
Date:1/20/2013

In one of the first genome-wide studies to hunt for both genes and their regulatory "tags" in patients suffering from a common disease, researchers have found a clear role for the tags in mediating genetic risk for rheumatoid arthritis (RA), an immune disorder that afflicts an estimated 1.5 million American adults. By teasing apart the tagging events that result from RA from those that help cause it, the scientists say they were able to spot tagged DNA sequences that may be important for the development of RA. And they suspect their experimental method can be applied to predict similar risk factors for other common, noninfectious diseases, like type II diabetes and heart ailments.

In a report published in Nature Biotechnology Jan. 20, the researchers at Johns Hopkins and the Karolinska Institutet say their study bridges the gap between whole-genome genetic sequencing and diseases that have no single or direct genetic cause. Most genetic changes associated with disease do not occur in protein-coding regions of DNA, but in their regulatory regions, explains Andrew Feinberg, M.D., M.P.H., a Gilman scholar, professor of molecular medicine and director of the Center for Epigenetics at the Johns Hopkins University School of Medicine's Institute for Basic Biomedical Sciences. "Our study analyzed both and shows how genetics and epigenetics can work together to cause disease," he says.

Rheumatoid arthritis is a debilitating disease that causes inflammation, stiffness, pain and disfigurement in joints, especially the small joints of the hands and feet. It is thought to be an autoimmune disease, meaning that the body's immune system attacks its own tissues, an assault led primarily by white blood cells. According to Feinberg, several DNA mutations are known to confer risk for RA, but there seem to be additional factors that suppress or enhance that risk. One probable factor involves chemical "tags" that attach to DNA sequences, part of a so-ca
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Contact: Catherine Kolf
ckolf@alumni.nd.edu
443-287-2251
Johns Hopkins Medicine
Source:Eurekalert  

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