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Study identifies genetic risk factor for rheumatoid arthritis, lupus
Date:9/6/2007

hway plays such a crucial role in RA and lupus that new therapies targeting this pathway would be effective in these and perhaps other autoimmune diseases."

One variant form of the gene was present at a significantly higher frequency in RA patient samples from the North American Rheumatoid Arthritis Consortium (NARAC)[1] as compared with controls. The scientists replicated that result in two independent collections of RA cases and controls.

The researchers also found that the same variant of the STAT4 gene was even more strongly linked with lupus in three independent collections of patients and controls. Frequency data on the genetic profiles of the patients and controls suggest that individuals who carry two copies of the disease-risk variant form of the STAT4 gene have a 60 percent increased risk for RA and more than double the risk for lupus compared with people who carry no copies of the variant form. The research also suggests a shared disease pathway for RA and lupus.

"For this complex disease, rheumatoid arthritis, this is the first instance of a genetic linkage study leading to a chromosomal location, which then, in a genetic association study, identified a disease susceptibility gene," says Dr. Gregersen.

The study's success, according to NIAMS Director Stephen I. Katz, M.D., Ph.D., can be attributed in part to the uncommon and longstanding collaboration between NIAMS intramural researchers and other scientists the Institute supports around the country. "This work required the collection and genotyping of thousands of RA and lupus cases and controls, a task that would have been difficult to accomplish without the strong partnerships we forged," he says. NARAC was established 10 years ago by Dr. Gregersen, NIAMS Clinical Director and Genetics and Genomics Branch Chief Daniel Kastner, M.D., Ph.D., and investigators at several academic health centers to facilitate the collection and analysis of RA genetic samples.

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Contact: Ray Fleming
flemingr@mail.nih.gov
301-496-8190
NIH/National Institute of Arthritis and Musculoskeletal and Skin Diseases
Source:Eurekalert

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