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Scientists unmask genetic markers associated with psoriasis
Date:1/25/2009

Ann Arbor, Mich. Scientists at the University of Michigan Department of Dermatology, the U-M School of Public Health and their collaborators have found DNA "hotspots" that may reveal how genetic differences among individuals result in psoriasis, an autoimmune disease of the skin. Published in Nature Genetics, the findings could lead to new drug targets and tailored treatments for the disease.

"This discovery highlights the role of several genes in mediating the immune responses that result in psoriasis," says Goncalo Abecasis, Ph.D., co-principal investigator on the project, and associate professor of biostatistics in the School of Public Health. "Some of the highlighted genes, like those in the IL-23 pathway are already targeted by effective psoriasis therapies. Others, like TNFAIP3 and TNIP1, may become targets for the psoriasis treatments of the future."

Psoriasis affects some 7.5 million people in the United States, causing sore, itchy patches of red, scaly skin. In many cases psoriasis is not only disfiguring; between 10 and 30 percent of patients develop psoriatic arthritis, a painful inflammation of the joints. Current treatments, including different types of immunosuppressive agents, aren't always effective, and they can cause serious side effects.

Psoriasis has a strong genetic component; a child with two affected parents has a 50 percent chance of developing it; siblings have a three- to six-fold risk. But the genes responsible for psoriasis haven't yet been completely understood.

In this large, multi-center study, researchers used cutting-edge genomic technology to identify subtle genetic signals influencing the risk of psoriasis. They scanned millions of DNA variations in the genome to find those that occur significantly more often in psoriasis patients than unaffected people.

The study was led by James Elder, M.D., Ph.D., a professor in the Department of Dermatology, and Abecasis. Among the f
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Contact: Katie Vloet
kgazella@umich.edu
734-764-2220
University of Michigan Health System
Source:Eurekalert

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