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Genetic Analysis of Psoriasis and Psoriatic Arthritis (GAPPA)


Psoriasis is a chronic skin condition with genetic and immunologic aspects. About 20% of psoriasis patients also develop an inflammatory joint condition called psoriatic arthritis. The program seeks to find the genes responsible for psoriasis and psoriatic arthritis. Patients living anywhere in the United States can participate in the study. It is not necessary to have a family history of psoriasis. A blood sample is required, which may be obtained at a clinical lab or a physician’s office. Travel to Ann Arbor is not required for participation in this research. Controls subjects with no personal or family history of psoriasis are also welcome to participate.

Contact Information

James T. Elder, MD, PhD

Psoriasis Genetics Laboratory
Department of Dermatology
7421 Midical Science Building I
1301 East Catherine St.
Ann Arbor, MI 48109-5675

Phone: 800-356-2840
E-mail: rnair@umich.edu

Visit the Program on the Web at:


The program is primarily a(n):

Research Program

Program End Date


Sponsoring Service Unit(s)

Medical School

Sponsoring Department(s)

Department of Dermatology

Program Available to these Counties


Program Available to these Cities

Ann Arbor

Subject Area(s)

Health & Health Care, Science & Research