Genetic Analysis of Psoriasis and Psoriatic Arthritis

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT00341809
Recruitment Status : Completed
First Posted : June 21, 2006
Last Update Posted : April 5, 2018
Information provided by:
National Institutes of Health Clinical Center (CC)

Brief Summary:

This study will examine the genetic basis of psoriasis and psoriatic arthritis. It is known that genes play an important role in determining who gets psoriasis or psoriatic arthritis. This study will look for specific gene variants (alleles) that run in families with these conditions, or are found more often in people with these conditions than in those without them.

Participants for this study were identified through the dermatology services of the University of Michigan Medical Center, the Ann Arbor Veterans Affairs Medical Center, the University of Kiel, and Henry Ford Hospital. Additional families were provided by the National Psoriasis Foundation Tissue Bank. They include people with psoriasis or psoriatic arthritis, or both, in addition to some family members of patients. Only families in which the age of the patient at disease onset was below 40 years are included. Patients were included if they had lesions covering more than 1 percent of their total body surface area or if at least two skin, scalp, nail, or joint lesions were diagnosed as psoriasis. Healthy volunteers are also enrolled as control subjects.

Participants undergo the following procedures, as follows:

Patients with psoriasis and people without psoriasis who have multiple family members with the disease

  • Skin evaluation
  • Photographs of lesions for documentation

Patients with psoriatic arthritis and people without psoriatic arthritis who have multiple family members with the disease

  • Joint evaluation and possibly ultrasound
  • Joint X-rays or review of existing X-rays

Patients with psoriasis only, with psoriatic arthritis, and healthy volunteers

  • Blood draw of 30 milliliters. Some of the blood collected will be used to test for rheumatoid factor and C-reactive protein in patients with psoriatic arthritis.
  • Periodic questionnaires to update health status information

Condition or disease

Detailed Description:

The aim of the study is to examine the role of HLA and killer immunoglobulin-like receptors (KIR) in the natural history of psoriasis vulgaris. Psoriasis is a chronic inflammatory disease of the skin with features of an autoimmune disease, and previous studies have revealed an association with certain HLA class I alleles, notably HLA-Cw*0602. Natural Killer (NK) cells are a unique group of lymphocytes involved in surveillance of killing of foreign or infected cells through a mechanism involving recognition of HLA class I molecules by an extremely diverse set of receptors on the NK cell surface. A major group of these receptors are the KIRs. Thus, a relationship between KIR/HLA genotype and psoriasis is biologically plausible, and indeed previous data from our laboratory have shown a strong association with the activating genes KIR2DS1 and KIR2DS2 and development of psoriatic arthritis, a well-recognized complication of psoriasis.

Dr. James Elder and colleagues at the University of Michigan have identified a cohort of more than 560 families through the dermatology services of the University of Michigan Medical Center, the University of Kiel, Henry Ford Hospital, and the National Psoriasis Foundation Tissue Bank. Individuals have been well characterized clinically, and information on race, ethnicity, age at onset, current age, and history of inflammatory bowel disease and/or other autoimmune disorders has been obtained. The large size of the cohort will provide substantial statistical power, which is of major importance in any KIR/HLA association study.

Study Type : Observational
Actual Enrollment : 2653 participants
Official Title: Role of HLA and KIR in the Natural History of Psoriasis
Study Start Date : July 30, 2004
Study Completion Date : September 4, 2012

Resource links provided by the National Library of Medicine

MedlinePlus related topics: Psoriasis
U.S. FDA Resources

Information from the National Library of Medicine

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Ages Eligible for Study:   1 Year and older   (Child, Adult, Senior)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

DNA and relevant clinical data from properly consented subjects will be provided to the LGD for genotyping and analysis. No available subjects will be excluded.

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT00341809

United States, Michigan
University of Michigan
Ann Arbor, Michigan, United States, 48109-0624
Sponsors and Collaborators
National Cancer Institute (NCI)
Principal Investigator: Michael Dean, Ph.D. National Cancer Institute (NCI)

Publications: Identifier: NCT00341809     History of Changes
Other Study ID Numbers: 999904255
First Posted: June 21, 2006    Key Record Dates
Last Update Posted: April 5, 2018
Last Verified: September 4, 2012

Keywords provided by National Institutes of Health Clinical Center (CC):
Natural Killer Cells
Autoimmune Disease
Chronic Inflammation
Two-Locus Interaction
Allele/Haplotype Analysis

Additional relevant MeSH terms:
Skin Diseases, Papulosquamous
Skin Diseases