A B S T R A C T The frequency of HLA-A, B, and Cw antigens as well as the antigens expressed preferentially on B cells and monocytes (DRw and Il-like) was examinied in a normal popuilation alnd two related disease populations, psoriasis and psoriatic arthritis. HLA antigens distinguishing the two disease populations were fouind. Psoriatic patients demonstrated an increase in frequency of HLA-A1, B17, and B13. Patients with psoriatic arthritis demonstrated an increased frequency of HLA-A26, B38, and DRw4. Antigens showing a common increase in frequiency in the two disease populations were HLA-Cw6, DRw7, and la744. These results demonstrate genetic differences as well as similarities in the two populations of patients with the common clinical feature of psoriasis. In addition to the above analysis, we examiined the association of individual alloantigens elevated in frequency in the diseased population. These same alloantigens were examined for association in the normal population. This analysis revealed HLA antigen associations in the two disease groups that differed from the association of several antigens in the normal population.The results suggest that at least two genetic factors, one mapping in the HLA-A, C-B region and one mapping in the HLA-B-DRw region are associated with the disease states. Thus, multiple factors controlled by genes Dr. C. Murray is a Research

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