Sixty‐one patients in the Dundee area suffering from psoriasis were typed for HLA—A and HLA—B antigens. On the basis of the typing results, the patients were divided into three groups, and studied with respect to sex, age of onset and familial incidence of the disease. The frequency of HLA—A1 appeared to be increased and HLA—B7 decreased but HLA—B13 and HLA—B17 were highly significantly increased (P < 10−6 and P < 10−10 respectively) in the psoriatic group compared to 204 controls. Of particular interest was a highly significant association of HLA—A1 with HLA—B17 in psoriatic patients. Family studies showed HLA—B17 to be a useful genetic marker for psoriasis in the families of B17 positive patients. Considerations of age of onset, familial incidence and typing data suggest that there is heterogeneity of genetic susceptibility to psoriasis and that one probable mechanism is the dominant inheritance of a “disease allele” in linkage disequilibrium with the allele coding for HLA—B17.
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