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Do specific pockets of HLA-C molecules predispose Jewish patients to psoriasis vulgaris?
A Roitberg-Tambur1, A Friedmann, E E Tzfoni
1Lautenberg Center for General and Tumor Immunology, Hadassah University Hospital, Jerusalem, Israel.
Background:
Psoriasis vulgaris was reported to be associated with a specific alanine residue at position 73 of HLA-C alleles in Japanese patients.
Objective:
Our purpose was to determine the role of HLA genes in susceptibility to psoriasis vulgaris in the Israeli Jewish population.
Methods:
Twenty-eight Israeli patients were analyzed for their HLA class I and II specificities by means of serologic and molecular methods.
Results:
All patients possessed in their HLA-C antigens an alanine residue at position 73 (p < 0.002). A significantly increased frequency of HLA-Cw6 and of Cw7 was also observed among the patients (p < 0.02).
Conclusion:
Our study clearly shows that alanine in position 73 is significantly associated with psoriasis vulgaris in Jewish patients. Cw6 and Cw7 have a unique antigen-binding pocket containing both alanine at position 73 and a negatively charged aspartic acid at position 9. These residues are most probably important in determining the conformation of the C pocket and in turn the nature of the peptide bound to it. We suggest that this combination confers the highest risk of the development of psoriasis vulgaris.