Are HLA class II genes controlling susceptibility and resistance to Brazilian pemphigus foliaceus (fogo selvagem)?

Tissue Antigens
M L Petzl-Erler, J Santamaria

Abstract

In order to investigate the possible association between Brazilian pemphigus foliaceus and HLA, we studied 48 patients and 74 matched controls, all Brazilian Caucasoids, for HLA-A,B,C; DR1 to DRw8 and DQw1 to DQw3. The frequencies of DR1, DR4 and B16 were significantly increased, while DR7 was significantly decreased among the patients. Furthermore DQw2, likewise the DR specificities associated with it - DR3 and DR7 - never occurred among the patients in the absence of the susceptibility markers DR1, DQw1 or DR4, DQw3. Acting on these findings, we suggest that at least two MHC-class II genes are involved in the pathogenesis of Brazilian pemphigus foliaceus: at least one gene, associated to DR1,DQw1 and to DR4,DQw3, confers susceptibility and at least one gene, associated to DR7,DQw2 and DR3,DQw2, confers resistance. The susceptibility gene(s) seem(s) to be epistatic to or dominant over (if allelic) the resistance gene(s). Both are dominant over other alleles at their locus (or loci).

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