HLA-E*0103X is associated with susceptibility to Pemphigus vulgaris

Non-classical human leucocyte antigen-E (HLA-E) mediates natural killer and CD8+ T-cell activity, suggesting a role in the regulation of autoimmunity. HLA-E*0103X/*0103X has been associated with Behcet's disease and HLA-E *0101/*0103X with childhood onset diabetes. We investigated HLA-E allele status in 52 Caucasian and Ashkenazi Jewish Pemphigus vulgaris (PV) patients and 51 healthy controls by restriction fragment length polymorphism-polymerase chain reaction and amplification refractory mutation system. Associations were determined via chi-square test, Fisher's exact test and logistical regression analysis. HLA-E outcomes included presumed homozygous *0101/*0101 or *0103X/*0103X genotype status or *0101/*0103X heterozygous status. PV did not significantly associate with either *0101/*0101 or *0101/*0103X genotypes. HLA-E*0103X/*0103X (presumed homozygote) is significantly increased in patients with PV versus controls (P = 0.0146, OR = 3.730, 95%CI = 1.241-11.213). Our data provide the first evidence that HLA-E*0103X is a marker for genetic risk in PV.