Allelic basis for HLA-encoded susceptibility to type 1 autoimmune hepatitis

Gastroenterology
M D StrettellR Williams

Abstract

In a recent study, we suggested that susceptibility to type 1 autoimmune hepatitis is associated with a six-amino acid motif, LLEQKR, within the DR beta polypeptide, but these data are in conflict with contemporary reports from Japan and Argentina. The purpose of the present study was to reexamine this question in a large independent cohort of patients. Eighty-six North American white patients and 102 control subjects were studied. HLA class I antigens were determined serologically, and the DRB1, DQA1, DQB1, and DPB1 genes and the DRB3/4/5 subtypes were determined by high-resolution genotyping. The greatest risk was associated with DRB1*0301 (corrected probability [Pc] = 0.00003; relative risk [RR] = 4.58), and a secondary association with DRB1*0401 was identified (Pc = 0.000132; RR = 5.97). Protection from disease was associated with the DRB5*0101-DRB1*1501 haplotype (Pc = 0.021; RR = 0.3). However, further analysis indicated that a lysine residue at position 71 of the DR beta polypeptide may be the most important determinant of disease susceptibility (P = 0.0000003; RR = 8.6, increasing to RR = 16.38 with four lysine residues). DRB1*0301 and DRB1*0401 are confirmed as the principal susceptibility alleles for type 1 autoimmune...Continue Reading

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