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The role of human leukocyte antigen (HLA) class II polymorphisms in the pathogenesis and progression of primary immunoglobulin A nephropathy (pIgAN) is unclear. This study aimed to explore the relationship of HLA-DRB1 alleles with the susceptibility and disease progression of pIgAN in Han Chinese. A PCR-based genotyping technique was used to detect HLA-DRB1 alleles in 139 patients with pIgAN and 143 healthy subjects. A total of 37 HLA-DRB1 alleles were detected, of which 30 were found in pIgAN patients and 29 in healthy subjects. In pIgAN patients, the frequencies of HLA-DRB1*140501 (belonging to DR*14) were significantly increased, while the frequencies of HLA-DRB1*070101 (belonging to DR*7) were significantly reduced compared with the healthy individuals. Further stratification analysis revealed that the frequencies of HLA-DRB1*030101 in pIgAN patients with normal renal function were significantly higher than those in patients with renal dysfunction. These findings suggest that HLA-DRB1 polymorphisms are related to the occurrence and disease progression of pIgAN patients in Han Chinese, with HLA-DRB1*140501 being a susceptible allele and HLA-DRB1*070101 a resistant allele. HLA-DRB1*030101 may serve as a predictor of disease progression and renal damage of pIgAN in Han Chinese. Further studies are warranted to explore the immunological mechanisms for the genotype-disease phenotype relationship.

Human Leukocyte Antigen <i>DRB1</i> Alleles Predict Risk and Disease Progression of Immunoglobulin A Nephropathy in Han Chinese