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Analysis of HBV-Specific CD4 T-cell Responses and Identification of HLA-DR-Restricted CD4 T-Cell Epitopes Based on a Peptide Matrix
Published on: October 20, 2021
Exploratory analysis of HLA SNPs associated with occult HBV infection: a multicenter case-control study in Chinese
Lin Zhou1,2, Ying Yan1,3, Huimin Ji1,3
1National Center for Clinical Laboratories, Institute of Geriatric Medicine, Chinese Academy of Medical Sciences, Beijing Hospital/National Center of Gerontology, Beijing, 100730, P.R. China.
Abstract:
Occult hepatitis B virus infection (OBI), characterized by detectable HBV DNA but undetectable HBsAg, poses diagnostic and clinical challenges, with host genetic factors, particularly HLA-mediated immune regulation, remaining poorly understood. Through whole-exome sequencing of 147 participants (74 OBI cases, 73 chronic HBsAg + controls), we identified four HLA single nucleotide polymorphisms (SNPs) associated with low OBI susceptibility and proposed a dual immune mechanism: Class I SNPs impair cytotoxic responses, while Class II SNPs dysregulate humoral immunity. Anti-HBs titers and age modulated genetic risk penetrance, with high anti-HBs increasing OBI susceptibility regardless of genotype, and genetic effects attenuating in individuals > 50 years. Integrating HLA genetic markers with serological and baseline characteristics significantly improved OBI susceptibility prediction (AUC 0.93), highlighting the role of HLA-mediated immunity in OBI pathogenesis and the potential of genetic markers for risk stratification in HBV-exposed individuals. Our findings elucidate HLA-mediated immune mechanisms underlying OBI and demonstrate the value of genetic markers in predicting the likelihood of developing OBI or progressing to chronic HBsAg + status among HBV-exposed individuals.
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