# Chronic Hepatitis B Virus Infection and HLA Variations in a Greek Population

## TL;DR

This study explores how specific HLA gene variations are linked to chronic hepatitis B virus infection in a Greek population.

## Contribution

The study identifies HLA alleles associated with susceptibility or protection against chronic HBV in a Greek cohort.

## Key findings

- HLA-C*01 and HLA-DRB1*16 alleles are more frequent in chronic HBV patients than in those with spontaneous clearance.
- HLA-A*01, HLA-B*08, and others show increased frequency in cHBV patients compared to healthy individuals.
- HLA-B*38 allele frequency is significantly lower in chronic HBV patients.

## Abstract

Chronic hepatitis B is linked with considerable liver-related morbidity and mortality globally. Human leukocyte antigen (HLA) polymorphisms affect the susceptibility and outcome of many immune-mediated diseases and infections. Our aim was to study the impact of HLA alleles on HVB-infected individuals in a Greek population. In total, 107 patients with chronic HBV infection (cHBV group) and 101 with spontaneous clearance (SC-group) of hepatitis B surface antigen (HBsAg) were genotyped for HLA-A, HLA-B, HLA-C, HLA-DRB1, and HLA-DQB1 loci by single-specific primer polymerase chain reaction (PCR-SSP). The HLA alleles’ frequencies were compared between the two patient groups and healthy individuals from the North Greece Bone Marrow Donor Registry (14506 samples). We found a significantly increased frequency of HLA-C*01 and HLA-DRB1*16 alleles in the cHBV group versus the SC-group. The frequency of HLA-A*01, HLA-B*08, HLA-C*01, HLA-C*08, HLA-DRB1*03, and HLA-DQB1*05 alleles was significantly higher in cHBV patients versus healthy individuals, while the frequency of the HLA-B*38 allele was significantly lower. Our study showed an association of specific HLA alleles with either susceptibility or protection against chronic HBV infection.