Genetic polymorphisms of chemokine (C-X-C motif) ligand 10 gene associated with hepatitis B virus infection in a Chinese Han population.

BACKGROUND AND AIMS

Chemokine (C-X-C motif) ligand 10 (CXCL10) has been recently shown to be associated with inflammatory diseases. However, the association between the genetic variation of this gene and the susceptibility to hepatitis B virus (HBV) infection remains unclear, especially in children. This study aimed to investigate the relationship between CXCL10 polymorphisms and the risk of chronic HBV infection in a Chinese Han population.

METHODS

A two-stage case-control study of 1048 adults and 627 children was performed. A total of 5 tagging SNPs in CXCL10 were genotyped. Dual-Luciferase Reporter Assay was used to assess the effect of the rs4508917 polymorphism on transcriptional activity of CXCL10.

RESULTS

CXCL10 rs4508917 and rs4256246 polymorphisms were significantly associated with an increased risk of chronic HBV infection in Chinese Han adults (p = 0.036 and p = 0.033), of which rs4508917 AA genotype could increase the serum CXCL10 level (p = 0.014). In addition, the rs4508917 AA genotype was identified to facilitate HBV persistent infection (p = 0.017) and breakthrough infection (p = 0.013) in children. Subsequent functional analysis indicated that rs4508917 A allele could promote the transcriptional activity of CXCL10. Additionally, we observed that the rs4508917 A allele carriers (AA and AG genotypes) had a limited HBV viral load suppression in patients treated with nucleos(t)ide analogues (NAs).

CONCLUSION

The A allele of the CXCL10 rs4508917 may be a risk factor of the persistent HBV infection both in adults and children, which may influence the response to NAs treatment.