CD81 and CLDN1 polymorphisms and hepatitis C virus infection susceptibility: a case control study

Area of Science:

• Genetics
• Virology
• Immunology

Background:

• Hepatitis C virus (HCV) entry relies on the CD81-CLDN1 co-receptor complex.
• Genetic variations in CD81 and CLDN1 genes are known to affect immune responses.
• Polymorphisms in these genes may influence an individual's susceptibility to HCV infection.

Purpose of the Study:

• To investigate the association between CD81 rs708564 and CLDN1 rs893051 polymorphisms and HCV susceptibility in a Chinese population.
• To explore potential gene-gene interactions between CD81 and CLDN1 in relation to HCV risk.
• To examine the influence of serum lipoprotein levels on the relationship between these genetic polymorphisms and HCV susceptibility.

Main Methods:

• A case-control study involving 461 HCV patients and 461 healthy controls.
• Genotyping of CD81 rs708564 and CLDN1 rs893051 single nucleotide polymorphisms (SNPs).
• Statistical analysis including odds ratios (OR) and 95% confidence intervals (CI) to assess genetic associations and interactions, considering lipid profiles.

Main Results:

• The CD81 rs708564 TT genotype was associated with a decreased risk of HCV infection (OR = 0.66).
• A significant gene-gene interaction between CD81 rs708564 TT and CLDN1 rs893051 GG genotypes showed a reduced HCV risk (OR = 0.59).
• The protective effect of CD81 rs708564 TT was more pronounced with lower high-density lipoprotein cholesterol (HDL-C) and higher low-density lipoprotein cholesterol (LDL-C) levels. Higher HDL-C levels were associated with decreased HCV susceptibility in individuals with the CLDN1 rs893051 G/C genotype.

Conclusions:

• The homozygous CD81 rs708564 TT genotype may act as a genetic modifier, reducing HCV susceptibility.
• Combined genotypes of CD81 rs708564 TT and CLDN1 rs893051 GG further decrease HCV risk.
• The observed genetic effects on HCV susceptibility are associated with serum lipoprotein levels, suggesting a complex interplay between genetics, lipids, and viral infection.