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Updated: Feb 19, 2026
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
CTLA-4 Gene Haplotypes and the Risk of Chronic Hepatitis C Infection; a Case Control Study
Samaneh Sepahi1, Alireza Pasdar2,3, Sina Gerayli4
1Targeted Drug Delivery Research Center, School of Pharmacy, Mashhad University of Medical Sciences, Mashhad, Iran.
Background:
The prevalence of hepatitis C virus (HCV) infection is increasing worldwide. Cytotoxic Tlymphocyte-associated protein 4 (CTLA-4) may play a role in the intensity of the disease. The aim of this study was to evaluate the association between genetic variants of the CTLA-4 and HCV infection.
Methods:
Restriction fragment length polymorphism-polymerase chain reaction (RFLP-PCR) was performed as the genotyping assay at four different positions (+49 A>G, -318 C>T, -1722 T>C, and - 1661 A>G). Haplotypes were analyzed using PHASE software. Sixty-five HCV patients and 65 healthy individuals as controls who were referred to the hepatitis clinic in Mashhad, Iran, were recruited. Genomic DNA was extracted from whole blood of participants.
Results:
In a dominant analysis model of the -1661 position (GG vs. AA+AG), the AA genotype was more common in controls than in patients (adjusted P = 0.0003; OR = 0.15, 95% CI = 0.051 -0.42). The GCAT haplotype was also more prevalent in controls than in patients (adjusted P = 0.01; OR = 0.40, 95% CI = 0.20-0.81). Furthermore, the ACGT/ACGT diplotype was more common in controls than in patients (P = 0.0037; OR = 0.15, 95% CI = 0.04-0.54). In addition, the ACGT/ACAT diplotype was more frequent in patients than controls (adjusted P =0.003; OR = 2.48, 95% CI = 1.37- 4.50).
Conclusion:
Our results indicated that polymorphisms in CTLA-4 and certain haplotypes may affect the risk of HCV infection in our population, although a larger sample size may be required to confirm this association.
