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Association of interferon gamma gene polymorphism and susceptibility to hepatitis C virus infection in Egyptian patients: A multicenter, family-based study.
Background and Aim: Polymorphisms in some genes may influence the persistence of hepatitis C virus (HCV) infection, clinical outcome, HCV replication, and liver damage. This study was conducted to investigate the role of the interferon gamma (IFN-γ) gene at (+874 T/A, -764 G/C, -179 C/A) single-nucleotide polymorphisms (SNPs) and its receptor (IFN-γR2) at (rs 2786067 A/C) SNP in the susceptibility of Egyptian families to HCV infection with high-resolution techniques.
Methods: In total, 517 Egyptian families, with 2246 subjects, were recruited to this study from the Upper and Lower Egypt governorates and were classified into three groups: 1034 patients with chronic hepatitis C virus, 108 subjects with spontaneous virus clearance (SVC), and 1104 subjects as a healthy control group. All subjects were genotyped for (+874 T/A, rs2430561, -764 G/C, rs2069707, -179 C/A, rs2069709, and rs 27860067, A/C) SNPs of the IFN-γ gene using the allelic discrimination real-time polymerase chain reaction technique and were confirmed using sequence-based typing.
Results: The carriage of T allele of (+874) IFN-γ is a risky allele and was significantly higher in chronic hepatitis C more than other two groups (odds ratio [OR]: 2.6646, P < 0.0002). On the other hand, the C allele of (-764, rs2069707) is a protective allele and was higher in SVC than the other two groups (OR: 0.2709, P < 0.0001). However, both (-179 C/A, rs 2069709) and (rs 27860067, A/C) SNPs are not polymorphic enough to be studied in the Egyptian population.
Conclusions: HCV infection is associated with the T allele of (+874 rs2430561), while SVC of HCV is associated with the C allele of (-764, rs2069707) of the IFN-γ gene.
Methods: In total, 517 Egyptian families, with 2246 subjects, were recruited to this study from the Upper and Lower Egypt governorates and were classified into three groups: 1034 patients with chronic hepatitis C virus, 108 subjects with spontaneous virus clearance (SVC), and 1104 subjects as a healthy control group. All subjects were genotyped for (+874 T/A, rs2430561, -764 G/C, rs2069707, -179 C/A, rs2069709, and rs 27860067, A/C) SNPs of the IFN-γ gene using the allelic discrimination real-time polymerase chain reaction technique and were confirmed using sequence-based typing.
Results: The carriage of T allele of (+874) IFN-γ is a risky allele and was significantly higher in chronic hepatitis C more than other two groups (odds ratio [OR]: 2.6646, P < 0.0002). On the other hand, the C allele of (-764, rs2069707) is a protective allele and was higher in SVC than the other two groups (OR: 0.2709, P < 0.0001). However, both (-179 C/A, rs 2069709) and (rs 27860067, A/C) SNPs are not polymorphic enough to be studied in the Egyptian population.
Conclusions: HCV infection is associated with the T allele of (+874 rs2430561), while SVC of HCV is associated with the C allele of (-764, rs2069707) of the IFN-γ gene.
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