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[Clinical implications of HCV quasispecies heterogeneity in patients with hepatitis C]
1Institute of Infectious Diseases, Guangzhou 8th People's Hospital, Guangzhou 510060, China.
Insights
Hepatitis C virus (HCV) quasispecies heterogeneity increases with disease progression and viremia. This viral diversity is influenced by infection duration, genotype, and transmission route, impacting HCV persistence and disease advancement.
Area of Science:
- Virology
- Hepatology
- Molecular Biology
Context:
- Hepatitis C virus (HCV) infection is a major global health concern.
- Viral quasispecies, defined as a collection of different but related viral genomes within an infected host, are known to influence viral pathogenesis.
- Understanding HCV quasispecies heterogeneity is crucial for managing chronic hepatitis C.
Purpose:
- To investigate the heterogeneity of hepatitis C virus (HCV) quasispecies.
- To determine the clinical significance of HCV quasispecies heterogeneity in patients with hepatitis C.
- To assess the relationship between HCV quasispecies diversity and clinical outcomes.
Summary:
- Single-stranded conformational polymorphism (SSCP) analysis of the HCV E2 hypervariable region 1 (HVR1) was used to detect quasispecies in 76 patients.
- Increased quasispecies heterogeneity was observed in chronic hepatitis, liver cirrhosis, and hepatocellular carcinoma compared to acute hepatitis.
- Quasispecies diversity correlated significantly with serum HCV RNA levels, infection duration, HCV genotype, and transmission route (blood transfusion, IV drug use).
Impact:
- Single-stranded conformational polymorphism (SSCP) is a validated, efficient method for analyzing HCV quasispecies heterogeneity.
- HCV quasispecies heterogeneity plays a critical role in persistent HCV infection and disease progression.
- Viral factors like duration, genotype, and viremia are key determinants of HCV quasispecies evolution.
Objective:
To determine the heterogeneity of viral quasispecies and its clinical significance in patients with hepatitis C.
Methods:
Quasispecies in the sera from 76 patients infected with hepatitis C virus were detected using single stranded conformational polymorphism (SSCP) analysis of the HCV E2 hypervariable region 1 (HVR1).
Results:
HVR1 was amplified in 72 (94.7%) of the 76 patients. The average number of SSCP bands was 5.8, with a range from 2 to 11. The numbers of quasispecies in acute hepatitis, chronic hepatitis and liver cirrhosis and/or primary hepatocellular carcinoma were 3.1 +/- 1.2, 6.0 +/- 2.3 and 8.4 +/- 4.1, respectively. There was a statistically significant difference among them (P < 0.01). Patients with infection acquired by blood transfusion and i.v. drug use had greater number of quasispecies than those acquired by other transmission pathway (sporadic) (P < 0.05). Patients with genotype 1 a and 1 b infection had increased quasispecies compared with those infected with HCV type 2 and 3(P < 0.05). Increased quasispecies heterogeneity was significantly correlated with serum HCV RNA levels (P < 0.01).
Conclusions:
SSCP is a simple, rapid and reliable method for the analysis of HCV viral quasispecies heterogeneity. Quasispecies heterogeneity plays an important role in HCV persistent infection and in the progress of hepatitis C. The duration of HCV infection, HCV genotype and HCV viremia are important determinants for the evolution of HCV quasispecies heterogeneity.