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Clinical backgrounds of the patients having different types of hepatitis C virus genomes
N Takada1, S Takase, N Enomoto
1Department of Internal Medicine, Kanazawa Medical University, Ishikawa, Japan.
Insights
Hepatitis C virus (HCV) typing revealed two main types, K1-PT and K2, with K1-PT being most common. Clinical features, like interferon response, differed between HCV types, suggesting distinct disease progressions.
Area of Science:
- Virology
- Hepatology
- Infectious Diseases
Background:
- Hepatitis C virus (HCV) genome variations are recognized.
- Understanding HCV subtypes is crucial for disease management and treatment strategies.
Purpose of the Study:
- To perform genotyping of Hepatitis C virus (HCV) in patients.
- To compare clinical features associated with different HCV genotypes.
- To investigate the prevalence of HCV genotypes in various liver diseases.
Main Methods:
- Nucleotide sequencing of cDNA fragments from 91 HCV-RNA-positive patients.
- Hybridization of amplified cDNAs with specific probes for HCV-K1-PT and HCV-K2.
- Comparison of clinical data, including antibody detection, disease forms, blood transfusion history, and interferon response, between genotype groups.
Main Results:
- HCV genomes were classified into two main types: HCV-K1-PT (approx. 80%) and HCV-K2 (approx. 20%).
- Antibody detection rates to C-100-3 protein did not differ significantly between HCV types.
- HCV-K2 was more prevalent in younger patients, with a lower history of blood transfusion and better initial interferon response compared to HCV-K1-PT.
- Prevalence varied in alcoholic liver disease, but was similar across non-alcoholic non-B hepatitis (NANB) forms.
Conclusions:
- Hepatitis C virus (HCV) in Japan appears to be limited to two major types, K1-PT and K2, with K1-PT being predominant.
- Clinical manifestations and treatment responses may differ between HCV-K1-PT and HCV-K2 infections.
- Further research with larger patient cohorts is necessary to confirm these genotype-specific clinical differences and their implications.
Abstract:
Hepatitis C virus (HCV) genomes were recently detected in biological materials, and variations of nucleotide sequences were reported. In the present study, typing of the HCV genomes was performed in 91 HCV-RNA-positive patients and the clinical features of patients with different types of HCV were compared. From the nucleotide sequences of the cDNA fragments, HCV can be divided into at least two types: HCV-K1-PT and HCV-K2. All cDNAs amplified from 91 patients were hybridized with cDNA probes of either HCV-K1-PT or HCV-K2. HCV-K1-PT was found in about 80% of the patients, and HCV-K2 was found in about 20% of the patients. These results indicate that types of HCV are limited to two types, i.e., K1-PT and K2, and the major type is HCV-K1-PT, at least in Japan. Detection rate of antibodies to C-100-3 protein were not different between the patients having HCV-K1-PT and HCV-K2, indicating that the antibodies may develop in HCV-related patients without relation to the types of the HCV genomes. Prevalence of the two types of HCV were nearly the same in various forms of NANB-related liver disease. However, the prevalence was somewhat different in alcoholic liver disease. HCV-K2 was found in patients younger than the patients with HCV-K1-PT. Frequency of a history of blood transfusion tended to be lower and the initial response to interferon treatment was clearly better in patients having HCV-K2 versus patients having HCV-K1-PT. These results suggest the possibility that clinical features due to HCV-K1 may be somewhat different from those due to HCV-K1-PT. However, the number of patients examined was too small to allow a definite conclusion, indicating a necessity for further study with a larger number of patients.