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Updated: May 1, 2026
A Protocol for Analyzing Hepatitis C Virus Replication
Published on: June 26, 2014
Genotype dependence of hepatitis C virus antibodies detectable by the first-generation enzyme-linked immunosorbent
R Nagayama1, F Tsuda, H Okamoto
1First Department of Internal Medicine, Teikyo University School of Medicine, Tokyo, Japan.
Insights
Hepatitis C virus (HCV) genotype detection varied significantly with antibody assays. Genotype I and II showed higher antibody detection rates than genotypes III and IV due to sequence conservation.
Area of Science:
- Virology
- Immunology
- Hepatology
Background:
- Hepatitis C virus (HCV) is a major cause of chronic liver disease worldwide.
- Accurate genotyping of HCV is crucial for understanding disease progression and treatment efficacy.
- Serological assays are widely used for HCV detection, but their performance can vary across genotypes.
Purpose of the Study:
- To investigate the correlation between different Hepatitis C virus genotypes and the detection of specific HCV-associated antibodies.
- To evaluate the impact of HCV genotype heterogeneity on the sensitivity of first-generation ELISA (ELISA-1) assays.
Main Methods:
- HCV genotyping of 155 sera using polymerase chain reaction (PCR) amplification of core-gene sequences.
- Comparison of HCV genotypes with antibody detection using first-generation ELISA (ELISA-1) and a second-generation immunoblot assay.
- Analysis of amino acid sequence conservation of the C100-3 protein across different HCV genotypes.
Main Results:
- HCV genotypes I and II showed significantly higher antibody detection rates with ELISA-1 compared to genotypes III and IV.
- Antibody detection rates for C100-3 protein were 93% for genotype I and 79% for genotype II, versus 34% for genotypes III and IV.
- Amino acid sequence conservation of C100-3 was approximately 90% between genotypes I and II, but only 75% between genotype I and genotypes III/IV.
Conclusions:
- The sensitivity of ELISA-1 for detecting HCV infection is significantly influenced by the heterogeneity of C100-3 sequences among different HCV genotypes.
- Genotyping of HCV is essential for interpreting serological assay results accurately.
- Further development of serological assays is needed to improve detection across all HCV genotypes.
Abstract:
Hepatitis C virus (HCV) samples in 155 sera, from patients with chronic non-A, non-B liver disease and blood donors, were grouped into four genotypes (I, II, III, and IV) by amplification of core-gene sequences by polymerase chain reaction with type-specific primers. HCV genotypes were compared with various HCV-associated antibodies detectable by the first-generation ELISA (ELISA-1) with C100-3 protein and a second-generation immunoblot assay with four recombinant HCV proteins. Antibodies to C100-3 protein and those to its subsequence (5-1-1) were detected in 13 (93%) and 12 (86%), respectively, of 14 sera with genotype I HCV; 56 (79%) and 58 (82%) of 71 sera with genotype II; 13 (34%) and 6 (16%) of 38 sera with genotype III; and 11 (34%) and 4 (13%) of 32 sera with genotype IV. Amino acid sequences of C100-3 of genotype I HCV are conserved by approximately 90% in genotype II, but only by approximately 75% in genotypes III and IV. The sensitivity of ELISA-1, therefore, would be influenced by heterogeneity in C100-3 sequences of different genotypes.
