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A Protocol for Analyzing Hepatitis C Virus Replication
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Discrepancy between Hepatitis C Virus Genotypes and NS4-Based Serotypes: Association with Their Subgenomic Sequences
Nan Nwe Win1, Shingo Nakamoto2, Tatsuo Kanda3
1Department of Molecular Virology, Graduate School of Medicine, Chiba University, Chiba 260-8677, Japan. nannwewin@gmail.com.
International Journal of Molecular Sciences
|January 21, 2017
Summary
Accurate hepatitis C virus (HCV) genotyping is crucial for treatment. Sequencing methods, especially deep sequencing, can resolve discrepancies between genotyping and serotyping, ensuring correct patient management.
Area of Science:
- Virology
- Molecular Diagnostics
- Infectious Diseases
Background:
- Hepatitis C virus (HCV) genotype determination is vital for effective direct-acting antiviral therapy.
- Occasional discrepancies arise between HCV serotyping and genotyping assays, potentially impacting treatment decisions.
Purpose of the Study:
- To investigate discrepancies between HCV genotyping and serotyping methods.
- To evaluate the utility of sequencing, including deep sequencing, in resolving these diagnostic discrepancies.
Main Methods:
- Analysis of 18 discrepant samples using Sanger sequencing of HCV core and NS4 regions.
- Comparison of sequencing results with conventional genotyping (5'-UTR) and serotyping (NS4) data.
- Deep sequencing of HCV NS4 regions in discrepant samples.
Main Results:
- Sequencing of 17 of 18 discrepant samples showed concordance with 5'-UTR genotyping.
- Cloning analysis revealed minor subgenotypic variations in two samples, identified by deep sequencing.
- Genome amplification-based genotyping demonstrated high consistency, while serotyping showed false reactions.
Conclusions:
- Sanger and deep sequencing accurately determine HCV genotypes and can resolve serotyping/genotyping discrepancies.
- Deep sequencing identified minor viral variants, highlighting its potential in complex cases.
- Accurate HCV genotyping is essential prior to initiating antiviral treatment.
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