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[Sequence diversity and variability in the putative envelope proteins including hypervariable regions of hepatitis C
Nihon Rinsho. Japanese Journal of Clinical Medicine
|February 1, 1993
Summary
Hepatitis C virus (HCV) genomes exhibit significant sequence diversity, particularly in envelope proteins. Mutations in HVR1 are implicated in persistent HCV infection, offering insights into viral persistence mechanisms.
Area of Science:
- Virology
- Molecular Biology
- Genetics
Context:
- Hepatitis C virus (HCV) exhibits considerable genetic variability within its genome.
- The envelope glycoproteins (gp35 and gp70) are known hotspots for sequence diversity.
- Understanding this diversity is crucial for comprehending viral pathogenesis and persistence.
Purpose:
- To identify and characterize hypervariable regions within the HCV envelope glycoproteins.
- To investigate the sequence diversity of these regions across different HCV genotypes (HCV-I and HCV-II).
- To explore the potential role of mutations in these regions, particularly HVR1, in chronic hepatitis C.
Summary:
- Two hypervariable regions, HVR1 and HVR2, were identified in the N-terminal gp70 of HCV-II.
- Extensive amino acid sequence diversity was observed in HVR1 for both HCV-I and HCV-II genotypes.
- HVR1 amino acid alterations were also noted in patients with chronic hepatitis C, suggesting its involvement in persistent infection.
Impact:
- Identifies specific hypervariable regions (HVR1, HVR2) in HCV envelope proteins.
- Highlights the significant sequence diversity of HVR1 across different HCV genotypes.
- Provides evidence suggesting HVR1 mutations contribute to the persistence of Hepatitis C virus infection.