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Identification of hepatitis C virus by immunoelectron microscopy
1Center for Liver Diseases, University of Miami School of Medicine, Veterans Administration Medical Center, FL 33125 USA.
Journal of Viral Hepatitis
|January 1, 1995
Summary
Researchers visualized hepatitis C virus (HCV) particles, revealing spherical, 70nm virions with icosahedral nucleocapsids. These morphological features align with flaviviruses and pestiviruses, enhancing our understanding of HCV structure.
Area of Science:
- Virology
- Microbiology
- Immunology
Background:
- Hepatitis C virus (HCV) sequencing advanced understanding of its natural history, immunology, and epidemiology.
- Definitive characterization of HCV morphology remained elusive despite sequencing advancements.
Purpose of the Study:
- To definitively characterize the morphology of the hepatitis C virion.
- To correlate observed viral morphology with known virus families.
Main Methods:
- Isolation of virus-like particles from human serum and liver tissue via concentration processes.
- Visualization using transmission electron microscopy (TEM).
- Identification using immunoelectron microscopy with monoclonal antibodies (mAb) against HCV.
Main Results:
- Spherical, flavi-like virus particles approximately 70 nm in diameter were observed.
- Particles exhibited a sucrose density of 1.04-1.12 g ml-1.
- Nucleocapsids (50 nm) showed icosahedral structure, enclosed by an envelope with surface projections.
- A 'tadpole' morphology was also noted.
- Particles bound to immunogold conjugates with anti-HCV mAbs.
Conclusions:
- The observed low buoyant density and morphological characteristics of HCV virions are consistent with those of flaviviruses and pestiviruses.
- This study provides the first detailed morphological description of the hepatitis C virion.
- Findings contribute to a comprehensive understanding of HCV structure and classification.