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Properties and classification of hepatitis A virus.
1Division of Molecular Virology, Baylor College of Medicine, Houston, Texas 77030.
Vaccine
|January 1, 1992
Summary
Hepatitis A virus (HAV) is a distinct picornavirus, notable for its heat resistance and unique protein structure. Its stability necessitates careful handling and disinfection protocols for hepatitis A patients.
Area of Science:
- Virology
- Molecular Biology
- Hepatitis Research
Background:
- Hepatitis A virus (HAV) is a picornavirus, initially classified as enterovirus 72.
- Sequence analysis revealed distinct characteristics, leading to proposals for a new genus, Heparna-virus.
- HAV shares picornavirus traits: icosahedral structure, RNA genome, and polyprotein processing.
Purpose of the Study:
- To characterize the Hepatitis A virus (HAV) and its properties.
- To understand HAV's distinct features compared to other picornaviruses.
- To highlight implications for disinfection and patient care.
Main Methods:
- Nucleotide and amino acid sequence determination.
- Analysis of viral particle composition and structure.
- Assessment of viral stability under various conditions (heat, pH).
- Identification of antibody-binding sites (VP1, VP3).
Main Results:
- HAV genome is 7.48 kb positive-sense single-stranded RNA.
- HAV possesses four major polypeptides, with a smaller VP4 compared to other picornaviruses.
- HAV exhibits significant heat resistance (60°C for 1h, up to 80°C with MgCl2) and stability to acid.
- Only one serotype exists, with no cross-reactivity to other hepatitis viruses.
Conclusions:
- HAV's distinct genetic and structural properties warrant its classification in a new genus.
- HAV's stability requires enhanced disinfection measures.
- Further research into HAV cultivation and serology is supported by its unique characteristics.