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Variability and conservation in hepatitis B virus core protein.
Benjamin M Chain1, Richard Myers
1Department of Immunology and Molecular Pathology, University College London, W1T 4JF UK. b.chain@ucl.ac.uk
BMC Microbiology
|June 1, 2005
Summary
Evolutionary forces driving Hepatitis B core protein (HBVc) variation are limited, with most amino acids conserved. Structural constraints, not immune selection, primarily shape HBVc diversity, making it a poor genotype predictor.
Area of Science:
- Virology
- Molecular Evolution
- Structural Biology
Background:
- Hepatitis B core protein (HBVc) is crucial for viral structure and immunity.
- Evolutionary drivers of HBVc sequence variation remain unclear.
Purpose of the Study:
- To investigate sequence variation in HBVc.
- To understand the evolutionary forces shaping HBVc diversity.
- To assess the relationship between HBVc diversity and HBV genotype.
Main Methods:
- Analysis of a large dataset of HBVc protein sequences from public repositories.
- Sequence alignment to identify polymorphisms.
- Phylogenetic analysis to examine diversity and evolutionary pressures.
Main Results:
- Polymorphisms are concentrated on the outer surface and spike of the HBVc capsid.
- Most HBVc amino acids (over 75%) are conserved.
- HBVc diversity does not reliably predict HBV genotype.
Conclusions:
- Capsid assembly structural requirements significantly limit HBVc diversity.
- Immunological selection appears to play a minor role in driving HBVc variation.
- Core protein evolution is constrained by specific forces within the broader HBV genome evolution.