Related Experiment Videos
Dysregulated surface gene expression from disrupted hepatitis B virus genomes
1Department of Pathology 113B, Veterans Affairs Medical Center, San Francisco, California.
Journal of Virology
|December 1, 1993
Summary
Hepatitis B virus (HBV) genomic rearrangements during chronic infection disrupt viral DNA, affecting surface gene expression. These disruptions may contribute to ground-glass hepatocytes by blocking protein secretion.
Area of Science:
- Virology
- Hepatology
- Molecular Biology
Background:
- Chronic hepatitis B virus (HBV) infection involves viral genome integration into host DNA.
- Integration can lead to significant viral DNA disruption and rearrangement.
- Understanding these rearrangements is crucial for explaining HBV pathogenesis.
Purpose of the Study:
- To investigate the impact of HBV genomic disruptions on viral surface gene expression.
- To determine the role of enhancer deletion in surface gene dysregulation.
- To explore the link between genomic rearrangements and ground-glass hepatocyte formation.
Main Methods:
- Transfection of cells with disrupted HBV genomes.
- Analysis of viral surface gene transcript levels (major and large forms).
- Assessment of surface protein secretion pathways, focusing on the endoplasmic reticulum-Golgi intermediate compartment.
Main Results:
- Disrupted HBV genomes lacking enhancers showed dysregulated surface gene expression.
- A decrease in transcripts for the major surface protein was observed.
- Protein secretion was blocked, accumulating surface proteins in the endoplasmic reticulum-Golgi intermediate compartment.
Conclusions:
- HBV genomic rearrangements, particularly enhancer deletions, dysregulate surface gene expression.
- Overexpression of the large surface protein contributes to secretion blockage.
- These viral genomic alterations are implicated in the pathogenesis of ground-glass hepatocytes in chronic hepatitis B.