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Hepatitis B virus (HBV) genomic variations in chronic hepatitis
E Cariani1, G Fiordalisi, D Primi
1Consiglio Nazionale delle Ricerche (CNR), Institute of Chemistry, Medical School, Brescia, Italy.
Archives of Virology. Supplementum
|January 1, 1992
Summary
Chronic hepatitis B virus (HBV) infection involves diverse pre-C gene sequences with mutations. Some HBV variants may evade immune detection, contributing to persistent infections in carriers.
Area of Science:
- Virology
- Hepatology
- Immunology
Background:
- Chronic Hepatitis B Virus (HBV) infection affects millions globally.
- The pre-C/C region of HBV is crucial for viral replication and immune evasion.
- Understanding HBV genetic diversity is key to managing chronic infections.
Purpose of the Study:
- To analyze the sequence heterogeneity of the HBV pre-C/C region in chronically infected patients.
- To identify mutations within the pre-C/C region and their potential impact on viral proteins.
- To investigate the role of pre-C/C variants in viral persistence.
Main Methods:
- Polymerase Chain Reaction (PCR) was used to amplify the pre-C/C region of HBV DNA.
- Sera from anti-HBe positive, chronically HBV-infected patients were analyzed.
- Sequencing was performed to identify point mutations and genetic variations.
Main Results:
- The majority of HBV-infected sera exhibited heterogeneous pre-C sequences.
- Commonly observed were 1-3 non-randomly located point mutations.
- Identified HBV variants demonstrated impaired synthesis of immunogenic proteins.
Conclusions:
- Heterogeneous HBV pre-C/C sequences with specific mutations are prevalent in chronic carriers.
- Certain HBV variants may escape host immune responses due to defective protein synthesis.
- These immune-evasive variants likely contribute to the persistence of HBV infection.