A hepatitis B virus (HBV) genome was cloned from human liver. Numerous mutations in all viral genes define this HBV DNA as a mutant, divergent from all known HBV DNA sequences. Functional analyses of this mutant demonstrated a defect blocking viral DNA synthesis. The genetic basis of this defect was identified as a single missense mutation in the 5′ region of the viral polymerase gene, resulting in the inability to package pregenomic RNA into core particles. The replication defect could be trans-complemented by a full-length wild-type, but not by a full-length mutant or 3′-truncated wild-type, polymerase gene construct. Our findings indicate a critical role of the 5′ polymerase gene region in the life cycle of the virus and suggest that introducing missense mutations in this region can be a strategy to terminate viral replication in vivo.
|Original language||English (US)|
|Number of pages||7|
|Journal||Journal of Virology|
|State||Published - 1991|
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