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J Virol. 1988 August; 62(8): 2836–2844.
PMCID: PMC253719

Replicative intermediates of hepatitis B virus in HepG2 cells that produce infectious virions.

Abstract

Clonal cells derived from HepG2 cells transfected with a plasmid containing hepatitis B virus (HBV) DNA secrete hepatitis B surface antigen particles, nucleocapsids, and virions (M. A. Sells, M.-L. Chen, and G. Acs, Proc. Natl. Acad. Sci. USA 84:1005-1009, 1987) which elicit acute hepatitis in chimpanzees (G. Acs, M. A. Sells, R. H. Purcell, P. Price, R. Engle, M. Shapiro, and H. Popper, Proc. Natl. Acad. Sci. USA 84:4641-4644, 1987). We report here the initial characterization of the viral nucleic acids produced in this culture system. Kinetic analyses of nuclear, cytoplasmic, and extracellular HBV DNAs were performed by Southern blotting with radiolabeled HBV strand-specific probes. The results from these analyses indicate that at the stationary cellular growth phase, there is a dramatic increase in the rate at which HBV DNA accumulates. Incomplete double- and single-stranded forms of the HBV genome were detected in the nuclear and cytoplasmic fractions as well as in the extracellular medium. In addition, the nuclear DNA apparently includes multiple complete copies of the HBV genome chromosomally integrated and full-length covalently closed circular HBV DNA. Multiple HBV-specific polyadenylated RNAs with lengths of 3.5, 2.5, and 2.1 kilobases were identified by Northern (RNA) blot analysis. S1 nuclease mapping and primer extension identified a single 3' end and multiple unique initiation sites corresponding to nucleotides just 5' to the pre-S1 region, as well as upstream and within the pre-S2 and precore regions. The nucleic acid profile obtained from these analyses is essentially a facsimile of that obtained by studying liver tissue from HBV-infected individuals.

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Selected References

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