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J Virol. 1984 June; 50(3): 832-837

Cloning and structural analysis of integrated woodchuck hepatitis virus sequences from a chronically infected liver.

C E Rogler and J Summers

ABSTRACT

We have isolated and determined the structure of a recombinant clone in lambda phage Charon 30 which contains woodchuck hepatitis virus sequences integrated in woodchuck genomic DNA sequences. This clone, in contrast to previously reported clones (Ogston et al., Cell 29:385-394, 1982), was isolated from a chronically infected liver which never developed hepatocellular carcinoma. Southern blot analysis of viral sequences in the clone in conjunction with electron microscope heteroduplex analysis showed that the integrated viral sequences did not contain internal rearrangements, as have those from hepatomas, but were colinear with the cloned viral genome except for the deletion of approximately 500 base pairs of viral sequences (between positions 1,000 and 1,550 on the viral map). Therefore, the integration was probably a defective genome incapable of supporting viral replication. However, the complete open reading frames coding for the viral X, core, presurface , and surface antigen genes were present, indicating that the viral sequences could code for viral antigens. Southern blot analysis of the normal cellular flanking sequences, using flanking sequence probes from the clone, showed that no detectable rearrangements of cellular DNA (less than 50 base pairs) had occurred at the site of viral integration.

J Virol. 1984 June; 50(3): 832-837






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