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. 1977 Feb;21(2):565–578. doi: 10.1128/jvi.21.2.565-578.1977

Infectious linear DNA sequences replicating in simian virus 40-infected cells.

P Gruss, G Sauer
PMCID: PMC353859  PMID: 189087

Abstract

A new class of linear duplex DNA structures that contain simian virus 40 (SV40) DNA sequences and that are replicated during productive infection of cells with SV40 is described. These structures comprise up to 35% of the radioactively labeled DNA molecules that can be isolated by selective extraction. These molecules represent a unique size class corresponding to the length of an open SV40 DNA molecule (FO III), and they contain a heterogeneous population of DNA sequences either of host or of viral origin, as shown by restriction endonuclease analysis and nucleic acid hybridization. Part of the FO III DNA molecules contain viral-host DNA sequences covalently linked with each other. They start to replicate with the onset of SV40 superhelix replication 1 day after infection. Their rate of synthesis is most pronounced 3 days after infection when superhelix replication is already declining. Furthermore, they cannot be chased into other structures. At least a fraction of these molecules is infectious when administered together with DEAE-dextran to permissive cells. After intracellular circularization, superhelical DNA FO I with an aberrant cleavage pattern accumulates. In addition, tumor and viral capsid antigen are induced, and infectious viral progeny is obtained. Infection of cells with purified SV40 FO I DNA does not result in FO III DNA molecules in the infected cells or in the viral progeny. It is suggested, therefore, that these FO III DNA molecules are perpetuated within SV40 virus pools by encapsidation into pseudovirions.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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