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. 1980 Sep;35(3):865–875. doi: 10.1128/jvi.35.3.865-875.1980

Growth dynamics of a latent primate papovavirus.

M Steffen, P Krieg, M Pernfuss, E Sauer, V Eisinger, G Sauer
PMCID: PMC288880  PMID: 7420542

Abstract

The stumptailed macaque papovavirus strain HD was discovered in a persistently infected cell line of primate origin designated Vero 76 (K. Bosslet and G. Sauer, J. Virol. 25:596--607, 1978; W. Waldeck and G. Sauer, Nature [London] 269:171--173, 1977). In clonal derivatives of Vero 76 cells a minor and variable proportion of cells is engaged in the productive synthesis of the HD virus strain. A combination of immunofluorescence using simian virus 40 polyoma subgroup-specific antiserum and in situ hybridization with HD complementary RNA revealed that only those cells which harbor discernible amounts of HD DNA also contain the subgroup-specific antigen. Treatment with arabinofuranosylcytosine caused irreversible disappearance of the antigen, whereas actinomycin D, in contrast, reversibly inhibited both HD DNA replication and synthesis of the subgroup-specific antigen. The proportion of HD DNA and subgroup-specific antigen-synthesizing cells in Vero 76 clonal lines could be either decreased or increased by the mode of passaging of the cell cultures. When cell cultures were split every 3 to 7 days at a 1:4 ratio, the amount of HD DNA sequences as revealed by DNA-DNA reassociation and by the Southern blotting technique fell below the level of detection after only a few passages. Furthermore, expression of the viral subgroup-specific antigen was no longer discernible. However, viral DNA persists in such latently infected cells, because a change in the splitting protocol to a 2-week passaging rhythm led to reinitiation of both viral DNA replication and expression of the subgroup-specific antigen. The HD DNA is perpetuated in a restricted state in latently infected cells in an episomal, unintegrated form as shown by Southern blot analysis. This finding complies with the fact that HD DNA-free subclones could be derived from persistently infected clonal Vero 76 cells. Such subclones have lost the viral genomes, probably owing to segregation during cell division.

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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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