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. 1979 Nov;32(2):523–529. doi: 10.1128/jvi.32.2.523-529.1979

Construction and analysis of viable deletion mutants of polyoma virus.

G Magnusson, P Berg
PMCID: PMC353584  PMID: 228075

Abstract

Viable mutants of polyoma with small deletions ranging in size from 2 to 75 base pairs were obtained by infecting 3T3 cells with polyoma DNA that had been cleaved once with HaeII endonuclease or with DNase-Mn2+ digestion. The HaeII endonuclease-cleaved DNA yielded mutants with deletions at map position 72--73, whereas the mutants generated by DNase I-Mn2+ digestion had deletions either at map position 72--73 or within the map coordinates 92 and 99. Both groups of mutants appeared to grow as well as wild-type virus in 3T3 cells. The deletions at map position 72--73 did not alter the virus's ability to transform rat cells. Hence, the region just to the early side of the origin of DNA replication is not essential for vegetative growth or transformation. But the mutants with deletions in the region between map coordinates 92 and 99, a segment thought to code for polyoma large and middle T antigens (Hutchinson et al., Cell 15:65--77, 1978; Smart and Ito, Cell 15:1427--1437, 1978; Soeda et al., Cell 17:357--370, 1979), transformed rat cells at 0.2 to 0.05 the efficiency of wild-type virus.

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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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