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. 1972 Sep;10(3):399–409. doi: 10.1128/jvi.10.3.399-409.1972

Demonstration of Infectious Deoxyribonucleic Acid in Transformed Cells I. Recovery of Simian Virus 40 from Yielder and Nonyielder Transformed Cells

Virginia A L Boyd 1, Janet S Butel 1
PMCID: PMC356479  PMID: 4342048

Abstract

Deoxyribonucleic acid (DNA) was extracted from virus-free simian virus 40 (SV40)-transformed hamster, mouse, and monkey cells and was inoculated into simian cells in the presence of diethylaminoethyl (DEAE)-dextran; infectious SV40 was recovered by using DNA from cell lines which fail to yield virus by the fusion technique as well as from cell lines which readily yield virus by fusion. The rescued virus was identified as SV40 by three methods: (i) neutralization of plaque formation by specific antiserum; (ii) induction of synthesis of viral-specific antigens detected by immunofluorescence; and (iii) presence of papovavirus particles seen by the electron microscope. Treatment of the transformed cell DNA with deoxyribonuclease or omission of the DEAE-dextran prevented the rescue of virus. Large amounts of transformed cell DNA were required (>10 μg/culture of 106 cells) to effect rescue of SV40 by passage through monkey cells. A linear response was obtained between the input of DNA with inocula between 10 and 45 μg of DNA/culture and the yield of SV40 recovered. Biological activity was demonstrable irregularly when the transformed cell DNA was assayed directly in the presence of DEAE-dextran. The DNA induced plaque formation in about 50% of the trials as well as the synthesis of SV40 tumor and viral antigens in rare simian cells. The infectious DNA appeared to be associated with cellular DNA. The infectivity was found in the pellet of precipitated DNA obtained by the Hirt technique and was inactivated by boiling for 15 min. These properties are characteristic of linear cellular DNA and not of free, circular SV40 DNA.

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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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