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. 1981 Apr;38(1):294–304. doi: 10.1128/jvi.38.1.294-304.1981

Titration of integrated simian virus 40 DNA sequences, using highly radioactive, single-stranded DNA probes.

M A Marchionni, D J Roufa
PMCID: PMC171152  PMID: 6264104

Abstract

Nick-translated simian virus 40 (SV40) [32P]DNA fragments (greater than 2 X 10(8) cpm/micrograms) were resolved into early- and late-strand nucleic acid sequences by hybridization with asymmetric SV40 complementary RNA. Both single-stranded DNA fractions contained less than 0.5% self-complementary sequences; both included [32P]-DNA sequences that derived from all regions of the SV40 genome. In contrast to asymmetric SV40 complementary RNA, both single-stranded [32P]DNAs annealed to viral [3H]DNA at a rate characteristic of SV40 DNA reassociation. Kinetics of reassociation between the single-stranded [32P]DNAs indicated that the two fractions contain greater than 90% of the total nucleotide sequences comprising the SV40 genome. These preparations were used as hybridization probes to detect small amounts of viral DNA integrated into the chromosomes of Chinese hamster cells transformed by SV40. Under the conditions used for hybridization titrations in solution (i.e., 10- to 50-fold excess of radioactive probe), as little as 1 pg of integrated SV40 DNA sequence was assayed quantitatively. Among the transformed cells analyzed, three clones contained approximately one viral genome equivalent of SV40 DNA per diploid cell DNA complement; three other clones contained between 1.2 and 1.6 viral genome equivalents of SV40 DNA; and one clone contained somewhat more than two viral genome equivalents of SV40 DNA. Preliminary restriction endonuclease maps of the integrated SV40 DNAs indicated that four clones contained viral DNA sequences located at a single, clone-specific chromosomal site. In three clones, the SV40 DNA sequences were located at two distinct chromosomal sites.

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Selected References

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