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. 1983 Oct;48(1):218–228. doi: 10.1128/jvi.48.1.218-228.1983

Quantitation of a simian virus 40 nonhomologous recombination pathway.

D L Dorsett, I Keshet, E Winocour
PMCID: PMC255338  PMID: 6310145

Abstract

We describe an infectious-center in situ plaque hybridization procedure which quantitates simian virus 40 (SV40) nonhomologous recombination in terms of the number of recombinant-producing cells in the DNA transfected cell population. Using this assay to measure the efficiency of recombination with SV40 DNA in permissive monkey BSC-1 cells, we found that: (i) over a range of DNA concentrations, polyomavirus DNA (which is partially homologous to SV40 DNA) cannot be distinguished from nonhomologous phi X174 RF1 DNA with respect to its ability to recombine with SV40 DNA; (ii) at defined DNA concentrations, polyomavirus and phi X174 RF1 DNA compete with each other for recombination with SV40 DNA; (iii) virtually all segments of the phi X174 genome recombine, apparently at random, with SV40 DNA; (iv) the frequency of recombinant-producing cells, among the successfully transfected (virion-producing) cells, depends upon the input SV40 DNA concentration in the transfection solution; and (v) replication-defective SV40 mutant DNAs compete with wild-type SV40 DNA for recombination with phi X174 RF1 DNA. From these observations, we conclude that the efficiency of recombination with SV40, in the system under study, is unaffected by nucleotide sequence homology and that a limiting stage in the recombination pathway occurs before SV40 DNA replication. Comparison of the dependency of recombination on initial SV40 DNA concentration with the dependency on initial phi X174 RF1 DNA concentration indicates that SV40 DNA sequences are a controlling factor in the nonhomologous recombination pathway.

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Selected References

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