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. 1988 Mar;62(3):1046–1054. doi: 10.1128/jvi.62.3.1046-1054.1988

Delineation of the viral products of recombination in vaccinia virus-infected cells.

D D Spyropoulos 1, B E Roberts 1, D L Panicali 1, L K Cohen 1
PMCID: PMC253665  PMID: 3339712

Abstract

Plasmids containing the vaccinia virus thymidine kinase gene, its flanking DNA sequences, and the Escherichia coli beta-galactosidase gene were used in conjunction with a thymidine kinase-deficient virus to examine the viral products of recombination. Progeny derived from single-crossover events could be distinguished from those generated by gene conversion or double-crossover events when the beta-galactosidase gene was separated from the thymidine kinase gene by the flanking sequences. Using methotrexate to select for recombinant virus and a chromogenic indicator to detect beta-galactosidase, the generation of viral recombinants was measured over a 48-h period. Recombinant progeny were first observed at 12 h and increased to a maximum of 2.5% at 48 h. Single-crossover products, as determined by beta-galactosidase expression, reached a maximum of 57% of the recombinant population at 24 h and thereafter declined. DNA hybridization analysis was used to examine genomic structures of the progeny of the initial viral plaques, plaques purified three times, and those subject to a 10(4)-fold amplification. These analyses confirmed that single-crossover events within either the 5'- or 3'-homologous flanking sequences generated unstable recombinant structures. These structures were shown to contain a single copy of the intact thymidine kinase gene within the corresponding copy of the duplicated thymidine kinase flanking sequences, separated by the beta-galactosidase gene and plasmid DNA. Significantly, these duplicated structures could undergo further recombination to produce repeats of either the intact or the deleted thymidine kinase sequences. These intermediate structures ultimately degenerated to produce either the parental thymidine kinase-deleted or the wild-type genome. The wild-type genome was also shown to be generated directly by gene conversion or double-crossover events.

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Selected References

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