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. 1992 Nov 1;89(21):9977–9981. doi: 10.1073/pnas.89.21.9977

Construction of chimeric vaccinia viruses by molecular cloning and packaging.

F Scheiflinger 1, F Dorner 1, F G Falkner 1
PMCID: PMC50260  PMID: 1438247

Abstract

Foreign DNA was inserted into unique restriction endonuclease cleavage sites (Sma I or Not I) of the 200,000-base-pair vaccinia virus genome by direct molecular cloning. The modified vaccinia virus DNA was packaged in fowlpox virus-infected avian cells, and chimeric vaccinia virus was isolated from mammalian cells not supporting the growth of the fowlpox helper virus. In contrast to the classical "in vivo" recombination technique, chimeric viruses with inserts in both possible orientations and families of chimeras with multiple inserts were obtained. The different genomic configurations of chimeric viruses provide a broader basis for screening of optimal viruses. In addition to packaging in avian cells, a second packaging procedure for vaccinia DNA, based on the abortive infection of mammalian cells with the fowlpox helper virus, was developed. This procedure permits simultaneous packaging and host-range selection for the packaged virus. The cloning/packaging procedure allows the direct insertion of foreign DNA without the need for plasmids having flanking regions homologous to viral nonessential regions and is independent of inefficient in vivo recombination events. By direct cloning and packaging, about 5-10% of the total vaccinia virus yield consisted of chimeras. The procedure is, therefore, a useful tool in molecular virology.

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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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