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• W2020396775 abstract "A p7.5/beta-galactosidase (7.5 lacZ) gene construct, cloned adjacent to the fowlpox virus (FPV) thymidine kinase (tk) gene was used as a marker to identify the products of recombination as 'blue' FPV plaques. The rFPVs were detected as early as 4 h after the introduction of plasmid DNAs and by 72 h post-infection (p.i.) for one transfer vector comprised 0.48% of the viral population. The proportion of rFPV increased linearly from 0.073% to 0.62% as the cumulative length of homologous sequences in the transfer vector increased from 0.73 to 4.5 kb. Two approaches using a second reporter gene, the Newcastle disease virus haemagglutinin-neuraminidase (NDV HN) gene were tested to differentiate between single and double cross-over events. In one, the HN gene was cloned into the FPV tk gene and the 7.5 lacZ cloned outside of the homologous region. Progeny of a single cross-over with FPV DNA generated an unstable plaque containing the HN gene and subsequent intramolecular recombination resulted in excision of the 7.5 lacZ and the generation of a stable 'white' plaque. For virus grown in CEF cells (tk+) in the presence of 5-bromo-deoxyuridine, only those viruses which contained a tk gene disrupted by the HN gene formed plaques. This approach allowed us to easily identify rFPV containing the HN gene but lacking 7.5 lacZ or other bacterial sequences. In a second approach, a double cross-over between rFPV DNA containing a stably expressed beta-galactosidase gene cloned into the tk gene (blue plaque) and plasmid DNA containing the HN gene flanked by tk sequences would allow transplacement of the 7.5 lacZ gene with the HN gene, and generating a white plaque. We were unable to generate recombinant viruses with the HN gene and which generated a white plaque, indicating that double cross-over events do not occur at a sufficiently high frequency in FPV." @default.
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• W2020396775 date "1994-06-01" @default.
• W2020396775 modified "2023-10-14" @default.
• W2020396775 title "Studies of fowlpox virus recombination in the generation of recombinant vaccines" @default.
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• W2020396775 doi "https://doi.org/10.1016/0168-1702(94)90078-7" @default.
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