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Two Marek's disease virus (MDV) genes, one homologous to the glycoprotein B gene of herpes simplex virus and encoding the B antigen complex and the other encoding a 38-kDa phosphorylated protein (pp38), were inserted into the fowlpox virus (FPV) genome under the control of poxvirus promoters. Randomly selected nonessential regions of FPV were used for insertion, and the vaccinia virus 7.5 kDa polypeptide gene promoter or a poxvirus synthetic promoter was used for expression of MDV genes. Gene expression in cells infected with these recombinants was highly influenced by the promoter (the synthetic promoter being more effective) but was only slightly influenced by the insertion site and by the transcription direction of the insert relative to the direction of the flanking FPV sequences. Cells infected with an FPV recombinant expressing the MDV gB gene reacted positively with a monoclonal antibody specific to this glycoprotein in an immunofluorescence assay. Immunoprecipitation of infected cell lysates showed three glycoproteins identical to those associated with the B antigen complex of MDV (100, 60, and 49 kDa). Cells infected with a recombinant expressing the pp38 gene reacted positively with an anti-pp38 monoclonal antibody in an immunofluorescence assay. The generated protein was phosphorylated and had a molecular weight similar to that of the native pp38 protein. Sera from chickens immunized with an FPV recombinant expressing the MDV glycoprotein B gene reacted with MDV-infected cells.
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