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J Virol. 1991 November; 65(11): 5860-5872

Replacement mutagenesis of the human cytomegalovirus genome: US10 and US11 gene products are nonessential.

Molecular Biology Section, American Cyanamid Co., Pearl River, New York 10965.

ABSTRACT

The US6 gene family, located within the unique short region (US) of the human cytomegalovirus (HCMV) genome, contains six open reading frames (US6 through US11) which may encode glycoproteins, such as gcII (D. Gretch, B. Kari, R. Gehrz, and M. Stinski, J. Virol. 62:1956-1962, 1988). By homologous recombination, several different recombinant HCMV were created which contain a marker gene, beta-glucuronidase, inserted within this gene family. It was demonstrated that beta-glucuronidase has utility as a marker gene for the identification of recombinants in this herpesvirus system, without the occurrence of deletions in other regions of the viral genome. DNA and RNA blot analyses attested to the fidelity of the recombination. Immunoprecipitation experiments using monospecific polyclonal antisera indicated that the US10 and/or US11 gene products were not expressed in the recombinants, as predicted. These results, along with single-cycle growth analyses, indicated that the US10 and US11 gene products are nonessential for virus replication and growth in tissue culture. HCMV recombinants expressing beta-glucuronidase seemed to be genetically stable.

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