Abstract
Human cytomegalovirus (HCMV) UL84 is required for oriLyt-dependent DNA replication, and evidence from transient transfection assays suggests that UL84 directly participates in DNA synthesis. In addition, because of its apparent interaction with IE2, UL84 is implicated as a possible regulatory protein. To address the role of UL84 in the context of the viral genome, we generated a recombinant HCMV bacterial artificial chromosome (BAC) construct that did not express the UL84 gene product. This construct, BAC-IN84/Ep, displayed a null phenotype in that it failed to produce infectious virus after transfection into human fibroblast cells, whereas a revertant virus readily produced viral plaques and, subsequently, infectious virus. Real-time quantitative PCR showed that BAC-IN84/Ep was defective for DNA synthesis in that no increase in the accumulation of viral DNA was observed in transfected cells. We were unable to complement BAC-IN84/Ep in trans; however, oriLyt-dependent DNA replication was observed by the cotransfection of UL84 and BAC-IN84/Ep. An analysis of viral mRNA by real-time PCR indicated that, even in the absence of DNA synthesis, all representative kinetic classes of genes were expressed in cells transfected with BAC-IN...Continue Reading
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