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Eleven loci encoding trans-acting factors are required for transient complementation of human cytomegalovirus oriLyt-dependent DNA replication.

Laboratory of Virology, Wadsworth Center for Laboratories and Research, Albany, New York.

ABSTRACT

Recently we described the use of human cytomegalovirus (HCMV) cosmid clones in a cotransfection assay of HCMV oriLyt replication (G. S. Pari, M. A. Kacica, and D. G. Anders, J. Virol. 67:2575-2582, 1993). We have now used this assay to identify 11 distinct required loci encoding trans-acting factors sufficient for transient complementation of oriLyt-dependent DNA replication. This set includes all of the virus genes essential to initiate and perform DNA synthesis together with the virus genes required to express these replication functions from their native promoters. Six of the identified loci span open reading frames (ORFs) that encode homologs or probable homologs of herpes simplex virus type 1 replication genes, consistent with predictions based on sequence similarities and biochemical properties. These include the DNA polymerase UL54 and polymerase-associated protein UL44, the single-stranded-DNA-binding protein UL57, and proposed subunits of a helicase-primase complex, UL70, UL105, and UL101-102. Frameshift mutations in any one of these essential ORFs abrogated complementation of DNA replication. Three required loci, UL36-38, IRS1 (or TRS1), and IE1/IE2, encode known regulatory proteins. The remaining two loci span ORFs UL84 and UL112-113 and encode early temporal class nucleus-associated proteins of unknown function. Neither of these genes have been implicated previously in DNA replication or in regulating gene expression, nor have counterparts in herpes simplex virus type 1 or Epstein-Barr virus been described. The results presented here will facilitate investigation of the mechanisms and regulation of HCMV lytic-phase DNA replication.

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