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Cited by 332

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Human Cytomegalovirus with IE-2 (UL122) Deleted Fails To Express Early Lytic Genes

Open access
Marchini, Andrew, Liu, Haiqing, Zhu, Hua·2001·Journal of Virology

Abstract

Much evidence suggests that the major immediate-early (IE) transactivator of human cytomegalovirus (HCMV), IE-2, is likely to be critical for efficient viral replication; however, the lack of an IE-2 mutant HCMV has precluded an experimental test of this hypothesis. As an initial step toward characterizing an IE-2 mutant, we first cloned the HCMV Towne genome as a bacterial artificial chromosome (BAC) and analyzed the ability of transfected Towne-BAC DNA (T-BACwt) to produce plaques following introduction into permissive human fibroblasts. Like Towne viral DNA, transfected T-BACwt DNA was infectious in permissive cells, and the resulting virus stocks were indistinguishable from Towne virus. We then used homologous recombination in Escherichia coli to delete the majority of UL122, the open reading frame encoding the unique portion of IE-2, from T-BACwt. From this deleted BAC, a third BAC clone in which the deletion was repaired with wild-type UL122 was created. In numerous transfections of permissive human foreskin fibroblast cells with these three BAC DNA clones, the rescued BAC and T-BACwt consistently yielded plaques, while the UL122 mutant BAC never generated plaques, even after 4 weeks. Protein and mRNA of other IE genes were readily detected from transfected UL122 mutant BAC DNA; however, reverse transcription-PCR failed to detect mRNA expression from any of five early genes examined. The generalized failure of this mutant to express early genes is consistent with expectations from in vitro assays which have demonstrated that IE-2 transactivates most HCMV promoters. These experiments provide the first direct demonstration that IE-2 is required for successful HCMV infection and indicate that virus lacking IE-2 arrests early in the replication cycle.

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Crossref · 10.1128/jvi.75.4.1870-1878.2001

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Metadata

Authors
Marchini, A., Liu, H., & Zhu, H.
Venue
Journal of Virology
Published
2001-02-15
Volume
75
Issue
4
Pages
1870-1878
ISSN
  • 0022-538X (ISSN-L)
  • 1098-5514
OpenAlex
W2117505476
Cited by
332
References
26
FWCI
13.79
Type
journal article
Language
en
Open access
green

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CoChat. (2026). Citation check: Human Cytomegalovirus with IE-2 (UL122) Deleted Fails To Express Early Lytic Genes. https://app.cochat.ai/papers/10.1128/jvi.75.4.1870-1878.2001
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Marchini, A., Liu, H., & Zhu, H. (2001). Human Cytomegalovirus with IE-2 (UL122) Deleted Fails To Express Early Lytic Genes. Journal of Virology. https://doi.org/10.1128/jvi.75.4.1870-1878.2001

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