Temporal regulation of equine herpesvirus type 3 transcription

Donna C. Sullivan, Wayne L. Gray, Gretchen B Caughman, Alice T. Robertson, Dennis J. O'Callaghan

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1 Scopus citations


The transcription of equine herpesvirus type 3 (EHV-3; equine coital exanthema virus) has been examined and found to be temporally regulated into three classes: immediate early (IE), early (E), and late (L). Hybridization of in vivo 32 PO 4 -labeled transcripts revealed that IE transcript(s) are derived exclusively from the inverted repeat segments (IRs) of the viral genome, while E and L transcripts are not restricted to any specific region of the genome. Northern blot analysis of EHV-3 IE RNA revealed a single transcript of approximately 5.7 kb (3.8 MDa). We have previously shown that transcription of equine herpesvirus type 1 (EHV-1) DNA is temporally regulated and produces a single 6 kb IE RNA which is derived from the IRs segments. In this paper, we show that the EHV-1 and EHV-3 IE RNA species are homologous, reflecting the colinearity of the genomes of these two related viruses. While four IE polypeptides are synthesized in EHV-1 infected cells in the presence of actinomycin D following the removal of a cycloheximide block, only one major IE polypeptide (180 kDa) is detectable in EHV-3 infected cells under these conditions. However, immunoprecipitation of EHV-3 infected cell extracts with polyvalent rabbit antisera to IE1 of EHV-1 revealed at least two other viral specific IE polypeptides.

Original languageEnglish (US)
Pages (from-to)135-148
Number of pages14
JournalVirus Research
Issue number2
Publication statusPublished - Jan 1 1990



  • EHV-3 transcription
  • Equine herpesvirus type 3
  • Immediate early gene

ASJC Scopus subject areas

  • Virology
  • Infectious Diseases
  • Cancer Research

Cite this

Sullivan, D. C., Gray, W. L., Caughman, G. B., Robertson, A. T., & O'Callaghan, D. J. (1990). Temporal regulation of equine herpesvirus type 3 transcription. Virus Research, 15(2), 135-148. https://doi.org/10.1016/0168-1702(90)90004-U