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Journal of Virology, February 2004, p. 1763-1774, Vol. 78, No. 4
0022-538X/04/$08.00+0     DOI: 10.1128/JVI.78.4.1763-1774.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.

Phenotype of a Herpes Simplex Virus Type 1 Mutant That Fails To Express Immediate-Early Regulatory Protein ICP0

Roger D. Everett,* Chris Boutell, and Anne Orr

MRC Virology Unit, Institute of Virology, Glasgow G11 5JR, Scotland, United Kingdom

Received 25 July 2003/ Accepted 1 November 2003

Herpes simplex virus type 1 (HSV-1) immediate-early (IE) regulatory protein ICP0 is required for efficient progression of infected cells into productive lytic infection, especially in low-multiplicity infections of limited-passage human fibroblasts. We have used single-cell-based assays that allow detailed analysis of the ICP0-null phenotype in low-multiplicity infections of restrictive cell types. The major conclusions are as follows: (i) there is a threshold input multiplicity above which the mutant virus replicates normally; (ii) individual cells infected below the threshold multiplicity have a high probability of establishing a nonproductive infection; (iii) such nonproductively infected cells have a high probability of expressing IE products at 6 h postinfection; (iv) even at 24 h postinfection, IE protein-positive nonproductively infected human fibroblast cells exceed the number of cells that lead to plaque formation by up to 2 orders of magnitude; (v) expression of individual IE proteins in a proportion of the nonproductively infected cells is incompletely coordinated; (vi) the nonproductive cells can also express early gene products at low frequencies and in a stochastic manner; and (vii) significant numbers of human fibroblast cells infected at low multiplicity by an ICP0-deficient virus are lost through cell death. We propose that in the absence of ICP0 expression, HSV-1 infected human fibroblasts can undergo a great variety of fates, including quiescence, stalled infection at a variety of different stages, cell death, and, for a minor population, initiation of formation of a plaque.

* Corresponding author. Mailing address: MRC Virology Unit, Institute of Virology, Church St., Glasgow G11 5JR, Scotland, United Kingdom. Phone: 44 0141 330 3923. Fax: 44 0141 337 2236. E-mail: r.everett{at}vir.gla.ac.uk.

Journal of Virology, February 2004, p. 1763-1774, Vol. 78, No. 4
0022-538X/04/$08.00+0     DOI: 10.1128/JVI.78.4.1763-1774.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.



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