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Ultrastructural Characterization of Herpes Simplex Virus Type 1 (Strain 17) Temperature-sensitive Mutants

Medical Research Council Virology Unit, Institute of Virology, University of Glasgow, Church Street, Glasgow G11 5JR, U.K.

We report the ultrastructural features associated with wild-type and temperature-sensitive (ts) mutant infection at non-permissive temperature for each of 18 herpes simplex virus type 1 (HSV-1) (strain 17) ts mutants. The mutants were classified by their ability to induce nucleocapsid-related structures:class I failed to induce any, class II induced empty and partially filled structures while class III induced all of the identified structures including those containing an electron-dense core. The time when expression of the ts lesion blocked virus replication was estimated for most mutants; this allows both mutant gene expression and the resulting ultrastructural features to be correlated with the sequence of virus replicative events. Three ts mutant-triggered features not previously described in HSV-1-infected cells were also recognized: a modification of rough endoplasmic reticulum, intranuclear accumulation of enveloped virus particles and cytoplasmic accumulation of novel doughnut-shaped particles having a concentric double ring appearance in thin section.

Keywords: HSV-1, ultrastructure, ts mutants, blocked replication

Received 24 August 1982; accepted 19 January 1983.