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. 1985 Aug;55(2):338–346. doi: 10.1128/jvi.55.2.338-346.1985

Herpes simplex virus 1 mutant deleted in the alpha 22 gene: growth and gene expression in permissive and restrictive cells and establishment of latency in mice.

A E Sears, I W Halliburton, B Meignier, S Silver, B Roizman
PMCID: PMC254938  PMID: 2991560

Abstract

R325-beta TK+, a herpes simplex virus 1 mutant carrying a 500-base-pair deletion in the alpha 22 gene and the wild-type (beta) thymidine kinase (TK) gene, was previously shown to grow efficiently in HEp-2 and Vero cell lines. We report that in rodent cell lines exemplified by the Rat-1 line, plating efficiency was reduced and growth was multiplicity dependent. A similar multiplicity dependence for growth and lack of virus spread at low multiplicity was seen in resting, confluent human embryonic lung (HEL) cells. The shutoff of synthesis of beta proteins was delayed and the duration of synthesis of gamma proteins was extended in R325-beta TK+-infected HEL cells relative to cells infected with the wild-type parent, but no significant differences were seen in the total accumulation of viral DNA. To quantify the effect on late (gamma 2) gene expression, a recombinant carrying the deletion in the alpha 22 gene and a gamma 2-TK gene (R325-gamma 2 TK) was constructed and compared with a wild-type virus (R3112) carrying a chimeric gamma 2-TK gene. In Vero cells, the gamma 2-TK gene of R325-gamma 2TK was expressed earlier than and at the same level as the gamma 2-TK gene of R3112. In the confluent resting HEL cells, the expression of the gamma 2-TK gene of the alpha 22- virus was grossly reduced relative to that of the alpha 22+ virus. Electron microscopic studies indicated that the number of intranuclear capsids of R325-beta TK+ virus was reduced relative to that of the parent virus in resting confluent HEL cells, but the number of DNA-containing capsids was higher. Notwithstanding the grossly reduced neurovirulence on intracerebral inoculation in mice, R325-beta TK+ virus was able to establish latency in mice. We conclude that (i) the alpha 22 gene affects late (gamma 2) gene expression, and (ii) a host cell factor complements that function of the alpha 22 gene to a greater extent in HEp-2 and Vero cells than in confluent, resting HEL cells.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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