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. 1994 Jun;68(6):3761–3772. doi: 10.1128/jvi.68.6.3761-3772.1994

Neuron-specific restriction of a herpes simplex virus recombinant maps to the UL5 gene.

D C Bloom 1, J G Stevens 1
PMCID: PMC236881  PMID: 8189514

Abstract

We have previously shown that, when compared with either parent, a herpes simplex virus type 1/herpes simplex virus type 2 intertypic recombinant (R13-1) is attenuated by 10,000-fold with respect to neurovirulence in mice. Despite this, after intracranial inoculation, R13-1 replicated to titers of 10(5) PFU per brain. We present evidence that the restriction is specific for replication in neurons and have taken a three-step approach in determining the basis of the attenuation by (i) characterizing cellular tropism of the virus in both central and peripheral nervous systems, (ii) defining where in the viral replication cycle the restriction is manifest, and (iii) identifying the genetic basis of the restriction through marker rescue analysis. Following inoculation into the animal, R13-1 viral antigens predominate in nonneuronal cells, and the block to replication in neurons was found to be beyond the level of adsorption and penetration. Despite the restricted replication within neurons, the virus established a latent infection in spinal ganglia and could be reactivated by in vitro cocultivation of the ganglia. In studies carried out in cell culture, R13-1 was found to replicate normally in mouse embryo fibroblasts and primary mouse glial cells but was restricted by 1,000-fold in primary mouse neurons and PC12 cells. R13-1 appeared to produce normal levels of early RNA in these cells, but production of DNA and late RNA was less than that of the wild type. Marker rescue analysis localized the fragment responsible for restoring neurovirulence to UL5, a component of the origin-binding complex implicated in replication of the viral genome. Our results with this virus, with a cell-specific restriction, suggest that a neuron-specific component is involved in viral replication.

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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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