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. 1976 Nov;20(2):487–500. doi: 10.1128/jvi.20.2.487-500.1976

Respiratory syncytial virus ts mutants and nuclear immunofluorescence.

G P Faulkner, P V Shirodaria, E A Follett, C R Pringle
PMCID: PMC355016  PMID: 62058

Abstract

A replicated sector-plating procedure was used to isolate 35 induced temperature-sensitive (ts) mutants and one spontaneous ts mutant from a wild-type stock of respiratory syncytial (RS) virus cloned from recent clinical material. Seven of these mutants were ts for plaque formation at 37 degrees C as well as at the restrictive temperature of 39 degrees C. The wild-type strain did not differ markedly from standard laboratory strains of RS virus. It was dependent on exogenous arginine (84 mug/ml) for optimal growth, and was not significantly inhibited by mitomycin C (10 mug/ml). It was sensitive to actinomycin D (2.5 mug/ml) during the early part of the growth phase. A characteristic focal cytopathic effect was obtained in BS-C-1 cells. Staining of infected monolayers by an indirect immunofluorescence procedure revealed a profusion of filamentous processes extending from the plasma membrane, and a similar modification of the surface of infected cells could be visualized by scanning electron microscopy. Filament production was inhibited when certain ts mutants were incubated at 39 degrees C, confirming the virus-specific nature of the phenomenon. Thirty-four of the mutants were classified into three groups by immunofluorescence. Complementation was observed in mixed infection with a single mutant from each group. Nuclear, as well as cytoplasmic, immunofluorescence was detected in RS virus-infected cells using a high-titer bovine anti-bovine RS virus serum. Visualization of nuclear antigen was dependent on the inhibition of cytoplasmic fluorescence obtained when ts mutants in groups I and III were incubated at restrictive temperature.

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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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