Abstract
One hundred temperature-sensitive mutants of vaccinia virus WR were isolated from virus that had been mutagenized with 5-bromodeoxyuridine or N-methyl-N'-nitro-N-nitrosoguanidine. A rapid screening procedure based on the ability of vaccinia virus to form plaques under liquid overlay medium was used to identify potential mutants among randomly picked plaque isolates or plaques preselected for their small size after temperature shift-up. The preselection technique resulted in a sixfold increase in the number of successful mutant isolations relative to the number of plaques picked. All of the mutants had efficiencies of plating at 39.5 degrees C relative to that at 33 degrees C of 10(-4) or less, and 33 of 40 produced 10% or less of the amount of virus at the nonpermissive temperature (39.5 degrees C) relative to that at the permissive temperature (33 degrees C). Experiments with the fluorescent DNA binding dye Hoechst 33258 demonstrated that 6 of the 100 mutants failed to form characteristic cytoplasmic DNA factories at 39.5 degrees C. To facilitate the functional grouping of such a large number of mutants, a rapid infectious center assay was developed. Thirty of the mutants were assigned to 16 or 17 complementation-recombination groups by using this assay. Recombination experiments have allowed the construction of a genetic map representing 22 mutants in 12 of these groups.
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Selected References
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