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. 1984 Jun;3(6):1435–1440. doi: 10.1002/j.1460-2075.1984.tb01989.x

Comparison of a forward and a reverse mutation assay in Salmonella typhimurium measuring L-arabinose resistance and histidine prototrophy.

M Ruiz-Rubio, C Hera, C Pueyo
PMCID: PMC557535  PMID: 6378623

Abstract

A forward and a reverse mutation assay designed to detect environmental mutagens have been compared in Salmonella typhimurium. The forward mutation assay scored resistance to L-arabinose and the reverse assay, reversion of histidine auxotrophy. Eighteen chemicals of different structural groups, all known to be mutagenic in the histidine reverse assay, were applied to strains carrying the genetic markers needed to perform both mutation assays. The mutagenicity of each chemical was determined by both plate and liquid tests. The plate test counted absolute numbers of surviving mutants and the liquid test separately measured survival and frequency of mutants among the survivors. All the chemicals used were found to be mutagenic in both mutation assays. The response of the L-arabinose assay was equal to or larger than the response of the histidine assay in the case of 16 chemicals. The two other compounds, 2-nitrofluorene and sodium azide, were detected more efficiently by the histidine assay. Sodium azide, a non-carcinogenic compound, is a potent mutagen in the histidine assay, but very weak in the L-arabinose assay.

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Selected References

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