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Genetics logoLink to Genetics
. 1989 Dec;123(4):625–633. doi: 10.1093/genetics/123.4.625

Genetic Analysis of Temperature-Sensitive Lethal Mutants of Salmonella Typhimurium

M B Schmid 1, N Kapur 1, D R Isaacson 1, P Lindroos 1, C Sharpe 1
PMCID: PMC1203875  PMID: 2558954

Abstract

We have isolated 440 mutants of Salmonella typhimurium that show temperature-sensitive growth on complex medium at 44°. Approximately 16% of the mutations in these strains have been mapped to 17 chromosomal locations; two of these chromosomal locations seem to include several essential genes. Genetic analysis of the mutations suggests that the collection saturates the genes readily mutable to a ts lethal phenotype in S. typhimurium. Physiological characteristics of the ts lethal mutants were tested: 6% of the mutants can grow at high temperature under anaerobic conditions, 17% can grow when the medium includes 0.5 M KCl, and 9% of the mutants die after a 2-hr incubation at the nonpermissive temperature. Most ts lethal mutations in this collection probably affect genes required for growth at all temperatures (not merely during high temperature growth) since Tn10 insertions that cause a temperature-sensitive lethal phenotype are rare.

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Selected References

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