A cycloheximide-resistant mutant of Tetrahymena pyriformis

Charles Roberts, E. Orias

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

A mutant of Tetrahymena pyriformis, syngen 1, resistant to cycloheximide was obtained after mutagenesis (with N-methyl-N′-nitro-N-nitrosoguanidine) followed by a cross (to obtain macro-nuclear expression of the mutant phenotype). A genetic analysis has shown that cycloheximide resistance in the mutant strain is due to a dominant nuclear allele, designated chx-1. Heterozygotes ( chx-1 chx+) are initially resistant but segregate stable, sensitive cell lines during vegetative growth, demonstrating that allelic exclusion occurs with this determinant, as with many others in syngen 1. This feature, coupled with the selective advantage conferred by the chx-1 allele in the presence of cycloheximide, makes this mutation a useful genetic tool. A strain homozygous for the chx-1 allele exhibits an exponential growth rate identical to that of the wild type in proteose peptone-yeast extract medium in the absence of cycloheximide. In 10 μg/ml of the drug, the resistant cells grow at a somewhat lower rate, after an initial lag and adaptation to the presence of the drug. This concentration causes complete inhibition of growth and eventual lysis of wild-type cells. The cellular basis for cycloheximide resistance and adaptation in the mutant is presently under investigation.

Original languageEnglish (US)
Pages (from-to)312-316
Number of pages5
JournalExperimental Cell Research
Volume81
Issue number2
DOIs
StatePublished - 1973
Externally publishedYes

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Tetrahymena pyriformis
Cycloheximide
Alleles
Growth
Methylnitronitrosoguanidine
Heterozygote
Mutagenesis
Pharmaceutical Preparations
Yeasts
Phenotype
Cell Line
Mutation

ASJC Scopus subject areas

  • Cell Biology

Cite this

A cycloheximide-resistant mutant of Tetrahymena pyriformis. / Roberts, Charles; Orias, E.

In: Experimental Cell Research, Vol. 81, No. 2, 1973, p. 312-316.

Research output: Contribution to journalArticle

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