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Updated: Aug 3, 2026
Rapid Identification of Chemical Genetic Interactions in Saccharomyces cerevisiae
Published on: April 5, 2015
Fluphenazine-resistant Saccharomyces cerevisiae mutants defective in the cell division cycle
Abstract:
An fls1 mutant of Saccharomyces cerevisiae, which did not grow in the presence of 30 micrograms of fluphenazine per ml, was isolated. Mutants that were resistant to 90 micrograms of fluphenazine per ml and temperature sensitive for growth were obtained from the fls1 mutant. One fluphenazine-resistance mutation, fsr1, was located near the his7 locus on chromosome II. Growth of the fsr1 mutants at 35 degrees C was arrested after nuclear division. The other group of fluphenazine-resistant mutants, carrying fsr2 mutations, showed Ca2+-dependent growth at 35 degrees C. Growth of the fsr2 mutants at 35 degrees C was arrested at the G2 stage of the cell cycle in Ca2+-poor medium.
Insights
Researchers isolated a Saccharomyces cerevisiae fls1 mutant and developed fluphenazine-resistant mutants. These mutants, fsr1 and fsr2, revealed cell cycle arrest points, offering insights into yeast genetics and drug resistance mechanisms.
Area of Science:
- * Molecular biology
- * Yeast genetics
- * Cell cycle regulation
Background:
- * Fluphenazine is a drug that can inhibit growth in certain yeast mutants.
- * Understanding drug resistance mechanisms in Saccharomyces cerevisiae is crucial for genetic studies.
Purpose of the Study:
- * To isolate and characterize novel fluphenazine-resistant mutants in Saccharomyces cerevisiae.
- * To investigate the genetic basis of fluphenazine resistance and its effect on cell cycle progression.
Main Methods:
- * Isolation of fluphenazine-sensitive (fls1) mutants in Saccharomyces cerevisiae.
- * Induction of resistance and temperature sensitivity in fls1 mutants.
- * Genetic mapping of resistance mutations (fsr1) and phenotypic analysis of mutants (fsr2).
Main Results:
- * Isolation of an fls1 mutant sensitive to fluphenazine.
- * Identification of two distinct fluphenazine-resistance mutations: fsr1 and fsr2.
- * fsr1 mutants exhibited cell cycle arrest post-nuclear division at elevated temperatures.
- * fsr2 mutants displayed calcium-dependent growth and G2 stage cell cycle arrest in calcium-poor conditions.
Conclusions:
- * The fsr1 mutation is linked to chromosome II and affects post-nuclear division.
- * The fsr2 mutation confers calcium-dependent growth and impacts the G2 stage of the cell cycle.
- * These findings contribute to understanding yeast cell cycle control and fluphenazine resistance mechanisms.
