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Assessing Drug Sensitivity in Fission Yeast Using Half-Maximal Inhibitory Concentration (IC50) Assays
Mohammed Ayan Chhipa1, Samantha A Sanayhie2, Sarah A Sabatinos3,4
1Molecular Science Program, Yeates School of Graduate Studies, Toronto Metropolitan University, Toronto, ON, Canada.
Abstract:
Fission yeast is an excellent model organism in which to study mammalian drug sensitivities. In addition to building a mechanistic picture of drug effect, fission yeast screens may be valuable in determining compounds that show synthetic lethality effects. While compounds might be screened for a variety of phenotypes, an effective method is to detect the proliferative effects of a new compound on a yeast culture. This is traditionally performed in acute viability assays or spot tests; both methods require some knowledge of concentration to observe an effect. Mammalian cell culture experiments that assess proliferation to indicate drug dose and effect are well described. However, differences between S. pombe growth characteristics and mammalian cells mean that importing a mammalian viability assay requires consideration of potential effects on fission yeast biology. We describe the half-maximum inhibitory (IC50) dose as a method of rapid proliferation effect screening. IC50 determination is performed on liquid cultures in 96-well plates and may be developed for initial compound library uses or in synthetic lethality screening of drug effects.
Insights
Fission yeast offers a model for studying drug effects and synthetic lethality. Researchers describe using the half-maximum inhibitory (IC50) dose in liquid cultures for rapid proliferation screening of compounds.
Area of Science:
- Microbiology
- Pharmacology
- Genetics
Background:
- Fission yeast (Schizosaccharomyces pombe) serves as a model organism for studying mammalian drug sensitivities and identifying compounds with synthetic lethality effects.
- Traditional methods for assessing compound effects on yeast proliferation, such as acute viability assays and spot tests, require prior knowledge of effective concentrations.
- Adapting mammalian cell culture proliferation assays to fission yeast necessitates careful consideration of species-specific growth characteristics.
Purpose of the Study:
- To present the half-maximum inhibitory (IC50) dose determination as a rapid screening method for assessing compound proliferation effects in fission yeast.
- To establish a protocol for IC50 determination in liquid cultures suitable for initial compound library screening and synthetic lethality studies.
Main Methods:
- Utilizing liquid cultures in 96-well plates for high-throughput screening.
- Determining the half-maximum inhibitory (IC50) dose, which represents the compound concentration inhibiting 50% of cell proliferation.
- Adapting proliferation assays commonly used in mammalian cell culture for fission yeast.
Main Results:
- The described IC50 determination method allows for rapid assessment of compound effects on fission yeast proliferation.
- This approach is adaptable for initial screening of compound libraries to identify potential drug candidates.
- The method is suitable for subsequent synthetic lethality screening to uncover novel drug interactions.
Conclusions:
- The IC50 dose determination in liquid cultures provides an efficient and scalable method for evaluating compound efficacy in fission yeast.
- This technique facilitates the identification of compounds affecting cell proliferation and supports synthetic lethality screening.
- Fission yeast, using this IC50 assay, can be effectively employed for drug discovery and mechanistic studies relevant to mammalian systems.
