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Use of nystatin to eliminate spontaneous revertants in yeast
Abstract:
Studies of induction of suppressor mutants may be obscured by revertants already present in the treated population. Such revertants, which appear as a minority of prototrophs among auxotrophs, can be eliminated by pretreatment with nystatin before application of the mutagen. Treatment with nystatin, under the proper conditions, decreased the frequency of prototrophs about 30-fold. This is sufficient for studying induced mutation at frequencies close to the spontaneous frequency.
Insights
Nystatin pretreatment effectively removes prototroph revertants, a common issue in suppressor mutant studies. This method significantly reduces background noise, enabling clearer observation of induced mutations.
Area of Science:
- Microbiology
- Genetics
- Molecular Biology
Background:
- Induction of suppressor mutants is crucial for genetic research.
- Pre-existing revertants in cell populations can obscure studies on induced mutations.
- Auxotrophs typically contain a minority of prototroph revertants.
Purpose of the Study:
- To develop a method for eliminating background prototroph revertants.
- To improve the accuracy of studies investigating induced suppressor mutations.
Main Methods:
- Utilized nystatin as a pretreatment agent.
- Applied nystatin under specific, optimized conditions.
- Administered mutagen after nystatin treatment to assess induced mutation frequency.
Main Results:
- Nystatin pretreatment significantly decreased the frequency of prototroph revertants.
- A reduction of approximately 30-fold in prototroph frequency was observed.
- This reduction is sufficient to study induced mutation rates near spontaneous levels.
Conclusions:
- Nystatin pretreatment is an effective strategy to eliminate background revertants.
- This technique enhances the study of induced mutations by reducing experimental noise.
- The method allows for more accurate analysis of mutation induction frequencies.
