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Frequent ploidy changes in growing yeast cultures
Yaniv Harari1, Yoav Ram2, Martin Kupiec3
1School of Molecular Cell Biology & Biotechnology, Tel Aviv University, Ramat Aviv, 69978, Tel Aviv, Israel.
Current Genetics
|March 12, 2018
Summary
Whole-genome duplications, or changes in ploidy, occur frequently in yeast through endoreduplication or mating type switching. While often selected against, these ploidy changes can drive adaptation and genomic instability.
Area of Science:
- Cell Biology
- Evolutionary Biology
- Genetics
Background:
- Ploidy, a stable cellular characteristic, rarely changes but significantly impacts long-term adaptations.
- Ploidy changes can lead to genomic instability, chromosome loss, mutations, and cancer promotion.
- Measuring the rate of whole-genome duplications is challenging.
Purpose of the Study:
- To measure the rate of spontaneous diploidization in yeast.
- To identify the mechanisms driving diploidization.
- To understand the selective pressures on diploidization.
Main Methods:
- Long-term, in-lab experiments with yeast.
- Monitoring for spontaneous diploidization events.
Main Results:
- Spontaneous diploidization occurs frequently in yeast.
- Two primary mechanisms identified: endoreduplication and mating type switching.
- Diploidization is typically selected against but can be advantageous under stress.
Conclusions:
- Ploidy changes are more common than previously thought.
- Understanding ploidy dynamics is crucial for evolutionary insights and biotechnology.
- Yeast serves as a valuable model for studying ploidy instability and adaptation.
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