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Karin Voordeckers1,2, Jacek Kominek1,2, Anupam Das3

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Summary
This summary is machine-generated.

Yeast evolved increased ethanol tolerance through a combination of genetic changes, including mutations and ploidy shifts. These adaptations involve stress response and DNA repair pathways, offering insights for improving industrial yeast strains.

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Area of Science:

  • Microbiology
  • Evolutionary Biology
  • Genetics

Background:

  • High ethanol tolerance is crucial for microbial industrial applications.
  • The genetic basis for ethanol tolerance in yeast is complex and not fully understood.

Purpose of the Study:

  • To investigate the molecular mechanisms of yeast adaptation to high ethanol levels.
  • To identify genetic factors contributing to increased ethanol tolerance through experimental evolution.

Main Methods:

  • Long-term experimental evolution of yeast populations with varying ploidy.
  • Whole-genome sequencing of evolved populations and clones.
  • Analysis using a novel computational pipeline (PheNetic).
  • Fitness assays of specific mutations in non-evolved yeast.

Main Results:

  • Adaptation involved a combination of mutations, copy number variation, and ploidy changes.
  • Mutations targeted functional modules in stress response, cell cycle, DNA repair, and respiration.
  • Identified novel adaptive mutations in PRT1, VPS70, and MEX67, with VPS70 variation linked to industrial ethanol tolerance.

Conclusions:

  • Adaptation to continuous, severe stress like high ethanol involves diverse evolutionary mechanisms.
  • Identified key genetic modules and specific mutations for enhancing ethanol resistance in industrial yeast.