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Efficient Sporulation of Saccharomyces cerevisiae in a 96 Multiwell Format
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Unlocking the functional potential of polyploid yeasts.

Simone Mozzachiodi1,2, Kristoffer Krogerus3, Brian Gibson3,4

  • 1Université Côte d'Azur, CNRS, INSERM, IRCAN, Nice, France. simone.mozzachiodi@univ-cotedazur.fr.

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Industrial yeast strains can now be improved using a novel Return-to-Mitotic-Growth (RTG) method. This non-GMO approach induces genetic recombination, enabling rapid development of superior strains for biotechnology applications.

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Area of Science:

  • Microbiology and Biotechnology
  • Yeast Genetics and Strain Improvement

Background:

  • Industrial Saccharomyces cerevisiae strains often possess complex polyploid genomes and sterility, hindering traditional breeding-based genetic improvement.
  • Existing genetic improvement strategies are limited for sterile, polyploid industrial yeast strains.

Purpose of the Study:

  • To develop a novel, non-GMO strain improvement approach for industrial yeast.
  • To leverage the genetic recombination potential of interrupted meiosis followed by return-to-mitotic-growth (RTG) for strain enhancement.

Main Methods:

  • Utilized the Return-to-Mitotic-Growth (RTG) property in sterile, polyploid industrial yeast strains.
  • Developed a visual screening method for high-throughput identification of recombined RTG clones based on colony phenotypes.
  • Sequenced evolved clones to analyze RTG-induced genome-wide recombination.

Main Results:

  • Demonstrated RTG-competence in two unrelated sterile industrial Saccharomyces cerevisiae strains with triploid and tetraploid genomes.
  • Observed unprecedented levels of genome-wide recombination induced by the RTG process.
  • Generated and phenotyped an RTG library, identifying clones with superior biotechnological traits.

Conclusions:

  • The RTG-framework offers a fully non-GMO workflow for rapid improvement of industrial yeasts.
  • This method facilitates the development of enhanced yeast strains with desirable biotechnological characteristics.
  • The RTG approach provides a viable alternative for improving sterile, polyploid industrial yeast strains.