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Ecological success of a group of Saccharomyces cerevisiae / Saccharomyces kudriavzevii hybrids in the Northern European wine making environment.

ABSTRACT: Ecological success of a group of Saccharomyces cerevisiae / Saccharomyces kudriavzevii hybrids in the Northern European wine making environment.

PROVIDER: PRJNA145633 | ENA |

REPOSITORIES: ENA

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Ecological success of a group of Saccharomyces cerevisiae / Saccharomyces kudriavzevii hybrids in the Northern European wine making environment.

2012-02-09 | GSE31703 | GEO

Ecological success of a group of Saccharomyces cerevisiae / Saccharomyces kudriavzevii hybrids in the Northern European wine making environment.

Project description:The aim of this project was to evaluate the ploidy of a S. cerevisiae *S. kudriavzevii hybrid in comparison to the lab strain S288C. Other wine yeast have been icluded in the project for the global analysis. Comparison of Eg8 (2 arays) , to S288C (3 arrays), other strains V5, U13, Eg25 (2 arrays) are used to enable signal normalization acccross arrays with RMA package.

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Ecological success of a group of Saccharomyces cerevisiae/Saccharomyces kudriavzevii hybrids in the northern european wine-making environment.

Project description:The hybrid nature of lager-brewing yeast strains has been known for 25 years; however, yeast hybrids have only recently been described in cider and wine fermentations. In this study, we characterized the hybrid genomes and the relatedness of the Eg8 industrial yeast strain and of 24 Saccharomyces cerevisiae/Saccharomyces kudriavzevii hybrid yeast strains used for wine making in France (Alsace), Germany, Hungary, and the United States. An array-based comparative genome hybridization (aCGH) profile of the Eg8 genome revealed a typical chimeric profile. Measurement of hybrids DNA content per cell by flow cytometry revealed multiple ploidy levels (2n, 3n, or 4n), and restriction fragment length polymorphism analysis of 22 genes indicated variable amounts of S. kudriavzevii genetic content in three representative strains. We developed microsatellite markers for S. kudriavzevii and used them to analyze the diversity of a population isolated from oaks in Ardèche (France). This analysis revealed new insights into the diversity of this species. We then analyzed the diversity of the wine hybrids for 12 S. cerevisiae and 7 S. kudriavzevii microsatellite loci and found that these strains are the products of multiple hybridization events between several S. cerevisiae wine yeast isolates and various S. kudriavzevii strains. The Eg8 lineage appeared remarkable, since it harbors strains found over a wide geographic area, and the interstrain divergence measured with a (??)(2) genetic distance indicates an ancient origin. These findings reflect the specific adaptations made by S. cerevisiae/S. kudriavzevii cryophilic hybrids to winery environments in cool climates.

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