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The Genetic Basis of Natural Variation in Oenological Traits in Saccharomyces cerevisiae.

Journal article
Authors Francisco Salinas
Francisco A Cubillos
Daniela Soto
Verónica Garcia
Anders Bergström
Jonas Warringer
M Angélica Ganga
Edward J Louis
Gianni Liti
Claudio Martinez
Published in PloS one
Volume 7
Issue 11
Pages e49640
ISSN 1932-6203
Publication year 2012
Published at Department of Chemistry and Molecular Biology
Pages e49640
Language en
Links dx.doi.org/10.1371/journal.pone.004...
https://gup.ub.gu.se/file/92112
Subject categories Genetics, Functional genomics

Abstract

Saccharomyces cerevisiae is the main microorganism responsible for wine alcoholic fermentation. The oenological phenotypes resulting from fermentation, such as the production of acetic acid, glycerol, and residual sugar concentration are regulated by multiple genes and vary quantitatively between different strain backgrounds. With the aim of identifying the quantitative trait loci (QTLs) that regulate oenological phenotypes, we performed linkage analysis using three crosses between highly diverged S. cerevisiae strains. Segregants from each cross were used as starter cultures for 20-day fermentations, in synthetic wine must, to simulate actual winemaking conditions. Linkage analysis on phenotypes of primary industrial importance resulted in the mapping of 18 QTLs. We tested 18 candidate genes, by reciprocal hemizygosity, for their contribution to the observed phenotypic variation, and validated five genes and the chromosome II right subtelomeric region. We observed that genes involved in mitochondrial metabolism, sugar transport, nitrogen metabolism, and the uncharacterized ORF YJR030W explained most of the phenotypic variation in oenological traits. Furthermore, we experimentally validated an exceptionally strong epistatic interaction resulting in high level of succinic acid between the Sake FLX1 allele and the Wine/European MDH2 allele. Overall, our work demonstrates the complex genetic basis underlying wine traits, including natural allelic variation, antagonistic linked QTLs and complex epistatic interactions between alleles from strains with different evolutionary histories.

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