Abstract
Wine yeast strains show a high level of chromosome length polymorphism. This polymorphism is mainly generated by illegitimate recombination mediated by Ty transposons or subtelomeric repeated sequences. We have found, however, that the SSU1-R allele, which confers sulfite resistance to yeast cells, is the product of a reciprocal translocation between chromosomes VIII and XVI due to unequal crossing-over mediated by microhomology between very short sequences on the 5' upstream regions of the SSU1 and ECM34 genes. We also show that this translocation is only present in wine yeast strains, suggesting that the use for millennia of sulfite as a preservative in wine production could have favored its selection. This is the first time that a gross chromosomal rearrangement is shown to be involved in the adaptive evolution of Saccharomyces cerevisiae.
MeSH Terms
Anion Transport Proteins/genetics
Base Sequence/genetics
Chromosomes, Fungal/genetics
DNA, Fungal/genetics
Evolution, Molecular
Gene Frequency/genetics
Gene Rearrangement/genetics
Genes, Fungal/genetics
Genetic Markers/genetics
Genome, Fungal
Molecular Sequence Data
Recombination, Genetic/genetics
Saccharomyces cerevisiae/genetics
Saccharomyces cerevisiae Proteins/genetics
Species Specificity
Translocation, Genetic/genetics
Chemicals
Anion Transport Proteins
DNA, Fungal
Genetic Markers
Saccharomyces cerevisiae Proteins
Ssu1 protein, S cerevisiae
Authors & Affiliations
4 authors, click to expand affiliations / ORCID
Pérez-Ortín José E
Departament de Bioquímica i Biologia Molecular, Universitat de València, Spain. jose.e.perez@uv.es
Querol Amparo
Puig Sergi
Barrio Eladio
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