Global distribution of IRC7 alleles in Saccharomyces cerevisiae populations: a genomic and phenotypic survey within the wine clade

Javier Ruiz, Miguel de Celis, María Martín-Santamaría, Iván Benito-Vázquez, Ana Pontes, Val Fernández Lanza, José Paulo Sampaio, Antonio Santos, Ignacio Belda

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

The adaptation to the different biotic and abiotic factors of wine fermentation has led to the accumulation of numerous genomic hallmarks in Saccharomyces cerevisiae wine strains. IRC7, a gene encoding a cysteine-S-β-lyase enzyme related volatile thiols production in wines, has two alleles: a full-length allele (IRC7F) and a mutated one (IRC7S), harbouring a 38 bp-deletion. Interestingly, IRC7S-encoding a less active enzyme – appears widespread amongst wine populations. Studying the global distribution of the IRC7S allele in different yeast lineages, we confirmed its high prevalence in the Wine clade and demonstrated a minority presence in other domesticated clades (Wine-PDM, Beer and Bread) while it is completely missing in wild clades. Here, we show that IRC7S-homozygous (HS) strains exhibited both fitness and competitive advantages compared with IRC7F-homozygous (HF) strains. There are some pieces of evidence of the direct contribution of the IRC7S allele to the outstanding behaviour of HS strains (i.e., improved response to oxidative stress conditions and higher tolerance to high copper levels); however, we also identified a set of sequence variants with significant co-occurrence patterns with the IRC7S allele, which can be co-contributing to the fitness and competitive advantages of HS strains in wine fermentations.

Original languageEnglish
Pages (from-to)3182-3195
Number of pages14
JournalEnvironmental Microbiology
Volume23
Issue number6
DOIs
Publication statusPublished - Jun 2021

Keywords

  • Alleles
  • Carbon-Sulfur Lyases/genetics
  • Fermentation
  • Genomics
  • Saccharomyces cerevisiae/genetics
  • Saccharomyces cerevisiae Proteins/genetics
  • Wine/analysis

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