Population structure and reticulate evolution of Saccharomyces eubayanus and its lager-brewing hybrids

David Peris, Kayla Sylvester, Diego Libkind, Paula Gonçalves, José Paulo Sampaio, William G. Alexander, Chris Todd Hittinger

Research output: Contribution to journalArticle

67 Citations (Scopus)

Abstract

Reticulate evolution can be a major driver of diversification into new niches, especially in disturbed habitats and at the edges of ranges. Industrial fermentation strains of yeast provide a window into these processes, but progress has been hampered by a limited understanding of the natural diversity and distribution of Saccharomyces species and populations. For example, lager beer is brewed with Saccharomyces pastorianus, an alloploid hybrid of S. cerevisiae and S. eubayanus, a species only recently discovered in Patagonia, Argentina. Here, we report that genetically diverse strains of S. eubayanus are readily isolated from Patagonia, demonstrating that the species is well established there. Analyses of multilocus sequence data strongly suggest that there are two diverse and highly differentiated Patagonian populations. The low nucleotide diversity found in the S. eubayanus moiety of hybrid European brewing strains suggests that their alleles were drawn from a small subpopulation that is closely related to one of the Patagonian populations. For the first time, we also report the rare isolation of S. eubayanus outside Patagonia, in Wisconsin, USA. In contrast to the clear population differentiation in Patagonia, the North American strains represent a recent and possibly transient admixture of the two Patagonian populations. These complex and varied reticulation events are not adequately captured by conventional phylogenetic methods and required analyses of Bayesian concordance factors and phylogenetic networks to accurately summarize and interpret. These findings show how genetically diverse eukaryotic microbes can produce rare but economically important hybrids with low genetic diversity when they migrate from their natural ecological context.

Original languageEnglish
Pages (from-to)2031-2045
Number of pages15
JournalMolecular Ecology
Volume23
Issue number8
DOIs
Publication statusPublished - Apr 2014

Fingerprint

Saccharomyces
brewing
population structure
Argentina
Population
phylogenetics
subpopulation
fermentation
yeast
niche
allele
Multilocus Sequence Typing
allopolyploidy
Bayes Theorem
phylogeny
beers
Fermentation
habitat
Ecosystem
Saccharomyces cerevisiae

Keywords

  • admixture
  • hybridization
  • lager beer
  • phylogeography
  • Saccharomyces eubayanus
  • Saccharomyces pastorianus

Cite this

Peris, David ; Sylvester, Kayla ; Libkind, Diego ; Gonçalves, Paula ; Sampaio, José Paulo ; Alexander, William G. ; Hittinger, Chris Todd. / Population structure and reticulate evolution of Saccharomyces eubayanus and its lager-brewing hybrids. In: Molecular Ecology. 2014 ; Vol. 23, No. 8. pp. 2031-2045.
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Population structure and reticulate evolution of Saccharomyces eubayanus and its lager-brewing hybrids. / Peris, David; Sylvester, Kayla; Libkind, Diego; Gonçalves, Paula; Sampaio, José Paulo; Alexander, William G.; Hittinger, Chris Todd.

In: Molecular Ecology, Vol. 23, No. 8, 04.2014, p. 2031-2045.

Research output: Contribution to journalArticle

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