Microbe Profile: Saccharomyces eubayanus, the missing link to lager beer yeasts

Area of Science:

• Microbiology
• Yeast Genetics
• Brewing Science

Background:

• Saccharomyces eubayanus was recently identified, resolving the origin of cold-tolerant lager yeast.
• The genetic diversity of S. eubayanus is primarily found in South America, with no European strains discovered.
• Hybridization between S. eubayanus and S. cerevisiae created S. pastorianus, the allopolyploid yeast essential for global lager production.

Purpose of the Study:

• To discuss the implications of identifying Saccharomyces eubayanus as the missing progenitor of lager yeast.
• To explore new research avenues in brewing yeast, including selective breeding and the use of S. eubayanus in novel fermentation.

Main Methods:

• Literature review on the discovery and genetic diversity of Saccharomyces eubayanus.
• Analysis of hybridization events leading to Saccharomyces pastorianus.
• Discussion of current applications and future potential of S. eubayanus in brewing.

Main Results:

• The origin of lager brewing yeast is now understood through the identification of S. eubayanus.
• Significant genetic diversity of S. eubayanus exists in South America.
• Commercial beer fermented solely by S. eubayanus is now available, showcasing its brewing potential.

Conclusions:

• The identification of S. eubayanus has revolutionized brewing yeast research.
• Selective breeding of new lager strains is now possible.
• S. eubayanus presents unique brewing characteristics, expanding the possibilities for beer fermentation.