Genetically-modified brewing yeasts for the 21st century. Progress to date

Area of Science:

• * Microbiology and Yeast Genetics
• * Biotechnology and Brewing Science

Background:

• * Traditional yeast breeding relies on sporulation and mating, which are problematic in brewing yeast strains.
• * Brewing yeasts exhibit poor sporulation, low spore viability, and non-mating haploid progeny, hindering conventional breeding efforts.

Purpose of the Study:

• * To explore the application of modern breeding techniques for developing improved brewing yeast strains.
• * To overcome the limitations of traditional breeding in creating novel yeast varieties for the brewing industry.

Main Methods:

• * Development and application of recombinant-DNA techniques for specific yeast strain improvement.
• * Selection and testing of genetically modified yeast strains for desirable brewing characteristics.

Main Results:

• * Successful development of brewing yeast strains with enhanced fermentation capabilities (e.g., wider carbohydrate utilization).
• * Creation of yeast strains with modified flocculation properties and altered flavor profiles in beer.
• * One amylolytic brewing yeast strain has been approved for commercial application after pilot-scale testing.

Conclusions:

• * Recombinant-DNA technology has revolutionized the breeding of brewing yeast, overcoming limitations of traditional methods.
• * Genetically improved yeast strains offer significant potential for enhancing beer production and quality.
• * Commercialization of a novel amylolytic brewing yeast validates the success of these advanced breeding strategies.