Saccharomyces yeast hybrids on the rise

Area of Science:

• Yeast genetics and genomics
• Evolutionary biology
• Speciation research

Background:

• Saccharomyces hybrid yeasts are increasingly utilized as model organisms for studying adaptation and speciation.
• Genomic resources for Saccharomyces species and hybrids are available but skewed towards Saccharomyces cerevisiae.
• Recent research shows a growing interest in wild and newly discovered yeast species.

Purpose of the Study:

• To compile and present current genomic resource statistics for Saccharomyces species and hybrids.
• To update the Saccharomyces species phylogeny using orthogroup inference.
• To analyze hybrid spore viability across the Saccharomyces genus to understand reproductive isolation.

Main Methods:

• Compilation of genomic data from public repositories.
• Orthogroup inference for species phylogeny construction.
• Reanalysis of published hybrid spore viability data across 28 cross types and 371 independent crosses.

Main Results:

• Genomic resources are predominantly focused on Saccharomyces cerevisiae, with increasing use of wild species.
• Hybrid viability generally decreases with increasing parental genetic distance, influenced by antirecombination and epistasis.
• Intraspecific cross viability shows wide variation, and geographic/ecological origins offer partial prediction of cross success.

Conclusions:

• Saccharomyces hybrid yeasts offer significant potential for research and development, particularly in experimental evolution and fermentation.
• Understanding reproductive isolation in hybrids requires considering genetic distance, structural variation, and ploidy.
• Further research into wild Saccharomyces species and their hybrids is crucial for advancing evolutionary and biotechnological insights.