Physical cell-cell contact elicits specific transcriptomic responses in wine yeast species

Area of Science:

• Microbial Ecology
• Molecular Biology
• Yeast Genetics

Background:

• Grape juice fermentation involves complex yeast and bacterial ecosystems.
• Molecular mechanisms of yeast-yeast interactions, especially physical contact, are poorly understood.
• Understanding these interactions is crucial for wine fermentation and microbial ecology.

Purpose of the Study:

• To investigate the transcriptomic response of Saccharomyces cerevisiae and Lachancea thermotolerans to physical interspecies contact.
• To elucidate the molecular mechanisms underlying yeast responses to co-culture.
• To explore how physical interactions influence gene expression and adaptation in the wine ecosystem.

Main Methods:

• Transcriptomic analysis of Saccharomyces cerevisiae and Lachancea thermotolerans under physical versus metabolic contact conditions.
• Quantitative PCR (qPCR) to validate gene expression changes.
• Comparative analysis of gene regulation in response to species-specific biotic challenges.

Main Results:

• Physical contact induced upregulation of cell wall integrity and H2S production genes in S. cerevisiae.
• HSP stress response genes were significantly upregulated in L. thermotolerans.
• Both species downregulated FLO family genes involved in cellular adhesion.
• Gene expression regulation was species-specific, indicating adaptive responses.

Conclusions:

• Yeast species actively modulate gene expression in response to physical interspecies contact.
• These transcriptional changes are critical for adapting to the wine ecosystem and managing interspecies competition.
• Findings provide fundamental insights into yeast ecology and evolutionary adaptations, with implications for biotechnological applications.