Investigating the Influence of Glycerol on the Utilization of Glucose in Yarrowia lipolytica Using RNA-Seq-Based...

Area of Science:

• Microbiology
• Biotechnology
• Molecular Biology

Background:

• Glycerol is a valuable substrate for yeast biotechnological applications.
• Yarrowia lipolytica preferentially utilizes glycerol over glucose, potentially suppressing glucose consumption.
• This contrasts with the well-known glucose repression mechanisms in Saccharomyces cerevisiae.

Purpose of the Study:

• To investigate glycerol repression-like effects in Yarrowia lipolytica at the transcriptional level.
• To understand the converse carbon catabolite repression mechanisms in yeast.

Main Methods:

• High-resolution growth screenings of Yarrowia lipolytica strains under mixed glycerol-glucose conditions.
• Chemostat cultivation of selected strains (IBT and W29) using glucose, glycerol, and mixed carbon sources.
• RNA-Seq based transcriptome analysis to compare gene expression profiles.

Main Results:

• Differential growth phenotypes observed in Yarrowia lipolytica under mixed glycerol-glucose conditions.
• Identification of significantly higher transporter expression in strain W29, correlating with physiological differences.
• Discovery of differentially expressed genes related to signal transduction and transcriptional regulation, suggesting novel carbon source regulation.

Conclusions:

• Yarrowia lipolytica displays unique carbon source regulation mechanisms distinct from Saccharomyces cerevisiae.
• Transcriptome analysis reveals potential novel pathways for glycerol and glucose co-utilization in yeast.
• This study provides foundational insights into yeast metabolic regulation and biotechnological potential.