Performance and robustness analysis reveals phenotypic trade-offs in yeast

Area of Science:

• Biotechnology
• Microbial Engineering
• Industrial Microbiology

Background:

• Designing robust microbial strains is essential for efficient industrial bioprocesses.
• Perturbations in industrial settings can significantly impact strain performance.
• Understanding performance-robustness trade-offs is key for strain development.

Purpose of the Study:

• To assess the performance and robustness of Saccharomyces cerevisiae strains under simulated industrial perturbations.
• To experimentally map the trade-offs between performance and robustness for multiple phenotypes.
• To identify robust and high-performing strains for lignocellulosic bioethanol production.

Main Methods:

• Cultivation of 24 Saccharomyces cerevisiae strains under simulated lignocellulosic bioethanol production perturbations.
• Simultaneous assessment of multiple phenotypes including ethanol yield, biomass yield, cell dry weight, and specific growth rate.
• Analysis of correlations between performance and robustness across different phenotypes.

Main Results:

• Observed negative correlations between performance and robustness for ethanol yield, biomass yield, and cell dry weight.
• Positive correlation between specific growth rate performance and robustness, suggesting selection for fast-growing, robust cells.
• The Ethanol Red strain demonstrated high performance and robustness, indicating its suitability for bioproduction under tested conditions.

Conclusions:

• Experimental evidence confirms performance-robustness trade-offs in Saccharomyces cerevisiae for bioethanol production.
• Specific growth rate is a key indicator for selecting robust strains.
• Ethanol Red is a promising candidate strain for industrial lignocellulosic bioethanol production due to its balanced performance and robustness.