Yeast Allele Engineering for Fermentation Efficiency
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Solution Overview
Problem
Current industrial yeast strains for fermentation processes, such as Saccharomyces cerevisiae, only represent a small fraction of natural diversity, limiting their efficiency, stress resistance, substrate range, and specific aroma profiles, which are essential for industrial applications like biofuels and pharmaceuticals.
Innovation Solution
Identification and utilization of mutant alleles like ALD6, SUC2, IMA1, and URK1 through high-throughput phenotyping and CRISPR-Cas technology to engineer yeast strains with enhanced traits, such as increased acetic acid production, reduced ethanol production, and increased isobutanol production, by disrupting or deleting specific genes to alter metabolic pathways.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If current industrial yeast strains are used, then fermentation processes can be maintained with existing efficiency, but the strains cannot achieve increased fermentation efficiency, stress resistance, substrate range, or specific aroma profiles due to limited genetic diversity
Solution Approach 1:
The patent applies parameter changes by modifying specific genetic parameters (alleles) of the yeast strain. High-throughput phenotyping and genomics were used to identify specific alleles associated with desirable traits, and CRISPR-Cas9 was used to introduce precise genetic modifications at identified loci, thereby changing the genetic parameters to achieve improved fermentation efficiency and stress resistance
2Productivity
If the full natural diversity of S. cerevisiae strains is utilized, then industrially relevant traits can be improved, but the complexity of strain selection and characterization increases significantly
Solution Approach 1:
The patent replaces traditional mechanical/physical strain characterization methods with genomic-based identification. By using whole-genome sequencing and association analysis, the invention substitutes phenotypic screening with genotypic prediction, allowing rapid identification of strains with desirable traits without extensive phenotypic testing
Solution Approach 2:
The patent creates genetic copies of desirable alleles identified in natural strains. Through CRISPR-Cas9-mediated allele replacement, the invention copies specific functional variants from diverse S. cerevisiae strains and introduces them into industrial strain backgrounds, thereby reproducing desirable traits in a controlled manner
3Reliability
If multiple gene modifications are introduced to achieve multiple industrially relevant traits, then the overall performance of yeast strains improves, but the manufacturing complexity and time required for strain development increases
Solution Approach 1:
The patent performs preliminary action by conducting genome-wide association studies and high-throughput phenotyping before strain construction. This upfront genomic characterization identifies target alleles and predicts their effects, allowing researchers to plan multiple gene modifications in advance rather than through iterative trial-and-error, thereby reducing overall development time
Solution Approach 2:
The patent segments the strain development process into distinct modular steps: (1) genomic characterization and allele identification, (2) priority ranking of target alleles, (3) CRISPR-Cas9 modification of specific loci, and (4) validation. This segmentation allows parallel processing of multiple gene targets and systematic management of complex multi-gene modifications
Data Source
AI summary
The present invention relates to the field of yeast fermentations. More particularly, the invention relates to mutant alleles useful to engineer industrially relevant traits in yeast.