Engineered Microalga Seipin Knockout for Higher TAG Yield
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The production of triacylglycerols (TAGs) in microalgae is hindered by high biomass production costs due to oil accumulation under stress conditions, which slows or arrests cell growth, and the energy-intensive methods of oil extraction, making third-generation biofuels economically unviable.
Innovation Solution
Silencing the Seipin gene in engineered diatom microalgae, specifically Phaeodactylum tricornutum, using CRISPR/Cas9 technology to target the 1st transmembrane domain, enhances TAG production without affecting cell growth, and facilitates extraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If stress conditions are applied to trigger oil accumulation in microalgae, then TAG production increases, but cell growth slows or arrests
Solution Approach 1:
The patent extracts the harmful constraint by removing the Seipin protein function through genetic modification. By disabling the Seipin gene, the patent eliminates the mechanism that normally limits TAG accumulation, allowing continuous oil production without the typical growth-arresting stress response. This resolves the contradiction by taking out the regulatory bottleneck that forced the trade-off between growth and oil accumulation.
Solution Approach 2:
The patent changes the fundamental parameter of Seipin protein presence/activity in the system. By transitioning from normal Seipin function to Seipin deficiency, the patent alters the lipid metabolism parameters, enabling TAG accumulation to occur without triggering the growth arrest mechanism that normally accompanies stress-induced oil production.
2Quantity of substance
If conventional oil extraction methods are used to separate oil from cellular components, then oil recovery is achieved, but energy consumption and costs increase significantly
Solution Approach 1:
The patent extracts the problematic cellular structures (lipid droplets with Seipin-mediated organization) that make conventional extraction difficult. By removing Seipin function, the lipid droplets become less organized and more accessible, effectively taking out the structural barrier that requires high-energy extraction methods. This enables simpler, lower-energy extraction approaches while maintaining oil recovery efficiency.
3Quantity of substance
If Seipin gene is silenced to increase TAG production, then extractability improves, but this contradicts previous findings in yeasts and plants where Seipin loss reduced TAG accumulation
Solution Approach 1:
The patent applies local quality by recognizing that the Seipin protein's role differs between organism types. In microalgae (Stramenopiles), Seipin deficiency creates favorable conditions for TAG accumulation and extractability, whereas in yeasts and plants, Seipin has different functional contexts. This local adaptation to microalgal biology resolves the contradiction by applying species-specific understanding rather than universal assumptions.
Solution Approach 2:
The patent inverts the conventional wisdom established in yeast and plant research. Instead of following the pattern that Seipin overexpression increases TAGs (observed in yeasts/plants), the patent discovers and exploits the opposite effect in microalgae, where Seipin silencing enhances TAG production. This inversion of the established paradigm resolves the contradiction by revealing organism-specific regulatory differences.
Data Source
AI summary
The present invention relates to an engineered unicellular Stramenopile microalga comprising a loss of function of the homologous Seipin gene, an in vitro method of producing triacylglycerols (TAG), and uses thereof.