Modified Algae ATG8 Suppression Nitrogen-Sufficient Biomass
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Solution Overview
Problem
Current methods for algal biomass production, such as using cell-wall-deficient Chlamydomonas mutants, require nitrogen-deficient conditions for biomass induction, complicating the process and reducing productivity and efficiency.
Innovation Solution
The development of a modified alga with suppressed ATG8 expression and increased chloroplastic glutathione concentration, achieved through genetic modification involving the introduction of specific polynucleotides encoding MEX1 and silencing of the ATG8 gene, allowing for enhanced photosynthetic productivity without the need for nitrogen-deficient conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If nitrogen-deficient conditions are applied to induce biomass production in algae, then biomass productivity is improved, but the process complexity and operational difficulty increase
Solution Approach 1:
The invention changes the physiological state of the algal cells by suppressing ATG8 expression, which alters the metabolic parameters to enable biomass accumulation under nitrogen-sufficient conditions. This parameter change in gene expression allows the system to achieve high productivity without the operational complexity of nitrogen-deficient medium replacement
Solution Approach 2:
The invention performs preliminary genetic modification by suppressing ATG8 expression before biomass induction is needed. This preliminary action creates a modified algal strain that inherently accumulates biomass under normal nitrogen conditions, eliminating the need for subsequent nitrogen-deficient treatment steps
2Productivity
If nitrogen-deficient medium replacement is performed to induce biomass accumulation, then biomass productivity is improved, but the time consumption and process steps increase
Solution Approach 1:
The invention performs preliminary genetic modification by suppressing ATG8 expression, which pre-configures the algal cells to accumulate biomass under nitrogen-sufficient conditions. This eliminates the time-consuming medium replacement steps required in conventional methods
Solution Approach 2:
The invention enables continuous biomass production under nitrogen-sufficient conditions without interrupting the culture process for medium replacement. The modified algae maintain continuous photosynthetic activity and biomass accumulation, avoiding the downtime associated with nutrient restriction protocols
3Ease of manufacture
If cell wall-deficient mutants are used to facilitate biomass recovery, then ease of cell disruption is improved, but the requirement for nitrogen-deficient conditions worsens process complexity
Solution Approach 1:
The invention changes the gene expression parameter (suppressing ATG8) to achieve biomass accumulation under nitrogen-sufficient conditions, combining this with cell wall-deficient mutations to maintain ease of cell disruption while eliminating the need for complex nitrogen-deficient protocols
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach results in increased intracellular photosynthetic productivity, reducing costs and enhancing biomass production efficiency, enabling photosynthate accumulation and recovery without nutrient restriction, and facilitating easier starch purification.
Implementation Method 1
Biomass, a raw material for biofuel, includes saccharides (for example, starch) and oils and fats, and is produced by plants through photosynthesis
Data Source
AI summary
The present invention provides a method of biomass production using a modified alga having suppressed expression of ATG8.