Hemiselmis Delta 5 Desaturase Gene Transfer for Plant EPA Production
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Solution Overview
Problem
Current methods for producing long chain polyunsaturated fatty acids (LC-PUFAs) face challenges such as heterogeneous oil compositions, fluctuating yields due to weather and disease, high costs of large-scale fermentation, and low amounts in natural animal tissues, making it difficult to achieve beneficial levels of PUFAs like DHA, EPA, and ARA for health benefits.
Innovation Solution
The use of nucleic acids encoding delta 5 desaturases from Hemiselmis spp. to transform plants, enhancing the production of EPA and other PUFAs by introducing specific desaturase genes linked to heterologous promoters, allowing for altered fatty acid biosynthesis and increased levels of desired fatty acids in plant oils.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If natural sources (fish oil, marine organisms) are used for PUFA production, then PUFA content is achieved, but oil composition becomes heterogeneous and requires extensive purification
Solution Approach 1:
The invention changes the biological system parameters by introducing specific desaturase genes (delta-5, delta-6, delta-12, delta-15) from Hemiselmis spp. into plant hosts, fundamentally altering the fatty acid biosynthesis pathway to produce homogeneous PUFA-rich oils with controlled composition, eliminating the need for extensive purification
Solution Approach 2:
The invention copies the desirable desaturase enzyme genes from marine microalgae Hemiselmis spp. and transfers them into plant systems, creating a replicated production system that maintains the high PUFA content while achieving the homogeneity and scalability of plant-based oil production
2Quantity of substance
If large-scale fermentation of Mortierella is used for ARA production, then ARA content is increased, but production cost increases significantly
Solution Approach 1:
The invention replaces expensive large-scale fermentation processes with plant-based production systems that utilize sunlight, air, and water for growth, dramatically reducing production costs while maintaining high ARA and PUFA content in the oil
Solution Approach 2:
The invention makes plants serve multiple functions: they act as both the production host and the oil storage vessel, eliminating the need for separate fermentation facilities and reducing overall production infrastructure costs
3Quantity of substance
If conventional breeding is used to increase PUFA content in plants, then natural selection occurs, but time required and genetic stability are compromised
Solution Approach 1:
The invention performs preliminary action by directly introducing the desired desaturase genes into the plant genome through genetic transformation, bypassing the lengthy conventional breeding process and achieving immediate genetic modification with stable inheritance of high PUFA content
4Quantity of substance
If dietary supplementation with large amounts of ALA is used to overcome rate-limiting step, then EPA production is increased, but consumption quantity and health risks increase
Solution Approach 1:
The invention introduces desaturase enzymes as intermediary catalysts that directly convert LA and ALA to GLA and SDA, and subsequently to ARA and EPA, bypassing the rate-limiting delta-6 desaturation step and eliminating the need for excessive ALA consumption
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 plants with enhanced PUFA content, improving nutrition and health benefits by stabilizing and increasing the production of beneficial fatty acids like EPA, ARA, and DHA, overcoming the limitations of natural sources and existing production methods.
Implementation Method 1
a polypeptide capable of desaturating a fatty acid molecule at carbon 5
Data Source
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AI summary
The invention relates to methods and compositions concerning desaturase enzymes that modulate the number and location of double bonds in long chain poly-unsaturated fatty acids (LC-PUFA' s). In particular, the invention relates to methods and compositions for improving omega-3 fatty acid profiles in plant products and parts using exogenous desaturase enzymes and nucleic acids encoding for such enzymes. In particular embodiments, the exogenous desaturase enzymes utilized are Hemiselmis spp. delta 5 desaturases. Also provided are improved soybean oil compositions having EPA derived from plants carrying the genes of interest.