Soybean Oil Oleic Acid Increase via FAD2-1A/1B Gene Knockout
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Solution Overview
Problem
Traditional methods for modifying soybean oil composition, such as hydrogenation, result in the formation of trans fats linked to cardiovascular disease, and transgenic approaches are not acceptable in certain regions, while traditional breeding and mutagenesis strategies for increasing oleic acid content reduce soybean yield.
Innovation Solution
The use of sequence-specific, rare-cutting endonucleases like TAL effector endonucleases to introduce mutations in the FAD2-1A and FAD2-1B genes, knocking out their function without inserting a transgene, thereby increasing oleic acid content and decreasing linoleic acid content in soybean oil.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If hydrogenation process is used to increase heat stability and improve shelf life, then oil stability is improved, but trans fats are formed which are harmful to health
Solution Approach 1:
The patent changes the chemical composition parameters of soybean oil by knocking out FAD2-1A/1B genes, thereby altering the fatty acid profile to increase oleic acid content and decrease linoleic acid content. This genetic modification approach changes the inherent properties of the oil to achieve stability without requiring chemical hydrogenation, thus avoiding trans fat formation
2Quantity of substance
If transgenic approaches are used to modify soybean oil composition, then oleic acid content can be increased, but the method is not acceptable in Europe and other regions
Solution Approach 1:
The patent extracts and removes the specific FAD2-1A/1B genes responsible for linoleic acid synthesis through targeted knockout. By taking out these specific genetic elements rather than introducing foreign transgenic material, the method achieves gene modification without transgenesis, making it acceptable in regions that reject transgenic organisms while still increasing oleic acid content
3Quantity of substance
If traditional breeding and mutagenesis strategies are used to increase oleic acid content, then oil composition is improved, but soybean yield is reduced
Solution Approach 1:
The patent applies local quality modification by specifically targeting and knocking out only the FAD2-1A/1B genes involved in linoleic acid synthesis, while leaving the rest of the genome and other important yield-related genes unchanged. This precise localized genetic modification allows improvement of oil composition without the widespread genetic changes associated with traditional breeding that would negatively impact yield
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 method effectively increases oleic acid content to over 30% and reduces linoleic acid content to less than 10% in soybean oil, improving oil stability and health benefits without the drawbacks of transgenic methods or yield reduction.
Implementation Method 1
The TAL effector endonuclease can bind to a sequence as set forth in any of SEQ ID NOS:18-33
Data Source
AI summary
Materials and methods are provided for making soybean varieties that have altered oil composition as a result of mutations in the FAD2-1A and FAD2-1B genes.