Soybean Oleic Acid via GmFAD2-2 Mutagenesis
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Solution Overview
Problem
The soybean industry faces challenges in increasing soybean seed oleic acid content while maintaining good yield, as high oleic acid levels derived from mutations in the GmFAD2-1 genes may reduce seed germination in cold soil.
Innovation Solution
The use of EMS mutagenesis and TILLING by sequencing+ to functionally characterize the five members of the GmFAD2-2 subfamily in soybeans, which can help increase seed oleic acid content without affecting seed germination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If mutations in the GmFAD2-1 genes are used to increase oleic acid content, then oleic acid content is improved, but seed germination in cold soil deteriorates
Solution Approach 1:
The patent changes the genetic parameter from GmFAD2-1 to GmFAD2-2 subfamily genes, which have different functional characteristics. By targeting alternative genes (GmFAD2-2A, GmFAD2-2B, GmFAD2-2C, GmFAD2-2D, GmFAD2-2E) with mutations or RNAi suppression, the patent achieves high oleic acid content while maintaining seed germination capability, thus resolving the contradiction through parameter substitution.
2Quantity of substance
If traditional breeding methods are used to increase oleic acid content, then oleic acid content is improved, but breeding time increases
Solution Approach 1:
The patent replaces traditional mechanical breeding methods (crossing, selection, and hybridization) with molecular biology techniques including gene mutation, RNA interference (RNAi), and CRISPR/Cas9 genome editing. This substitution enables precise modification of fatty acid desaturase genes to achieve high oleic acid content in a controlled manner, significantly reducing the time required compared to conventional breeding.
3Stability of the object's composition
If high polyunsaturated fatty acid content is maintained, then natural fatty acid composition is preserved, but oxidative stability deteriorates
Solution Approach 1:
The patent converts the harmful effect of polyunsaturated fatty acids (low oxidative stability) into a benefit by suppressing their synthesis through genetic modification. By downregulating FAD2 genes that convert oleic acid to linoleic acid, the patent reduces polyunsaturated fatty acid content and simultaneously improves oxidative stability, shelf life, and cold flow properties of the soybean oil.
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 allows for the identification of soybean lines with increased oleic acid content, improving oxidative stability and shelf life of soybean oil, while maintaining seed germination and yield.
Implementation Method 1
Using ethyl-methanesulfonate (EMS) mutagenesis effects on DNA, significant changes to the genes and gene network underlying the oil profile in soybean can be achieved.
Implementation Method 2
The fatty acid desaturase-2 enzyme (FAD2) is responsible for the conversion of oleic acid to linoleic acid in the developing soybean seeds by introducing a double bond at the Δ12 position of oleic acid.
Data Source
AI summary
The present invention is directed to a transgenic soybean plant with increased oleic acid content comprising a polynucleotide encoding a fatty acid desaturase (FAD) related promoter that functions in the soybean plant operably linked to a polynucleotide encoding a polypeptide having FAD activity. The invention is also related to a plant of an agronomically elite soybean variety with increased oleic acid content comprising a polynucleotide encoding a fatty acid desaturase (FAD) related promoter that functions in the soybean plant operably linked to a polynucleotide encoding a polypeptide having FAD activity. The invention is still further directed to a method of increasing the oleic acid content of a soybean plant comprising transforming the soybean plant with a polynucleotide encoding a fatty acid desaturase (FAD) related promoter that functions in the soybean plant operably linked to a polynucleotide encoding a polypeptide having FAD activity.