Wheat Lpx1 Gene Mutations for Flour Stability
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Solution Overview
Problem
Current wheat varieties face challenges in maintaining oxidative stability, leading to rapid hydrolytic and oxidative rancidity in whole grain flour, which affects shelf life and consumer acceptance.
Innovation Solution
Non-transgenic mutations in the Lpx1 genes, specifically in the B and D genomes of wheat, are introduced to reduce lipoxygenase activity, thereby enhancing the oxidative stability of wheat flour.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If lipoxygenase activity is maintained in wheat plants, then normal metabolic functions are preserved, but oxidative stability of wheat flour deteriorates rapidly leading to rancidity
Solution Approach 1:
The patent applies the 'Taking out' principle by removing or inactivating the lipoxygenase enzyme through targeted mutations in the Lpx1 gene. This extraction of the harmful enzymatic function eliminates the source of oxidative degradation while preserving the rest of the wheat plant's metabolic functions. The mutation specifically targets and removes the problematic lipoxygenase activity that causes rancidity.
Solution Approach 2:
The patent employs 'Parameter changes' by altering the genetic parameters of the Lpx1 gene through mutations. These genetic modifications change the enzyme's activity level from normal to reduced or inactive, thereby changing the oxidative stability parameter of the wheat flour from poor to improved. The mutation modifies the fundamental parameters of the lipoxygenase system to achieve desired stability.
2Quantity of substance
If whole grain flour is produced to provide health benefits, then nutritional value increases, but shelf life decreases due to rapid oxidative degradation
Solution Approach 1:
The patent applies 'Blessing in disguise' by converting the naturally high lipoxygenase activity, which causes harmful oxidative degradation, into a beneficial trait. Through selective breeding or genetic modification, the reduced lipoxygenase activity is achieved, transforming the original harmful oxidative process into a beneficial stability characteristic that extends shelf life while maintaining nutritional value.
3Ease of manufacture
If conventional wheat varieties are used, then production is straightforward, but consumer acceptance decreases due to bitter and off flavors
Solution Approach 1:
The patent uses 'Parameter changes' by modifying the lipoxygenase activity parameter in wheat plants through genetic mutations. This parameter change eliminates the formation of bitter and off-flavor compounds during storage, thereby improving sensory characteristics and consumer acceptance while maintaining production feasibility.
Data Source
AI summary
A series of independent human-induced non-transgenic mutations found at one or more of the Lpx genes of wheat; wheat plants having these mutations in one or more of their Lpx genes; and a method of creating and finding similar and/or additional mutations of Lpx by screening pooled and/or individual wheat plants. The wheat plants disclosed herein exhibit decreased lipoxygenase activity without having the inclusion of foreign nucleic acids in their genomes. Additionally, products produced from the wheat plants disclosed herein display increased oxidative stability and increased shelf life without having the inclusion of foreign nucleic acids in their genomes.