Transgenic Soybean Chromosomes with Cleavage-Resistant RNA Duplexes
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Solution Overview
Problem
Current soybean breeding techniques fail to effectively enhance agronomic traits such as increased pods per node, internodes, and nodes, and decreased internode length, while also maintaining a twisted stem phenotype, due to limitations in regulating microRNA171 (miR171) activity.
Innovation Solution
Introduction of a non-natural transgenic chromosome in soybean plants with a recombinant DNA construct that transcribes an RNA molecule capable of forming a cleavage-resistant duplex with miR171 miRNA, thereby inhibiting its function and enhancing desired agronomic characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional soybean breeding techniques are used, then existing agronomic traits are maintained, but enhancement of pods per node, internodes, nodes, and twisted stem phenotype cannot be achieved
Solution Approach 1:
The invention changes the functional state of miR171 from active to inhibited by introducing a transgenic chromosome with an RNA molecule that forms a cleavage-resistant duplex with miR171. This parameter change in miR171 activity directly enables the enhancement of agronomic traits such as increased pods per node, increased number of internodes and nodes, decreased average internode length, and twisted stem phenotype that cannot be achieved with conventional breeding techniques
2Productivity
If miR171 activity is inhibited, then desired agronomic characteristics are enhanced, but the complexity of genetic modification is increased
Solution Approach 1:
The invention uses an RNA molecule as an intermediary substance that mediates the inhibition of miR171 function. This RNA molecule forms a cleavage-resistant duplex with miR171, effectively blocking its activity without requiring direct manipulation or destruction of the miR171 gene itself, thereby simplifying the genetic modification approach while still achieving the desired agronomic enhancement
Solution Approach 2:
The invention extracts the inhibitory function from complex genetic manipulation by using a standalone RNA molecule that can be introduced into soybean cells. This extracted RNA molecule specifically targets and inhibits miR171 activity, separating the inhibitory function from the need for complex chromosomal modifications or multiple gene edits, thus reducing overall modification complexity
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
The approach results in soybean plants with increased pods per node, internodes, and nodes, and decreased internode length, along with a twisted stem phenotype, by effectively regulating miR171 activity and improving agronomic traits.
Implementation Method 1
an RNA molecule that hybridizes under physiological conditions to and forms a cleavage-resistant duplex with a mature miR171 miRNA
Data Source
AI summary
Described herein are transgenic soybean chromosomes containing a recombinant DNA that transcribes to an RNA molecule that hybridizes to and forms a cleavage-resistant duplex with either a mature miR171 miRNA or a transcript of a target gene having a recognition site for a mature miR171 miRNA whereby the function of the miR171 miRNA is inhibited and thereby imparts enhanced agronomic traits to soybean plants such as increased pods per node, increased number of nodes, a decreased distance between nodes, and a twisted stem.