MON87429 Maize Event Detection for Multi-Herbicide Trait Stacking
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Solution Overview
Problem
Combining multiple herbicide tolerance traits in maize through traditional breeding methods is time-consuming and expensive, and the expression of transgenes in multi-gene transgenic events is influenced by genomic location and environmental factors, requiring rigorous characterization and testing.
Innovation Solution
Development of recombinant DNA molecules with four expression cassettes, each optimized for specific herbicide tolerance traits, and methods for detecting the presence of maize event MON87429 using DNA probes and primers, enabling efficient identification and propagation of a superior multi-gene transgenic event.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional breeding methods are used to combine multiple herbicide tolerance traits in maize, then the desired trait combination can be achieved, but the process is time-consuming and expensive
Solution Approach 1:
The patent combines multiple herbicide tolerance traits (glyphosate, dicamba, 2,4-D, glufosinate, and FOP herbicide tolerance) into a single transgenic event by integrating multiple expression cassettes into one DNA construct. This merging of traits at the molecular level eliminates the need for traditional multi-generation breeding to combine separate traits, directly resolving the time and cost inefficiencies of conventional breeding approaches.
Solution Approach 2:
The transgenic maize plant is designed to perform multiple functions simultaneously by expressing five different herbicide tolerance proteins within a single organism. This multi-functionality allows the plant to tolerate a broad spectrum of herbicides, providing versatile weed control options while avoiding the sequential breeding process required for traditional multi-trait development.
2Adaptability or versatility
If traditional breeding methods are used to combine multiple herbicide tolerance traits in maize, then the desired trait combination can be achieved, but the process is expensive
Solution Approach 1:
By merging multiple traits into a single transgenic event through molecular biology techniques, the patent eliminates the need for expensive multi-generation breeding programs, field trial repetitions, and genetic mapping studies that characterize traditional breeding. The direct integration of multiple expression cassettes into one DNA construct significantly reduces development costs.
3Device complexity
If multiple transgenes are inserted at a single locus in the genome, then the breeding process is simplified, but the expression of each transgene may be influenced by genomic location and environmental factors
Solution Approach 1:
The patent employs different expression cassettes with specialized promoters and regulatory elements for each transgene, tailored to ensure consistent expression under specific conditions. Each cassette is designed with local optimization for its particular herbicide tolerance trait, using appropriate promoters (e.g., CaMV 35S, ubiquitin promoters) and tissue-specific regulatory sequences to maintain reliable expression regardless of genomic insertion site.
Solution Approach 2:
The patent utilizes multiple expression cassettes with varying regulatory parameters including different promoters, 5' and 3' UTR sequences, and intron configurations. These parameter variations in the expression cassettes compensate for potential positional effects in the genome, ensuring consistent and reliable transgene expression across different insertion locations and environmental conditions.
4Adaptability or versatility
If multiple expression cassettes are combined in a single transgenic insertion, then herbicide tolerance versatility is improved, but the complexity of characterizing and testing the event increases
Solution Approach 1:
The patent divides the multi-trait expression system into separate, modular expression cassettes, each responsible for a specific herbicide tolerance trait. This segmentation allows for independent characterization and testing of each cassette's performance, simplifying the overall characterization process by enabling systematic evaluation of individual transgenes before integrating them into the final multi-trait event.
Data Source
AI summary
The invention provides recombinant DNA molecules that are unique to maize event MON87429 and transgenic maize plants, maize plant parts, maize seeds, maize cells, and agricultural products containing maize event MON87429 as well as methods of using and detecting maize event MON87429. Transgenic maize plants containing maize event MON87429 exhibit tolerance to inhibitors of acetyl CoA carboxylase (ACCase) in the aryloxyphenoxy propionate (FOP) group, synthetic auxins, inhibitors of glutamine synthetase, and inhibitors of 5-enolpyruvylshikimate-3-phosphate synthase (EPSPS).