Transgenic Corn Event 5307 Detection with Flanking DNA
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Solution Overview
Problem
Existing methods for detecting transgenic corn events, such as those resistant to corn rootworm, are inadequate for discriminating between different events, particularly when they share the same DNA construct, and there is a need for reliable detection methods to ensure consistent transgene expression and compliance with regulatory requirements.
Innovation Solution
A novel transgenic corn event (5307) incorporating a FR8a gene for insect resistance and a PMI gene for mannose utilization, along with unique nucleic acid sequences, is developed, allowing for the detection of specific event DNA through nucleic acid amplification and hybridization using specific primers and probes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional detection methods focusing on common genetic elements (promoters, terminators, marker genes) are used, then detection simplicity and uniformity are improved, but the ability to discriminate between different transgenic events is worsened
Solution Approach 1:
The patent divides the detection approach into two segments: (1) detection of common transgenic elements using universal primers for simplicity, and (2) detection of event-specific flanking DNA sequences using customized primers for discrimination. This segmentation allows each detection method to serve its specific purpose while working together in a comprehensive detection strategy.
Solution Approach 2:
The patent applies local quality by using different primer strategies for different detection needs: universal promoters/terminators/markers for general transgene detection, and event-specific flanking sequences for precise event identification. Each region of the transgenic construct is targeted with appropriate primers based on its function in detection.
2Reliability
If hundreds of different transgenic events are produced and screened to find one with desired expression levels, then reliable transgene expression is improved, but the time and resources required for screening are worsened
Solution Approach 1:
The patent performs preliminary characterization of transgenic events during the transformation process itself, identifying events with desired expression levels and patterns before commercial deployment. This preliminary action creates a screened, validated event that can be directly used without extensive additional screening, saving time in subsequent applications.
Solution Approach 2:
The patent implements feedback through characterization data from expression analysis and flanking sequence determination, which informs selection of events for further development. Events with optimal expression levels and stable integration patterns are selected based on this feedback, reducing the need for extensive additional screening.
3Measurement precision
If transgenic events are characterized by sequencing flanking DNA sequences, then event-specific detection capability is improved, but the complexity and cost of characterization are worsened
Solution Approach 1:
The patent extracts only the necessary flanking sequence information needed for event identification, rather than sequencing entire genomes or unnecessary regions. By focusing specifically on the DNA sequences immediately adjacent to the transgene insertion site, the methodology achieves event-specific detection with reduced complexity compared to comprehensive sequencing approaches.
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 method enables accurate detection of the 5307 event in biological samples, ensuring consistent transgene expression and compliance with regulatory standards, while providing insect resistance and mannose utilization capabilities.
Implementation Method 1
expression of foreign genes encoding insecticidal proteins in transgenic plants
Implementation Method 2
a PMI gene, encoding a phosphomannose isomerase enzyme (PMI)... useful as a selectable marker, which allows the plant to utilize mannose as a carbon source
Implementation Method 3
detect the presence of a transgene by any well-known nucleic acid detection method including but not limited to thermal amplification (polymerase chain reaction (PCR))
Implementation Method 4
DNA hybridization using nucleic acid probes
Data Source
AI summary
A novel transgenic corn event designated 5307, is disclosed. The invention relates to DNA sequences of the recombinant constructs inserted into the corn genome and of genomic sequences flanking the insertion site that resulted in the 5307 event. The invention further relates to assays for detecting the presence of the DNA sequences of event 5307, to corn plants and corn seeds comprising the genotype of and to methods for producing a corn plant by crossing a corn plant comprising the event 5307 genotype with itself or another corn variety.