Soybean Event Detection Using Flanking Sequence Primers
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Solution Overview
Problem
Current methods for detecting transgenic soybean events, such as Soybean Event pDAB9582.814.19.1, are not discriminative enough, particularly when using DNA constructs that are similar, making it difficult to identify specific events like pDAB9582.814.19.1, which is essential for regulatory compliance, breeding, and ensuring consistent transgene expression.
Innovation Solution
A method involving specific primers that bind to unique flanking sequences surrounding the insertion site of the transgene in the soybean genome, allowing for the detection of Soybean Event pDAB9582.814.19.1 through PCR analysis, using sequences like those described in SEQ ID NO:1 and SEQ ID NO:2, to generate event-specific amplicons that are diagnostic for the event.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If general transgene detection methods (promoter, terminator, marker gene detection) are used, then detection capability is provided, but discrimination between different events is insufficient
Solution Approach 1:
The detection method is segmented into two distinct parts: (1) detection of common transgene elements (promoter, terminator, marker gene) using general primers, and (2) detection of event-specific flanking sequences using specialized primers. This segmentation allows the method to maintain broad compatibility while achieving event-specific discrimination, resolving the contradiction between detection capability and discrimination precision.
Solution Approach 2:
The invention applies local quality by designing detection primers that target specific local regions (flanking sequences) adjacent to the transgene insertion site. These flanking sequences have unique characteristics for each event, allowing precise discrimination. The method focuses detection effort on these distinctive local regions rather than attempting to differentiate across the entire transgene construct.
2Measurement precision
If event-specific detection is implemented, then discrimination between similar constructs is improved, but detection method complexity increases
Solution Approach 1:
The flanking sequences serve as intermediaries between the transgene insert and the native genome. These sequences contain unique molecular signatures for each integration event and act as mediators that enable event-specific detection without requiring direct analysis of the transgene coding regions. The detection primers target these intermediary flanking regions, simplifying the overall detection approach while maintaining event-specificity.
3Reliability
If multiple events are screened to find optimal expression, then desired transgene expression levels are achieved, but time and resource consumption increase
Solution Approach 1:
The invention enables preliminary identification and characterization of transformation events through event-specific detection. By using flanking sequence analysis, researchers can early in the screening process identify events with desired expression characteristics without having to screen through numerous generations or perform extensive phenotypic analysis. This preliminary molecular characterization accelerates the selection of optimal events for further development.
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 enables precise identification of Soybean Event pDAB9582.814.19.1, facilitating regulatory compliance, breeding, and ensuring consistent transgene expression by distinguishing the event from other similar constructs, thereby supporting reliable gene expression and commercial use.
Implementation Method 1
contacting said sample with a first primer at least 10 bp in length that selectively binds to a flanking sequence within bp 1-1400 of SEQ ID NO:1 or the complement thereof, and a second primer at least 10 bp in length that selectively binds to an insert sequence within bp 1401-1836 of SEQ ID NO:1 or the complement thereof
Implementation Method 2
assaying for an amplicon generated between said primers; or contacting said sample with a first primer at least 10 bp in length that selectively binds to an insert sequence within bp 1-152 of SEQ ID NO:2 or the complement thereof, and a second primer at least 10 bp in length that selectively binds to flanking sequence within bp 153-1550 of SEQ ID NO:2 or the complement thereof; and assaying for an amplicon generated between said primers
Data Source
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AI summary
Soybean Event pDAB9582.814.19.1 comprises genes encoding Cry1F, Cry1Ac (synpro), and PAT, affording insect resistance and herbicide tolerance to soybean crops containing the event, and enabling methods for crop protection and protection of stored products. The invention provides PCR event detection methods.