DAS-59122-7 Flanking Sequence Detection for Transgenic Corn
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Solution Overview
Problem
Current methods for detecting specific transgenic events in crops, such as corn, are not discriminative enough, particularly when using DNA constructs that are similar, making it difficult to identify and differentiate between different events, which is crucial for regulatory compliance, environmental monitoring, and ensuring consistent transgene expression.
Innovation Solution
A DNA construct, PHI17662A, is introduced into corn plants, comprising three transgene expression cassettes with specific promoters and terminators, and methods using primer sequences and probes that recognize unique flanking sequences of the corn plant DAS-59122-7 to specifically identify and detect the presence of this event in samples.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional detection methods are used for transgenic events, then detection can be performed, but discrimination between similar events is insufficient
Solution Approach 1:
The detection method is segmented into multiple components: (1) amplification of a first portion of the flanking region using event-specific primers, (2) amplification of a second portion using additional primers, and (3) sequencing to identify the complete flanking region. This segmentation allows systematic analysis of complex genomic regions to achieve precise event discrimination.
Solution Approach 2:
The invention extends detection from simply identifying the presence of a transgene to characterizing the complete flanking region sequence. By adding the dimension of sequence analysis beyond basic detection, the method can distinguish between events with identical transgenes but different integration sites, thereby improving discrimination capability.
2Reliability
If hundreds to thousands of events are produced to find optimal expression, then desired transgene expression levels can be achieved, but screening time and resources increase
Solution Approach 1:
The complete flanking region sequence is determined early in the event characterization process, before large-scale screening. This preliminary action creates a unique molecular fingerprint for each event that can be used for rapid identification and tracking throughout subsequent screening and deployment, reducing the time required for event management.
Solution Approach 2:
The sequencing-based detection method provides precise feedback on event identity and integration characteristics. This feedback enables researchers to quickly identify events with desired expression patterns and make informed decisions about which events to advance, thereby reducing the overall screening time while maintaining reliability.
3Measurement precision
If event-specific detection methods are developed, then precise identification of specific events is enabled, but complexity of detection system increases
Solution Approach 1:
The flanking region sequencing approach serves multiple functions: (1) it provides event-specific identification, (2) it characterizes integration site, (3) it verifies insertion orientation, and (4) it enables differentiation between events with identical transgenes. This multi-functionality reduces the need for separate detection systems for each purpose, thereby managing complexity while enhancing precision.
Data Source
AI summary
The invention provides DNA compositions that relate to transgenic insect resistant maize plants. Also provided are assays for detecting the presence of the maize DAS-59122-7 event based on the DNA sequence of the recombinant construct inserted into the maize genome and the DNA sequences flanking the insertion site. Kits and conditions useful in conducting the assays are provided.