MZIR260 Corn Event Detection Using Unique Junction Sequences
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Solution Overview
Problem
Existing methods for detecting and distinguishing between different transgenic events in plants expressing Cry proteins are inadequate, particularly for high-quality events like MZIR260, due to reliance on interchangeable coding sequences and lack of specificity in current nucleic acid detection methods, which fail to discriminate between events with similar constructs.
Innovation Solution
The development of novel nucleic acid sequences, specifically the junction sequences unique to elite event MZIR260, allows for precise detection and identification of MZIR260 through the use of polynucleotide primers and probes, enabling accurate discrimination and confirmation of the event's presence or absence in samples.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional nucleic acid detection methods are used to detect transgenic events, then detection can be performed, but the methods lack specificity and fail to discriminate between events with similar constructs
Solution Approach 1:
The invention segments the detection approach by using event-specific junction sequences that uniquely identify each transgenic event. Instead of using generic detection methods that cannot distinguish between events, the patent divides the detection strategy into event-specific segments with unique primers and probes targeting the specific genomic integration sites of each transgenic event, thereby achieving high discrimination capability.
Solution Approach 2:
The invention applies local quality by focusing detection on the unique junction sequences at the integration sites of transgenic events rather than using universal detection methods. By designing primers and probes that target specific local regions (the junction sequences unique to each event), the method achieves high specificity for discriminating between different transgenic events with similar constructs.
2Ease of manufacture
If interchangeable coding sequences are used in transgenic constructs, then manufacturing is simplified, but detection and distinction between different events becomes inadequate
Solution Approach 1:
The invention introduces an intermediary element - the event-specific junction sequence - that serves as a unique identifier for each transgenic event. While the coding sequences remain interchangeable and standardized for ease of manufacture, the junction sequences formed during genomic integration act as intermediaries that provide the necessary specificity for detection and discrimination between different events.
3Reliability
If high-quality transgenic events are selected for commercial purposes, then reliable transgene expression is achieved, but detection methods must be highly specific to confirm event identity
Solution Approach 1:
The invention applies preliminary action by pre-characterizing the junction sequences of high-quality transgenic events during the event selection process. This preliminary identification and documentation of unique junction sequences enables the development of specific detection methods before commercial deployment, simplifying the confirmation of event identity in regulatory compliance and breeding programs.
Data Source
AI summary
A novel transgenic corn elite event designated MZIR260 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 elite event MZIR260. The invention further relates to assays for detecting the presence of the DNA sequences of corn elite event MZIR260, to corn plants and corn seeds comprising the genotype thereof, and to methods for producing a corn plant by crossing a corn plant comprising the elite event MZIR260 genotype with itself or another corn variety.