Alfalfa Event KK179-2 Detection Using Junction-Specific Primers
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Solution Overview
Problem
Current methods for detecting transgenic alfalfa plants, such as those with reduced lignin content, are inefficient as they often rely on general genetic elements and do not effectively discriminate between different transformation events, requiring extensive screening and lacking event-specific detection capabilities.
Innovation Solution
Development of specific DNA molecules and detection methods targeting the transgene/genomic junction regions of alfalfa event KK179-2, including primers and probes, to accurately identify and detect the presence of the event in plant samples.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If general genetic elements are used for detection, then detection coverage is broad, but detection precision and event-specific discrimination are poor
Solution Approach 1:
The detection method is segmented into two distinct parts: a common primer that binds to conserved regions of the transgene, and an event-specific primer that binds to unique junction sequences. This segmentation allows the system to maintain broad detection capability while achieving event-specific precision, as each primer component serves a specialized function in the PCR amplification process.
Solution Approach 2:
The invention applies local quality by designing primers with different specificity characteristics at different regions of the target DNA. The common primer targets conserved transgene sequences for broad detection, while the event-specific primer targets unique junction regions for precise event identification. This localized differentiation of primer specificity enables simultaneous achievement of broad coverage and high precision.
2Reliability
If extensive screening of transformation events is performed, then event-specific traits are identified, but time and resource consumption increase
Solution Approach 1:
The invention performs preliminary action by developing and storing event-specific primer sequences based on known junction regions before actual detection is needed. This allows transformation events to be rapidly identified using pre-designed primers, eliminating the need for extensive de novo screening and significantly reducing detection time while maintaining high reliability.
Solution Approach 2:
The invention uses copying by creating specific DNA sequences (primers) that replicate and amplify only the target event-specific junction regions. This molecular copying approach enables rapid multiplication of detectable signals from minimal starting material, allowing reliable identification of events without extensive screening of large sample populations.
3Adaptability or versatility
If transgene insertion sites are characterized, then event-specific detection is enabled, but molecular analysis complexity increases
Solution Approach 1:
The invention achieves universality through the common primer component, which is designed to bind to conserved regions present across multiple transgene insertions. This single primer can be used in combination with different event-specific primers to detect various transformation events, making the detection system adaptable and versatile without requiring entirely separate methodologies for each event.
Solution Approach 2:
The invention uses the junction sequence as an intermediary element that connects the common transgene sequence to the event-specific genomic context. By targeting this intermediate region through specially designed primers, the system enables event-specific detection without requiring direct analysis of the entire transgene insertion site, thereby reducing molecular analysis complexity while maintaining adaptability.
Data Source
AI summary
The present invention provides a transgenic alfalfa event KK179-2. The invention also provides cells, plant parts, seeds, plants, commodity products related to the event, and DNA molecules that are unique to the event and were created by the insertion of transgenic DNA into the genome of a alfalfa plant. The current invention also provides anti-sense-oriented RNA gene suppression agents in the form of a loop of anti-sense-oriented RNA that is produced in the cells of transgenic alfalfa. In addition, the invention also provides methods for detecting the presence of said alfalfa event nucleotide sequences in a sample, probes and primers for use in detecting nucleotide sequences that are diagnostic for the presence of said alfalfa event.