Multiplex PCR Cross-Contamination Detection with GFP Reporter
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Solution Overview
Problem
Current methods for detecting foodborne pathogens like Salmonella, Listeria, and E. coli are time-consuming and prone to false positives due to cross-contamination, requiring lengthy cultural confirmation and fluorescence detection under UV light, which can delay results and lead to product holds and potential financial losses.
Innovation Solution
A method involving a test sample and a control sample with a reporter molecule, such as Green Fluorescent Protein (GFP), where both are lysed and subjected to PCR with specific primer sets, allowing simultaneous detection of pathogens and control strains, thereby identifying cross-contamination in real-time without additional materials or delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional cultural confirmation and fluorescence detection methods are used, then pathogen detection accuracy is improved, but detection time increases significantly causing delays
Solution Approach 1:
The patent combines PCR amplification with fluorescence detection in a single multiplex reaction system. The control strain engineered with GFP reporter gene allows simultaneous detection of target pathogens and cross-contamination controls through shared reagents and unified amplification conditions, eliminating sequential processing steps while maintaining detection accuracy
Solution Approach 2:
The control strain is pre-engineered with the GFP reporter gene and integrated into the testing system before use. This preliminary preparation enables the control mechanism to function automatically during the main detection process without requiring separate setup or additional time for control validation
2Reliability
If separate detection methods for pathogens and cross-contamination controls are used, then detection thoroughness is improved, but operational complexity and cost increase
Solution Approach 1:
The multiplex PCR system uses universal reagents and a single reaction protocol that simultaneously detects multiple targets: target pathogens and control strains. The shared amplification system and unified detection methodology reduce operational steps, eliminate the need for separate processing workflows, and maintain comprehensive detection capability
Solution Approach 2:
The GFP-engineered control strain acts as an intermediary element that monitors cross-contamination within the same reaction system. This internal control mechanism provides continuous validation without interfering with target pathogen detection, enabling simultaneous monitoring of both primary and secondary contamination risks
3Measurement precision
If control strains are detected separately after pathogen detection, then cross-contamination verification is improved, but productivity decreases due to sequential processing
Solution Approach 1:
The multiplex PCR system maintains continuous amplification for all targets simultaneously throughout the entire reaction process. Both target pathogens and control strains are amplified and detected in the same time frame without interruption or sequential waiting, maximizing instrument utilization and testing throughput while ensuring cross-contamination verification
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
Enables rapid, accurate detection of pathogens and immediate identification of cross-contamination, reducing the risk of false positives and product delays, ensuring timely shipment and minimizing financial losses.
Implementation Method 1
a control bacterial strain engineered with a reporter molecule... such as Green Fluorescent Protein (GFP)... fluorescence detection under UV light
Implementation Method 2
subjected to PCR with specific primer sets, allowing simultaneous detection of pathogens and control strains
Data Source
AI summary
The present disclosure is directed to a method for simultaneously detecting presence or absence of a target bacteria and a reporter labeled protein in a sample to determine the occurrence of cross-contamination, and kits and composition for carrying out such methods.