STEC Detection via Multiplex PCR Virulence Factor Targeting
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Solution Overview
Problem
Current methods for detecting Shiga toxin-producing E. coli (STEC) and other pathogenic microorganisms in food samples are not rapid or sensitive enough, leading to a need for novel assays that can differentiate between pathogenic and non-pathogenic organisms to ensure food safety.
Innovation Solution
The development of nucleic acid-based compositions and methods using specific primers and probes that target virulence factors such as shiga toxin and eae genes, allowing for the detection and identification of STEC organisms, including E. coli serotypes like O157:H7, O26, O45, O103, O111, O121, and O145, through PCR-based techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional detection methods are used for STEC microorganisms, then detection can be performed, but the detection is not rapid or sensitive enough
Solution Approach 1:
The detection method is divided into multiple sequential steps: enrichment of sample, extraction of nucleic acids, PCR amplification with specific primers targeting virulence factors (stx1, stx2, eae genes), and detection of amplified products. This segmentation allows each step to be optimized independently, achieving both high sensitivity through targeted amplification and reasonable throughput
Solution Approach 2:
The method performs preliminary enrichment of the sample before detection, concentrating potential STEC microorganisms and their nucleic acids. This preliminary action enhances detection sensitivity by increasing the target concentration, allowing rapid and specific detection even in complex food matrices with low pathogen loads
2Adaptability or versatility
If detection methods target multiple STEC serotypes, then comprehensive pathogen detection is achieved, but differentiation between pathogenic and non-pathogenic organisms becomes more complex
Solution Approach 1:
The PCR assay uses universal primers that target conserved regions of virulence factor genes (stx1, stx2, eae) present across multiple STEC serotypes including O157:H7, O26, O45, O103, O111, O121, and O145. This multi-functional primer design enables simultaneous detection of diverse pathogenic strains while maintaining assay simplicity through a single multiplex reaction
Solution Approach 2:
The method amplifies specific DNA sequences (copies of virulence factor genes) from the target microorganisms using PCR. By copying and multiplying the target DNA sequences, the method achieves high sensitivity for detecting multiple serotypes while keeping the detection system relatively simple, as the complexity is shifted to the in silico primer design rather than physical assay components
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 and specific detection of STEC microorganisms in various samples, including food and environmental samples, improving food safety by identifying potential pathogens and excluding non-pathogenic organisms, thereby reducing the risk of foodborne illnesses.
Implementation Method 1
compositions comprising isolated nucleic acid sequences that are operable to hybridize to nucleic acid regions
Implementation Method 2
PCR-based techniques
Data Source
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AI summary
The present teachings describe compositions, methods and kits for detection of one or multiple microorganism contaminants in samples. Some embodiments relate to detecting one or more microorganisms producing virulence factors such as a shiga toxin (stx) or an eae. In some embodiments, compositions, methods and kits can detect and identify individual strains and serotypes of shiga toxin producing microorganisms. Some embodiments describe compositions, methods and kits for detecting STEC microbes. Workflows for multiple microbe detection and identification are also described.