Clostridium difficile Detection Primer Sets for Strain Identification
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Solution Overview
Problem
Current methods for detecting Clostridium difficile strains face challenges due to gene variation, leading to potential false positives and the need for accurate, rapid detection of virulent strains, especially in hospital settings where contamination is a concern.
Innovation Solution
The use of specific primer sets targeting conserved genes like gluD, tcdA, tcdB, cdtA, cdtB, and tcdC, along with allele-specific primers and probes, for PCR-based detection, allowing for high sensitivity and specificity within a short timeframe.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If virulence genes (tcdA, tcdB, cdtA, cdtB) are used for molecular diagnosis, then detection specificity for virulent strains is improved, but false positive occurrence increases due to gene variation
Solution Approach 1:
The diagnosis is divided into two-stage detection: first detecting gluD gene presence to confirm C. difficile infection, then detecting virulence genes to identify specific strains. This segmentation allows the system to benefit from gluD's high conservation (reducing false positives) while still being able to detect virulence characteristics through the second stage.
Solution Approach 2:
The gluD gene serves as an intermediary marker that mediates between the need for general C. difficile detection and the need for virulence strain identification. By using gluD as a stable, conserved marker for initial detection, the system establishes a reliable baseline that reduces false positives before proceeding to virulence gene analysis.
2Reliability
If conserved genes like gluD are used for detection, then false positive rate is reduced, but detection speed for virulent strains decreases
Solution Approach 1:
The gluD gene detection is performed as a preliminary action to establish the presence of C. difficulte before proceeding to virulence gene analysis. This preliminary detection using the conserved gluD gene reduces false positives and confirms infection presence, then the system quickly proceeds to detect virulence genes in the same or subsequent testing to identify specific strains rapidly.
3Measurement precision
If multiple primer sets for different genes are used, then detection accuracy is improved, but kit complexity increases
Solution Approach 1:
The gluD primer set serves multiple functions: it detects general C. difficulte presence, confirms infection before virulence testing, and acts as a reference for subsequent virulence gene detection. This multi-functionality reduces the need for separate primer sets for each purpose, thereby reducing overall kit complexity while maintaining high detection accuracy.
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 accurate and rapid detection of Clostridium difficile strains, including virulent and hypervirulent forms, with reduced false positives and improved sensitivity, facilitating timely isolation and management.
Implementation Method 1
hybridizing a nucleic acid sequence obtained from the sample with at least one primer set selected from a primer set comprising at least 10 consecutive nucleotides selected from the nucleotide sequence of SEQ ID NO: 1 and at least 10 consecutive nucleotides selected from the nucleotide sequence of SEQ ID NO: 2
Implementation Method 2
amplifying a target nucleic acid sequence
Data Source
AI summary
A composition and kit for detecting Clostridium difficile including a primer set for detecting a strain of Clostridium difficile, and a method of detecting Clostridium difficile by using the same.