Multiplex PCR Assay for MRSA Detection via nuc and mecA Targets
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Solution Overview
Problem
Current methods fail to rapidly and accurately detect and differentiate between methicillin-resistant Staphylococcus aureus (MRSA) and methicillin-sensitive Staphylococcus aureus from clinical samples, as well as distinguish Staphylococcus aureus from coagulase-negative Staphylococci, due to the widespread distribution of the mecA gene among both species.
Innovation Solution
The use of specific primers and probes that anneal to S. aureus-specific sequences and polymorphic MREJ nucleic acids, allowing for simultaneous detection of S. aureus and MRSA in a single assay by targeting the nuc gene and the mecA gene insertion site, respectively, under stringent conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional detection methods are used to identify S. aureus and MRSA, then the detection process requires multiple separate assays, but this increases the time required for diagnosis and reduces efficiency
Solution Approach 1:
The patent combines multiple detection functions into a single multiplex PCR assay that simultaneously detects S. aureus (via nuc gene), MRSA (via mecA gene), and differentiates between S. aureus and coagulase-negative staphylococci. This merging of multiple assays into one reduces both the time required and the number of separate procedures needed for comprehensive staphylococcal identification and methicillin resistance detection.
2Measurement precision
If the mecA gene is used as a marker for MRSA detection, then MRSA can be identified, but the widespread distribution of mecA among both S. aureus and coagulase-negative Staphylococci reduces measurement precision
Solution Approach 1:
The patent segments the detection process into distinct molecular targets: using nuc gene-specific primers to identify S. aureus, mecA gene-specific primers to identify MRSA, and coagulase gene-specific primers to differentiate S. aureus from coagulase-negative staphylococci. This segmentation allows each assay component to target specific genetic markers, enabling precise differentiation despite the widespread distribution of individual genes like mecA across different staphylococcal species.
3Measurement precision
If multiple separate assays are performed to detect S. aureus, MRSA, and differentiate species, then each target can be detected specifically, but this increases device complexity and operational difficulty
Solution Approach 1:
The patent creates a universal multiplex PCR system that performs multiple detection functions simultaneously: detecting S. aureus presence via nuc gene amplification, identifying MRSA through mecA gene amplification, and differentiating S. aureus from coagulase-negative staphylococci using coagulase gene amplification. This single multi-functional assay reduces device and procedural complexity while maintaining high detection specificity for each target through the use of species-specific primers and probes.
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
This approach enables rapid and specific identification of S. aureus and MRSA, overcoming the limitations of previous methods by providing a single assay that can distinguish between these strains and coagulase-negative Staphylococci, improving diagnostic accuracy and efficiency.
Implementation Method 1
The use of specific primers and probes that anneal to S. aureus-specific sequences and polymorphic MREJ nucleic acids, allowing for simultaneous detection of S. aureus and MRSA in a single assay by targeting the nuc gene and the mecA gene insertion site, respectively, under stringent conditions.
Data Source
AI summary
Aspects of the present invention relate to methods and compositions for the detection and/or quantification of S. aureus from a sample, as well as methods and compositions useful for the detection and/or quantification of S. aureus and MRSA in a single assay. Embodiments include nucleic acids that hybridize to S. aureus-specific nuc sequences and MREJ sequences.