Multiplex Real-Time PCR for Respiratory Pathogen Detection
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Solution Overview
Problem
Current diagnostic methods for respiratory bacteria, such as Streptococcus pneumoniae, Haemophilus influenzae, Staphylococcus aureus, Moraxella catarrhalis, Neisseria meningitidis, and Klebsiella pneumoniae, are slow, insensitive, and prone to errors, particularly in culture-based methods and MALDI-TOF MS technology, necessitating the development of more efficient and specific detection techniques for timely identification and effective treatment.
Innovation Solution
The use of multiplex real-time PCR methods with specific primers and probes targeting genes like lytA, cpsA, sodC, nuc, fucK, copB, and gltA, along with an internal amplification control, to simultaneously detect multiple pathogens in a single assay, enhancing sensitivity, inclusivity, and specificity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If culture-based diagnostic methods are used, then pathogen identification can be performed, but the detection time is long (24-72 hours) and sensitivity is low (only 30% positive diagnosis)
Solution Approach 1:
The patent replaces culture-based mechanical growth methods with PCR-based nucleic acid amplification. The multiplex real-time PCR assay detects bacterial DNA directly from clinical samples, eliminating the need for prolonged cultural incubation. This substitution achieves detection within hours rather than days, while simultaneously improving sensitivity through amplification of target genetic sequences.
Solution Approach 2:
The patent segments the detection process into multiple independent PCR assays targeting different bacterial species (Streptococcus pneumoniae, Haemophilus influenzae, Staphylococcus aureus, Moraxella catarrhalis, Neisseria meningitidis, and Klebsiella pneumoniae). Each pathogen is detected through specific primer pairs targeting unique genetic markers, allowing simultaneous identification of multiple pathogens in a single sample through segmented analytical approaches.
2Speed
If MALDI-TOF MS technology is used, then pathogen identification speed is improved, but identification accuracy deteriorates due to misidentification errors between closely related species
Solution Approach 1:
The patent applies local quality by targeting species-specific genetic regions rather than using global protein profiles. Each primer pair is designed to bind to unique sequences within specific bacterial species (e.g., lytA for S. pneumoniae, sodC for N. meningitidis), providing localized genetic fingerprinting that distinguishes closely related species with high precision while maintaining rapid detection capability.
Solution Approach 2:
The patent replaces MALDI-TOF MS mass spectrometry with PCR-based nucleic acid amplification. This substitution uses genetic sequence information rather than protein mass profiles, enabling more accurate discrimination between closely related bacterial species that have similar mass spectra but distinct genetic markers.
3Adaptability or versatility
If multiple separate diagnostic tests are requested for different pathogens, then comprehensive pathogen screening is achieved, but the complexity of testing increases and time consumption accumulates
Solution Approach 1:
The patent merges multiple separate diagnostic tests into a single multiplex real-time PCR assay. Six different bacterial pathogens are detected simultaneously in one reaction tube using multiple primer pairs and fluorescent probes. This consolidation maintains comprehensive pathogen screening coverage while reducing testing complexity, sample handling steps, and overall detection time compared to performing six separate tests.
Solution Approach 2:
The patent creates a universal diagnostic platform that can detect multiple bacterial species with a single assay design. The multiplex PCR system uses a common reaction buffer, polymerase, and cycling conditions while incorporating pathogen-specific primer pairs, making the system universally applicable for respiratory pathogen screening without requiring separate optimized protocols for each organism.
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 allows for rapid, accurate, and simultaneous detection of multiple respiratory pathogens, reducing false negatives and improving clinical utility by providing quick and reliable results, thereby aiding in effective antimicrobial stewardship and disease control.
Implementation Method 1
contacting the sample with a plurality of pairs of primers, wherein the plurality of pairs of primers comprises: at least one pair of primers capable of hybridizing to the lytA gene of S. pneumoniae
Implementation Method 2
generating amplicons of the lytA gene sequence of S. pneumoniae, amplicons of the cpsA gene sequence of S. pneumoniae, amplicons of the sodC gene sequence of N. meningitidis
Data Source
AI summary
Methods and compositions for detection of common bacterial pathogens causing respiratory infections are disclosed herein. In some embodiments, the presence or absence of Streptococcus pneumoniae, Haemophilus influenzae, Staphylococcus aureus, Moraxella (Branhamella) catarrhalis, Neisseria meningitides, and/or Klebsiella pneumoniae in a sample is determined using multiplex nucleic acid-based testing methods.