Multiplex qRT-PCR Assay for RSV Genotype and Viral Load
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Solution Overview
Problem
Current methods lack efficiency in determining the genotype and viral load of respiratory syncytial virus (RSV) in biological samples, which is crucial for effective treatment and vaccine development, as existing technologies are inadequate for accurately quantifying RSV subtypes A and B and assessing treatment efficacy.
Innovation Solution
The use of quantitative multiplex reverse transcriptase polymerase chain reaction (qRT-PCR) assays with differentially labeled probes specific to RSV subtypes A and B, allowing for simultaneous amplification and detection of viral load and genotype in a single reaction, utilizing universal primers and subtype-specific probes to distinguish between RSV A and B strains.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate PCR assays are used for genotyping and viral load determination, then each parameter can be determined with high precision, but the overall process efficiency is reduced and time consumption increases
Solution Approach 1:
The patent combines genotyping and viral load determination into a single multiplex qRT-PCR assay. Multiple subtype-specific probes (针对不同亚型的探针) are used simultaneously in one reaction to detect different RSV subtypes, while universal primers amplify a common target region. This allows parallel determination of both genotype and viral load in a single test, eliminating the need for separate assays and significantly improving throughput while maintaining measurement precision.
2Measurement precision
If multiple separate assays are performed for different RSV subtypes, then accurate subtype differentiation is achieved, but the complexity of the testing protocol increases
Solution Approach 1:
The patent employs universal primers that can amplify target sequences from all RSV subtypes (A and B), making the assay universally applicable to different viral strains. Meanwhile, subtype-specific probes with different fluorescent labels differentiate between subtypes. This multi-functional design allows a single assay protocol to handle all RSV subtypes, eliminating the need for multiple separate tests and reducing protocol complexity while maintaining accurate subtype differentiation.
3Ease of operation
If conventional PCR methods are used for RSV detection, then the methodology is simple and widely accessible, but the sensitivity and specificity for low viral loads are insufficient
Solution Approach 1:
The patent replaces conventional end-point PCR detection with real-time quantitative PCR (qRT-PCR) that uses fluorescent probes for continuous monitoring during amplification. The probes emit fluorescent signals proportional to the amount of amplified product, enabling precise quantification of viral load even at low concentrations. This substitution maintains ease of operation through automated fluorescent detection while dramatically improving sensitivity and measurement precision for low viral loads compared to conventional PCR.
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 sensitive and specific determination of RSV viral load and genotype, facilitating accurate diagnosis, treatment assessment, and vaccine efficacy evaluation, thereby improving patient management and vaccine development.
Implementation Method 1
at least one probe specifically binds to an RSV subtype A nucleic acid sequence and at least one probe specifically binds to an RSV subtype B nucleic acid sequence
Implementation Method 2
amplifying a nucleic acid sequence encoding an RSV open reading frame (ORF) in a biological sample using a set of primers that specifically amplifies an RSV subtype A ORF and/or an RSV subtype B ORF in a quantitative polymerase chain reaction assay
Data Source
AI summary
Methods are provided for a sensitive and specific assay for the determination of viral load and genotyping of RSV in a biological sample. Compositions and kits for use in the methods also are provided, including optimized primers for the amplification of and detection of the RSV open reading frames from subtypes A and B, and probes for distinguishing between the subtypes. Also provided are methods for amplifying and sequencing an open reading from of an RSV F protein, and compositions and kits for use in the methods.