Dengue Virus Detection Assays Using Multiplex RT-PCR
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Solution Overview
Problem
Current diagnostic tests for dengue virus are suboptimal, with existing nucleic acid amplification tests being cumbersome, prone to contamination, and lacking sensitivity and specificity, particularly in secondary infections, which complicates rapid and accurate diagnosis and treatment.
Innovation Solution
Development of sensitive and reliable nucleic acid-based diagnostic assays using specific primers and probes for real-time RT-PCR and multiplex RT-PCR to detect and quantify dengue viruses, allowing for simultaneous detection of multiple serotypes in a single assay, including the use of molecular beacons for improved sensitivity and specificity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional hemi-nested RT-PCR assay is used, then detection sensitivity is maintained, but the number of steps and risk of contamination increases
Solution Approach 1:
The patent combines reverse transcription and PCR amplification into a single real-time reaction system, eliminating separate steps and reducing contamination risk while maintaining detection sensitivity through the use of sequence-specific probes that monitor amplification in real-time
2Measurement precision
If multiple separate reactions are used for serotyping, then detection accuracy is improved, but turnaround time increases
Solution Approach 1:
The patent designs a universal real-time RT-PCR platform that can detect and serotype all four dengue virus types in a single reaction system, using sequence-specific probes that differentiate serotypes through their distinct binding sequences, thereby achieving both accuracy and speed
Solution Approach 2:
The patent transitions from sequential one-dimensional testing to parallel multi-dimensional detection by simultaneously amplifying and differentiating multiple serotypes within a single reaction well, using fluorescent probes that emit distinct signals for each serotype
3Ease of operation
If existing nucleic acid amplification tests are used, then detection capability is provided, but sensitivity and specificity in secondary infections deteriorates
Solution Approach 1:
The patent employs sequence-specific probes designed to target unique regions of each dengue serotype genome, allowing the system to maintain high sensitivity and specificity by matching probe sequences to the local genetic characteristics of each serotype, even in secondary infection scenarios
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
The assays enable rapid, accurate detection and quantification of dengue virus serotypes, facilitating timely treatment and preventing further transmission, while also distinguishing between current and past infections, thus improving diagnostic capabilities.
Implementation Method 1
capable of hybridizing to and amplifying and/or detecting dengue virus nucleic acids
Implementation Method 2
reverse transcription polymerase chain reaction (RT-PCR) assay
Implementation Method 3
nucleic acid amplification assay
Data Source
AI summary
Methods and oligonucleotide reagents for diagnosing dengue virus infection are described. In particular, the invention relates to methods for detection, quantitation, and serotyping dengue virus, including serotypes 1-4. The dengue virus can be specifically detected by these methods even in samples containing other viruses, such as West Nile virus, Japanese encephalitis virus, tick-born encephalitis virus, HIV, or HCV.