Dengue Virus Assay Uniform Sensitivity
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Solution Overview
Problem
Current nucleic acid-based assays for detecting Dengue virus serotypes 1-4 face challenges in achieving uniform sensitivity due to limited nucleic acid sequence conservation, leading to varying detection efficiencies across different serotypes.
Innovation Solution
A method involving specific primers and probes, such as those with target-hybridizing sequences like SEQ ID NO:1 and SEQ ID NO:10, is used for in vitro nucleic acid amplification, allowing for the detection of Dengue virus serotypes 1-4 at concentrations as low as 20 copies/ml, with optional upstream promoter and tag sequences that do not hybridize independently, enabling uniform sensitivity across all serotypes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional nucleic acid-based assays are used for detecting Dengue virus serotypes, then detection capability is achieved, but sensitivity varies across different serotypes due to limited nucleic acid sequence conservation
Solution Approach 1:
The assay system is segmented into multiple serotype-specific primer sets (DEN-1, DEN-2, DEN-3, DEN-4) that can be used individually or in combination. Each primer set is optimized for its specific serotype, allowing the system to achieve high sensitivity for each individual serotype while maintaining the ability to detect all four serotypes uniformly when all primer sets are employed together.
Solution Approach 2:
The invention provides a universal Dengue virus detection system that can detect all four serotypes through a standardized assay platform. The universal aspect is achieved by supplying multiple serotype-specific primer sets that work within the same RT-PCR framework, enabling a single laboratory setup to detect any Dengue serotype with uniform sensitivity.
2Adaptability or versatility
If serological tests are used for Dengue detection, then cross-reactivity among virus serotypes is observed, but cross-protective immunity does not develop
Solution Approach 1:
The detection system is divided into four distinct serotype-specific primer sets, each targeting unique nucleic acid sequences specific to DEN-1, DEN-2, DEN-3, or DEN-4. This segmentation eliminates cross-reactivity by ensuring that each primer set only binds to its specific serotype target, allowing precise differentiation and accurate identification of the infecting serotype.
3Adaptability or versatility
If a single assay is designed to detect all four Dengue serotypes, then comprehensive detection is achieved, but sensitivity varies significantly among different serotypes
Solution Approach 1:
Each serotype-specific primer set is locally optimized with serotype-matched primers and probes that have been individually tuned for maximum sensitivity and specificity. The local quality optimization ensures that each primer-probe combination achieves equivalent high sensitivity for its specific serotype, thereby achieving uniform sensitivity across all four serotypes when the complete panel is used.
Solution Approach 2:
The assay parameters including primer concentrations, probe concentrations, hybridization temperatures, and amplification conditions are optimized for each serotype-specific primer set to achieve equivalent sensitivity. By adjusting these parameters locally for each serotype while maintaining the overall assay framework, uniform detection sensitivity across all four serotypes is achieved.
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 method achieves significantly improved sensitivity and uniformity in detecting all four Dengue virus serotypes, with the ability to detect serotypes at low concentrations, surpassing previous assays in sensitivity and robustness.
Implementation Method 1
The 3' terminal base sequence of a first member of the set of primers consists of a target-hybridizing sequence
Implementation Method 2
performing an in vitro nucleic acid amplification reaction using the obtained nucleic acids as templates for amplification
Data Source
AI summary
Nucleic acid assays for detecting nucleic acids of Dengue virus serotypes 1-4 derived from 5′ NTR.