Dengue Virus Detection Primers Serotyping Specificity
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Solution Overview
Problem
Current diagnostic methods for detecting dengue virus (DENV) in biological samples face challenges due to cross-reactivity with other flaviviruses, limited sensitivity, and inability to differentiate between DENV serotypes, especially in areas with high virus circulation, making early and specific detection difficult.
Innovation Solution
The development of specific primers and probes for PCR-based assays that can amplify and detect all four DENV serotypes with high specificity, using degenerate nucleotide substitutions to improve recognition of sequence variations, allowing for both singleplex and multiplex detection formats.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If serological methods are used to detect DENV, then detection can be performed, but cross-reactivity with other flaviviruses occurs and serotyping is complicated
Solution Approach 1:
The patent replaces serological methods (antibody-based detection) with molecular biology methods (PCR-based nucleic acid detection). This substitution eliminates cross-reactivity issues inherent in serological approaches while enabling precise serotyping through sequence-specific amplification and detection of viral RNA from different DENV serotypes.
Solution Approach 2:
The patent changes the detection parameter from antibody-antigen interaction (serology) to nucleic acid sequence specificity (PCR). By targeting unique genomic sequences of each DENV serotype, the method achieves both reliable detection and accurate serotyping without cross-reactivity problems.
2Reliability
If standard PCR methods are used to detect DENV, then viral RNA detection is possible, but sensitivity is limited and early infection detection is difficult
Solution Approach 1:
The patent performs reverse transcription of viral RNA to cDNA before PCR amplification. This preliminary conversion step enables the use of highly sensitive PCR methods to detect even low levels of viral RNA present during early infection, significantly improving detection sensitivity compared to direct RNA-based methods.
Solution Approach 2:
The patent employs a one-step RT-PCR approach where reverse transcription and PCR amplification are combined in a single reaction mixture. This disposable, integrated approach maximizes sensitivity by preventing RNA degradation and loss that would occur with separate handling steps, enabling reliable detection of early infections.
3Adaptability or versatility
If degenerate primers are used to detect multiple DENV serotypes, then broad detection is achieved, but specificity may be reduced
Solution Approach 1:
The patent uses degenerate primers with strategically placed variable positions that correspond to conserved regions across all four DENV serotypes. The degeneracy is localized to specific nucleotide positions where sequence variation occurs, while maintaining high specificity at other positions. This allows single primers to universally amplify all DENV serotypes without cross-reacting with non-DENV flaviviruses.
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 provides a sensitive and confident detection of DENV in clinical samples, even in the early stages of infection, with improved ability to differentiate between serotypes and reduce cross-reactivity, enhancing diagnostic accuracy and reliability.
Implementation Method 1
producing an amplification product by amplifying a nucleotide sequence using a forward primer that hybridizes to a first region within the Dengue virus genome, and a reverse primer that hybridizes to a second region within the Dengue virus genome, under conditions suitable for a polymerase chain reaction
Implementation Method 2
a forward primer that hybridizes to a first region within the Dengue virus genome, and a reverse primer that hybridizes to a second region within the Dengue virus genome
Data Source
AI summary
Processes for detecting Dengue virus (DENV) nucleic acid in a sample are provided including producing an amplification product by amplifying DENV nucleotide sequence and detection of an amplification by hybridization of a probe or other technique. The processes use primers or probes with introduced mutations and or degenerate bases that provide excellent superiority in detection and serotyping of DENV in a sample.