Chikungunya E1 Primer Design for Low-Level Viral RNA Detection
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Solution Overview
Problem
Existing diagnostic methods for Chikungunya virus detection lack primers that specifically bind to the defined region of the virus's nucleic acid sequence, leading to inefficiencies in detection and amplification.
Innovation Solution
Development of primer pairs and kits that include amplification oligonucleotides and hybridization probes specifically designed to target and amplify Chikungunya virus nucleic acids, with high sensitivity and specificity, allowing for accurate detection through in vitro nucleic acid amplification and hybridization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing diagnostic methods use generic primers for virus detection, then the detection process can be performed, but the detection sensitivity and specificity are insufficient due to lack of binding to specific viral regions
Solution Approach 1:
The patent applies preliminary action by pre-designing and optimizing primer sequences that specifically target conserved regions of the Chikungunya virus genome before detection is needed. The primers are designed with specific length (18-22 nucleotides) and melting temperature (55-65°C) characteristics in advance, allowing immediate use for high-sensitivity detection without requiring de novo primer design during diagnostic procedures.
Solution Approach 2:
The patent applies local quality by designing primers that target specific conserved regions of the Chikungunya virus genome rather than using generic primers. The primers are optimized to bind to particular sequences in the viral RNA, ensuring high specificity and sensitivity for Chikungunya detection while maintaining simplicity in the overall diagnostic approach.
2Measurement precision
If primer sequences are optimized for high specificity binding, then detection accuracy improves, but the risk of false negatives due to viral mutations increases
Solution Approach 1:
The patent applies universality by designing primers that target highly conserved regions of the Chikungunya virus genome that are common across different viral strains and geographic isolates. This allows the same primer set to detect diverse Chikungunya virus variants with high accuracy while maintaining reliability across different outbreak contexts and viral evolutionary changes.
3Measurement precision
If the detection method uses multiple amplification cycles, then the detection sensitivity increases, but the detection time increases proportionally
Solution Approach 1:
The patent applies parameter changes by optimizing the number of amplification cycles to a specific range (25-35 cycles) that achieves the optimal balance between detection sensitivity and detection time. This parameter optimization ensures sufficient amplification of viral RNA for reliable detection while minimizing the time required for the diagnostic test, making it suitable for rapid diagnostic applications.
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 and kits provide high probability (>95%) of detecting Chikungunya virus nucleic acids in a range of concentrations from 26 to 3,400 copies/ml, enabling reliable diagnosis and differentiation between presence and absence of the virus.
Implementation Method 1
a first amplification oligonucleotide that is up to 100 bases in length and that is complementary to at least 15 contiguous bases contained within SEQ ID NO: 14, and a second amplification oligonucleotide that is up to 100 bases in length and that is complementary to at least 15 contiguous bases of an extension product of the first amplification oligonucleotide when a polynucleotide consisting of SEQ ID NO: 14 is the template in a template-dependent primer extension reaction
Implementation Method 2
performing an in vitro nucleic acid amplification reaction using nucleic acids of the test sample as templates together with the set of amplification oligonucleotides
Data Source
Figure 1
AI summary
Methods, kits and amplification primer binding to E1 gene for detecting Chikungunya viral nucleic acids. Preferred methods use promoter-primers, hybridisation probes and capture probes which allow for detecting very low levels of the viral nucleic acids using nucleic acid amplification.