Flavivirus Primer Sets via LNA and Sequence Optimization
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Solution Overview
Problem
Current methods for detecting flaviviruses, such as dengue, yellow fever, Japanese encephalitis, West Nile, and Zika viruses, suffer from low sensitivity and high false-positive rates due to primer dimerization issues, necessitating the development of more effective general-purpose primers for accurate and early detection.
Innovation Solution
Designing a pair of primers with optimized nucleotide sequences and secondary structure analysis to enhance amplification efficiency and specificity, utilizing locked nucleic acid (LNA) and performing RT-PCR for sensitive detection of flaviviruses, including dengue, Japanese encephalitis, West Nile, yellow fever, and Zika viruses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional primers are used for flavivirus detection, then the detection method is simple, but the sensitivity is low and false-positive rates are high due to primer dimerization
Solution Approach 1:
The patent applies parameter changes by optimizing primer nucleotide sequences, modifying secondary structures, and adjusting primer concentrations to eliminate dimerization while maintaining detection sensitivity. Specific parameter optimizations include GC content, melting temperature, and primer length to prevent self-complementarity that causes dimer formation
Solution Approach 2:
The patent uses composite primer designs combining multiple functional elements including LNA (locked nucleic acid) modifications, mismatched bases at specific positions, and optimized 5'-3' directional sequences to create primers that resist dimerization while enhancing specific binding to flavivirus RNA
2Productivity
If conventional primers are used for flavivirus detection, then the primer design is simple, but the amplification efficiency and specificity are low
Solution Approach 1:
The patent optimizes amplification efficiency by adjusting critical parameters including annealing temperature, extension time, Mg2+ concentration, and primer concentration. The secondary structure analysis and melting temperature calculations guide parameter selection to maximize specific amplification while minimizing non-specific products
Solution Approach 2:
The patent performs preliminary secondary structure analysis and in silico modeling of primer-dimer interactions before finalizing primer sequences. This preliminary assessment allows optimization of primer designs to prevent dimerization issues before actual PCR amplification, improving efficiency from the outset
3Measurement precision
If conventional primers are used for flavivirus detection, then the detection limit is high (3,000,000 copies), but the method is easier to perform
Solution Approach 1:
The patent achieves a detection limit improvement from 3,000,000 to 3-300 copies through optimized primer parameters including enhanced binding affinity, adjusted annealing temperatures, and modified extension conditions. These parameter changes increase amplification efficiency enough to detect much lower viral loads
Solution Approach 2:
The patent introduces LNA (locked nucleic acid) as an intermediary modification to conventional primers, which enhances binding strength and specificity. This intermediary element allows the primer to bind more effectively to target RNA at lower concentrations, enabling detection of fewer viral copies while maintaining operational simplicity
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 new primer set achieves high sensitivity and specificity, reducing false positives and enabling early detection of flavivirus influx and infection, with a detection limit improved from 3,000,000 to 3-300 copies, significantly surpassing conventional methods.
Implementation Method 1
a primer consist of the nucleotide sequence of SEQ ID NO: 1 and a primer consist of the nucleotide sequence of SEQ ID NO: 2
Implementation Method 2
performing RT-PCR for sensitive detection of flaviviruses
Implementation Method 3
utilizing locked nucleic acid (LNA) and performing RT-PCR for sensitive detection of flaviviruses
Data Source
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AI summary
The present invention relates to general-purpose primer sets for detecting flaviviruses, a kit for diagnosing flaviviruses comprising the primer sets, and a flavivirus diagnosis method. By using a pair of general-purpose primer sets for detecting flaviviruses, all of Dengue virus type 1, Dengue virus type 2, Dengue virus type 3, Dengue virus type 4, Japanese encephalitis virus, West Nile virus, yellow fever virus, and Zika virus can be detected with high sensitivity from a sample. In addition, the false-positive response problem, which is a chronic problem of existing general-purpose primer sets for detecting flaviviruses, is improved, and thus the influx of flaviviruses and infections thereby can be effectively detected.