NESBA Isothermal RNA Detection via Nicking Enzyme Chain Reaction
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Solution Overview
Problem
Current RNA virus detection methods, such as RT-PCR, require sophisticated temperature control, limiting their use to specialized facilities, and existing isothermal NASBA techniques face efficiency issues due to dependence on T7 RNA polymerase transcription efficiency, which can lead to false signals.
Innovation Solution
A nicking/extension-chain-reaction-system-based isothermal nucleic acid amplification method that uses primers with DNA nicking enzyme recognition sequences to exponentially amplify T7-promoter-containing double-stranded DNA, producing anti-sense RNA with enhanced sensitivity and efficiency, allowing for detection without expensive temperature control equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If RT-PCR technique is used for target RNA detection, then detection sensitivity is improved, but device complexity and temperature control requirements increase
Solution Approach 1:
The invention changes the temperature parameter from variable (RT-PCR requires cycling through multiple temperatures) to constant (isothermal at 41°C), simplifying the heating device while maintaining high detection sensitivity through the nicking/extension chain reaction mechanism
Solution Approach 2:
The invention replaces the mechanical temperature cycling system of RT-PCR with a biochemical nicking/extension mechanism that operates isothermally, where DNA polymerase and nicking enzymes perform the amplification function without requiring complex thermal control
2Device complexity
If NASBA technique is used for isothermal amplification, then temperature control complexity is reduced, but amplification efficiency decreases due to dependence on T7 RNA polymerase transcription
Solution Approach 1:
The invention introduces a DNA intermediate with T7 promoter sequence that is amplified by DNA polymerase (high efficiency) and then transcribed by T7 RNA polymerase, separating the amplification and transcription functions to overcome the limitation of direct RNA-dependent RNA synthesis in NASBA
Solution Approach 2:
The invention segments the amplification process into distinct DNA amplification and RNA transcription stages, allowing each enzyme (DNA polymerase and T7 RNA polymerase) to operate at its optimal efficiency without the limitations of single-enzyme NASBA
3Measurement precision
If RT-PCR is used for RNA virus detection, then detection accuracy is improved, but ease of operation and accessibility to specialized facilities decrease
Solution Approach 1:
The invention uses a simple, disposable isothermal heating device that can be manufactured at low cost without requiring sophisticated temperature control systems, making the detection method accessible to non-specialized facilities while maintaining high detection accuracy
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 high sensitivity and amplification efficiency for target RNA detection, comparable to RT-PCR, while enabling on-site diagnosis and reducing the risk of false signals, with a limit of detection as low as 0.72 fM, and is applicable in both specialized and non-specialized settings.
Implementation Method 1
a nicking enzyme recognizing a nicking enzyme recognition nucleotide sequence in a double-stranded DNA cleaves a nicking enzyme recognition site of the double-stranded DNA
Implementation Method 2
amplifying a T7-promoter-containing double-stranded DNA
Implementation Method 3
producing an anti-sense RNA from a T7-promoter-containing double-stranded DNA
Implementation Method 4
producing complementary DNA of the target RNA
Data Source
AI summary
The present invention relates to a detection method for detecting a target RNA contained in a sample with high sensitivity by using nicking/extension chain reaction system-based isothermal nucleic acid amplification (NESBA) that uses activity of a cleavage enzyme and a DNA polymerase. The NESBA of the present invention is a new concept isothermal target RNA detection method that realizes higher amplification efficiency than the existing NASBA technology and is deemed to be utilizable as a new concept diagnosis technology that can replace conventional target RNA detection technologies.