LAMP Oligonucleotides for SARS-CoV-2 Detection
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Solution Overview
Problem
Current COVID-19/SARS-CoV-2 detection tests rely on complex and expensive real-time RT-PCR platforms, limiting access and delaying results, especially in resource-limited regions, and are susceptible to false negatives due to emerging variants.
Innovation Solution
Development of oligonucleotides and kits for loop-mediated isothermal amplification (LAMP) that target conserved regions of SARS-CoV-related betacoronaviruses, enabling rapid, visual, and real-time detection of SARS-CoV-2 and other bat-origin betacoronaviruses using simple equipment, suitable for point-of-care diagnostics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If real-time RT-PCR platforms are used for SARS-CoV-2 detection, then detection accuracy is improved, but device complexity and cost increase
Solution Approach 1:
The patent replaces the complex mechanical and computational systems of real-time RT-PCR with a simpler LAMP-based isothermal amplification system that uses temperature-controlled heating blocks instead of complex thermal cyclers, and visual colorimetric detection instead of fluorescent probes and real-time monitoring systems
Solution Approach 2:
The patent employs disposable colorimetric indicators and single-use test kits that eliminate the need for expensive, complex instrumentation. The visual detection system uses inexpensive chemical indicators that change color based on pH changes during amplification, replacing costly fluorescent detection systems
2Measurement precision
If real-time RT-PCR platforms are used for SARS-CoV-2 detection, then detection accuracy is improved, but time consumption increases
Solution Approach 1:
The patent changes the fundamental parameter of amplification from cyclic thermal cycling (RT-PCR) to isothermal amplification at a constant temperature (65°C), eliminating the time-consuming heating and cooling cycles while maintaining amplification efficiency and detection accuracy
Solution Approach 2:
The patent replaces the time-intensive real-time monitoring and data analysis systems of RT-PCR with immediate visual colorimetric readout, providing results in 30-45 minutes without the need for complex instrumentation and prolonged processing
3Measurement precision
If real-time RT-PCR platforms are used for SARS-CoV-2 detection, then detection capability is improved, but accessibility worsens
Solution Approach 1:
The patent replaces centralized laboratory infrastructure with portable, point-of-care devices that require only simple heating blocks and visual inspection, enabling testing in remote and resource-limited settings without specialized laboratories or trained personnel
Solution Approach 2:
The patent employs self-contained test kits with pre-loaded reagents and built-in colorimetric indicators that automatically signal results through visual color changes, eliminating the need for specialized expertise in sample processing, amplification, and data interpretation
4Ease of operation
If LAMP-based detection is used, then ease of operation is improved, but measurement precision may worsen
Solution Approach 1:
The patent introduces pH-sensitive colorimetric indicators as intermediaries that translate the biochemical amplification process into clear visual signals. These indicators respond to pH changes caused by amplification byproducts, providing unambiguous positive/negative results that maintain high detection accuracy despite the simplified operational procedure
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 LAMP-based detection method provides rapid, sensitive, and specific results in 45 minutes or less, capable of detecting SARS-CoV-2 variants and other zoonotic coronaviruses without the need for specialized equipment, improving access to timely diagnostic information.
Implementation Method 1
LAMP utilizes a strand displacing DNA polymerase and 4 to 6 primers targeting 6-8 regions of a target nucleic acid sequence. Polymerization from the primers leads to stem-loop formation at the ends of nascent amplified DNA that permits additional priming and concatemeric amplification of DNA at a single temperature.
Implementation Method 2
described are kits for rapid colorimetric in vitro detection of SARS-CoV-related betacoronavirus. In some embodiments, detection of SARS-CoV-related betacoronaviruses in a sample is indicated by a visual endpoint.
Data Source
AI summary
Described are oligonucleotides (LAMP primers), compositions, kits, and method for loop-mediated-isothermal amplification (LAMP) and/or detection of SARS-CoV-related betacoronaviruses. The methods can be used to in diagnosing SARS-CoV-2 infection.