LAMP Master Mix Colorimetric Detection for Rapid Diagnostics
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Solution Overview
Problem
Current molecular diagnostic tests for infectious agents, such as the SARS-CoV-2 virus, face challenges with sensitivity and accuracy due to mutations in viral genomes, particularly RNA viruses, which can lead to false negatives or reduced detection efficiency, especially with methods like RT-qPCR, and require sophisticated equipment and technical expertise.
Innovation Solution
A master mix comprising a DNA polymerase suitable for isothermal amplification, dNTPs, and a dye that changes color or fluorescence in response to DNA amplification, including pH-sensitive or metallochromic indicators, is used for Loop-Mediated Isothermal Amplification (LAMP) reactions, allowing for robust and simple detection of nucleic acids without expensive instrumentation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If RT-qPCR is used for molecular diagnostic testing, then detection sensitivity and accuracy are improved, but device complexity and cost increase due to requirement for expensive laboratory instruments and multiple steps
Solution Approach 1:
The patent replaces complex mechanical/instrumental detection systems with a simple colorimetric detection system. The LAMP amplification reaction produces color changes visible to the naked eye, eliminating the need for expensive qPCR instruments, thermal cyclers, and fluorescent detection systems while maintaining high detection sensitivity through isothermal amplification.
Solution Approach 2:
The patent employs colorimetric indicators that change color in response to pH changes during LAMP amplification. This allows visual detection of nucleic acid amplification without sophisticated instrumentation, directly resolving the contradiction between detection sensitivity and device complexity by using simple color changes as the detection mechanism.
2Measurement precision
If RT-qPCR is used for molecular diagnostic testing, then detection sensitivity is improved, but ease of operation deteriorates due to requirement for multiple steps and technical expertise
Solution Approach 1:
The patent replaces the complex multi-step RT-qPCR protocol with a simplified isothermal LAMP reaction that can be performed in a single step at constant temperature. The colorimetric detection eliminates the need for complex data analysis and interpretation, making the test accessible to users without specialized training while maintaining high detection sensitivity.
Solution Approach 2:
The patent integrates all necessary reagents including DNA polymerase, dNTPs, primers, and colorimetric indicators into a pre-mixed master mix formulation. This segmentation of the complex protocol into a single ready-to-use reagent mixture eliminates multiple preparation steps and reduces the technical expertise required for operation.
3Measurement precision
If molecular diagnostic tests target specific viral sequences, then detection specificity is improved, but reliability deteriorates when mutations occur in the targeted regions leading to false negatives
Solution Approach 1:
The patent designs LAMP primers that target highly conserved regions of the viral genome that are less prone to mutations. The method can detect multiple viral variants simultaneously by targeting universal conserved sequences, making the test more reliable across different viral strains while maintaining detection specificity for the target pathogen.
Solution Approach 2:
The patent employs a multi-primer LAMP system that can adapt to detect different viral variants. By using multiple primer sets targeting different conserved regions, the system dynamically adjusts its detection capability to maintain reliability even when viral mutations occur in any single targeted region.
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 enables rapid, specific, and sensitive detection of target nucleic acids, including viral RNA, with improved resistance to mutations and the ability to perform tests outside laboratory settings, enhancing surveillance and control efforts during epidemics.
Implementation Method 1
a dye that changes color or fluorescence in response to DNA amplification, including pH-sensitive or metallochromic indicators
Implementation Method 2
a dye that changes color or fluorescence in response to DNA amplification
Implementation Method 3
a DNA polymerase suitable for isothermal amplification of DNA
Data Source
AI summary
Compositions and methods are described that are directed to specific and sensitive methods of target nucleic acid detection and more specifically detecting target nucleic acids directly from biological samples. The compositions and methods were developed to be easy to use involving a minimum number of steps and giving rapid and consistent results either at point of care or in high throughput situations. The compositions and methods are directed to labelled probes and their uses in Loop-Mediated Isothermal Amplification (LAMP) diagnostic tests to detect target DNA from the environment or from an individual and also to detect specific variants of the target DNA, both with similar sensitivity. The compositions and methods may use any single improvement or combination of improvements selected from thermolabile enzyme variants, poloxamers, various salts, indicators and one or more LAMP primer sets for detecting single and/or multiple targets, probes for detecting variants of the targets including SARS-CoV-2 variants and lateral flow devices.