LAMP Detection of JAK2 V617F Mutation Using Segmented Primers
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for detecting the JAK2 V617F mutation, such as direct sequencing, Amplification Refractory Mutation System (ARMS), and Restriction Fragment Length Polymorphism (RFLP) analysis, suffer from low sensitivity, requiring labor-intensive enrichment steps and expensive, specialized equipment, limiting their effectiveness in clinical settings.
Innovation Solution
A novel Loop-Mediated Isothermal Amplification (LAMP) method using a specific set of primers and a kit that enables simultaneous selective amplification and detection of the mutation, achieving high sensitivity down to 0.01% mutant sequences in a wild-type background, and is cost-effective with simple instrumentation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If direct sequencing, ARMS, or RFLP analysis is used to detect the JAK2 V617F mutation, then the detection can be performed with standard equipment, but the sensitivity is low (requiring enrichment steps) and the procedure is labor-intensive
Solution Approach 1:
The detection method is segmented into two independent LAMP reactions performed in parallel: one reaction detects the mutant allele while the other detects the wild-type allele. Each reaction uses specifically designed primers that only amplify their target sequence, allowing simultaneous detection without enrichment steps and achieving high sensitivity with simple操作流程
Solution Approach 2:
The patent introduces a dual-reporter fluorescence system where two different fluorescent dyes (e.g., FAM and HEX) serve as intermediaries to distinguish between mutant and wild-type amplification products. This allows real-time differentiation of alleles during the LAMP reaction without requiring post-amplification analysis or enrichment procedures
2Measurement precision
If ARMS or real-time PCR techniques are used for mutation detection, then sensitivity can reach 1-2% or 0.5-1%, but expensive specialized equipment is required
Solution Approach 1:
The patent employs disposable fluorescent dyes and simple plasticware for the LAMP reactions, replacing expensive specialized detection equipment. The fluorescence-based readout can be performed with standard plate readers or even visual inspection under UV light, making high-sensitivity detection accessible without costly instrumentation
Solution Approach 2:
The patent replaces complex mechanical detection systems (such as those required for ARMS or RFLP analysis) with a chemical-fluorescence based detection system. The LAMP amplification itself generates sufficient signal through fluorescent dye binding to amplified DNA, eliminating the need for post-amplification processing equipment or specialized detection instruments
3Measurement precision
If enrichment steps are performed to achieve adequate sensitivity for mutation detection, then detection sensitivity improves, but the procedure time and labor increase significantly
Solution Approach 1:
The patent performs preliminary action by designing primers with high specificity for the mutant and wild-type sequences, allowing direct amplification without enrichment. The LAMP primers are engineered to bind exclusively to their target sequences, enabling sensitive detection of low-abundance mutant alleles directly from clinical samples without time-consuming enrichment procedures
Solution Approach 2:
The patent implements continuous useful action through real-time fluorescence monitoring of the LAMP reactions. The amplification and detection occur simultaneously in the same reaction tube throughout the entire incubation period, eliminating separate detection steps and reducing total procedure time while maintaining high sensitivity
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 method allows for rapid, isothermal detection of the JAK2 V617F mutation in one hour, providing clear differentiation between heterozygotic and homozygotic forms and requiring minimal equipment, significantly improving sensitivity and reducing procedural time and costs.
Implementation Method 1
a solution comprising a mixture of oligonucleotides and a DNA polymerase having strand displacement activity under hybridization conditions, wherein said mixture of oligonucleotides consists of primers suitable for the loop mediated isothermal amplification of the region of the target nucleic acid molecule including the nucleic acid position of the point mutation to be detected
Implementation Method 2
a stem-loop mutant extensible primer comprising: a central loop sequence able to selectively recognize and hybridize to a region of the target nucleic acid molecule comprising the point mutation
Implementation Method 3
a DNA polymerase having strand displacement activity under hybridization conditions
Data Source
AI summary
The present invention refers to a method for detecting a point mutations of a nucleotide sequence by an improvement of the LAMP (loop amplification mediated polymerization) amplification method, as well as to a set of primers and kit therefor. As a non limitative embodiment, the invention refers to the G1849T mutation of the JAK2 gene.