Nucleic Acid Variant Detection via Melting Temperature Analysis
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Solution Overview
Problem
Current nucleic acid detection methods face challenges in efficiently differentiating between multiple variants of a target nucleic acid without the use of probes, particularly in real-time amplification reactions, and in accurately determining the presence or absence of specific nucleic acid variants.
Innovation Solution
The method involves using labeled oligonucleotides with light-emitting moieties and a soluble light emission modifier that quenches light emission when bound to double-stranded DNA, allowing for the amplification and differentiation of nucleic acid variants based on their melting temperatures, without the need for probes, by monitoring the signal under changing temperature conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple probes and labels are used to differentiate nucleic acid variants, then detection accuracy improves, but device complexity and cost increase
Solution Approach 1:
The invention extracts and removes the probe component from the detection system. Instead of using probes to differentiate nucleic acid variants, the method uses the amplification primers themselves, which are already present in the reaction mixture, and detects variants through melting temperature analysis of the amplified products. This eliminates the need for separate probe molecules and simplifies the overall system architecture.
Solution Approach 2:
The amplification primers serve multiple functions: they amplify the target nucleic acid and simultaneously enable variant differentiation through their sequence-specific binding and the resulting melting temperature characteristics of the amplicons. This multi-functionality replaces the need for separate probes that would otherwise be required for variant detection.
2Measurement precision
If multiple probes and labels are used to differentiate nucleic acid variants, then detection accuracy improves, but manufacturing cost increases
Solution Approach 1:
The invention removes the need for expensive fluorescently-labeled probes from the reaction mixture. By using unlabeled amplification primers and detecting variants through melting temperature analysis of the amplified products, the method eliminates a significant cost component while maintaining variant differentiation capability.
Solution Approach 2:
The method uses inexpensive, disposable amplification primers that are already part of the standard PCR reagent mix, replacing expensive, reusable probes. The primers are consumed in the amplification reaction, and their sequence information is leveraged for variant detection without requiring additional investment in probe synthesis and labeling.
3Device complexity
If melting temperature analysis is performed without probes, then device complexity reduces, but measurement precision may worsen
Solution Approach 1:
The amplified nucleic acid products serve their own detection function by exhibiting characteristic melting temperatures that reveal variant information. The amplicons themselves provide the signal needed for differentiation, eliminating the need for external probes to bind and report variant presence. This self-service approach maintains detection accuracy while simplifying the system.
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 efficient detection and differentiation of multiple nucleic acid variants by correlating the melting temperatures of amplicons with the presence of specific variants, reducing the need for multiple probes and labels, and improving the sensitivity and specificity of nucleic acid analysis.
Implementation Method 1
providing at least one soluble light emission modifier, which, when the modifier non-covalently binds double stranded DNA incorporating the labeled oligonucleotide, quenches light emission from the first label
Data Source
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AI summary
Methods, reaction mixtures and kits for detecting the presence or absence of a target nucleic acid variant from a selection of possible variants is described.