Multiplex PCR Primer Grouping for Kinetic Target Differentiation
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Solution Overview
Problem
Existing PCR methods are limited by reactant concentrations, leading to non-exponential DNA amplification and difficulty in distinguishing between different target nucleic acid analytes, particularly when primer extension rates differ.
Innovation Solution
The method involves using a primer set with at least two primer groups, each with different annealing temperatures, and performing thermocycling with specific temperature cycles to generate a kinetic signature for each analyte, allowing for curve fitting and comparison to a reference signature to detect the presence or absence of multiple nucleic acid targets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a single set of primers is used in equal concentrations, then the reaction is simple to perform, but the reaction becomes rate limited and results in linear instead of exponential amplification
Solution Approach 1:
The patent applies asymmetry by using primer sets where the forward and reverse primers are present in unequal concentrations. This asymmetric primer concentration configuration prevents the reaction from becoming rate-limited by the less efficient primer, thereby maintaining exponential amplification kinetics and improving productivity while still being straightforward to implement.
2Productivity
If reactant concentrations are increased to overcome rate limitation, then exponential amplification is achieved, but the reaction becomes limited by other reactants such as polymerase or nucleotides
Solution Approach 1:
The patent applies parameter changes by systematically adjusting the concentration ratios of different reactants, specifically setting the forward primer concentration to be higher than the reverse primer concentration. This optimized parameter configuration maintains exponential amplification while avoiding limitation by other reactants, ensuring reliable and consistent reaction performance.
3Ease of operation
If standard PCR conditions are used, then the method is well-established and easy to perform, but it is difficult to distinguish between different target nucleic acid analytes
Solution Approach 1:
The patent applies local quality by introducing analyte-specific characteristics through asymmetric primer concentration configurations. Each target analyte can be distinguished by the specific kinetic signature produced under these localized concentration conditions, enabling precise differentiation while maintaining the overall simplicity and familiarity of standard PCR operations.
4Adaptability or versatility
If multiple primer groups with different annealing temperatures are used, then multiple analytes can be detected simultaneously, but the thermocycling protocol becomes more complex
Solution Approach 1:
The patent applies segmentation by dividing the detection task into separate primer groups, each targeting specific analytes with different annealing temperatures. This segmentation allows multiple analytes to be detected simultaneously in a single reaction, with each primer group operating independently under its optimal temperature conditions, thereby achieving versatility without excessive protocol complexity.
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 accurate detection and differentiation of multiple nucleic acid analytes by generating distinct kinetic signatures, overcoming reactant concentration limitations and enhancing the specificity and efficiency of PCR amplification.
Implementation Method 1
a first primer group of said primer set anneals to one of the target nucleic acid analytes and a second primer group of said primer set anneals to another of said target nucleic acid analytes
Implementation Method 2
a high temperature for denaturation of the amplicon of interest
Implementation Method 3
the synthesis of a complement strand
Implementation Method 4
When fluorescent reporters such as TaqMan probes, FRET probes, or intercalating dyes are used to interpret the extent of the DNA amplification
Data Source
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AI summary
The present invention relates to methods of nucleic acid analyte detection by PCR. In particular, methods and kits for the detection of a plurality of nucleic acid analytes and the generation of kinetic signatures are provided. Further provided are methods and kits of nested PCR and PCR using limiting primers.