Multiplex PCR Kinetic Signatures for Target Differentiation
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Solution Overview
Problem
Existing polymerase chain reaction (PCR) methods are limited by reactant concentrations, leading to non-exponential DNA amplification and difficulty in accurately detecting and distinguishing multiple nucleic acid targets due to rate limitations and saturation issues.
Innovation Solution
The method involves performing amplification reactions under constrained parameters, using nested or asymmetric PCR with varying primer concentrations and annealing temperatures, and generating kinetic signatures to detect and distinguish multiple nucleic acid targets by comparing measured signals to reference signatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If standard PCR is run to saturation with equal primer concentrations, then amplification reaction completes, but reaction becomes rate limited and amplification becomes linear instead of exponential
Solution Approach 1:
The patent applies asymmetric PCR by using unequal concentrations of forward and reverse primers. Specifically, one primer is used at a lower concentration than the other primer, creating asymmetric binding conditions that prevent rate limitation and maintain exponential amplification throughout the reaction cycle, thereby resolving the contradiction between amplification rate and linearity
Solution Approach 2:
The patent changes the concentration parameter of primers from equal to unequal values. By adjusting the primer concentration ratio (e.g., 1:10 or 10:1), the reaction avoids saturation kinetics and maintains exponential growth, transforming the amplification curve from linear to exponential while improving both productivity and reliability
2Adaptability or versatility
If multiple nucleic acid targets are detected using standard PCR, then detection is performed, but targets cannot be accurately distinguished due to rate limitations and saturation
Solution Approach 1:
The patent segments the detection of multiple targets by assigning each target a unique kinetic signature through asymmetric PCR conditions. Each target's amplification curve is distinguished by specific parameters (slope, inflection point, plateau timing), allowing individual identification and differentiation, thereby enabling both multi-target detection and precise target distinction
Solution Approach 2:
The patent uses kinetic signature profiles as detectable 'signatures' for each target, analogous to color changes in indicators. By monitoring fluorescence over time and identifying unique kinetic patterns (exponential phase timing, inflection points, plateau characteristics), the system distinguishes between multiple targets with high precision while maintaining versatility
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 allows for precise detection and differentiation of multiple nucleic acid analytes by generating characteristic curves that indicate their presence or absence, enabling accurate quantification and diagnosis of diseases or conditions.
Implementation Method 1
By thermal cycling a reaction cocktail of short primer sequences, free nucleotides and DNA polymerase, a template strand can be copied
Implementation Method 2
a high temperature for denaturation of the amplicon of interest
Implementation Method 3
a low temperature for the binding of primers to the template
Implementation Method 4
an intermediate temperature for the synthesis of a complement strand
Implementation Method 5
When fluorescent reporters such as TaqMan probes, FRET probes, or intercalating dyes are used to interpret the extent of the DNA amplification, a fluorescence curve could be generated
Data Source
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AI summary
The present invention provides methods of detecting multiple distinct target nucleic acid analytes in a sample using amplification reaction using a kinetic signature from the signal generated during the amplification reaction.