Multiplexing Fluorescent Compounds in PCR Assays
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Solution Overview
Problem
Current molecular diagnostics, such as PCR assays, are limited in detecting multiple pathogens in parallel from a single sample due to constraints in sample volume, cost, and the number of distinguishable detection channels, particularly when using fluorescent compounds with similar peak excitation and emission spectra.
Innovation Solution
The method involves multiplexing fluorescent compounds with unique properties in a common spectral channel, allowing for increased throughput by utilizing their distinct responses to physical testing conditions such as temperature, pH, and light intensity, enabling the detection of multiple pathogens without requiring larger sample volumes or additional detection channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple fluorescent compounds with similar peak excitation and emission spectra are used to detect multiple pathogens, then the number of distinct pathogens that can be detected in parallel increases, but the ability to differentiate between individual fluorescent signals deteriorates
Solution Approach 1:
The patent changes physical parameters (temperature, pH, ionic strength) to alter the fluorescence properties of different compounds. By measuring fluorescence intensity at multiple different physical conditions, the system can differentiate between compounds with similar spectral characteristics, resolving the signal differentiation problem while maintaining high pathogen detection capacity
Solution Approach 2:
The patent adds a new dimension to fluorescence detection by incorporating physical condition variations (temperature, pH, ionic strength) as additional measurement parameters. This transforms the detection from a single spectral dimension to multiple dimensions, enabling differentiation of fluorescent signals that overlap in traditional spectral space
2Measurement precision
If traditional spectral channel differentiation is used to detect multiple pathogens, then signal differentiation is maintained, but the number of detectable pathogens is limited by the number of available detection channels
Solution Approach 1:
Instead of relying solely on spectral channel differentiation, the patent utilizes changes in physical parameters (temperature, pH, ionic strength) to create distinguishable fluorescence responses. This allows multiple pathogens to be detected within the same spectral channel by exploiting the unique physical condition responses of different fluorescent compounds
Solution Approach 2:
The patent makes a single spectral channel multi-functional by enabling it to detect multiple pathogens simultaneously through physical condition-based differentiation. The same detection channel can distinguish between different fluorescent compounds by measuring their responses to varying physical conditions, effectively allowing one channel to perform the work of multiple channels
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 significantly enhances the number of distinct pathogens that can be detected in parallel from a single sample, improving diagnostic throughput without increasing costs or sample volume, by leveraging unique properties of fluorescent compounds to differentiate targets beyond traditional spectral channel limitations.
Implementation Method 1
utilizing properties of the fluorescent compounds themselves, which can allow for a significantly higher throughput of molecular diagnostic results
Data Source
AI summary
The number of unique testable conditions that can be detected in parallel from a sample in a PCR assay can be increased without need for larger sample volumes or additional expensive instruments. At least two fluorescent compounds, each designed to have a peak fluorescence excitation and/or emission within a common spectral channel, can be added to a sample in a tube, wherein each of the at least two fluorescent compounds is used to test for a unique testable condition. PCR assay can be performed on the contents of the tube. Then a spectral channel signal of each of the at least two fluorescent compounds can be determined based on fluorescence emission measurements and at least two properties of each of the at least two fluorescent compounds, wherein the spectral channel signals are analyzed to indicate a presence or absence of each of the unique testable conditions.