Catalytic Nucleic Acid Multiplexing via Melt Analysis
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Solution Overview
Problem
Current methods for multiplex PCR using catalytic nucleic acids are limited by the number of fluorescent detection channels available, leading to increased costs and restricted capability in detecting multiple target sequences.
Innovation Solution
The method involves forming a catalytically active nucleic acid enzyme by hybridizing component oligonucleotides with a facilitator and substrate nucleic acid, cleaving the substrate, and using melt analysis to distinguish cleaved and uncleaved substrates, allowing for multiplexing in a single color channel with unique melt profiles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple fluorescent detection channels are used to detect multiple target sequences, then the multiplexing capability is improved, but the device complexity and cost increase due to requiring multiple lasers and filters
Solution Approach 1:
The patent employs a single fluorescent detection channel that serves multiple functions by detecting different targets through melt analysis. Instead of requiring separate detection channels for each target, the system uses one channel to distinguish multiple targets based on their unique melt profiles, thereby reducing instrument complexity while maintaining multiplexing capability.
Solution Approach 2:
The patent distinguishes multiple targets by changing the parameter being measured from fluorescence intensity alone to melt temperature profiles. By monitoring the melt analysis parameter (temperature at which fluorescent signal changes), the system can differentiate between multiple targets using a single detection channel, avoiding the need for multiple lasers and filters.
2Adaptability or versatility
If multiple fluorescent detection channels are used to detect multiple target sequences, then the multiplexing capability is improved, but the cost increases due to requiring multiple lasers and filters
Solution Approach 1:
A single fluorescent detection channel is designed to perform multiple detection functions simultaneously. By using melt analysis to differentiate targets based on their unique thermal profiles, the system eliminates the need for multiple expensive lasers and filters, thereby reducing instrument cost while maintaining the ability to detect multiple targets.
Solution Approach 2:
Instead of creating multiple physical detection channels with different optical components, the system creates virtual differentiation through melt analysis profiles. Each target has a characteristic melt profile that acts as a unique identifier, allowing the single detection channel to effectively 'copy' the functionality of multiple channels at lower cost.
3Measurement precision
If catalytic nucleic acids are used for real-time PCR detection, then the sensitivity and dynamic range are improved, but the multiplexing capability is limited by the number of fluorescent detection channels
Solution Approach 1:
The patent adds a new dimension to detection by incorporating melt analysis (temperature variable) to the traditional fluorescence intensity measurement. This dimensional expansion allows the system to distinguish multiple targets within a single fluorescent channel, overcoming the limitation imposed by the fixed number of detection channels while preserving the sensitivity benefits of catalytic nucleic acids.
Solution Approach 2:
The system monitors changes in the melt temperature parameter in addition to fluorescence intensity. By measuring the temperature at which the fluorescent signal changes during melt analysis, the system creates additional discriminatory power that enables multiplexing without requiring multiple fluorescent channels, thus maintaining detection sensitivity while improving multiplexing capability.
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 the detection of up to 30 different targets in a single reaction, overcoming the limitations of existing multiplexing capabilities and reducing costs by utilizing a single color channel for multiple targets.
Implementation Method 1
cleaving the substrate nucleic acid with the catalytically active nucleic acid enzyme at a cleavage site to form a 5' fragment and a 3' fragment of the substrate nucleic acid
Implementation Method 2
hybridizing the 5' fragment of the substrate nucleic acid to a capture probe, wherein the capture probe comprises a first region that is complementary to the 5'-fragment of the substrate nucleic acid
Implementation Method 3
extending the extendable 5'-fragment of the substrate nucleic acid along the capture probe
Implementation Method 4
performing melt analysis on a double-stranded extension product formed by extending the extendable 5'-fragment of the substrate nucleic acid along the capture probe
Data Source
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AI summary
Methods and compositions for assays using catalytic DNA (e.g., that can substrate nucleic acid sequences) are provided.