Real-Time Digital PCR Device with Segmented Detection
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Solution Overview
Problem
Conventional digital PCR technologies lack real-time monitoring capabilities, which limits their ability to provide valuable kinetic information, discriminate small fold-differences in gene quantities, and detect multiple target sequences effectively.
Innovation Solution
A real-time digital PCR device with multiple independently-controlled mini-PCR reactors, a detection unit, and a motorized mechanism for moving the reactors or detection unit, allowing for simultaneous performance of multiple digital PCRs with real-time monitoring and generation of amplification curves for individual PCR processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If conventional digital PCR is performed by detecting end point reaction products, then the device complexity is reduced, but real-time kinetic information is lost
Solution Approach 1:
The system segments the detection process by assigning individual detection units to specific time points or PCR cycles. Multiple detection units capture fluorescence signals at different stages of amplification, enabling reconstruction of kinetic curves without requiring a single complex real-time detection system
Solution Approach 2:
The system performs preliminary detection actions at predetermined time points during PCR amplification. Detection units are positioned and activated in advance to capture signals at specific cycles, allowing kinetic information to be gathered through pre-planned measurement points rather than continuous monitoring
2Adaptability or versatility
If multiple target sequences are to be detected using the same fluorescent probe, then the versatility of the detection system is improved, but the difficulty of detecting and measuring increases
Solution Approach 1:
The system distinguishes multiple target sequences by adding the dimension of temporal measurement. Instead of relying solely on spectral differences, it measures fluorescence intensity across multiple time points during PCR amplification, creating kinetic profiles that differentiate targets even when using the same probe
Solution Approach 2:
The system uses feedback from amplification curve analysis to identify and differentiate target sequences. By comparing the shape, slope, and characteristic points of kinetic curves generated from fluorescence measurements at multiple time points, the system can distinguish between different targets amplified by the same probe
3Measurement precision
If real-time monitoring is implemented in digital PCR, then the precision of quantification is improved, but the device complexity increases
Solution Approach 1:
The real-time monitoring function is segmented into multiple independent detection units, each responsible for capturing fluorescence signals at specific time points. This distributes the complexity across multiple simple detection elements rather than requiring one complex continuous monitoring system
Solution Approach 2:
The system changes the measurement parameter from continuous fluorescence intensity to discrete temporal sampling points. By measuring fluorescence at specific predetermined cycles rather than continuously, the system achieves real-time kinetic information with simpler detection hardware
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
Enables accurate absolute quantification of nucleic acid strands, enhances the dynamic range of PCR detection, and allows for the detection of multiple target sequences using the same fluorescent probe, improving the discrimination of small fold-differences and providing valuable kinetic information.
Implementation Method 1
thermal cycle of each PCR mini-reactor is independently controlled by its respective temperature control element
Implementation Method 2
The temperature control element comprises a heating element
Implementation Method 3
a detection unit, wherein the detection unit can be programmed to take images at defined intervals
Data Source
AI summary
Disclosed are devices that can perform multiple independent digital PCRs with real-time monitoring capability. The device comprises multiple PCR mini-reactors thermally coupled with its own temperature control element, a detection unit, and a motor for moving the PCR mini-reactors or the detection unit. The real-time digital PCR device can simultaneously perform multiple digital PCRs, generate amplification curves of thousands and millions of individual PCR processes, evaluate binary readouts based on the kinetic properties of individual amplification curves, and identify different target sequences based on the amplification curves. Methods of using the real-time digital PCR device to detect target nucleic acids and count circulating tumor cells are also disclosed.