Homogeneous PCR Detection Using Fluorescent Binding Agents
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Solution Overview
Problem
Current methods for detecting PCR products are prone to false results due to unspecific changes in fluorescence intensity, often requiring real-time monitoring, negative control reactions, or a second fluorescent indicator, which limits multiplexing capabilities and increases background noise.
Innovation Solution
A homogeneous detection method that uses a target binding agent capable of assuming different positions based on binding to a target polynucleotide, with signal intensity measured at specific conditions to determine the presence of the target polynucleotide without real-time monitoring or a second fluorescent indicator, allowing for accurate detection without washing steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If real-time monitoring or negative control reactions are used to improve detection accuracy, then measurement precision is improved, but device complexity and operational complexity increase
Solution Approach 1:
The patent extracts and eliminates the need for real-time monitoring and negative control reactions by using a homogeneous detection method with a single fluorescent indicator. The detection is performed at the end point using a simplified protocol that measures fluorescence intensity changes caused by probe binding to the target polynucleotide, thereby reducing methodological complexity while maintaining accuracy.
Solution Approach 2:
The patent employs a universal detection approach where a single fluorescent probe serves multiple functions: it binds to the target polynucleotide, generates a measurable fluorescent signal, and enables detection without requiring separate control reactions or real-time monitoring. This multi-functional probe simplifies the overall detection system.
2Measurement precision
If a second fluorescent indicator is used to reduce background noise, then measurement precision is improved, but adaptability and multiplexing capabilities deteriorate
Solution Approach 1:
The patent optimizes the fluorescent signal parameters by using a single fluorescent indicator with appropriate wavelength selection and signal amplification strategies. The detection relies on measuring fluorescence intensity changes (ΔF) caused by probe binding, which provides sufficient signal-to-noise ratio without requiring a second indicator, thereby preserving multiplexing capability.
3Ease of operation
If homogeneous detection without washing steps is used, then ease of operation is improved, but measurement precision may deteriorate due to background noise
Solution Approach 1:
The patent employs a self-service detection system where the fluorescent probe automatically binds to the target polynucleotide and generates a measurable signal without requiring external washing steps or complex processing. The homogeneous detection format allows the reaction mixture to serve its own detection function, simplifying the protocol while maintaining precision through optimized signal measurement.
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 method provides reliable and accurate detection of PCR products by minimizing false positives and enabling the detection of multiple targets in a single reaction, improving sensitivity and reducing background noise, thus offering a more robust alternative to existing techniques.
Implementation Method 1
a target binding agent capable of assuming a first position where the target binding agent is not bound to the target polynucleotide and a second position where the target binding agent is bound to the target polynucleotide
Implementation Method 2
a signal is measurable from the mixture, the intensity of the signal depending on the proportions of target binding agent being in the first and second positions
Data Source
AI summary
A method for detecting the presence of a target polynucleotide in a sample, including providing a mixture of the sample and target binding agent and measuring a signal from the mixture, where the target binding agent is capable of assuming a first position where the target binding agent is not bound to the target polynucleotide and a second position where the target binding agent is bound to the target polynucleotide, and the intensity of the signal depends on the proportion of target binding agent in the first and second positions. The method is suitable for detecting a PCR product using a homogeneous detection method.