DNA-Stabilized Metal Cluster Sensor for Label-Free Polynucleotide Detection
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Solution Overview
Problem
Current methods for detecting and quantifying polynucleotides, such as RTD-PCR/qPCR, require specialized equipment and trained operators, are time-consuming, and are not suitable for rapid, cost-effective, or user-friendly applications outside a laboratory setting.
Innovation Solution
A DNA-stabilized metal cluster-based nucleic acid-sensor comprising a template nucleotide sequence for silver quantum cluster formation, a target-recognition nucleotide sequence, and a nucleotide sequence for intra-molecular hybridization, which forms a stem-loop structure and measures fluorescence intensity shifts upon target recognition, enabling label- and amplification-free detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If RTD-PCR/qPCR methods are used for polynucleotide detection, then measurement precision is improved, but device complexity and ease of operation deteriorate due to specialized equipment and trained operators being required
Solution Approach 1:
The patent replaces complex mechanical/electronic PCR equipment with a simple optical detection system based on fluorescence spectroscopy. The DNA-stabilized metal clusters serve as intrinsic fluorescent labels that can be detected using basic fluorometry equipment, eliminating the need for specialized real-time PCR instruments while maintaining detection precision through the unique spectral properties of the clusters.
Solution Approach 2:
The invention uses DNA-stabilized metal clusters as disposable fluorescent probes that can be synthesized inexpensively and used for single-use detection. These clusters replace expensive, complex reagents and consumables required by RTD-PCR/qPCR, enabling cost-effective detection without specialized equipment.
2Measurement precision
If RTD-PCR/qPCR methods are used for polynucleotide detection, then measurement precision is improved, but loss of time increases due to time-consuming procedures
Solution Approach 1:
The DNA-stabilized metal clusters are pre-synthesized with defined fluorescent properties and structural characteristics before use. This preliminary preparation allows the detection assay itself to proceed rapidly without time-consuming amplification cycles, as the clusters are already optimized for their detection function and can directly hybridize with target sequences.
Solution Approach 2:
The invention skips the time-consuming thermal cycling and amplification steps of RTD-PCR/qPCR by using direct hybridization of the fluorescent clusters with target polynucleotides. The method rushes through the detection process by relying on the high sensitivity of the metal cluster fluorescence signal, which can detect targets without requiring multiple amplification cycles.
3Ease of operation
If DNA-stabilized metal cluster sensor is used, then ease of operation and productivity are improved for rapid detection, but measurement precision may deteriorate compared to established PCR methods
Solution Approach 1:
The DNA-stabilized metal clusters exhibit distinct color changes and fluorescence intensity variations upon hybridization with target polynucleotides. These visible spectral changes provide intuitive, easy-to-interpret results that improve ease of operation while maintaining precision through the characteristic optical signatures of the clusters, which can be quantitatively measured to ensure accurate detection.
4Measurement precision
If complex laboratory equipment is used for polynucleotide detection, then measurement precision is improved, but ease of operation deteriorates requiring trained operators
Solution Approach 1:
The patent replaces complex laboratory instrumentation with simple optical detection based on fluorescence spectroscopy. The DNA-stabilized metal clusters produce distinct spectral signals that can be measured using basic fluorometers or even spectroscopic devices, eliminating the need for specialized PCR equipment and reducing operator training requirements while maintaining detection accuracy through objective spectral analysis.
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
The sensor provides sensitive and specific detection of polynucleotides with a simple, rapid, and cost-effective method, allowing for use outside a laboratory environment and enabling Point-of-Care testing with high accuracy and reliability.
Implementation Method 1
measures fluorescence intensity shifts upon target recognition
Data Source
AI summary
The present invention pertains to a DNA-stabilized metal cluster-based nucleic acid-sensor which allows quantitative and qualitative detection of oligo- or polynucleotides by measuring a shift in fluorescence intensity between distinct emission wavelengths triggered by target recognition. The invention further pertains to method for detecting a target polynucleotide with a nucleic acid-sensor according to the present invention.