Nucleic Acid Detection via Indirect Probe Hybridization
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Solution Overview
Problem
Current methods for detecting circulating tumor cells (CTCs) in peripheral blood face challenges due to low concentrations, high false positive rates, and limited sensitivity, particularly in identifying rare cells and quantifying tumor-specific mRNA expression at a single cell level.
Innovation Solution
The method involves using label probes and capture probes to detect multiple nucleic acid targets in individual cells, allowing for the simultaneous detection and quantification of nucleic acids, such as mRNA, in single cells through hybridization and signal amplification techniques, enabling the identification of rare cells like CTCs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If immunomagnetic separation technology is used to detect CTC, then sensitivity is improved, but false positive rate increases due to non-specific binding of antibodies
Solution Approach 1:
The patent introduces a two-probe system where capture probes and label probes act as intermediaries. The capture probe binds to the target nucleic acid, and the label probe binds to the capture probe, creating an indirect detection mechanism. This intermediary approach reduces non-specific binding compared to direct antibody-antigen interaction, thereby reducing false positives while maintaining sensitivity.
Solution Approach 2:
The patent detects nucleic acid copies (mRNA transcripts) rather than directly detecting the tumor cell or protein markers. By amplifying and detecting nucleic acid copies through hybridization, the method achieves high sensitivity while the specificity of nucleic acid binding reduces false positives compared to protein-based methods.
2Measurement precision
If QPCR is used to detect tumor-specific mRNA, then detection capability is improved, but procedural complexity increases due to mRNA isolation and reverse transcription
Solution Approach 1:
The patent extracts and detects only the specific nucleic acid sequences of interest using capture probes with high specificity. By designing probes that target unique tumor-specific mRNA sequences, the method eliminates the need for complex mRNA isolation and reverse transcription steps required by QPCR, simplifying the procedure while maintaining detection capability.
Solution Approach 2:
The patent replaces the complex enzymatic procedures of mRNA isolation and reverse transcription with a simpler hybridization-based detection system. The mechanical/chemical process of nucleic acid hybridization substitutes for the multi-step biochemical procedures of QPCR, reducing procedural complexity.
3Measurement precision
If antibodies are used for CTC detection, then sensitivity is improved, but signal to noise ratio decreases due to non-specific binding
Solution Approach 1:
The patent uses capture probes as intermediaries between the target nucleic acid and the detectable label. This indirect binding mechanism through hybridization is more specific than antibody-antigen binding, reducing non-specific background signals and improving the signal-to-noise ratio while maintaining detection sensitivity.
Solution Approach 2:
The patent changes the detection parameter from protein-based (antibody binding) to nucleic acid-based (hybridization). Nucleic acid hybridization has higher specificity due to the precise base-pairing requirements, which reduces non-specific binding and improves signal-to-noise ratio compared to antibody-based methods.
4Reliability
If single cell nucleic acid detection is performed, then specificity is improved, but detection difficulty increases due to low concentration of target
Solution Approach 1:
The patent combines multiple detection functions into a single hybridization assay. The capture probe and label probe work together in one detection step to provide both specificity (through target binding) and detectability (through the label), eliminating the need for separate amplification and detection steps and reducing overall detection difficulty.
Solution Approach 2:
The patent detects multiple copies of the target nucleic acid sequence within each cell through hybridization. By designing probes that bind to conserved regions of the target sequence, the method amplifies the signal from each target molecule, making detection feasible even at low concentrations while maintaining single-cell specificity.
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 enhances the sensitivity and specificity of CTC detection, allowing for accurate enumeration and characterization of rare cells, improving clinical diagnostics by providing detailed mRNA expression profiles and reducing false positives.
Implementation Method 1
a first capture probe capable of hybridizing to the first target nucleic acid
Implementation Method 2
a first label probe comprising a first label... The first label probe is captured to the first capture probe
Data Source
AI summary
Methods of detecting multiple nucleic acid targets in single cells through indirect capture of labels to nucleic acid are provided. Methods of assaying the relative levels of nucleic acid targets through normalization to levels of reference nucleic acids are also provided. Methods of detecting individual cells, particularly rare cells from large heterogeneous cell populations through detection of nucleic acids are described. Related compositions, systems, and kits are also provided.