Multispectral qPCR Probe Architecture for Low-Copy Nucleic Acid Detection
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Solution Overview
Problem
Current molecular detection systems for nucleic acids, such as those used during the COVID-19 pandemic, suffer from low specificity and detection limits, leading to false positives and negatives, particularly in the ultra-low copy number range.
Innovation Solution
A multi-array and multispectral molecular detection system utilizing sets of primers and hydrolysis-based probes, combined with FRET-based noise cancellation and mathematical/algorithmic biconditional logical connectives analysis, for ultra-specific and ultra-sensitive detection of nucleic acids.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If standard molecular detection systems are used, then the detection process is simple, but the specificity and detection limits are low leading to false positives and negatives
Solution Approach 1:
The detection system is divided into multiple independent reaction mixtures, each containing specific primer sets and hydrolysis probes. Each reaction mixture targets specific nucleic acid sequences with dedicated fluorophore-quencher probe combinations, allowing parallel detection of multiple targets while maintaining high specificity for each individual detection channel.
Solution Approach 2:
The system transitions from single-channel detection to multi-spectral detection by utilizing multiple fluorophores with distinct emission wavelengths. This dimensional expansion in the spectral domain enables simultaneous detection of multiple nucleic acid targets with high specificity, as each fluorophore-channel combination provides an independent detection dimension.
2Reliability
If multiple reaction mixtures with multiple fluorophores are used, then detection sensitivity and specificity improve, but the device complexity increases
Solution Approach 1:
The system employs universal hydrolysis probe architecture where each probe consists of a fluorophore, quencher, and oligonucleotide sequence. This universal design allows the same basic probe structure to be replicated across multiple reaction mixtures with different fluorophore-labeling, enabling reliable detection across multiple channels while maintaining consistent performance characteristics.
Solution Approach 2:
The system incorporates control reaction mixtures that provide feedback on system performance and detectability. These control mixtures contain known nucleic acid sequences and fluorophore-probe combinations, allowing real-time monitoring of detection reliability and enabling adjustment of detection thresholds to maintain high reliability across varying experimental conditions.
3Measurement precision
If standard detection methods are used, then the procedure is straightforward, but false positives and negatives occur particularly in low copy number detection
Solution Approach 1:
The system utilizes multiple parameters including fluorophore emission wavelengths, quencher types, probe sequences, and amplification conditions to enhance detection accuracy. By varying these parameters across multiple reaction mixtures, the system achieves high detection accuracy for low copy number targets while maintaining a standardized operational workflow that preserves ease of execution.
Solution Approach 2:
The detection system employs composite probe structures combining fluorophores, quenchers, and oligonucleotide sequences in specific configurations. These composite materials provide enhanced detection accuracy through the synergistic interaction of fluorescent emission, quenching, and sequence-specific hybridization, while the modular nature of the composite probes maintains procedural simplicity through standardized preparation protocols.
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 system effectively eliminates false positives and negatives, achieving highly reliable detection of low copy numbers of nucleic acids with high precision and sensitivity.
Implementation Method 1
the first hydrolysis probe includes a first fluorophore and a quencher of the first fluorophore, wherein the second hydrolysis probe includes a second fluorophore and a quencher of the second fluorophore
Implementation Method 2
hydrolysis-based probes
Implementation Method 3
quantitative polymerase chain reaction (qPCR)
Data Source
AI summary
Methods according to aspects of the disclosure, compositions and kits therefore, include at least one, two, or three sets of amplification primers and hydrolysis probes with at least two separate corresponding readouts per set. According to aspects of the present disclosure, the at least two hydrolysis probes and associated pair of primers of each set are directed to opposite strands of an amplification product of the set. According to aspects of the present disclosure, one of the two hydrolysis probes in each set is directed to a first strand of the amplification product and therefore has a sequence complementary to the first strand of the amplification product and the second of the two hydrolysis probes in the set is directed to the second strand of the amplification product and therefore has a sequence complementary to the second strand of the amplification product.