Programmable Oligonucleotide Microarray Evanescent Wave Detection
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Solution Overview
Problem
Current real-time PCR methods face challenges in simultaneously and accurately quantifying multiple target nucleic acids from pathogens due to limitations in detection sensitivity and specificity, particularly in distinguishing between different nucleic acid sequences.
Innovation Solution
The implementation of evanescent wave detection in a microarrayed PCR process, where fluorescently tagged primers and amplicons are used, and target nucleic acid probes with specific hybridization temperatures are arrayed on a substrate, allowing for real-time, simultaneous measurement of multiple target nucleic acids by controlling hybridization temperatures and using evanescent waves to activate fluorescent signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional real-time PCR methods are used to quantify multiple target nucleic acids, then the detection process becomes complex and time-consuming, but the detection sensitivity and specificity are insufficient to accurately distinguish between different nucleic acid sequences
Solution Approach 1:
The detection system is segmented into multiple independent probe groups, each targeting specific nucleic acid sequences. Each probe is designed with unique hybridization temperature characteristics, allowing simultaneous detection of multiple targets through temperature-based differentiation. This segmentation enables high-specificity detection while maintaining manageable system complexity through modular probe design.
Solution Approach 2:
The invention adds a temperature dimension to the detection process by utilizing probes with different hybridization temperatures. Instead of relying solely on sequence-specific binding, the system uses temperature as an additional discrimination parameter. This dimensional approach allows multiple targets to be distinguished simultaneously based on their unique thermal response characteristics, enhancing measurement precision without proportionally increasing device complexity.
2Measurement precision
If multiple target nucleic acids are quantified simultaneously using traditional PCR, then the quantification accuracy decreases, but performing separate PCR reactions for each target increases the detection time and reduces productivity
Solution Approach 1:
The invention merges multiple detection functions into a single PCR reaction system. Multiple probe groups with different hybridization temperatures are combined in one reaction mixture, allowing simultaneous quantification of multiple target nucleic acids in a single tube. This merging approach maintains quantification accuracy through temperature-resolved detection while dramatically improving productivity by eliminating the need for separate reactions for each target.
Solution Approach 2:
The system utilizes parameter changes in hybridization temperature to achieve selective detection of different targets. By programming temperature transitions through specific ranges, the system can sequentially or simultaneously detect multiple targets based on their unique thermal response. This parameter-based differentiation maintains accurate quantification while enabling high-throughput detection of multiple nucleic acid sequences in parallel.
3Measurement precision
If fluorogenic probes with complementary sequences are used to detect target DNA, then the detection specificity improves, but the ability to simultaneously differentiate multiple targets with similar sequences is limited
Solution Approach 1:
The invention applies local quality differentiation by designing probes with specific hybridization temperature characteristics tailored to each target. Each probe group possesses unique local properties in terms of thermal stability and binding affinity. This localized optimization allows highly specific detection of individual targets while the collective set of probes provides versatile capability to differentiate multiple targets with similar sequences through their distinct thermal response patterns.
Solution Approach 2:
The detection system employs dynamic temperature control to enhance target differentiation. By dynamically adjusting the hybridization temperature through programmed transitions, the system can selectively favor binding of different probe groups to their complementary targets. This dynamic approach transforms a static detection limitation into an active discrimination mechanism, enabling simultaneous differentiation of multiple targets with similar sequences based on their unique thermal behavior during the detection process.
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 detection limit and specificity, enabling accurate, real-time quantification of target nucleic acids, improving the ability to differentiate between various pathogens and increasing the efficiency of nucleic acid detection.
Implementation Method 1
using evanescent waves to activate fluorescent signals
Implementation Method 2
When the attached probe is illuminated with the appropriate wavelength of light, the fluorescent molecule emits fluorescent light
Implementation Method 3
An unattached, folded probe has a fluorescing and a quenching molecule adjacent to each other, and consequently no fluorescent light is emitted when the unattached probe is illuminated
Implementation Method 4
target nucleic acid probes with specific hybridization temperatures are arrayed on a substrate, allowing for real-time, simultaneous measurement of multiple target nucleic acids by controlling hybridization temperatures
Data Source
AI summary
A programmable probe design of DNA micro array and detection methodology is provided. DNA probes, which are complemented with the target DNA, are designed and classified into groups according to optimum hybridization temperature. The probes are arrayed by the group and immobilized on the substrate surface of the DNA micro array. The control system, imaging system and temperature control system are programmed to cooperate with each other during the detection process. This design increases the detection capabilities of the parallel-analysis system.