Nucleic Acid Probe Tm Adjustment for qPCR Variability
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Solution Overview
Problem
Current quantitative PCR (qPCR) methods face challenges due to instrument-to-instrument variability, insufficient quality control, particularly with PCR inhibitors, and high costs, which limit their suitability for diagnostics and require complex workflows and skilled labor, making them expensive and difficult to deploy widely.
Innovation Solution
A method that reduces the effect of hybridization probes on amplification by using probes with a melting temperature less than the PCR amplification temperatures, either by designing probes with mismatched bases or using chemical denaturants, allowing for more accurate and sensitive detection of nucleic acid targets while minimizing the impact of inhibitors and reducing reagent consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional qPCR methods are used with standard hybridization probes, then detection capability is achieved, but instrument-to-instrument variability and insufficient quality control limit diagnostic suitability
Solution Approach 1:
The patent applies parameter changes by modifying the probe melting temperature relative to PCR amplification temperature. Specifically, probes are designed with Tm values below the denaturation, annealing, and extension temperatures used in PCR cycles. This parameter adjustment reduces probe effects on amplification kinetics and minimizes instrument-to-instrument variability, thereby improving reliability for diagnostic applications.
2Reliability
If replicate measurements are used to control for false negative and positive results, then some quality control is achieved, but additional sample consumption is required
Solution Approach 1:
The patent resolves this contradiction by changing the probe temperature parameter to reduce probe effects on amplification. This allows for more reliable single-replicate measurements with improved quality control, eliminating the need for multiple replicates and thereby reducing sample consumption while maintaining or improving reliability.
3Quantity of substance
If low RNA yield from clinical samples is used, then sample availability is maintained, but the number of assays per test is limited
Solution Approach 1:
The patent applies parameter changes to probe design (lower Tm relative to PCR temperatures) that improve amplification efficiency and reduce reagent consumption. This enables more assays to be performed per test with the same low RNA yield from clinical samples, thereby increasing productivity without requiring additional sample input.
4Adaptability or versatility
If more tests are performed to increase diagnostic capability, then comprehensive analysis is achieved, but expensive reagents and complicated workflows increase cost and slow deployment
Solution Approach 1:
The patent resolves this contradiction by modifying probe temperature parameters to reduce probe effects on amplification. This improvement in amplification efficiency allows for more comprehensive diagnostic testing with reduced reagent consumption and simplified workflows, thereby increasing adaptability while decreasing complexity and cost.
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 of nucleic acid targets, improves analytical sensitivity, and simplifies workflows, making qPCR more deployable and cost-effective for clinical diagnostics by minimizing instrument variability and inhibitor interference.
Implementation Method 1
the nucleic acid probe hybridizes to the target nucleic acid molecule and has a probe: template melting temperature less than the denaturation temperature, the annealing temperature, and the extension temperature used in a polymerase chain reaction (PCR) amplification cycle
Implementation Method 2
polymerase chain reaction (PCR) amplification cycle
Implementation Method 3
the nucleic acid probe is fluorogenic. In various embodiments of any of the aspects delineated herein, fluorescence is used to generate a melting curve
Implementation Method 4
a chemical denaturant is used to increase the ΔTm between the annealing temperature and the probe Tm
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
The invention features compositions and methods that are useful for the measurement of the quantity of a nucleic acid target in a sample.