Competitive Probe Design for Accurate SNP Detection
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Solution Overview
Problem
Current methods for detecting target base sequences, particularly those with single nucleotide polymorphisms (SNPs), face challenges in accurately distinguishing between perfectly matched and single base mismatched sequences due to experimental conditions and noise factors like salt concentration, leading to potential erroneous determinations.
Innovation Solution
A detection system using a fluorescent-labeled detection probe and a competitive probe is employed, where the competitive probe inhibits single base mismatch hybridization, allowing for clear discrimination by preventing quenching or emission peaks at lower temperatures, and first-order differentiation of temperature-fluorescence intensity curves is used to determine the presence of the target base sequence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a detection probe is used to detect target base sequences based on Tm value differences, then SNP detection capability is provided, but measurement precision deteriorates due to noise from salt concentration and experimental conditions
Solution Approach 1:
A competitive probe is introduced as an intermediary element that specifically binds to single base mismatched sequences. This competitive probe acts as a mediator that enhances the discrimination capability by creating a competitive binding scenario: the detection probe competes with the competitive probe for binding to the target sequence. When a single base mismatch is present, the competitive probe preferentially binds, preventing detection probe binding and eliminating the false positive signal. This resolves the contradiction by adding an intermediary element that improves measurement precision without sacrificing SNP detection capability.
Solution Approach 2:
The invention changes the binding parameters by using a competitive probe with specific sequence characteristics that give it higher affinity for mismatched sequences compared to the detection probe. By carefully designing the competitive probe's sequence complementarity and binding characteristics, the system transforms the temperature-dependent Tm value measurement into a competition-based detection method. This parameter change allows discrimination based on binding competition rather than solely on Tm differences, thereby improving measurement precision while maintaining adaptability.
2Adaptability or versatility
If Tm value-based discrimination is used to identify single base differences, then SNP detection is enabled, but reliability deteriorates due to erroneous determinations from experimental noise
Solution Approach 1:
The competitive probe serves as a reliable intermediary that specifically recognizes and binds to single base mismatched sequences. By introducing this intermediary element, the system achieves more reliable discrimination because the competitive probe's binding is less susceptible to experimental noise and salt concentration variations. The competitive binding mechanism creates a more robust signal that reliably indicates the presence of single base differences, thereby improving reliability while maintaining the ability to identify single base differences.
Solution Approach 2:
The system implements a feedback mechanism where the competitive probe's binding behavior provides information about the presence of single base mismatches. When the competitive probe binds to a mismatched sequence, it prevents detection probe binding, creating a negative feedback signal that reliably indicates a mismatch. This feedback mechanism improves reliability by providing a clear, noise-resistant signal that accurately reflects the presence or absence of single base differences under varying experimental conditions.
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 method enables robust and accurate detection of target base sequences by eliminating noise-related errors, allowing for precise identification without reliance on Tm value differences, thus improving the reliability of SNP detection.
Implementation Method 1
a detection probe having a base sequence complementary to the base sequence of a detection target to hybridize therewith
Implementation Method 2
a competitive probe that is allowed to hybridize with a non-target base sequence (B)
Implementation Method 3
measuring a fluorescence intensity while changing the temperature of the reaction sample
Data Source
AI summary
Methods for designing and producing a fluorescent-labeled detection probe and a competitive probe combination are provided to improve detection by reducing noise. A method for designing the fluorescent-labeled detection probe and a competitive probe combination includes, for example, determining the base length and the base sequence of each of the fluorescent-labeled detection probe and the competitive probe. The determining can include experimentally determining the amount to be added to the nucleic acid sample of each of the fluorescent-labeled detection probe and the competitive probe. The methods provide a functional result of a first order derivative curve for the control target reaction sample having a substantial peak (maximum value), but a first order derivative curve for the control non-target reaction sample not having a substantial peak, the functional result improving detection by reducing noise.