Methylation-Specific Fluorescence Primer Set for P16 Gene Detection
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Solution Overview
Problem
Current methylation-specific fluorescence assays for detecting methylation of CpG islands in the p16 gene have low sensitivity, specificity, and accuracy, making them unsuitable for developing diagnostic kits.
Innovation Solution
A primer set comprising specific oligonucleotide primers and a fluorescence-labeled probe designed for the methylation-specific fluorescence assay, with sequences as shown in SEQ ID NO.1 to SEQ ID NO.8, which are based on the nucleotide sequences of the sense-strand or complementary antisense-strand of the methylated CpG islands of the p16 gene after sodium bisulfite modification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the 70 bp-MethyLight fluorescence method is used, then the sensitivity is improved (84.1%), but the specificity deteriorates (34.5%) and accuracy remains low (18.6%)
Solution Approach 1:
The patent divides the detection system into multiple specialized components: methylation-specific primers that target only methylated sequences, fluorescence-labeled probes for specific sequence recognition, and differential detection for methylated versus unmethylated forms. This segmentation allows simultaneous improvement of sensitivity through specific targeting and specificity through multiple validation mechanisms.
Solution Approach 2:
The patent changes the detection parameters by using fluorescence-labeled probes with specific emission wavelengths and optimizing the methylation-specific PCR conditions. The use of fluorescent labels with different spectral properties enables differentiation between methylated and unmethylated sequences, improving both sensitivity and specificity through parameter optimization.
2Reliability
If the 150 bp-MSP method is used as gold standard, then the qualitative detection is achieved, but the quantitative determination capability is insufficient for diagnostic kit development
Solution Approach 1:
The patent merges the qualitative detection capability of MSP with quantitative fluorescence detection. The fluorescence-labeled probes enable real-time quantification during PCR amplification, combining the specificity of methylation-specific primers with the quantitative power of fluorescence measurement, thus achieving both qualitative and quantitative detection in a single assay.
Solution Approach 2:
The patent replaces the traditional gel electrophoresis-based qualitative detection with fluorescence-based real-time quantitative detection. The fluorescence signal intensity directly correlates with the amount of methylated DNA, providing quantitative determination capability while maintaining the specificity of methylation detection.
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 primer set achieves high sensitivity, specificity, and accuracy, significantly improving the detection of methylation in CpG islands, with results showing a higher risk of malignant transformation of oral epithelial dysplasia lesions, meeting the requirements for diagnostic kit development.
Implementation Method 1
fluorescence-labeled probe has base sequence as shown in SEQ ID NO. 3 or SEQ ID NO.4
Data Source
AI summary
The invention provides a primer group for detecting CpG island methylation of p16 gene using methylation specific fluorescence technique. The primer group comprises a pair of oligonucleotide primers and a fluorescence-labeled probe. Said oligonucleotide primer pair has base sequence represented by SEQ ID NO.1 and SEQ ID NO.2. Said fluorescence-labeled probe has base sequence represented by SEQ ID NO.3 or SEQ NO.4.