Universal RT Primer Design for miRNA Detection
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Solution Overview
Problem
Current methods for miRNA detection and quantification using qRT-PCR face challenges in achieving high specificity and sensitivity while maintaining cost-effectiveness and ease of use, particularly with linear universal RT primers, which often require additional modifications.
Innovation Solution
A nucleotide sequence and universal reverse primer design that includes a specific sequence formula (R−(dT)nVN) for cDNA synthesis, where R is a nucleotide sequence at the 5′ end, (dT)n is 19 continuous thymine residues, and VN includes adenine, guanine, or cytosine residues, enhancing primer specificity and sensitivity without the need for additional oligonucleotide modifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a linear universal RT primer is used for miRNA detection, then cost is reduced and ease of use is improved, but specificity and sensitivity worsen
Solution Approach 1:
The patent applies local quality by introducing a specific nucleotide sequence structure (R-(dT)nVN formula) with distinct functional regions: the R region for miRNA binding, (dT)n for poly-A tail binding, and VN for universal primer binding. This localized functional differentiation within the primer structure enables high specificity without requiring complex modifications or additional probes, thus maintaining cost-effectiveness while improving measurement precision.
2Measurement precision
If a stem-loop RT primer is used for miRNA detection, then specificity is improved, but cost increases due to required probes
Solution Approach 1:
The patent merges the functions of the reverse transcription primer and the universal PCR primer into a single universal RT primer structure (R-(dT)nVN). This consolidation eliminates the need for separate probes or additional primers, achieving both high specificity (comparable to stem-loop primers) and cost reduction (comparable to linear primers) by combining multiple functional elements into one oligonucleotide.
3Ease of operation
If current commercial universal RT primers are used, then ease of use is maintained, but additional modifications are required to improve specificity
Solution Approach 1:
The patent incorporates the universal primer binding sequence (VN) directly into the design of the RT primer itself, rather than requiring post-synthesis modifications. This preliminary integration of the universal binding site into the original primer structure allows users to directly use the modified primer without additional enzymatic reactions or chemical modifications, maintaining ease of operation while achieving improved specificity.
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 proposed solution improves the specificity and sensitivity of miRNA detection and quantification, reduces costs, and simplifies the process, allowing for effective miRNA analysis with reduced experimental complexity and variation.
Implementation Method 1
perform cDNA synthesis on a miRNA sample to be tested, wherein the universal RT primer is a nucleotide sequence represented by the following general formula: R−(dT)nVN
Implementation Method 2
a universal reverse primer having SEQ ID NO:2 to perform cDNA molecule amplification with a forward primer in miRNA qPCR detection
Data Source
AI summary
A nucleotide sequence having SEQ ID NO:1, a universal reverse primer having SEQ ID NO:2, and a universal RT primer are provided. In the miRNA detection method, the universal RT primer is used for the cDNA synthesis of a miRNA sample and the universal reverse primer is used for cDNA molecule amplification in qPCR quantitative detection. The universal reverse primer sequence, the nucleotide sequence, and the design rules are used in the method for designing primer, so as to design a primer for qPCR quantitative detection.