Dual Specificity Oligonucleotide for PCR Mismatch Tolerance
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Solution Overview
Problem
Conventional oligonucleotides used in PCR and hybridization processes face challenges with non-specificity, leading to false positives, poor reproducibility, and high backgrounds due to mismatch tolerance and instability of short oligomers, which limits their effectiveness in nucleic acid amplification and sequencing.
Innovation Solution
A dual specificity oligonucleotide with a 5′-high Tm specificity portion, a 3′-low Tm specificity portion, and a separation portion comprising universal bases, allowing for enhanced annealing specificity and mismatch tolerance by forming a non-base-pairing bubble structure, thereby improving the accuracy of nucleic acid amplification and hybridization reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional oligonucleotides are used in PCR and hybridization processes, then the processes can proceed, but non-specificity occurs leading to false positives, poor reproducibility, and high backgrounds
Solution Approach 1:
The oligonucleotide is divided into three distinct portions: a 5'-high Tm specificity portion, a separation portion with universal bases, and a 3'-low Tm specificity portion. This segmentation allows each portion to fulfill different functions - the 5' portion ensures high stringency binding, the separation portion provides flexibility through universal bases, and the 3' portion enables annealing at lower temperatures, collectively resolving non-specificity issues
Solution Approach 2:
Different portions of the oligonucleotide have different Tm values and specificities. The 5'-high Tm specificity portion provides high stringency at its location, while the 3'-low Tm specificity portion provides flexibility at its location. This local differentiation of properties allows the molecule to simultaneously achieve high specificity and tolerance for mismatches, eliminating false positives
2Device complexity
If short oligomers are used, then the process is simple, but mismatch tolerance and instability occur
Solution Approach 1:
The oligonucleotide is segmented into three functional portions with different Tm values. This segmentation allows the molecule to maintain stability through the high Tm 5' portion while the low Tm 3' portion provides flexibility for annealing, resolving the contradiction between simplicity and stability
Solution Approach 2:
The invention changes the Tm parameter distribution across different portions of the oligonucleotide. By creating a gradient where the 5' portion has high Tm and the 3' portion has low Tm, the molecule achieves both stability and flexibility without increasing overall complexity
3Reliability
If high annealing temperature is used, then specificity of primer annealing is improved, but mismatches between template and primer are not tolerated
Solution Approach 1:
The oligonucleotide is segmented into portions with different Tm values, allowing the 5'-high Tm specificity portion to ensure specific annealing at high temperatures while the 3'-low Tm specificity portion can tolerate mismatches. This segmentation resolves the contradiction between high stringency and mismatch tolerance
Solution Approach 2:
The 5' portion has high Tm and provides stringency for specific annealing, while the 3' portion has low Tm and provides flexibility for mismatch tolerance. This local differentiation of Tm properties allows simultaneous achievement of high specificity and adaptability
4Adaptability or versatility
If low annealing temperature is used, then mismatch tolerance is improved, but specificity of primer annealing decreases
Solution Approach 1:
The oligonucleotide is divided into portions with different Tm values, enabling the 5'-high Tm specificity portion to maintain specific annealing even at lower temperatures while the 3'-low Tm specificity portion provides mismatch tolerance. This segmentation resolves the contradiction between adaptability and reliability
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 dual specificity oligonucleotide significantly enhances the specificity of nucleic acid amplification and hybridization reactions, reducing non-specific products and improving the ability to amplify and sequence target nucleic acids with genetic diversity, while maintaining high stringency and mismatch tolerance.
Implementation Method 1
a 5'-high Tm specificity portion having a hybridizing nucleotide sequence substantially complementary to a site on a template nucleic acid to hybridize therewith
Data Source
AI summary
The present invention relates to various processes by a template-dependent extension reaction using a dual specificity oligonucleotide and a dual specificity oligonucleotide composed of three different Tm portions therefor. Demonstrated in the present invention are the features of the dual specificity oligonucleotide, which are high hybridization specificity and mismatch tolerance.