ET SSB Protects LAMP Primers from Non-Specific Extension
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Solution Overview
Problem
High-throughput and diagnostic applications in molecular diagnostics face challenges due to variability and inefficiency in amplification reactions caused by non-specific primer extension and primer dimer formation during room temperature incubation of reaction mixtures before reaching the specified reaction temperature.
Innovation Solution
Incorporating an extreme thermophile single-strand binding protein (ET SSB) with thermostable polymerase and oligonucleotide primers in a reaction buffer, which inhibits primer extension at room temperature and enhances amplification efficiency when the reaction is performed at a higher temperature, thereby reducing variability and increasing the rate of loop-mediated isothermal amplification (LAMP).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If reaction mixtures are incubated at room temperature during preparation, then ease of operation is improved, but non-specific primer extension occurs causing false positives and reduced reliability
Solution Approach 1:
The invention changes the temperature parameter by introducing a thermostable polymerase that remains inactive at room temperature and only becomes active at elevated temperatures (e.g., 37°C or higher). This temperature-dependent activation prevents non-specific primer extension during room temperature preparation while enabling specific amplification when heated, thus resolving the contradiction between ease of operation and reliability
Solution Approach 2:
The invention introduces a temperature control intermediary (heating device or thermal cycler) that mediates between the room temperature preparation stage and the amplification stage. This intermediary ensures that the reaction mixture reaches the required activation temperature for the thermostable polymerase, preventing premature primer extension while maintaining ease of setup
2Ease of operation
If reaction mixtures are incubated at room temperature for extended periods, then ease of operation is improved, but primer dimer formation increases causing variability and reduced productivity
Solution Approach 1:
The invention changes the temperature parameter to suppress primer dimer formation during preparation. By using a thermostable polymerase that requires elevated temperatures for activation, primer dimers formed at room temperature do not undergo extension, preventing their accumulation and the associated variability that would reduce amplification productivity
3Ease of operation
If room temperature incubation is performed, then ease of operation is improved, but amplification efficiency decreases due to secondary structure formation
Solution Approach 1:
The invention changes the temperature parameter during the amplification phase by using a thermostable polymerase that operates optimally at elevated temperatures. This temperature increase melts secondary structures in primers and templates that formed during room temperature preparation, restoring the single-stranded conformation necessary for specific binding and efficient amplification, thus resolving the contradiction between preparation convenience and amplification efficiency
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 use of ET SSB protects primers from non-template extension, reducing reaction time to reach amplification threshold and minimizing variability, resulting in enhanced amplification efficiency and consistency, with a significant increase in the rate of LAMP reactions.
Implementation Method 1
Incorporating an extreme thermophile single-strand binding protein (ET SSB) with thermostable polymerase and oligonucleotide primers in a reaction buffer, which inhibits primer extension at room temperature
Implementation Method 2
the thermostable polymerase in the preparation has strand displacement activity and is active at temperatures of greater than 50° C.
Implementation Method 3
performing LAMP; and obtaining amplified template DNA
Data Source
AI summary
Compositions and methods are provided for loop mediated isothermal amplification in which single stranded binding proteins are shown to protect primers from non-specific extension and to stimulate the rate of threshold amplification.