Nucleic Acid Activation for Polymerase Reactions
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Solution Overview
Problem
Existing methods for activating nucleic acids, such as DNA, for strand displacement reactions suffer from DNA damage due to high temperatures and require additional steps like alkali denaturation, which complicates the reaction process.
Innovation Solution
A method involving heating nucleic acids to a moderate temperature of 55° C. to 80° C. followed by cooling to a temperature where polymerase activity is maintained, allowing for the initiation of strand displacement reactions without DNA damage and reducing procedural complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If high temperature denaturation at 95°C is used to separate DNA strands, then strand separation is achieved, but DNA damage occurs through depurination and strand breakage
Solution Approach 1:
The patent changes the temperature parameter from conventional 95°C denaturation to a lower range of 55-80°C, which achieves sufficient strand separation for the isothermal amplification reaction while avoiding the DNA damage associated with high temperature treatment. This parameter optimization resolves the contradiction between maintaining DNA integrity and achieving effective strand separation.
2Ease of operation
If alkali denaturation is used to separate DNA strands, then strand separation is achieved, but additional neutralization steps are required
Solution Approach 1:
The patent extracts the denaturation step from the conventional PCR protocol by using heat-labile polymerase that allows strand separation at lower temperatures without requiring alkali treatment. This eliminates the need for additional neutralization steps, reducing the overall complexity of the reaction procedure while maintaining effective strand separation.
Solution Approach 2:
The patent performs preliminary strand separation at 55-80°C before adding the heat-labile polymerase, creating conditions optimal for the subsequent isothermal amplification. This preliminary action at moderate temperature avoids the need for harsh chemical denaturation and its associated additional steps.
3Object-affected harmful factors
If heat-labile polymerase is used for isothermal amplification, then reaction can proceed at 55-80°C without DNA damage, but polymerase activity must be maintained throughout the reaction
Solution Approach 1:
The patent selects and optimizes the temperature parameter for isothermal amplification at 55-80°C, which is high enough to maintain strand separation and facilitate polymerase activity, but low enough to prevent heat-labile polymerase denaturation and DNA damage. This precise temperature control resolves the contradiction between maintaining polymerase activity and avoiding thermal degradation.
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 approach conserves DNA integrity and simplifies the reaction process by avoiding high-temperature denaturation and alkali treatment, ensuring comparable DNA yield and quality to traditional methods while reducing procedural steps.
Implementation Method 1
Heating a nucleic acid to a temperature of 55° C. to 80° C.
Implementation Method 2
Cooling the nucleic acid to a temperature at which a polymerase shows no substantial decrease in activity
Data Source
AI summary
The present invention concerns a method for activating a nucleic acid for a polymerase reaction with the steps: (a) Heating a nucleic acid to a temperature of 55° C. to 80° C., (b) cooling the nucleic acid to a temperature at which a polymerase shows no substantial decrease in activity, and (c) starting the polymerase reaction by the addition of a heat-labile polymerase to the nucleic acid.