Dual Hot Start PCR Mixture for Non-Specific Amplification Control
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Solution Overview
Problem
Current nucleic acid amplification techniques face challenges in reducing non-specific amplification and undesired amplification products, particularly due to mis-priming and primer-dimer formation, which lead to background fluorescence and contamination of PCR products.
Innovation Solution
A dual hot start reaction mixture is employed, comprising multiple mechanisms such as antibodies, oligonucleotides, and chemical modifications to inhibit DNA polymerase activity at lower temperatures, ensuring minimal non-specific amplification and product formation, even at ambient temperatures, and restoring activity at elevated temperatures for efficient amplification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If DNA polymerase is added to the reaction mixture at ambient temperature, then the reaction can proceed immediately, but non-specific amplification and primer-dimer formation occur due to polymerase activity at low temperatures
Solution Approach 1:
The patent applies preliminary action by pre-heating the reaction mixture to elevated temperature before adding the DNA polymerase. This ensures that when the polymerase is introduced, the temperature is already sufficient to prevent non-specific priming and primer-dimer formation, while still allowing the reaction to proceed efficiently without significant delay
Solution Approach 2:
The patent applies preliminary anti-action by using hot start antibodies or chemical modifiers that are pre-added to the reaction mixture in an inactive state. These agents prevent polymerase activity at ambient temperature through antibody binding or chemical modification, and are subsequently inactivated by heat treatment to allow normal polymerase function during amplification
2Object-generated harmful factors
If hot start techniques are used to inhibit polymerase activity at ambient temperature, then non-specific amplification is reduced, but the complexity of the reaction mixture increases due to additional components
Solution Approach 1:
The patent applies the taking out principle by separating the polymerase activity control function from the amplification function. Hot start antibodies or chemical modifiers are used to temporarily 'take out' or inhibit polymerase activity at ambient temperature, allowing non-specific amplification to be suppressed without requiring complex additional components in the final reaction mixture
Solution Approach 2:
The patent applies parameter changes by utilizing temperature as a control parameter to regulate polymerase activity. The polymerase is held in an inactive state at ambient temperature through antibody binding or chemical modification, and activity is restored by changing the temperature parameter through heat treatment, thereby simplifying the reaction mixture composition while maintaining control over non-specific amplification
3Object-generated harmful factors
If extended exposure to high temperature is used to fully activate the polymerase, then non-specific amplification is minimized, but permanent inactivation of some reaction components may occur
Solution Approach 1:
The patent applies preliminary action by performing a brief hot start treatment immediately before the amplification cycles begin. This short exposure to elevated temperature is sufficient to inactivate the hot start antibodies or chemical modifiers and activate the polymerase, minimizing the risk of permanent damage to temperature-sensitive reaction components while still preventing non-specific amplification during sample preparation
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 hot start reaction mixture significantly reduces non-specific amplification and product formation by 20-100% compared to single hot start mechanisms, maintaining polymerase activity at elevated temperatures while minimizing background fluorescence and contamination.
Implementation Method 1
a dual hot start reaction mixture that inhibits or substantially inhibits the polymerase activity of the nucleic acid polymerase at a first temperature (e.g., ambient temperature) and that does not substantially inhibit the polymerase activity of the nucleic acid polymerase at a second temperature (e.g., an elevated temperature sufficient to prevent non-specific primer annealing)
Implementation Method 2
restoring activity at elevated temperatures for efficient amplification
Implementation Method 3
a nucleic acid binding dye, for example, but not limited to, SYBR® Green I (Life Technologies, Carlsbad, CA), including certain real-time and/or end-point detection techniques
Data Source
AI summary
The present disclosure is directed to compositions, methods and kits for amplifying target nucleic acids while reducing non-specific amplification and undesired amplification products using a dual hot start reaction mixture that comprise at least two different hot start mechanisms.