Cell-Free Circular Nucleic Acid Amplification With High Purity
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Solution Overview
Problem
Current methods for producing synthetic nucleic acid molecules require non-mammalian cell systems, leading to impurities, difficulty in controlling fidelity and expression, and the need for expensive equipment.
Innovation Solution
A cell-free method for amplifying synthetic circular nucleic acids using endonucleases, ligases, and topoisomerases to produce highly pure and controlled amplification products, eliminating the need for cell-based systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If non-mammalian cell systems are used to produce synthetic nucleic acid molecules, then adequate quantities of synthetic NA molecules can be produced, but the resulting NA molecules contain impurities and require expensive equipment
Solution Approach 1:
The patent extracts the essential function of nucleic acid amplification from complex cell systems and implements it through a simplified cell-free enzymatic system. By removing the cell-based machinery and using only purified enzymes (DNA polymerase, ligase, topoisomerase), the method eliminates impurities while maintaining high产量的 capability.
Solution Approach 2:
The patent replaces the biological cell-based amplification system with a chemical/enzymatic system. Instead of relying on cellular replication machinery, the invention uses purified enzymes to perform DNA synthesis, ligation, and supercoiling, thereby eliminating cellular impurities and simplifying the production process.
2Quantity of substance
If non-mammalian cell systems are used to amplify nucleic acids, then production quantities are adequate, but it is difficult to control fidelity and expression
Solution Approach 1:
The patent incorporates multiple enzymatic steps with specific substrates and conditions that provide inherent feedback control. The DNA polymerase replicates only the template sequence, the ligase joins only complementary ends, and the topoisomerase introduces supercoils only in the final circular product, ensuring high fidelity at each stage.
Solution Approach 2:
The patent controls fidelity and expression by precisely controlling enzymatic reaction parameters such as temperature, pH, substrate concentration, and enzyme-to-substrate ratios. These parameter optimizations ensure that each enzymatic step proceeds with high specificity and produces the desired circular nucleic acid with controlled supercoiling.
3Quantity of substance
If cell-based methods are used for nucleic acid amplification, then adequate production is achieved, but expensive specialized equipment is required
Solution Approach 1:
The patent replaces expensive, complex cell culture equipment with simpler, more affordable laboratory equipment suitable for enzymatic reactions. The cell-free system can be performed in standard incubators and reaction vessels, eliminating the need for expensive bioreactors, cell culture facilities, and specialized purification equipment.
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 method provides cost-effective, high-fidelity amplification of synthetic nucleic acids with minimal impurities, enabling efficient and pure production of circular nucleic acids for therapeutic and research applications.
Implementation Method 1
contacting the amplification product with a first endonuclease under conditions for digestion, thereby producing a first digestion product
Implementation Method 2
adding the first digestion product to a ligation reaction mixture comprising a ligase enzyme; and incubating the ligation reaction mixture, thereby producing a circular ligation product
Implementation Method 3
contacting the circular ligation product with a topoisomerase under conditions that promote supercoiling, thereby producing a supercoiled product
Data Source
AI summary
The present disclosure relates to a process of cell-free circular nucleic acid amplification using rolling circle amplification.