Cell-Free Enzymatic DNA Synthesis with Alternative Nucleotide Cations
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Solution Overview
Problem
Existing methods for large-scale DNA synthesis, such as chemical synthesis and cell-based processes, are inefficient, costly, and limited by the use of conventional nucleotide salts, leading to low yields and inaccuracies, while enzymatic methods face challenges in scaling up and maintaining high yields.
Innovation Solution
A cell-free enzymatic DNA synthesis process using nucleotide salts with monovalent cations having an ionic radius greater than sodium, reducing the need for divalent cations and buffering agents, allowing for high concentrations of nucleotides and enabling isothermal strand-displacement replication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If chemical synthesis methods are used for large-scale DNA production, then DNA can be produced in large quantities, but the yield is limited and the process is inefficient due to capping losses after each nucleotide addition
Solution Approach 1:
The patent changes the chemical parameters of the synthesis system by replacing conventional phosphoramidite chemistry with enzymatic polymerization using nucleotide salts containing alternative monovalent cations (K+, Rb+, Cs+, NH4+). This parameter change eliminates the capping step and enables continuous chain elongation, dramatically improving both productivity and yield to over 80% of theoretical maximum.
2Ease of manufacture
If conventional nucleotide salts (sodium or lithium) are used in enzymatic DNA synthesis, then the process is simple and well-established, but scaling up to large volumes results in disappointing yield
Solution Approach 1:
The patent modifies the ionic composition parameter by substituting sodium or lithium cations with alternative monovalent cations (potassium, rubidium, caesium, or ammonium) in the nucleotide salts. This parameter change resolves the contradiction by enabling high-yield enzymatic synthesis at large scales while maintaining process simplicity, achieving yields exceeding 80% of theoretical maximum.
3Quantity of substance
If cell-based processes are used for DNA amplification, then very large volumes of product can be produced, but the setup cost is high and cell-free environment is preferred for clinical purposes
Solution Approach 1:
The patent replaces the biological system (cell-based processes) with a cell-free enzymatic system. By substituting living cells with purified enzymes and optimized nucleotide salts, the invention achieves large-scale DNA production without the high setup costs and contamination risks associated with cell culture, while maintaining the ability to produce very large volumes.
4Productivity
If high concentrations of nucleotides are used in enzymatic synthesis, then productivity increases, but the requirement for divalent cations and buffering agents increases complexity
Solution Approach 1:
The patent changes the ionic environment parameters by using nucleotide salts with alternative monovalent cations that reduce the stringent requirements for divalent cations and buffering agents. This parameter change allows high concentrations of nucleotides to be used for increased productivity while actually simplifying the reaction mixture and reducing the need for additional components.
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 significantly enhances DNA yield and efficiency, achieving yields exceeding 80% of theoretical maximum, producing industrial quantities of high-fidelity DNA up to 30 g/l with reduced costs and minimal components.
Implementation Method 1
Enzymatic DNA synthesis generally requires the use of a polymerase or polymerase-like enzyme to catalyse the addition of nucleotides to a nascent nucleic acid chain
Implementation Method 2
due to the highly charged nature of nucleic acids, they are constantly surrounded by counter-ions to neutralise most of their charges to lessen the electrostatic repulsion between sections of sequence
Data Source
AI summary
The present invention relates to an improved process for synthesis of deoxyribonucleic acid (DNA), in particular cell-free enzymatic synthesis of DNA, preferably on a large scale, with an improved yield and/or with an improved efficiency. The species of cation present in the nucleotide salt as the counter-ion is critical to the yield, efficiency and fidelity of high yielding enzymatic DNA synthesis reaction. The processes herein use alternative cations as counter-ions for the ionic nucleotides, permitting the use of higher concentrations of nucleotides in DNA synthesis, and further allowing for more favourable reaction conditions to be used.