In Situ Nucleic Acid Synthesis via Enzymatic Ligation
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Solution Overview
Problem
Current methods for synthesizing oligonucleotides are inefficient, prone to errors, and require complex chemical reactions, leading to high costs and low fidelity in producing nucleic acids with predefined sequences.
Innovation Solution
A method involving the use of anchor oligonucleotides on a solid support, where partially double-stranded oligonucleotides with 5' overhangs are hybridized and ligated, followed by removal of unwanted nucleotides using enzymes like RNase or restriction endonucleases, allowing for rapid and inexpensive synthesis of nucleic acids with predefined sequences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional chemical synthesis methods are used for oligonucleotide production, then synthesis can be performed with established protocols, but the process becomes inefficient, error-prone, and costly
Solution Approach 1:
The patent replaces traditional chemical synthesis mechanisms with a biological mechanism using DNA polymerase enzymes. The polymerase extends anchor oligonucleotides through template-directed synthesis, eliminating the need for complex chemical reagents and multiple protection/deprotection steps. This biological substitution achieves higher efficiency and fidelity by leveraging the natural accuracy and speed of enzymatic DNA synthesis.
Solution Approach 2:
The invention changes the fundamental parameters of the synthesis process by using isothermal conditions instead of the temperature cycling required in PCR-based methods. The polymerase reaction proceeds at a constant temperature, simplifying the process control and improving reliability. Additionally, the method changes the reaction environment from chemical to biological parameters, using aqueous buffers and physiological conditions rather than organic solvents and extreme pH values.
2Manufacturing precision
If complex chemical reactions are employed for nucleic acid synthesis, then predefined sequences can be produced, but the cost increases and errors are more frequent
Solution Approach 1:
The patent replaces complex chemical reaction mechanisms with a simple enzymatic process. DNA polymerase naturally ensures high sequence accuracy through its proofreading capabilities and template-directed synthesis mechanism. The ease of manufacture is improved because the enzymatic reaction requires only standard laboratory conditions and common reagents, eliminating the need for specialized chemical synthesis equipment and expertise.
Solution Approach 2:
The DNA polymerase enzyme performs self-correction and quality control during synthesis. Its inherent proofreading function automatically detects and corrects mismatched nucleotides, ensuring high sequence accuracy without requiring additional verification steps. The enzyme self-regulates the synthesis process, adding nucleotides only when they correctly match the template sequence, thereby maintaining manufacturing precision while simplifying the overall process.
3Productivity
If traditional oligonucleotide synthesis methods are used, then production can proceed with existing technology, but the process is time-consuming and expensive
Solution Approach 1:
The patent replaces slow, multi-step chemical synthesis with rapid enzymatic synthesis. DNA polymerase can add nucleotides at rates of hundreds per second, completing synthesis in minutes rather than hours or days. The enzymatic process eliminates time-consuming steps such as repeated washing, deprotection, and purification cycles required in chemical methods, dramatically reducing synthesis duration while maintaining high productivity.
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 enables high-fidelity, rapid, and cost-effective synthesis of nucleic acids, reducing errors and increasing the density and accuracy of oligonucleotide arrays, facilitating efficient nucleic acid synthesis.
Implementation Method 1
hybridizing a partially double-stranded first oligonucleotide to the anchor oligonucleotide
Implementation Method 2
ligating the first oligonucleotide to the anchor oligonucleotide thereby generating a first ligation product
Implementation Method 3
removing unwanted nucleotides from the first ligation product thereby generating a first elongated product comprising the predetermined terminal nucleotide
Data Source
AI summary
Disclosed are compositions, methods and devices for the in situ synthesis of nucleic acids. In an exemplary embodiment, a support-bound oligonucleotide is elongated by addition of one or more nucleotides by hybridization of a partially double-stranded oligonucleotide, ligation and removal of unwanted nucleotides.