Enzymatic Nucleic Acid Synthesis Without 3′-Blocked Nucleotides
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Solution Overview
Problem
Current chemical oligonucleotide synthesis methods are costly, limited to short nucleic acid strands, and require complex equipment, failing to meet the demand for rapid and inexpensive synthesis of long nucleic acids, while enzymatic oligonucleotide synthesis faces challenges with 3′-blocked nucleotides that are inefficient and complex.
Innovation Solution
A novel enzymatic route using unblocked nucleoside triphosphates with DNA polymerases that add a single nucleotide to the 3′ end of oligonucleotides without translocating, allowing for efficient and controlled nucleic acid synthesis without the need for 3′-blocked nucleotides, reducing costs and process complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If chemical oligonucleotide synthesis (COS) is used to produce synthetic DNA, then nucleic acid strands can be synthesized, but the synthesis is limited to short strands (up to around 200 nucleotides) and requires large, centralized facilities with sophisticated equipment
Solution Approach 1:
The patent replaces the mechanical/chemical synthesis system (COS requiring sophisticated equipment and facilities) with a biological enzymatic system (EOS using terminal deoxynucleotidyl transferases) that can synthesize much longer nucleic acid strands without requiring complex centralized facilities
Solution Approach 2:
The patent changes the fundamental parameters of the synthesis system by switching from chemical oligonucleotide synthesis to enzymatic oligonucleotide synthesis, enabling production of nucleic acid strands exceeding 200 nucleotides while reducing facility complexity requirements
2Manufacturing precision
If 3′-blocked nucleotides are used in enzymatic oligonucleotide synthesis to control nucleotide addition, then single nucleotide addition can be achieved, but the process becomes more complex and incorporation efficiency decreases
Solution Approach 1:
The patent extracts and removes the 3′ blocking group chemistry from the enzymatic synthesis process, replacing it with a system that uses unblocked nucleotides and relies on enzyme processivity control mechanisms, thereby simplifying the overall synthesis process while maintaining precision
Solution Approach 2:
Instead of using blocked nucleotides that require deblocking steps, the patent inverts the approach by using unblocked nucleotides with controlled enzyme processivity, eliminating the need for chemical blocking and deblocking operations
3Manufacturing precision
If 3′-blocked nucleotides are used in enzymatic oligonucleotide synthesis, then single nucleotide addition per cycle can be controlled, but the deblocking step adds chemical reaction complexity and may require expensive and toxic chemicals
Solution Approach 1:
The patent converts the potential harm of using blocked nucleotides (which require toxic deblocking chemicals) into a benefit by using unblocked nucleotides with controlled enzyme processivity, thereby eliminating the need for harmful deblocking chemicals while maintaining precise nucleotide addition control
4Productivity
If chemical oligonucleotide synthesis is used to meet rising demand for synthetic DNA, then production can be scaled, but costs have only improved by 20× over the last quarter century and do not keep up with demand
Solution Approach 1:
The patent replaces the costly chemical synthesis system with an enzymatic system that uses naturally occurring terminal deoxynucleotidyl transferases, enabling more cost-effective production of synthetic DNA that can keep pace with rising demand
Solution Approach 2:
The patent changes the fundamental parameters of DNA production by transitioning from chemical to enzymatic synthesis, achieving cost reductions of 10-100 fold while simultaneously increasing productivity to meet rising demand for synthetic nucleic acids
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 cost-effective and efficient synthesis of long nucleic acids, potentially reducing synthesis costs by 10-100 times and simplifying the synthesis process, while allowing for precise control over nucleotide addition.
Implementation Method 1
template-independent nucleic acid polymerases (TINAPs) that add a single nucleotide to a 3′ end of a nucleic acid without translocating
Data Source
AI summary
The present disclosure describes compositions and methods useful for the template independent enzymatic synthesis of nucleic acids.