One-Pot Oligonucleotide Synthesis Using Orthogonal Blocking Groups
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Solution Overview
Problem
Current oligonucleotide synthesis methods, such as the phosphoramidite method, require harsh conditions and environmentally hazardous reagents, making it difficult to produce oligonucleotides in situ for enzymatic processes like DNA amplification without cumbersome purification steps and delays.
Innovation Solution
Enzymatic synthesis of oligonucleotides in a single reaction vessel using template-independent DNA polymerases, such as terminal deoxynucleotidyl transferase (TdT), allowing for the direct production and use of oligonucleotides in amplification reactions like PCR without the need for base-deprotection and purification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If chemical synthesis methods (phosphoramidite method) are used, then oligonucleotides can be produced with controlled purity and concentration, but harsh conditions and hazardous reagents are required that preclude in situ production for enzymatic processes
Solution Approach 1:
The patent changes the fundamental parameters of the synthesis method from chemical (phosphoramidite) to enzymatic (terminal deoxynucleotidyl transferase), operating under physiological conditions rather than harsh chemical conditions. This allows the same oligonucleotide synthesis function to be performed with parameters compatible with enzymatic processes, enabling in situ production without compromising purity control.
Solution Approach 2:
The patent substitutes the mechanical/chemical synthesis system with a biological/enzymatic system. Instead of using chemical reagents and harsh conditions, the system employs terminal deoxynucleotidyl transferase enzyme to catalyze oligonucleotide synthesis, replacing the mechanical chemical synthesis process with a biological process that is inherently compatible with enzymatic applications.
2Quantity of substance
If chemical synthesis methods are used, then oligonucleotides can be produced, but cumbersome purification steps and delays are required before use in amplification
Solution Approach 1:
The patent merges the oligonucleotide synthesis step with the amplification reaction step by performing both operations in the same reaction vessel. The enzymatic synthesis produces oligonucleotides directly in the reaction medium, eliminating the need for separate purification and transfer steps. This consolidation of operations eliminates time losses associated with purification, drying, and shipment while maintaining adequate yield.
Solution Approach 2:
The patent performs preliminary oligonucleotide synthesis directly in the reaction vessel before the amplification reaction begins. By preparing the oligonucleotides in advance within the same vessel using enzymatic methods, the system eliminates the need for post-synthesis purification and external shipment, allowing immediate use in the amplification reaction without time loss.
3Ease of manufacture
If chemical synthesis methods are used, then oligonucleotides can be manufactured, but environmentally hazardous reagents are required that present handling and disposal issues
Solution Approach 1:
The patent replaces the chemical synthesis system with an enzymatic system, substituting hazardous chemical reagents with a biological enzyme (terminal deoxynucleotidyl transferase) that operates under physiological conditions. This substitution eliminates the need for environmentally hazardous reagents while maintaining ease of manufacture through a simpler, safer process that requires only standard enzymatic reaction conditions.
Solution Approach 2:
The patent converts the potentially harmful chemical synthesis process into a beneficial enzymatic process. By using terminal deoxynucleotidyl transferase to catalyze the synthesis, the system transforms a hazardous chemical procedure into a safe biological process that produces the same oligonucleotide products without generating harmful waste or requiring dangerous reagents, thereby benefiting both the environment and laboratory safety.
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
Enables efficient, in situ synthesis and use of oligonucleotides in amplification reactions, reducing time and material costs while avoiding hazardous reagents and purification delays.
Implementation Method 1
contacting under elongation conditions an initiator having a free 3'-hydroxyl or elongated fragments having free 3'-O-hydroxyls with a 3'-O-blocked nucleoside triphosphate and a template-independent DNA polymerase so that the initiator or elongated fragments are elongated
Data Source
AI summary
The invention is directed to methods for synthesizing a plurality of oligonucleotides in the same reaction vessel, and in some embodiments, using the synthesized oligonucleotides in an oligonucleotide-based assay in such reaction vessel. In some embodiments, methods of the invention are implemented by steps of (a) providing a plurality of different initiators attached to one or more supports, each different initiator having a terminal nucleotide with a different 3-O-blocking group; (b) for each different initiator, synthesizing a polynucleotide by repeated cycles of template-free enzymatic additions of 3′-O-blocked nucleoside triphosphates, wherein the blocking group of the 3-O-blocked nucleoside triphosphate is removable under deblocking conditions orthogonal to the deblocking conditions for removing blocking groups of the other initiators; and (c) releasing the oligonucleotides from the polynucleotides and the one or more solid supports.