Baseless Nucleotide Analogues for High-Yield DNA Synthesis
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Solution Overview
Problem
Current ferrocene-based nucleotide analogues for DNA synthesis suffer from low coupling efficiency, leading to unacceptable yields in routine oligonucleotide synthesis, especially for longer sequences, and exhibit nonspecific binding and hydrophobicity issues, limiting their utility in automated DNA synthesis.
Innovation Solution
Development of 'baseless' nucleotide analogues with a redox active moiety, such as ferrocene, incorporated into the backbone of nucleic acids using specific linkers and solubility moieties, enhancing coupling efficiency and reducing nonspecific binding, while maintaining hybridization functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If ferrocene-containing labeling agents are used to end-label oligos at 5' or 3' end, then electrochemical detection sensitivity is improved, but coupling efficiency deteriorates
Solution Approach 1:
The patent extracts the ferrocene labeling function from the nucleotide base structure and places it in the sugar moiety instead. This separation allows the ferrocene group to be incorporated without the base-related coupling efficiency problems, while maintaining electrochemical detection capability through the ferrocene redox activity.
Solution Approach 2:
The patent applies different functional groups to different parts of the nucleotide structure: the base maintains its hybridization function while the sugar incorporates the ferrocene redox-active group. This local differentiation allows each component to optimize its specific function without interfering with the other.
2Ease of manufacture
If ferrocene phosphoramidites are used in automated DNA synthesis, then labeling is achieved, but coupling yield deteriorates
Solution Approach 1:
The ferrocene group is extracted from the phosphoramidite coupling chemistry and placed in the sugar structure. This allows standard phosphoramidite synthesis to proceed with high coupling yields while the ferrocene labeling is introduced through the sugar incorporation mechanism, separating the labeling function from the coupling process.
3Measurement precision
If base-containing redox labels are used, then electrochemical detection is enabled, but nonspecific binding increases
Solution Approach 1:
The redox-active ferrocene group is extracted from the base structure and relocated to the sugar moiety. This extraction removes the source of nonspecific binding interactions while preserving the electrochemical detection function through the ferrocene redox activity in the sugar position.
Solution Approach 2:
Instead of attaching the redox label to the base as in conventional approaches, the patent inverts the attachment point to the sugar. This inversion fundamentally changes the interaction profile, eliminating base-mediated nonspecific binding while maintaining detection capability.
4Measurement precision
If ferrocene is used as label agent, then electrochemical detection is achieved, but hydrophobicity issues arise
Solution Approach 1:
The patent introduces hydrophilic linkers and spacer groups as intermediaries between the ferrocene label and the nucleotide structure. These intermediary elements provide hydrophilic character that reduces hydrophobicity-related problems while still allowing the ferrocene group to function as the redox-active labeling agent.
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
The new nucleotide analogues achieve high coupling efficiency, improving overall yield in nucleic acid synthesis and reducing nonspecific binding, making them suitable for routine automated DNA synthesis and detection applications.
Implementation Method 1
electrochemical detection ('ECD'), which can be highly sensitive, rapid and amenable to inexpensive production in miniaturized ('lab-on-a-chip') formats. Most electrochemical applications are based upon introducing one or more copies of a conjugated redox label, typically metal complexes, metallocenes or quinines.
Data Source
AI summary
Baseless nucleotide analogs are provided. Said analogs are used in the detection of target nucleic acids. The analogs have formula (I) wherein X is a backbone spacer; S is a solubility moiety; t is 0 or 1; V is a redox active moiety; L1 and L2 are linkers; n = 0 or 1; m = 0 or 1; wherein n + m is at least 1; P1 and P2 are independently selected from the group consisting of hydrogen, phosphoramidite, a protecting group, and a nucleoside containing group, wherein at least one of P1 and P2 is said protecting group or said nucleoside containing group; and q is greater than or equal to 1.