Nucleic Acid Molecular Computing via Chemical Modification
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Solution Overview
Problem
Current nucleic acid-based molecular computing systems face limitations in information propagation due to slow reaction rates, primarily caused by unproductive 'toe-hold clashes' that hinder the efficient conversion of nucleic acid sequences, making them unsuitable for biologically relevant timescales.
Innovation Solution
Chemical modifications are introduced to enhance the binding affinity of desired nucleic acid interactions while reducing the affinity of unproductive interactions, facilitating branch migration reactions and improving the thermodynamic favorability for productive strand displacement, thereby accelerating information propagation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If chemical modifications are introduced to enhance binding affinity, then the rate of information processing increases, but the complexity of the system increases
Solution Approach 1:
The patent applies parameter changes by modifying the chemical structure of nucleic acid molecules (changing from natural to modified nucleosides) to alter binding affinity parameters. This enables selective enhancement of productive binding while reducing unproductive binding, thereby increasing information processing rate without requiring fundamental system redesign
Solution Approach 2:
The patent implements local quality by introducing chemical modifications at specific positions within the nucleic acid sequences rather than uniformly throughout. This targeted approach allows selective influence on binding interactions at critical locations, improving reaction rates while minimizing overall system complexity
2Reliability
If chemical modifications are made to facilitate branch migration, then the thermodynamic favorability improves, but the ease of manufacture decreases
Solution Approach 1:
The patent changes thermodynamic parameters by incorporating modified nucleosides that alter hybridization free energy. This enables better control over branch migration thermodynamics, making productive reactions more favorable while allowing standard manufacturing protocols to be maintained
3Productivity
If the binding affinity of desired interactions is enhanced, then the rate of productive binding events increases, but the specificity requirements increase
Solution Approach 1:
The patent applies local quality by placing chemical modifications at specific positions within nucleic acid sequences where they can differentially affect binding interactions. This allows enhancement of desired binding affinity while maintaining or even improving specificity, as the modifications are strategically positioned to favor productive over unproductive binding
Solution Approach 2:
The patent changes binding affinity parameters through chemical modification, enabling selective enhancement of productive binding rates. By altering the thermodynamic parameters of specific interactions, the system achieves faster information processing while maintaining appropriate specificity through the selective nature of the modifications
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 approach significantly increases the rate of information processing by favoring productive binding events and disfavoring unproductive ones, enabling the construction of larger nucleic acid networks capable of operating on biologically relevant timescales without altering the sequence content.
Implementation Method 1
Hybridization involves free, single-stranded stretches of nucleic acids. Accordingly, a nucleic-acid network may be regulated by the availability of these free strands.
Implementation Method 2
upon binding the nucleic acid structure undergoes a transition in energy state due to a branch migration reaction involving the duplex domain producing an output polynucleotide sequence
Implementation Method 3
at least one polynucleotide clashing molecule capable of binding with the nucleic acid structure under hybridizing conditions
Data Source
Figure 1A
Figure 1B
Figure 2A
AI summary
A method for improving a nucleic acid-based molecular computing system includes (A) identifying a computing system comprised of (i) a nucleic acid structure that includes an incompletely base-paired duplex domain, (ii) at least one polynucleotide displacement molecule that can bind with the nucleic acid structure under hybridizing conditions, such that the nucleic acid structure undergoes a transition in energy state due to a branch migration reaction involving the duplex domain, and (iii) a clashing polynucleotide molecule that competes with the polynucleotide displacement molecule for binding the nucleic acid structure under the hybridizing conditions but that cannot produce a branch migration reaction involving the duplex domain; then (B) reconfiguring at least one of the displacement molecule and the nucleic acid structure, respectively, to incorporate a chemical modification relative to a first reference molecule that comprises natural nucleosides and has the same sequence content as the displacement molecule or the nucleic acid structure, as the case may be, wherein the modification causes binding of the displacement molecule and the nucleic acid structure to have a hybridization free energy, differing from that of a first reference binding between the displacement molecule or the nucleic acid structure and the first reference molecule, such that the branch migration reaction is facilitated relative to the first reference binding; and/or (C) reconfiguring at least one of the clashing molecule and the nucleic acid structure, respectively, to incorporate a chemical modification relative to a second reference molecule that comprises natural nucleosides and has the same sequence content as the clashing molecule or the nucleic acid structure, as the case may be. The modification effected via such reconfiguring causes binding of the clashing molecule and the nucleic acid structure to have a hybridization free energy, differing from that of a second reference binding between the clashing molecule or the nucleic acid structure and the second reference molecule, such that binding of the clashing molecule is impeded relative to the second reference binding.