Molecular Programming Tools for Isothermal ssDNA Synthesis
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Solution Overview
Problem
Existing technologies lack efficient methods for isothermal synthesis of single-stranded DNA (ssDNA) with arbitrary user-prescribed sequences and dynamic molecular constructs, as well as tools for measuring molecular distances and environments at the nanoscale.
Innovation Solution
The use of primer exchange reactions (PER) involving catalytic DNA hairpin species to pattern the isothermal synthesis of ssDNA, molecular motors for programmable molecular component generation, and molecular rulers for recording nanoscale distances, utilizing strand displacement polymerase and deoxyribonucleotide triphosphates (dNTPs) to create nucleic acid records.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional PCR and rolling circle amplification are used, then DNA amplification can be achieved, but the synthesis cannot be performed isothermally and lacks precise spatial patterning control
Solution Approach 1:
The patent segments the DNA synthesis process into discrete primer exchange steps, where individual hairpin catalysts add specific nucleotide sequences at controlled locations. This segmentation enables both isothermal operation and precise spatial patterning by separating the amplification function into modular, location-specific catalytic events rather than requiring thermal cycling of the entire reaction mixture.
Solution Approach 2:
The patent introduces hairpin-shaped DNA catalysts as intermediary molecules that mediate the synthesis process. These hairpin intermediaries bind to specific primer sequences and catalyze the addition of defined nucleotide blocks, enabling precise spatial control of synthesis while maintaining isothermal conditions. The hairpin intermediaries act as programmable mediators between the primer templates and the final amplified product.
2Manufacturing precision
If DNA nanostructures are used for precise spatial patterning, then molecular positioning is improved, but the system complexity increases
Solution Approach 1:
The patent employs self-assembling DNA hairpin structures that automatically position themselves through complementary base pairing. The hairpin catalysts contain built-in recognition sequences that guide them to specific locations on the primer templates without requiring external positioning machinery. This self-service mechanism achieves precise molecular positioning while minimizing system complexity by utilizing the inherent programmability of DNA sequences.
Solution Approach 2:
The patent controls molecular positioning by changing sequence parameters of the DNA hairpins and primers rather than altering physical device architecture. By programming specific nucleotide sequences, the system achieves precise spatial patterning through biochemical recognition and binding affinity variations, avoiding the need for complex mechanical or structural positioning systems.
3Manufacturing precision
If primer exchange reactions are used for isothermal synthesis, then synthesis precision is improved, but the reaction requires multiple components increasing system complexity
Solution Approach 1:
The patent designs universal hairpin catalysts that can perform multiple functions: they serve as primers, catalysts, and sequence-specific recognition elements simultaneously. Each hairpin is engineered with a catalytic domain, a recognition domain for binding to specific primer sequences, and a template domain for guiding nucleotide addition. This multi-functionality reduces the need for separate specialized components while maintaining high synthesis precision.
Solution Approach 2:
The patent merges several functional elements into single integrated DNA molecules. The hairpin catalysts combine the primer binding function, catalytic activity, and sequence specification into one molecular entity. This merging of functions reduces the total number of discrete components required in the system while achieving precise isothermal synthesis through the coordinated action of these multifunctional molecules.
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 the isothermal synthesis of ssDNA with arbitrary sequences, allows for molecular motors to actively manufacture components where needed, and records molecular distances with high precision, providing a new generation of molecular devices for molecular programming and environmental inspection.
Implementation Method 1
relative ease of programming Watson-Crick base pairing complementarity
Implementation Method 2
pattern the isothermal synthesis of single-stranded DNA (ssDNA) in a stepwise fashion
Implementation Method 3
using a strand displacement polymerase
Implementation Method 4
using catalytic DNA hairpin species
Implementation Method 5
a partially-paired molecule (e.g., hairpin molecule) that acts catalytically
Data Source
AI summary
The present disclosure provides, in some aspects, nucleic acid-based molecular tools that enable the recording of molecular structure and soluble signals as well as the programmed assembly of molecular structures.