Structure-Assisted Evolution of Multivalent Aptamers
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current DNA origami technology faces challenges in achieving complex structures due to high costs and high error rates in self-assembly, limiting the development of advanced nanostructures.
Innovation Solution
The method involves structure-assisted evolution of multivalent ligands, specifically multimeric aptamers, by linking random nucleic acid sequences to defined single-stranded DNA or RNA origami nanostructures, immobilizing target polypeptides, and undergoing directed evolution to enhance affinity and specificity, using techniques like PCR amplification and paranemic DNA crossover folding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If DNA self-assembly is used to build complex nanostructures, then the capacity to create novel designer nanoarchitectures is improved, but the error rate increases and cost increases
Solution Approach 1:
The patent employs directed evolution where the aptamer library evolves and selects itself through iterative binding cycles to the target, with high-affinity sequences being enriched automatically. The system serves itself by using the target molecule as a selection pressure to drive evolution toward higher affinity binders, reducing manual intervention and improving reliability through natural selection mechanisms.
Solution Approach 2:
The patent changes key parameters during the directed evolution process including increasing the number of binding sites (valency) from 1 to multiple sites on the DNA origami scaffold, adjusting the concentration ratios of library to target, and modifying the iterative cycles of selection and amplification. These parameter changes enable the system to overcome the limitations of single-step self-assembly and achieve high-affinity multivalent aptamers with reduced error rates.
2Manufacturing precision
If DNA origami technology is used for complex structures, then structural precision is improved, but manufacturing cost increases
Solution Approach 1:
The patent segments the aptamer library into multiple independent binding sites that can be displayed on the DNA origami scaffold. Each binding site evolves independently through the directed evolution process, allowing parallel selection of multiple high-affinity sequences. This segmentation enables the system to achieve high structural precision through modular evolution rather than requiring complete redesign of entire structures, thereby reducing manufacturing costs.
Solution Approach 2:
The patent uses PCR amplification to copy and replicate the selected high-affinity aptamer sequences across multiple generations of the library. The DNA origami scaffold serves as a reusable template that can be synthesized once and then used to display multiple copies of evolving aptamer sequences. This copying mechanism reduces the need for de novo synthesis of complex structures, thereby lowering manufacturing costs while maintaining structural precision.
3Reliability
If multivalent aptamers are evolved through directed evolution, then affinity and specificity are improved, but process complexity increases
Solution Approach 1:
The patent employs a universal DNA origami scaffold design that can display multiple aptamer binding sites in various configurations (e.g., linear arrays, clusters, or spatial patterns). This universal scaffold can be used across different directed evolution experiments targeting different molecules, reducing the need to develop new complex structures for each target. The multi-functionality of the scaffold simplifies the overall process complexity while enabling the evolution of high-affinity multivalent aptamers with enhanced specificity.
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 the scalable production of high-affinity, high-specificity multivalent aptamers, reducing costs and improving accuracy, enabling applications in diagnostics, therapeutics, and biosensing.
Implementation Method 1
the Watson-Crick base-pairing makes the hybridization between DNA strands highly predictable
Implementation Method 2
the origami nanostructure comprises a single long DNA strand and can be replicated by DNA polymerases
Implementation Method 3
linking a random library of nucleic acid sequences for aptamer selection to a defined single-stranded DNA (ssDNA) or RNA origami nanostructure
Data Source
AI summary
Provided herein are methods and systems for structure-assisted evolution of multivalent aptamers using a single stranded DNA or single-stranded RNA nanostructure as a structural support. Also provided herein are methods for constructing ssDNA or ssRNA nanostructures as structural supports suitable for structure-assisted evolution of multivalent aptamers.