Self-assembling Nucleic Acid Surfaces for Biosensor Orientation
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Solution Overview
Problem
Current biosensor production methods face inefficiencies due to random orientation of detection molecules, leading to reduced detection efficiency, sensitivity, and increased false positives/negatives, as they lack controlled and predictable binding sites for molecular recognition.
Innovation Solution
The development of nucleic acid structures comprising annealed motifs made from complementary oligonucleotides, which self-assemble into predictable, evenly spaced binding sites on surfaces, allowing for controlled orientation and attachment of receptors or molecules for biosensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If detection molecules are randomly immobilized on surfaces, then the process is simple and fast, but the orientation is uncontrolled leading to reduced detection efficiency and sensitivity
Solution Approach 1:
The detection molecule assembly is segmented into multiple functional domains: anchoring domains for surface attachment, spacer domains for positioning, and recognition domains for target binding. This segmentation allows each domain to perform its specific function independently, ensuring proper orientation and high detection efficiency while maintaining a systematic assembly process
Solution Approach 2:
The nucleic acid structures are pre-assembled with defined orientations and spacings before being introduced to the surface. This preliminary organization ensures that detection molecules are already positioned correctly for optimal recognition, eliminating the need for random immobilization and subsequent orientation correction
2Reliability
If detection molecules are randomly oriented on surfaces, then immobilization is straightforward, but access to recognition sites is blocked leading to false negative and false positive results
Solution Approach 1:
Different regions of the nucleic acid structure are assigned different functional qualities: the 5' end contains anchoring sequences for surface attachment, the middle section contains spacer sequences for positioning, and the 3' end contains recognition sequences for target binding. This local differentiation ensures that each part of the structure performs its intended function with high precision
Solution Approach 2:
The nucleic acid structure acts as an intermediary between the surface and the detection molecule. It provides a structured interface with defined geometry and chemistry that mediates the attachment process, ensuring proper orientation and spacing of detection molecules while maintaining accessibility of recognition sites
3Manufacturing precision
If uniform evenly distributed attachment sites are created, then molecular recognition is maximized, but the assembly process becomes more complex requiring sequential addition of complementary oligonucleotides
Solution Approach 1:
The nucleic acid structures utilize self-complementary sequences that enable self-assembly through hybridization. The structures automatically organize themselves into uniform arrays on the surface through base-pairing interactions, eliminating the need for complex external assembly procedures while achieving precise spacing and orientation
Solution Approach 2:
The spacing and orientation of attachment sites are controlled by modifying the nucleotide sequences and lengths of the nucleic acid structures. By changing parameters such as oligonucleotide length, sequence composition, and hybridization conditions, precise control over attachment site distribution is achieved without increasing process complexity
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 enhances the uniformity and reliability of biosensors by ensuring proper orientation of detection molecules, improving detection efficiency and reducing false results through controlled binding site formation.
Implementation Method 1
each of the first domain of a respective oligonucleotide of the at least three oligonucleotides being complementary for base pairing with a single one of the second domain of another oligonucleotide of the at least three oligonucleotides, to form the annealed motifs
Implementation Method 2
sequential addition will self-assembled as a nanoconstruction of highly predictable structures to optimize molecular recognition
Data Source
Figure 1A~3
Figure 4A~6
Figure 7A~7B
AI summary
The present document describes nucleic acid structures comprising a plurality of annealed motifs that are made from complementary oligonucleotides having domains with sequences complementary to other nucleotides of the motif. The annealed motifs may be anchored to surfaces, and functional elements may be attached to the annealed motifs. The nucleic acid structures may used to make sensors therefrom. The present document also describes methods to generate said nucleic acid structures.