Nucleic Acid Nanostructure Signal Amplification
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Solution Overview
Problem
Current fluorescence amplification methods in life sciences face limitations in multiplexing, specificity, and control over amplification factors, making it difficult to detect multiple low-density or low-concentration targets simultaneously with high precision.
Innovation Solution
The use of nucleic acid nanostructure complexes, comprising a primary nucleic acid nanostructure linked to one or more secondary nucleic acid nanostructures via hybridized double-stranded linkers, allows for controlled amplification of fluorescence signals by varying the number and spectral profile of secondary nanostructures, enabling high multiplexing and specificity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If secondary antibodies are used for fluorescence amplification, then the fluorescent signal is amplified allowing detection of weakly expressed targets, but the degree of multiplexing is severely limited to only a handful of different fluorescent labels
Solution Approach 1:
The invention segments the amplification system into multiple independent signal amplification pathways, each using a different probe type (e.g., molecular beacons, FISH probes, antibody-conjugated probes) that can be simultaneously applied to detect multiple different targets. This segmentation allows each probe to independently amplify its target's signal while maintaining the ability to multiplex across many targets using spectrally distinct fluorophores.
Solution Approach 2:
The invention creates a universal amplification platform where a single secondary antibody conjugated to a fluorophore can serve multiple functions by recognizing different primary antibodies through Fc region binding. This universal secondary antibody can amplify signals from multiple different primary antibodies simultaneously, enabling high-plex detection without requiring separate amplification reagents for each target.
2Illumination intensity
If conventional amplification methods are used, then signal amplification is achieved, but specificity is lacking resulting in amplification of multiple targets rather than a single well-defined target
Solution Approach 1:
The invention applies local quality by designing probes with highly specific binding domains that recognize unique epitopes or sequence motifs on individual targets. Each probe is engineered with localized specificity features (such as antigen-specific binding regions or sequence-complementary oligonucleotide regions) that ensure it binds only to its intended target, preventing cross-reactivity and non-specific amplification while maintaining strong signal amplification.
3Illumination intensity
If current amplification methods are used, then fluorescence signal is amplified, but control over amplification factor is poor producing a distribution of amplification factors across various targets
Solution Approach 1:
The invention employs parameter changes by systematically varying the stoichiometry of probe-to-target ratios, the concentration of secondary antibodies, and the incubation conditions to achieve precise control over amplification factors. By adjusting these parameters, the method produces uniform amplification across all targets, enabling quantitative measurements and reducing signal distribution variability.
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 significantly enhances the ability to detect multiple targets with high specificity and precision, providing tunable amplification factors and increased sensitivity, allowing for the detection of weakly expressed targets and single molecules.
Implementation Method 1
comprising a primary nucleic acid nanostructure linked to one or more secondary nucleic acid nanostructures via hybridized double-stranded linkers
Implementation Method 2
Fluorescence-based detection is a ubiquitous tool used throughout the life sciences to observe, identify, and differentiate between various molecular targets of interest
Data Source
AI summary
Provided herein are nucleic acid nanostructure-based compositions that enable amplification of detectable signals and methods that enable tunable, well-controlled, and quantitative amplification of detectable signals from labeled target molecules.