DNA Docking-Strand Switching for Super-Resolution Imaging
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Solution Overview
Problem
Existing super-resolution microscopy methods require expensive instrumentation or specialized conditions, limiting their use in common biological laboratories.
Innovation Solution
Utilizing repetitive, transient binding of fluorescently labeled oligonucleotides to complementary docking strands, allowing stochastic switching between ON and OFF states for enhanced imaging resolution and sensitivity without the need for specialized equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional super-resolution microscopy methods (STED, PALM, STORM) are used, then spatial resolution is enhanced, but expensive instrumentation or highly specialized experimental conditions are required
Solution Approach 1:
The patent introduces an intermediary DNA-based switching mechanism that mediates between the fluorophore and the imaging system. The DNA hairpin structure acts as a controllable intermediary that regulates fluorophore accessibility to substrates, enabling resolution enhancement without requiring complex super-resolution microscopy instrumentation. This intermediary mechanism allows conventional microscopes to achieve super-resolution capability through controlled stochastic binding events.
Solution Approach 2:
The patent replaces the mechanical/optical complexity of super-resolution microscopy systems (such as specialized laser configurations, beam paths, and optical components) with a chemical/biological mechanism based on DNA hybridization and fluorophore-substrate binding kinetics. This substitution transforms the problem from an optical engineering challenge to a biochemical control problem, which can be solved with conventional instrumentation.
2Measurement precision
If targeted switching is used to confine fluorescence excitation, then spatial resolution is improved, but expensive and specialized equipment is needed
Solution Approach 1:
The patent changes the control parameter from optical intensity profiles (requiring specialized illumination patterns) to biochemical parameters such as DNA hybridization conditions, fluorophore-substrate binding affinity, and molecular conformational states. By controlling the probability of fluorophore-substrate binding through DNA-mediated mechanisms, the system achieves spatial confinement of fluorescence without requiring complex illumination optics or specialized equipment.
Solution Approach 2:
The system employs self-organizing biochemical processes where DNA hairpin structures autonomously control fluorophore accessibility through stochastic hybridization events. The molecular system itself performs the switching function without external control mechanisms, eliminating the need for complex instrumentation to enforce targeted switching patterns.
3Measurement precision
If stochastic switching with photoswitchable proteins or dyes is used, then super-resolution imaging is achieved, but highly specialized experimental conditions are required
Solution Approach 1:
The patent creates a universal DNA-based switching platform that can control various types of fluorophores (organic dyes, quantum dots, fluorescent proteins) through a common mechanism of substrate binding and conformational change. This multi-functional approach allows the same DNA hairpin structure to regulate different fluorophore types, enhancing adaptability across diverse imaging applications while using conventional experimental conditions.
Solution Approach 2:
The patent changes the switching mechanism from photochemical state transitions (requiring specific wavelengths and intensities) to biochemical binding events controlled by DNA hybridization thermodynamics and kinetics. This parameter change allows stochastic switching to occur under physiologically relevant conditions without requiring specialized photoswitching equipment or highly controlled experimental environments.
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
Achieves high-resolution imaging and increased sensitivity for detecting multiple biomolecular targets using a single fluorophore, enabling super-resolution imaging without specialized microscopes and improving detection specificity.
Implementation Method 1
repetitive, transient binding of short, labeled (e.g., fluorescently labeled) oligonucleotides (e.g., DNA oligonucleotides), or 'imager' strands, to complementary 'docking' strands
Implementation Method 2
fluorescent emission is detected using, for example, total internal reflection (TIR) or highly inclined and laminated optical sheet (HILO) microscopy
Implementation Method 3
fluorescent emission is detected using, for example, total internal reflection (TIR)
Implementation Method 4
Drift is a major source of error in super-resolution imaging and drift correction is an essential pre-processing step
Data Source
Figure 1A~1C
Figure 1D~1E
Figure 2
AI summary
The present disclosure provides, inter alia, methods and compositions (e.g., conjugates) for imaging, at high spatial resolution, targets of interest.