DMAA Hydrogel Expansion Microscopy for Nanoscale Tissue Imaging
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Solution Overview
Problem
Current microscopy techniques, such as diffraction-limited microscopy, struggle to achieve nanoscale precision for imaging biomolecules in cellular structures and tissues, which is essential for diagnosing pre-disease and disease states.
Innovation Solution
The method involves embedding cell or tissue samples in a dimethylacrylamide tri-functional polymer (DMAA-TF) that can be physically expanded, allowing for optical magnification with nanoscale precision without the need for complex hardware or destructive sectioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If diffraction-limited microscopy is used, then current microscopy equipment can be utilized, but nanoscale precision for imaging biomolecules cannot be achieved
Solution Approach 1:
The patent applies dimensional transformation by physically expanding the sample in three-dimensional space (isotropic expansion) rather than improving optical resolution in two-dimensional image space. The biomolecules are embedded in a hydrogel that expands uniformly, effectively magnifying the sample dimensions by 4-8x while maintaining the original optical microscopy system, thereby achieving nanoscale resolution with conventional microscopes.
Solution Approach 2:
The patent changes the physical state and dimensions of the sample by controlling hydrogel expansion parameters. The hydrogel matrix undergoes controlled swelling through water absorption, transforming the sample from a condensed state to an expanded state, which physically separates biomolecules and enables resolution of nanoscale structures that were previously indistinguishable at the diffraction limit.
2Measurement precision
If super-resolution microscopy methods are used, then nanoscale precision can be achieved, but complex hardware requirements and steep learning curve arise
Solution Approach 1:
The patent introduces a hydrogel expansion medium as an intermediary between the biomolecules and the microscopy system. This intermediary physically expands the sample while preserving biomolecule positions and interactions, allowing conventional optical microscopes to achieve super-resolution imaging without requiring complex super-resolution microscopy hardware or specialized operational techniques.
3Measurement precision
If electron microscopy methods are used, then nanoscale resolution can be achieved, but complex hardware and difficulty in applying to large-scale samples occur
Solution Approach 1:
The patent transforms the imaging problem from a two-dimensional electron beam interaction to a three-dimensional physical expansion of the sample itself. By isotropically expanding the hydrogel-embedded sample in all three spatial dimensions, the method enables conventional optical microscopes to resolve nanoscale structures in large-scale tissue samples without requiring electron microscopy hardware or sample sectioning.
4Measurement precision
If physical expansion of samples is performed, then nanoscale precision imaging is enabled, but preservation of biomolecules' three-dimensional distribution must be maintained
Solution Approach 1:
The patent merges the biomolecules with the hydrogel matrix through co-embedding, where the hydrogel network forms an integrated scaffold throughout the sample. During isotropic expansion, both the hydrogel and embedded biomolecules expand uniformly together, preserving the relative three-dimensional positions and spatial relationships of biomolecules while achieving nanoscale separation for improved resolution.
Solution Approach 2:
The patent achieves homogeneous expansion throughout the entire sample by using an isotropic hydrogel matrix that expands uniformly in all directions. This homogeneous expansion maintains the relative positions and spatial distribution of biomolecules throughout the sample, ensuring that nanoscale precision is achieved consistently across the entire expanded volume without distortion or non-uniform deformation.
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 higher resolution imaging of tissue samples, allowing for the visualization of subcellular structures with nanoscale precision, which is not achievable with traditional microscopy methods.
Implementation Method 1
Embedding cell or tissue samples in a dimethylacrylamide tri-functional polymer (DMAA-TF) to physically expand them, allowing for isotropic expansion and preservation of biomolecules' three-dimensional distribution
Data Source
AI summary
The invention provides a method for preparing an expanded cell or tissue sample suitable for microscopic analysis. Expanding the sample can be achieved by binding, e.g., anchoring, key biomolecules to a DMAA-TF polymer network and swelling, or expanding, the polymer network, thereby moving the biomolecules apart as further described herein. As the biomolecules are anchored to the polymer network isotropic expansion of the polymer network retains the spatial orientation of the biomolecules resulting in an expanded, or enlarged, sample.