3D Nucleic Acid Sequencing with Core-Shell Polymer Imaging
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Solution Overview
Problem
Sequencing-by-synthesis methods face limitations in achieving high resolution due to diffraction limits and the need for high numerical aperture microscopy, which restricts the field of view and total information content in imaging systems.
Innovation Solution
The use of core-shell polymer structures, where each core is surrounded by a shell polymer, with attached core polynucleotide primers and target nucleic acids, allows for amplification and sequencing of target polynucleotides, enabling detection of amplicon clusters in multiple two-dimensional planes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high numerical aperture microscopy is used to achieve high resolution, then optical resolution is improved, but field of view is restricted
Solution Approach 1:
The patent transitions from two-dimensional imaging to three-dimensional imaging by utilizing optical sections at different depths (z-stacks). This allows the system to achieve high resolution through optical sectioning while maintaining a large field of view by capturing multiple planes of data that can be computationally reconstructed. The core-shell structure enables this by providing distinct optical signals from core and shell regions that can be differentiated in 3D space.
Solution Approach 2:
The patent segments the imaging problem into multiple optical sections at different depths rather than requiring a single high-resolution 2D image. By capturing images at multiple z-positions and computationally reconstructing the data, the system achieves high resolution without sacrificing field of view. The core-shell structure provides natural segmentation for this approach, with the core containing primers and the shell providing structural context.
2Measurement precision
If high numerical aperture microscopy is used to achieve high resolution, then imaging quality is improved, but total information content is limited
Solution Approach 1:
The patent adds the depth dimension (z-axis) to traditional 2D imaging, enabling three-dimensional reconstruction of nucleic acid sequences. This volumetric approach increases total information content by capturing spatial relationships across multiple planes, allowing differentiation of closely spaced features that would be indistinguishable in 2D. The core-shell structure provides enhanced contrast for this 3D reconstruction.
Solution Approach 2:
The patent employs continuous optical sectioning through the sample depth, capturing multiple optical sections that can be computationally stitched together to create a complete three-dimensional view. This continuous sampling of data across z-heights ensures no information is lost and enables reconstruction of the complete nucleic acid sequence structure with high fidelity.
3Productivity
If diffraction limits are used to constrain imaging, then imaging speed is maintained, but resolution is limited
Solution Approach 1:
The patent overcomes diffraction limits by moving to three-dimensional optical sectioning, where the resolution is determined by the section thickness and z-position rather than being constrained by lateral diffraction limits. This allows high imaging rates to be maintained while achieving superior resolution through computational reconstruction of the 3D structure from multiple optical sections.
Solution Approach 2:
The patent replaces traditional mechanical high-NA microscopy with a computational approach using optical sectioning and image processing. Instead of relying on complex optical systems to achieve high resolution, the system uses multiple standard-resolution images at different depths and computationally reconstructs high-resolution 3D structures, substituting mechanical optical complexity with computational algorithms.
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 optical resolution and imaging rates, allowing for improved nucleic acid sequencing by overcoming diffraction limits and increasing the density of cluster spacing.
Implementation Method 1
The shell provides optical isolation between the cores. In an embodiment, the shell is formed from a polymer material that is optically distinct from the core polymer.
Implementation Method 2
The core-shell structures described herein may be utilized for super-resolution imaging, which enables optical imaging at a resolution beyond the diffraction limit.
Data Source
AI summary
Provided herein are methods and compositions for improved sequencing techniques using, for example, polymeric particles and/or three-dimensional structures.