Spatially-Programmed Capture Probes for 3D Gene Expression Mapping
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Solution Overview
Problem
Current methods for studying spatial heterogeneity in tissues are limited by their inability to provide comprehensive three-dimensional data on gene expression, relying on pre-defined markers and two-dimensional sampling, which introduces selection bias and is costly and laborious.
Innovation Solution
A method involving spatially-programmed capture probes with a programmable migration domain, detectable moiety, and capture domain that migrates through a hydrogel matrix to hybridize with analytes, allowing for three-dimensional detection and quantitation of gene expression by determining the location and abundance of analytes in a biological sample.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If spatial heterogeneity is studied using traditional techniques with pre-defined markers, then the cost and labor are reduced, but the measurement precision and comprehensiveness of gene expression data are limited
Solution Approach 1:
The patent transitions from two-dimensional tissue section analysis to three-dimensional spatial gene expression detection by embedding tissue in a hydrogel matrix and using z-dimension migration of capture probes. This dimensional expansion enables comprehensive spatial mapping of gene expression throughout the entire tissue volume, resolving the contradiction between measurement precision and system complexity by adding a spatial dimension rather than increasing marker complexity
Solution Approach 2:
The patent introduces a hydrogel matrix as an intermediary medium between the tissue sample and the detection system. This hydrogel serves as a migration pathway for capture probes, enabling them to access and bind to target analytes throughout the three-dimensional tissue volume. The intermediary hydrogel system resolves the contradiction by providing a structured environment that facilitates precise spatial detection without requiring complex direct imaging systems
2Loss of information
If two-dimensional sampling is used for spatial analysis, then the device complexity is reduced, but the loss of information regarding three-dimensional spatial organization occurs
Solution Approach 1:
The patent explicitly addresses information loss by implementing three-dimensional detection capability through z-dimension migration of capture probes within the hydrogel matrix. The programmable migration domains enable probes to move along the z-axis and bind to targets at specific depths, thereby capturing complete three-dimensional spatial organization information that would be lost in two-dimensional sampling
Solution Approach 2:
The patent applies preliminary action by first embedding the tissue sample in the hydrogel matrix before introducing the capture probes. This pre-preparation creates a controlled three-dimensional environment that preserves spatial relationships and enables systematic probe migration throughout the tissue volume, ensuring complete spatial information capture without requiring complex real-time three-dimensional imaging systems
3Measurement precision
If RNA hybridization and immunohistochemistry are used for spatial gene expression analysis, then the measurement precision is improved, but the productivity and throughput are reduced due to laborious procedures
Solution Approach 1:
The patent implements self-service through the programmable migration domains in the capture probes, which autonomously navigate the three-dimensional hydrogel matrix to locate and bind their target analytes. This self-directed migration eliminates the need for manual section-by-section analysis, significantly improving productivity while maintaining the measurement precision of traditional RNA hybridization and immunohistochemistry methods
Solution Approach 2:
The patent enables continuous useful action by allowing multiple capture probes to simultaneously migrate and bind to targets throughout the entire three-dimensional tissue volume in parallel. This continuous, parallel processing approach maintains high measurement precision for each individual probe-target interaction while dramatically increasing overall throughput compared to sequential two-dimensional analysis methods
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 accuracy of genetic expression profiling by providing detailed spatial information of gene expression within tissues, enabling more precise localization and quantitation of analytes in three-dimensional space.
Implementation Method 1
a programmable migration domain that facilitates predetermined migration through a polymer matrix with high specificity
Implementation Method 2
hybridizing the spatially-programmed capture probe to the analyte, generating a hybridized spatially-programmed capture probe
Implementation Method 3
detecting the location of the detectable moiety in the hydrogel matrix, thereby determining a location of the spatially-programmed capture probe and/or analyte
Data Source
AI summary
This disclosure relates to compositions and methods for three-dimensional spatial profiling of analytes in a biological sample. The methods include use of a hydrogel comprising one or more polymers that include a phenol moiety, an azide moiety, or an alkyne moiety.