Connected Probe Capture on Spatial Arrays for Single-Cell Mapping
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Solution Overview
Problem
Existing spatial analysis techniques fail to provide information on the position of single cells within a biological sample, limiting the understanding of spatial heterogeneity and analyte distribution.
Innovation Solution
A method involving hybridization of probe oligonucleotides to nucleic acid analytes, followed by alignment with an array containing capture probes with spatial barcodes, allowing for the release and migration of connected probes to the array for sequencing and analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If spatial analysis techniques are used to determine analyte location, then spatial heterogeneity information is obtained, but information on the position of single cells within the biological sample is not provided
Solution Approach 1:
The biological sample is divided into discrete single cells that are individually positioned on the array substrate. Each cell's position is captured separately through the spatial barcode system, enabling single-cell resolution spatial analysis while maintaining the overall spatial heterogeneity information of the tissue architecture.
Solution Approach 2:
Spatial barcodes serve as intermediary elements that bridge the gap between the biological sample and the detection system. These barcodes are assigned to specific locations on the array substrate and enable precise tracking of single cell positions while preserving spatial context, thus resolving the contradiction between maintaining spatial information and achieving single-cell position precision.
2Measurement precision
If probe oligonucleotides are hybridized to nucleic acid analytes and connected probes are released for array migration, then high-resolution spatial analysis is enabled, but the process complexity increases
Solution Approach 1:
Probe oligonucleotides are pre-hybridized to nucleic acid analytes before array migration. The connected probes are prepared in advance with release mechanisms, allowing the complex hybridization and connection steps to be completed prior to the migration phase. This preliminary action simplifies the overall process by separating complex preparation steps from the migration step.
Solution Approach 2:
The complex hybridization and connection processes are extracted and performed separately before array migration. By taking out these complex steps and completing them in a preparatory phase, the actual migration process becomes simpler and more straightforward, reducing the perceived process complexity while maintaining high-resolution spatial analysis capability.
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
Enables high-resolution spatial analysis of analytes, retaining native spatial context and facilitating downstream processing, such as sequencing, to determine the location and abundance of analytes within biological samples.
Implementation Method 1
hybridizing a first probe oligonucleotide and a second probe oligonucleotide to the nucleic acid analyte
Implementation Method 2
migrating the connected probe from the biological sample to the array
Data Source
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AI summary
Provided herein are methods for capturing a connected probe and/or a capture handle sequence to a capture domain of a capture probe.