Master-Copy Recessed Arrays for Single-Cell Spatial Detection
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Solution Overview
Problem
Existing methods for spatial profiling of biological analytes in tissues fail to provide information on the position of single cells within a biological sample, limiting the understanding of spatial heterogeneity and its impact on cell morphology, differentiation, and signaling.
Innovation Solution
The development of a method involving a substrate with recessed wells and immobilized capture probes, each with a unique barcode, allows for the spatial tagging and identification of biological analytes by applying a spatially-tagged analyte capture agent to a biological sample, enabling the determination of analyte location at single-cell resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If traditional spatial profiling methods are used, then some analyte data can be obtained, but information on the position of single cells within the biological sample is lost
Solution Approach 1:
The substrate is divided into multiple wells, each well serving as an independent spatial compartment. Capture probes with unique barcodes are immobilized in each well, enabling segmentation of the tissue sample into discrete spatial units that can be individually tracked and analyzed.
Solution Approach 2:
A master array of capture probes with unique spatial barcodes is created on the substrate. Tissue sections are then copied onto this master array, allowing the spatial information encoded in the barcode pattern to be transferred and preserved in the copied tissue sections.
2Measurement precision
If high-density capture probe arrays are created, then spatial resolution is improved, but manufacturing complexity increases
Solution Approach 1:
The spatial barcode pattern is pre-established on the substrate before tissue sections are applied. Capture probes with unique barcodes are immobilized in predetermined locations, creating a ready-made spatial coordinate system that simplifies subsequent tissue processing and analysis.
Solution Approach 2:
The master array substrate serves multiple functions: it provides the physical support for tissue sections, contains the spatial encoding information through barcode patterns, and facilitates the immobilization of capture probes. This multi-functionality reduces the need for separate components and simplifies the overall system.
3Measurement precision
If tissue sections are processed through multiple steps, then analyte detection capability is improved, but spatial context may be lost
Solution Approach 1:
The master array with its barcode-encoded spatial information serves as an intermediary between the tissue sample and the detection system. By maintaining physical association with the master array throughout processing steps, the spatial context is preserved as a mediator that links the processed tissue back to its original position.
Solution Approach 2:
Spatial barcodes are assigned and immobilized on the substrate before any tissue processing occurs. This preliminary establishment of spatial coordinates ensures that even as tissue undergoes various processing steps, the spatial reference framework is already in place to maintain context.
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 provides high-resolution spatial profiling of analytes within tissues, retaining native spatial context and enabling accurate identification of analyte locations, which can inform treatment selection and disease mechanism understanding.
Implementation Method 1
immobilized capture probes, each with a unique barcode, allows for the spatial tagging and identification of biological analytes
Implementation Method 2
a capture probe of the plurality of capture probes comprises a barcode unique to the well, such that one end of a capture probe is immobilized on the recessed surface of the well
Data Source
AI summary
This disclosure provides methods for spatial profiling of biological analytes present in a biological sample. Methods include generating feature arrays using a master/copy format using recessed arrays, and methods for using such arrays. For example spatially-tagged analyte capture analytes can be used in spatial detection in methods to determine the location of analytes (e.g., proteins) in biological samples.