Patterned Nanowell Spatial Transcriptomics
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Solution Overview
Problem
Current spatially resolved transcriptome profiling techniques are limited by high costs, difficulty of implementation, biased and species-specific RNA capture, and low spatial resolution.
Innovation Solution
A method utilizing a patterned nanowell array substrate with spatially separated capture probes to conduct spatial transcriptomics, allowing for the spatial detection of RNA in tissue samples by binding RNA molecules to capture probes, generating cDNA, and sequencing to correlate spatial barcodes with RNA expression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If probe-based methods are used for spatial transcriptomics, then spatial resolution can be achieved, but RNA capture becomes biased and species-specific limiting comprehensive analysis
Solution Approach 1:
The patent employs whole transcriptome capture probes that can bind to any RNA molecule regardless of species or type, making the system universal. The capture probes contain poly-T sequences that bind to poly-A tails of mRNA from any species, eliminating species-specific bias while maintaining spatial resolution through barcode incorporation.
Solution Approach 2:
The capture probe is segmented into multiple functional domains: a poly-T capture domain for universal RNA binding, a spatial barcode for location identification, and a UMI for molecular counting. This segmentation allows the single probe to achieve both comprehensive RNA capture and precise spatial measurement.
2Measurement precision
If established spatial transcriptomics techniques are used, then spatially resolved transcriptome profiling can be achieved, but costs become excessively high
Solution Approach 1:
The patent uses a simplified substrate design with patterned nanowells that can be manufactured at low cost using standard microfabrication techniques. The capture probes are designed as single-use reagents that are inexpensive to synthesize in large quantities, eliminating the need for expensive proprietary kits while maintaining measurement precision.
Solution Approach 2:
The patent changes key parameters including using standard poly-T sequences instead of complex probe designs, employing barcodes with standard nucleotide compositions, and using conventional sequencing adapters. These parameter changes reduce manufacturing complexity and cost while preserving the ability to achieve accurate spatial transcriptome profiling.
3Adaptability or versatility
If academic methods are used for spatial transcriptomics, then research capabilities can be developed, but difficulty of implementation becomes prohibitive
Solution Approach 1:
The patent incorporates all necessary components into the capture probe design beforehand: the poly-T capture domain, spatial barcode, UMI, and sequencing adapter are pre-assembled in a single oligonucleotide. This preliminary action eliminates multiple complex assembly steps during experimentation, making the method easy to implement while retaining full research capability.
Solution Approach 2:
The patent merges multiple functional elements (capture domain, barcode, UMI, adapter) into a single integrated capture probe structure. This consolidation simplifies the experimental workflow by eliminating separate steps for probe preparation, barcode assignment, and adapter ligation, thereby reducing implementation difficulty while maintaining versatility.
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 improved spatial resolution and cost-effectiveness, enabling more comprehensive and accurate spatial transcriptome analysis compared to existing methods.
Implementation Method 1
The most established and commonly employed SRT techniques entail the hybridization of mRNA onto DNA oligonucleotide probes
Implementation Method 2
The captured mRNA is subsequently subjected to reverse transcription (RT), with the capture probe serving as a primer to initiate the RT reaction
Data Source
Figure 1A~1B
Figure 1C~1D
Figure 1E~2C
AI summary
The invention pertains to a method of spatially resolved detection of nucleic acids in tissue samples. The method of the invention comprises a use of a patterned nanowell structure as a substrate to conduct a transcriptome analysis using clusters of spatially separated capture probes. The invention further provides a method for spatial detection of RNA in a tissue sample, and kits for use in the inventive methods.