Here's the summary of the transcript in the requested format:
Abstract:
This presentation introduces Takara Bio's innovative spatial omics platforms, Treker and Seeker, with a deep dive into Treker's transformative approach to single-cell spatial mapping. Angela Dorigatti, a spatial field application scientist, highlights the limitations of existing spatial technologies, such as low sensitivity and deconvolution challenges. She then presents Treker as a solution offering true single-cell resolution by spatially barcoding individual nuclei prior to standard single-cell sequencing workflows. The technology leverages unique tiles with barcoded beads and UV-cleavable linkers to release oligos up into fresh-frozen tissue, enabling precise 2-micron positional triangulation of nuclei. Key advantages emphasized include high gene coverage, preservation of multiomic capabilities, seamless integration with existing single-cell infrastructure (e.g., 10x Genomics, BD Rhapsody), and significant reduction in data analysis complexity. The presentation showcases successful applications in mapping cell types and cortical layers in mouse brain tissue, discusses optimized loading densities, and touches upon forthcoming FFPE compatibility and user-friendly bioinformatics solutions.
Understanding Takara Bio's Treker for Single-Cell Spatial Mapping
0:03 Introduction to Treker and Seeker: Angela Dorigatti introduces Takara Bio's new spatial technologies, Treker (single-cell spatial mapping) and Seeker (spatial RNA-seq mapping).
0:47 Takara Bio's Background: Takara Bio, established as Clontech Laboratories in 1984, expanded into single-cell biology through acquisitions like Rubicon Genomics, Wafergen Biosystems, and most recently, Curio Biosciences, specializing in spatial technology.
2:28 Limitations of Current Single-Cell Analysis: While various single-cell techniques (cell per well, droplet-based, combinatorial indexing) yield barcoded cells/nuclei, they lack crucial spatial context, making it difficult to understand the structural and functional relationships within tissues.
Sequencing-based (e.g., Vizium): Only captures 10-15% of mRNA, resulting in low sensitivity (dozens to hundreds of genes/cell) and deconvolution issues when multiple cell types overlap on a single spot, muddying data.
Microscopy-based (e.g., Xenium, FISH): Limited by probe panels, fluorophores, and antibody quality, often requiring segmentation or deconvolution due to insufficient resolution.
5:54 Introducing Treker: True Single-Cell Spatial Resolution: Treker, based on the "slide tags" technology, is presented as the first true single-cell resolution kit. It spatially barcodes each cell before sequencing, integrates into standard single-cell workflows, and maintains high sensitivity (hundreds to thousands of genes/cell).
A tile with a monolayer of beads, each containing a unique spatial barcode, is used.
Fresh-frozen tissue is placed on the tile, and a UV lamp releases barcoded oligos up into the tissue (using a photo-cleavable linker).
Nuclei are then isolated, yielding both a gene expression library and a Treker spatial library.
The unique ratio of oligos donated from nearby beads allows for precise GPS-like triangulation of each nucleus's original location within two microns. This upward diffusion mechanism is advantageous, unlike traditional slide-based methods where downward diffusion can add noise.
Duplet Detection: Pre-barcoding enables confident detection and removal of duplets, cleaning up the data.
No Specialized Equipment: Besides a one-time UV lamp purchase and a cryostat, no specific instrumentation is needed, integrating with existing 10x Genomics or BD Rhapsody workflows.
Efficient Workflow: The protocol is quick, taking only about an hour upstream of nuclei suspension, and faster dissociation times (10-20 minutes) reduce cell type bias and preserve rare cells.
Multiomics Re-enabled: Treker re-enables multiomic capabilities (e.g., ATAC-seq, TCR/BCR, 10x Multiome) that were often lost with slide-based spatial assays, by working with nuclei.
14:51 Application Example: Mouse Brain Mapping: Treker successfully identified and spatially mapped major cell types and detailed structures like cortical layers in a 25-micron mouse brain section, demonstrating high-resolution analysis without the need for deconvolution or segmentation.
18:04 Optimized Loading and Throughput: For a 25-micron tissue slice, loading 10,000 to 30,000 nuclei (7-20% of total isolated) yields highly detailed spatial maps. Users can run subsets of nuclei to manage costs or multiplex multiple smaller samples on a single tile.
21:58 User-Friendly Bioinformatics: Takara Bio provides a local pipeline and partners with LatchBio (pay-per-use, easy interface) and Bioouring (Spatial X platform) for streamlined data analysis, eliminating the need for complex cell segmentation or deconvolution.
26:21 Nuclei Isolation and Tissue Thickness: Approximately 50% nuclei loss is expected during isolation. A minimum tissue thickness of 25 microns is recommended (nuclei typically 10 microns) to ensure intact nuclei, though up to 30 microns is possible for more nuclei. Protocols for challenging tissues (e.g., brain myelin removal, pestle grinding for tough tissues) are available.
27:37 Low Sequencing Requirement for Spatial Library: The Treker spatial library requires significantly fewer reads (5,000 reads/nucleus for 10x, 1,000 for BD Rhapsody) compared to the gene expression library (20,000-50,000 reads/nucleus).
30:34 Upcoming FFPE Compatibility (Treker FX): A version compatible with FFPE (fixed) tissues, "Treker FX," is expected by the end of the year. This will allow for H&E staining on the same tissue section and the ability to store fixed nuclei.
32:18 Treker vs. Vizium: Treker is positioned as a superior alternative to Vizium, an older technology, due to Treker's true single-cell resolution, higher sensitivity, and clearer, discrete clustering of cell types, which simplifies data interpretation.
33:49 Future Developments: Takara Bio is actively working towards compatibility with DNA sequencing.