# Spatial epigenomics Mapping chromatin accessibility, DNA methylation and histone marks directly on a tissue section instead of a dissociated cell suspension, using in situ Tn5 transposition and microfluidic barcoding to build 3D atlases of a tumor's epigenetic state at 10-micron resolution — the layer of hardware and reagents beneath precision oncology's biggest 2026 push. Source: https://en.bioecon.ru/technology/spatial-epigenomics/ Updated: 2026-08-18 ## Overview and value chain Markers: [EC: In Vitro Diagnostic Regulation (IVDR) Class C | OECD: Genomics & bioinformatics | Regulator: FDA (US), EMA (EU), NMPA (China)] Spatial epigenomics maps the epigenetic landscape — chromatin accessibility, DNA methylation and histone modifications — while preserving the spatial architecture of the tissue under study. Traditional bulk or even single-cell ATAC-seq requires fully dissociating tissue into individual cells, a step that destroys information about cell-to-cell positioning, oxygen gradients and spatial interactions. Preserving a spatial map of histone methylation marks (H3K4me3 marking active promoters, H3K27me3 marking silenced regions) reveals how cells shift phenotype under the influence of neighboring cells or therapeutic drugs — directly relevant to studying tumor cell subpopulations and their microenvironment. Following Bruker's 2024 acquisition of NanoString's spatial biology business, the CosMx platform now images the whole transcriptome at single-cell resolution via a 6,000-plex RNA assay, while Vizgen's newly launched MERFISH 2.0 chemistry and enhanced OmniVue panels extend spatial multi-omics with ADC biomarker capability. Innovative spatial barcoding methods — Spatial ATAC-seq, Spatial CUT&Tag, and multiplexed fluorescent in situ hybridization (FISH) — are the technical core of the field. The key directions of spatial epigenomics are: 1. **Deterministic tissue barcoding in microchannels (DBiT-seq):** flowing unique oligonucleotide barcodes through mutually perpendicular microchannels laid over a tissue section, creating a 2D coordinate grid (X, Y) at resolution down to 10 microns. 2. **Spatial Tn5 transposition:** using modified Tn5 transposase to simultaneously fragment open chromatin and ligate adapters directly inside cell nuclei on a tissue section. 3. **Spatial CUT&Tag and CUT&RUN:** antibody-guided, in situ tethering of Tn5 or micrococcal nuclease to specific histone marks, mapping their genome-wide distribution while preserving tissue coordinates. 4. **3D epigenetic atlas reconstruction:** bioinformatic integration of coordinate-tagged sequencing reads with tissue histology images to generate three-dimensional maps of chromatin state across an organ or tumor. ### Sectoral value chain ``` [Cryosection tissue preparation (10 µm)] ──> [In situ Tn5 transposition with spatial barcode] ──> [DNA library collection off slide] │ [Bioinformatic spatial reconstruction] <─── [High-throughput sequencing (NGS)] <┘ ``` ### Value chain levels | Level | Description | Key inputs/outputs | |:---|:---|:---| | **Sample preparation** | Freezing tissue in OCT medium and cryosectioning to 10 µm thickness on a cryostat. | **In:** Fresh-frozen tissue, OCT embedding medium.
**Out:** Mounted tissue cryosections. | | **Fixation and permeabilization** | Mild formaldehyde fixation and detergent treatment to allow protein access to nuclei. | **In:** Mounted section, fixative, detergent.
**Out:** Permeabilized tissue section ready for transposition. | | **In situ transposition** | Applying recombinant Tn5 transposase, which enters cell nuclei and inserts adapters at open, nucleosome-free DNA regions. | **In:** Permeabilized section, Tn5 transposase, oligo adapters.
**Out:** Tagged, fragmented open-chromatin DNA in situ. | | **Coordinate barcoding** | Overlaying a microfluidic chip that flows barcode set A along one channel direction (X coordinate), then rotating 90° to flow barcode set B (Y coordinate) with ligase. | **In:** Tagged section, microfluidic barcoding chip, ligase.
**Out:** Spatially barcoded DNA library on the slide. | | **Sequencing** | Releasing DNA from the slide, purifying on magnetic beads, PCR-amplifying and sequencing on high-throughput instruments. | **In:** Barcoded DNA, magnetic beads, PCR reagents.
**Out:** Raw sequencing reads tied to spatial coordinates. | | **Methylome/epigenome reconstruction** | Bioinformatic mapping of sequencing reads to the coordinate grid, visualized over the section's histology image. | **In:** Raw reads, coordinate map, histology image.
**Out:** Spatial chromatin-accessibility/epigenome map. | Cross-cutting technologies of the sector: - **Deterministic barcoding in tissue (DBiT-seq):** flowing unique oligonucleotide barcodes through mutually perpendicular microchannels over a tissue section, generating a 2D coordinate grid at resolution down to 10 microns. - **Spatial Tn5 transposition:** a modified Tn5 transposase that simultaneously fragments open chromatin and ligates adapters directly inside cell nuclei on a tissue section, rather than in a dissociated-cell suspension. - **Multiplexed spatial imaging platforms:** commercial imaging-based spatial platforms (CosMx, MERFISH/MERSCOPE) that read thousands of RNA and protein targets directly on an intact tissue section at subcellular resolution. --- ## US The United States holds global leadership in patenting and commercializing spatial analysis systems, with major platform vendors headquartered domestically and funded by large federal genomics programs. ### NanoString's CosMx (now under Bruker), Vizgen's MERFISH 2.0, EpiCypher's CUT&Tag/CUT&RUN reagents - **NanoString's CosMx under Bruker Spatial Biology:** following Bruker's 2024 acquisition of NanoString's spatial biology assets, the CosMx Spatial Molecular Imager achieved whole-transcriptome imaging at single-cell resolution and launched a 6,000-plex RNA assay, extending the platform's reach from targeted panels toward genome-wide spatial profiling. - **Vizgen's MERFISH 2.0 and OmniVue expansion:** Vizgen launched MERFISH 2.0 chemistry and enhanced OmniVue panels with antibody-drug-conjugate (ADC) biomarker capability in 2026, alongside a spatial multi-omics roadmap unveiled at AGBT 2026 and new volumetric tissue-mapping capability presented at the Human Cell Atlas 2026 meeting. - **EpiCypher's CUT&Tag/CUT&RUN reagent platform:** EpiCypher supplies the CUTANA line of CUT&Tag and ChIC/CUT&RUN kits, SNAP-certified histone-mark antibodies, and multiomic CUT&RUN assays that many academic and commercial spatial-epigenome workflows build on for antibody-guided chromatin profiling. - **Federal research funding:** large grants from the National Human Genome Research Institute (NHGRI) and the NIH's Human Biomolecular Atlas Program (HuBMAP) fund much of the underlying spatial-omics method development. --- ## CN China has bet on independent, subcellular-resolution spatial sequencing hardware, anchored by BGI Group's Stereo-seq platform, and applies spatial epigenomics to developmental and stem-cell atlases. ### BGI's Stereo-seq platform adapted for Spatial CUT&Tag, developmental atlas projects in Shanghai and Beijing - **BGI's Stereo-seq DNA nanoball chip platform:** BGI Group's Stereo-seq — spatially resolved transcriptomics on DNA nanoball chips — is being actively adapted for epigenetic applications (Spatial CUT&Tag), giving China a domestically developed alternative to the imaging-based US platforms. - **Developmental and stem-cell atlas projects:** Chinese academic centers in Shanghai and Beijing use spatial epigenomics to build detailed embryo-development atlases and map plant stem-cell architecture, though independent 2025-2026 confirmation of a specific commercial vendor beyond BGI's own platform could not be established within the current search — the domestic commercial-vendor landscape outside BGI is best described qualitatively pending stronger public disclosure. - **NMPA oversight:** spatial diagnostic applications intersecting clinical use fall under China's National Medical Products Administration framework, alongside the broader precision-medicine regulatory push. --- ## EU The European Union leads in developing bioinformatic algorithms for spatial alignment and multi-omic data integration, alongside emerging commercial spatial biology hardware makers. ### Lunaphore's COMET platform, EU standardization of sample-prep protocols, IVDR Class C oversight - **Lunaphore's COMET multiomics platform:** the Swiss company's COMET platform performs fully automated, same-section, high-throughput hyperplex spatial biology, positioned by the company as paving the way for spatial biology's adoption in clinical research rather than research-only use. - **Protocol standardization push:** European projects focus heavily on standardizing sample-preparation Standard Operating Procedures (SOPs), critical for reproducibility when spatial epigenomic results feed into clinical trials of new pharmaceutical candidates. - **IVDR Class C oversight:** as spatial platforms move toward clinical diagnostic use, they fall under the EU's In Vitro Diagnostic Regulation as Class C devices, requiring rigorous validation of reproducibility across sites and operators. --- ## Leading companies and research institutes | Company / Institute | Country | Key products / platforms | Tech features | Status 2026 | |:---|:---|:---|:---|:---| | **NanoString Technologies** | 🇺🇸 USA | *CosMx* Spatial Molecular Imager (now under Bruker) | Whole-transcriptome imaging at single-cell resolution, 6,000-plex RNA assay | operating | | **Vizgen** | 🇺🇸 USA | *MERFISH 2.0*, *MERSCOPE Ultra*, *OmniVue* panels | Ultra-sensitive imaging-based spatial transcriptomics, ADC biomarker panels | commercial | | **EpiCypher** | 🇺🇸 USA | *CUTANA* CUT&Tag / ChIC-CUT&RUN kits | SNAP-certified histone-mark antibodies, multiomic CUT&RUN assays | commercial | | **Lunaphore Technologies** | 🇨🇭 Switzerland | *COMET* multiomics platform | Fully automated, same-section, high-throughput hyperplex spatial biology | commercial | --- ## Tech stack and innovations ### 1. Molecular stack and biological agents - **Tn5 transposase:** ultra-purified recombinant protein with high in situ DNA fragmentation and ligation activity. - **Validated histone-modification antibodies:** monoclonal antibodies against H3K4me3 (active-promoter marker), H3K27me3 (silencing marker) and H3K27ac (active-enhancer marker). - **Diffusion modeling of Tn5 in tissue:** predictive models of Tn5 concentration through the depth of a tissue section, accounting for effective diffusion through fixed cytoplasm and nuclear membrane along with first-order binding kinetics to open chromatin — used to optimize enzyme incubation time and concentration for uniform tagging depth. ### 2. Instrument stack and analytical equipment - **High-throughput sequencers:** Illumina NovaSeq 6000, MGI DNBSEQ-T7. - **Microfluidic barcoding stations:** DBiT-seq-class platform systems with pressure control. - **High-precision cryostats:** instruments such as the Leica CM3050 S for producing smooth, tear-free tissue sections. - **Integration software:** Seurat's Spatial module, Scanpy and Squidpy for joint spatial analysis of metabolic and epigenetic tracks. --- ## Value chains and production pipelines ### Industrial-laboratory pipeline for Spatial ATAC-seq ``` ┌───────────────────────────┐ ┌───────────────────────────┐ │ 1. Freeze tissue in OCT & │ ───> │ 2. Mount section & fix on │ │ cryosection (10 µm) │ │ poly-L-lysine slide │ └───────────────────────────┘ └───────────────────────────┘ │ ▼ ┌───────────────────────────┐ ┌───────────────────────────┐ │ 4. Generate 2D barcode grid│ <─── │ 3. In situ Tn5 transposition│ │ via microfluidics │ │ with oligo adapters │ └───────────────────────────┘ └───────────────────────────┘ │ ▼ ┌───────────────────────────┐ ┌───────────────────────────┐ │ 5. Collect DNA library, │ ───> │ 6. Bioinformatic coordinate │ │ PCR-amplify & sequence │ │ mapping & visualization │ └───────────────────────────┘ └───────────────────────────┘ ``` #### Stage 1: Sample preparation Fresh-frozen tumor tissue is embedded in OCT polymer medium and cut on a cryostat at -20°C into 10 µm-thick sections. #### Stage 2: Fixation and permeabilization Sections are mounted on specialized slides. Mild formaldehyde fixation followed by detergent treatment (Triton X-100) opens access for proteins to reach cell nuclei. #### Stage 3: Chromatin transposition Recombinant Tn5 transposase is applied to the section, penetrating cell nuclei and inserting adapters precisely at open, nucleosome-free DNA regions. #### Stage 4: Coordinate barcoding A polymer microfluidic chip is overlaid on the section. Barcode set A oligonucleotides (X coordinate) flow through a first channel system; the chip is then rotated 90 degrees and barcode set B (Y coordinate) is introduced through a second channel system with ligase. #### Stage 5: Sequencing DNA is released from the slide, purified on magnetic beads and PCR-amplified to prepare a library for high-throughput sequencing on Illumina or MGI instruments. #### Stage 6: Methylome reconstruction The bioinformatic pipeline maps sequenced DNA reads to the coordinate grid and visualizes the chromatin-accessibility map overlaid on the section's histology photograph.