Spatial Atlasing: Why Sensitivity Is the Real Frontier

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Cell atlasing efforts rest on a deceptively simple premise: To understand a tissue, you must find every cell in it, including the rare populations and transitional states whose biology is often the most clinically meaningful.

This is where atlasing gets hard. Throughput is no longer the bottleneck. Sensitivity is. A platform that captures only a fraction of transcripts per cell fails to detect lower-abundance populations that define an atlas’s resolution and utility.

A liver atlas that rewrites human zonation

A recent Nature study by Yakubovsky and colleagues at the Weizmann Institute illustrates what sensitivity makes possible. They built a spatial atlas of the healthy human liver from live donors, avoiding the transcriptomic distortions of deceased or adjacent-normal tissue, and used the MERSCOPE^® Platform with a 500-gene panel to validate cellular zonation at single-molecule resolution.

What they found reshapes a long-standing model of liver biology. Hepatocyte functions long thought to be periportal in mammals, key urea cycle enzymes (OTC, NAGS, ASL), the gluconeogenic gene PCK2, and the master transcription factor HNF4A, are pericentrally zonated in humans. Kupffer cell localization is also inverted relative to mouse: in humans, these macrophages are enriched in the pericentral zone. None of this would have surfaced without high-sensitivity spatial transcriptomics.

“MERSCOPE allowed us to validate zonation programs at single-molecule resolution. That sensitivity was essential to a reference atlas we could trust,” said Shalev Itzkovitz, PhD, an assistant professor at Weizmann Institute of Science and lead author on the Nature paper.

MERFISH 2.0:  built for the cells that might be missed

MERFISH 2.0 offers improvements to per-cell transcript capture and signal-to-noise that expand the dynamic range over which low-abundance transcripts and rare cell types become reliably detected. Early disease states, transitional progenitors, sparse immune subsets, and niche stromal cells move firmly into the resolved fraction of the atlas.

“When we set the design goals for MERFISH 2.0, the question we kept coming back to was: what are users still missing? Throughput wasn’t the answer, sensitivity was. Lowly expressed genes, and rare cells are where the most important biology often lives, and MERFISH 2.0 makes sure that rare events stop being the ones that get away,” said Jiang He, PhD, Co-founder and VP of Reagents, Vizgen.

Why MERSCOPE Ultra Platform is the spatial atlas platform

Besides sensitivity, atlases also require tissue areas large enough to capture biological context and analytical flexibility to interpret what is found. Four capabilities of the MERSCOPE Ultra Platform combine to produce atlas-grade data:

Three cm² imaging area. Larger sections, multi-region samples, and cohort-scale studies without registration artifacts or sampling bias.

MERFISH 2.0 sensitivity.  MERFISH 2.0 ensures rare populations and rare transcripts are accurately resolved.

Tissue clearing. Many informative atlasing tissues, liver, brain, dense tumor samples, are optically challenging. Clearing reduces autofluorescence and scattering, preserving single-molecule signal across the full section thickness.

Customizable segmentation and analysis. MERSCOPE’s pipeline lets researchers tune cell boundary detection and adapt clustering to the biology.

Getting to MERFISH 2.0 quickly

MERSCOPE Pre-designed Panels with Add-on capabilities give researchers a direct path: Existing instruments remain compatible, and labs can apply the enhanced chemistry to projects already in progress. More than 20 validated Pre-designed Panels span human biology, oncology, and dedicated mouse studies.

The atlasing moment

The Human Cell Atlas and disease-focused atlasing efforts are moving from pilot to production scale, and the atlases built now will be cited and expanded on for years. The question is whether a platform finds the cells that matter most: the ones that change everything when you finally see them.

“Cell atlases need more than cell-type identity. Spatial technologies like the MERSCOPE Platform are how we add location and function to that picture, and that context is what makes an atlas useful for understanding tissue biology, not just cataloguing it,” said Liat Alyagor, PhD, head of immunohistochemistry, Weizmann Institute of Science.

That is the standard MERSCOPE Ultra was built to meet.

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