First 3D single-cell map of the lamprey brain traces the origin of vertebrate brains
New CapabilitiesA jawless 'living fossil' fish reveals that the common ancestor of all backboned animals already had a regionalized brain 500 million years ago
June 18th, 2026: First 3D single-cell lamprey brain atlas publishedNew here? Follow stories to track developments over time. Create a free account to get updates when stories you care about change.
Overview
Updated Jun 18Scientists have built the first three-dimensional, single-cell map of an entire lamprey brain. The atlas sorts the brain into 14 regions and 209 cell clusters, giving researchers a reference for how the earliest vertebrate brains were wired.
The lamprey is a jawless fish whose lineage split from ours about 500 million years ago. Its brain is the closest living stand-in for the ancestor of all backboned animals. The map shows that ancestor already had a brain divided into distinct regions, which changes where scientists draw the starting line for vertebrate brain complexity.
Why it matters
It pushes the origin of a regionalized, organized brain back to the dawn of vertebrates, giving researchers a shared baseline for comparing how every animal brain, including ours, was built.
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Timeline
February 2022 June 2026
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First 3D single-cell lamprey brain atlas published
Latest ResearchScience publishes a three-dimensional, single-cell atlas of the whole lamprey brain: 14 regions and 209 cell clusters, dating a regionalized brain to the vertebrate ancestor.
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First lamprey neural cell type atlas published
ResearchNature Ecology & Evolution publishes a single-cell lamprey neural atlas mapping cell types but not their full 3D positions.
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Preprint reconstructs the ancestral vertebrate brain
ResearchResearchers post a bioRxiv preprint reconstructing the ancestral vertebrate brain from a lamprey neural cell type atlas.
Historical Context
3 moments from history that rhyme with this story — and how they unfolded.
Human Genome Project completed (2003)
An international consortium finished a reference sequence of the human genome after 13 years. It gave biologists a shared map of roughly 20,000 genes. The data was released publicly for any researcher to use.
Labs worldwide began aligning their work to a common reference, speeding gene discovery.
The reference genome became the backbone of modern genetics, from disease research to evolution studies.
Like the genome, a single shared reference map changes a field by giving everyone the same baseline to compare against. The lamprey atlas aims to be that baseline for early brain evolution.
Earlier lamprey neural cell type atlas (2023)
A team published a single-cell atlas of lamprey neural cell types in Nature Ecology & Evolution. It cataloged the cell types of a jawless fish to reconstruct ancestral vertebrate traits. It did not place every cell in three dimensions.
Researchers gained a cell-type inventory for the lamprey nervous system.
It set up the comparison framework the 2026 3D atlas now extends.
This is the direct predecessor. The 2026 study adds spatial position, turning a parts list into a 3D map of where each cell type sits.
First fruit fly brain connectome (2024)
Researchers published the complete wiring diagram of an adult fruit fly brain, mapping about 140,000 neurons and 50 million connections. It was the most complete brain map of any animal at the time. The data was made openly available.
Neuroscientists gained a full circuit map to test theories of how brains compute.
It set a template for whole-brain mapping projects in larger animals.
Both projects turn a whole brain into a queryable dataset. The lamprey atlas adds the evolutionary angle: not just how a brain is built, but how brains came to be built that way.
