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First 3D single-cell map of the lamprey brain traces the origin of vertebrate brains

First 3D single-cell map of the lamprey brain traces the origin of vertebrate brains

New Capabilities

A 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 published

Overview

Updated Jun 18

Scientists 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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Key Indicators

209
Cell clusters mapped
Distinct cell types identified across the whole lamprey brain.
14
Brain regions
Separate anatomical regions delineated in the 3D atlas.
~500M years
Age of the common ancestor
Roughly when the vertebrate ancestor with a regionalized brain lived.
0
Myelin genes in lamprey
Lamprey lacks the master genes for myelin-making cells, which arose later in jawed vertebrates.

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People Involved

Haixu Wu
Haixu Wu
Lead author of the 2026 Science study
Published the first 3D single-cell lamprey brain atlas
 Marianne Bronner
Marianne Bronner
Developmental biologist, earlier lamprey atlas work
Authored a 2023 lamprey neural cell type atlas that preceded the 3D map

Organizations Involved

Science Corporation
Science Corporation
Scientific journal
Published the 2026 lamprey brain atlas

Science is the flagship peer-reviewed journal of the American Association for the Advancement of Science.

Timeline

February 2022 June 2026

3 events Latest: June 18th, 2026 · 3 months ago

  1. First 3D single-cell lamprey brain atlas published

    Latest Research

    Science 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.

  2. First lamprey neural cell type atlas published

    Research

    Nature Ecology & Evolution publishes a single-cell lamprey neural atlas mapping cell types but not their full 3D positions.

  3. Preprint reconstructs the ancestral vertebrate brain

    Research

    Researchers post a bioRxiv preprint reconstructing the ancestral vertebrate brain from a lamprey neural cell type atlas.

Scenarios

1

Other labs adopt the lamprey atlas as a standard reference

Likely Resolves by End of 2027

Discussed by: Evolutionary neuroscience groups citing the Science paper

The dataset becomes a common comparison point. Within 18 months, multiple independent studies use the lamprey atlas to anchor cross-species brain comparisons, citing it as a reference map. This is the path the authors and prior atlas work point toward, since shared references are how cell-type biology usually advances.

2

Cerebellum and myelin-cell origin claims get an independent test

Possible Resolves by Q2 2028

Discussed by: Comparative neuroanatomy and glial-biology researchers

The atlas argues the ancestral brain lacked cerebellar cell types and myelin-making oligodendrocytes, which it says arose later in jawed vertebrates from astrocyte-like precursors. A separate research group sets out to test this. By the deadline, a peer-reviewed study either supports or disputes the timing of oligodendrocyte origin.

3

The atlas data is released as a public browsable resource

Likely Resolves by Q2 2027

Discussed by: Open-data and bioinformatics communities

Cell atlases usually ship with an online portal so other scientists can query cell types and regions. A public, browsable version of the lamprey brain atlas goes live, with the raw sequencing data deposited in a recognized repository. This is a near-routine step for atlas papers in major journals.

Historical Context

3 moments from history that rhyme with this story — and how they unfolded.

April 2003

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.

Then

Labs worldwide began aligning their work to a common reference, speeding gene discovery.

Now

The reference genome became the backbone of modern genetics, from disease research to evolution studies.

Why this matters now

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.

September 2023

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.

Then

Researchers gained a cell-type inventory for the lamprey nervous system.

Now

It set up the comparison framework the 2026 3D atlas now extends.

Why this matters now

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.

October 2024

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.

Then

Neuroscientists gained a full circuit map to test theories of how brains compute.

Now

It set a template for whole-brain mapping projects in larger animals.

Why this matters now

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.

Sources

(3)
Science Nature Ecology & Evolution bioRxiv