Deep inside the human brain, in a cluster of structures that shape movement, habit, motivation and choice, researchers at the University of California, Irvine have now drawn a map of roughly eight million cells, sorting them into sixty kinds and showing how they gather into neighborhoods. Such maps are slow, patient acts of reckoning: before we can understand how a disease unsettles the brain, we must first know what a healthy neighborhood looks like. Published in Cell as part of a wider international effort to chart the brain, the work offers a reference point for conditions like Parkinson's
Spatial Mapping of 8 Million Brain Cells Gives Researchers a New Reference for the Basal Ganglia
Knowing which cells exist is only part of the story
Mark
Eight million cells and 60 types. What is actually new here, beyond the size?
Mimi
Location. Standard sequencing tells you what a cell is but strips away where it was. This work kept the position, so they could see which cells sit together.
Mark
And what did the positions show?
Mimi
Supporting cells lined up along borders between compartments, and certain primate-abundant neurons appeared only in particular compartments.
Luke
Worth noting the sample: four neurotypical donors. That's a small number of people behind 8 million cells.
Mark
So the scale is cells, not people.
Luke
Right. The source doesn't say how much donor-to-donor variation there is, so I wouldn't assume the map generalizes cleanly yet.
Mimi
The second paper touches that, in a way. It says recruiting donors who reflect Southern California's population is a challenge.
Mark
Does this help patients with Parkinson's or Huntington's now?
Luke
No. The reporting says clinical value depends on follow-up studies. The disease angle is a stated purpose, not a result.
Mimi
The hoped-for use is comparing healthy and diseased tissue, asking why some cells are vulnerable and others resistant.
Luke
And Xu's Human Genome Project comparison is his own framing of long-term potential, not something already demonstrated.
O Pulso
- Roughly eight million cells have been placed on a map, yet the unanswered question is how their arrangement changes when disease arrives.
- Standard single-cell methods strip cells from their surroundings, so the team kept their locations intact to reveal who lives beside whom.
- Four donor brains and a coordinated network of coroners, body programs and tissue recovery groups make the work possible, and the donor pool still falls short of Southern California's diversity.
- The atlas is now a baseline for comparing healthy and diseased tissue, and its clinical promise waits on follow-up research linking anatomy, activity and disease.
Deep inside the human brain, in a cluster of structures that shape movement, habit, motivation and choice, researchers at the University of California, Irvine have now drawn a map of roughly eight million cells, sorting them into sixty kinds and showing how they gather into neighborhoods. Such maps are slow, patient acts of reckoning: before we can understand how a disease unsettles the brain, we must first know what a healthy neighborhood looks like. Published in Cell as part of a wider international effort to chart the brain, the work offers a reference point for conditions like Parkinson's and Huntington's, though its true worth will be measured by the studies that follow.
At the University of California, Irvine, researchers have mapped about eight million cells from the basal ganglia, the deep brain region that helps govern movement, motivation, habits and decisions. They sorted these cells into 60 distinct types and showed how they cluster into communities. The team calls the result a foundational reference for studying Parkinson's disease, Huntington's disease and other neurological and psychiatric conditions.
The method is central to the achievement. Earlier single-cell sequencing could identify cell types by their gene activity, but it generally removed cells from their original positions and lost the context of their neighbors. The Irvine team combined two spatial technologies to measure gene activity while tracking where each cell sat in tissue, drawing on samples from four neurotypical donors. As senior investigator Xiangmin Xu put it, knowing which cells exist is only part of the story; one must also know where they are, who their neighbors are, and how they are organized.
The maps revealed that cell types occupy distinct territories, that some supporting cells line the borders between compartments, and that certain neurons more common in primates appear only in specific regions. The atlas is a research resource rather than a clinical tool. Its value lies in helping scientists ask why some cell populations succumb to disease while others resist, and whether their neighbors play a role.
Behind the atlas stands a second study in Cell Systems describing how donated human brain tissue is obtained, prepared and documented, working with the Orange County Coroner's Office, UC Irvine's Willed Body Program and other partners. That paper also notes the difficulty of recruiting donors who reflect the region's population.
The work is part of BICAN, a multinational project launched in 2022 that brings together hundreds of scientists from 55 institutions to build shared standards for comparing brain cells across species. Xu sees the broader ambition as comparable in scope to the Human Genome Project, and the next step at Irvine is to connect these molecular maps with studies of anatomical connections, cell activity and disease change.
Researchers at the University of California, Irvine have placed roughly 8 million cells from deep inside the human brain onto a map, sorting them into 60 distinct types and showing how those cells gather into communities. The region is the basal ganglia, a set of interconnected structures involved in movement, motivation, habits and decision-making. The team describes the result as a foundational reference for studying Parkinson's disease, Huntington's disease and other neurological and psychiatric disorders.
The work was published in Cell. It is one of two studies led by UC Irvine's Center for Neural Circuit Mapping as part of a coordinated publication package from the BRAIN Initiative Cell Atlas Network, known as BICAN. The university's team also contributed to four other Cell papers on the molecular features of brain cells and how they compare across species. Xiangmin Xu, a chancellor's professor of anatomy and neurobiology in the School of Medicine and director of the center, directs the university's participation.
The method matters as much as the count. Single-cell sequencing has sharpened scientists' ability to tell brain cell types apart by their gene activity, but the process generally pulls cells out of their original positions and discards information about what surrounded them. The Irvine team used spatial transcriptomics, which measures gene activity while keeping track of where cells sit in tissue. By combining two technologies, MERFISH+ and Stereo-seq, they analyzed brain samples from four neurotypical donors and tied molecular cell identities to the anatomy of the basal ganglia. "Knowing which cells exist in the brain is only part of the story," Xu said, adding that researchers also need to know where cells are, which cells neighbor them and how they are organized within specific structures.
The maps showed that different cell types occupy distinct territories. Some supporting cells clustered along the borders between compartments. Certain kinds of neurons that are more abundant in primates turned up only within particular compartments. For Xu, the central advance is the ability to examine cellular communities, meaning the combinations of cells found together in a given place, which a plain list of cell types cannot reveal. UC Irvine researchers led the large-scale data generation, the computational analysis and the integration of molecular findings with anatomy. Bereket Tesfay Berackey, Zhiqun Tan, Ginny Wu and Sujan Das are among the major authors, and Bogdan Bintu, an assistant professor at UC San Diego, was a key collaborator on technology development, experimental design and data analysis.
The atlas is meant to serve as a baseline for comparing tissue from people with and without brain disorders. Researchers could use it to ask why some cell populations are vulnerable to disease while others stay relatively resistant, and whether neighboring cells help explain the difference. Over time that could support more precise experimental models and help identify potential therapeutic targets. The source is plain about the limits: the spatial atlas is a research resource, and its clinical value depends on the studies that follow.
The second UC Irvine-led study, in Cell Systems, covers the supply line behind the atlas: a coordinated program for obtaining, preparing and characterizing donated human brain tissue. Its primary authors are Jillian V. Berry, Bryan M. Tran, P. Adolfo Sequeira and Lorena Valenzuela. The paper lays out workflows linking donor identification and tissue recovery to the quality standards and anatomical documentation that advanced molecular work requires. The campus brain procurement program works with the Orange County Coroner's Office, UC Irvine's Willed Body Program, UCI Health—Orange, CHOC and OneLegacy, a Southern California organ, eye and tissue recovery organization. The paper also identifies difficulty recruiting donors who reflect Southern California's population and points to opportunities to widen outreach and donation pathways.
Xu said UC Irvine's distinctive contribution is connecting the whole process, from procuring and characterizing high-quality human tissue to spatial genomics and building detailed reference atlases.
The larger BICAN package brings together hundreds of scientists from 55 institutions in nine countries to create a common framework for categorizing and comparing basal ganglia cells across species, which helps researchers judge how findings in animal models relate to human biology. It also sets methods and standards meant to guide mapping of the rest of the brain. BICAN launched in 2022, and UC Irvine takes part through the Center for Multiomic Human Brain Cell Atlas project, alongside the Salk Institute, UC San Diego and Washington University in St. Louis.
Xu compares the long-term potential to the Human Genome Project, while noting that a brain atlas must integrate many kinds of molecular information with the intricate arrangement of cells and circuits. At Irvine, the next step is to link these molecular maps with studies of anatomical connections, cell activity and disease-related changes.
Citações Notáveis
Knowing which cells exist in the brain is only part of the story.— Xiangmin Xu, director, UC Irvine Center for Neural Circuit Mapping
We are building fundamental reference resources that can serve researchers for many years.— Xiangmin Xu
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