New Myelin Maps Boost Insight Into Nerve Disorders

Johns Hopkins scientists create detailed 3D maps of oligodendrocytes, the cells that form myelin and support brain health.

Published on Feb. 21, 2026

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Researchers at Johns Hopkins University have used 3D imaging, specialized microscopes, and artificial intelligence to construct new maps of the mouse brain showing the precise location of over 10 million oligodendrocytes - the cells that form the protective myelin sheath around nerve cell axons. These maps provide insights into how the loss of oligodendrocytes impacts diseases like multiple sclerosis, Alzheimer's, and other disorders affecting learning, memory, senses, and movement.

Why it matters

The new maps not only show the location of oligodendrocytes throughout the brain, but also integrate information about gene expression and neuron structure. This provides a comprehensive view of the brain's 'myelin ecosystem' and how it varies across different brain regions, which could lead to a better understanding of how myelin supports healthy brain function and what goes wrong in diseases that affect it.

The details

The researchers developed a novel pipeline involving tissue clearing, light-sheet microscopy, and machine learning to rapidly scan and catalog over 10 million oligodendrocytes per mouse brain. The maps charted oligodendrocyte positions at different ages, revealing that while overall oligodendrocyte and myelin formation increased with age, the rate varied dramatically between brain regions. Areas that process sensory information had three times more oligodendrocytes than motor cortex. In mouse models of myelin damage and Alzheimer's, the maps identified regions of higher vulnerability and resilience, which could yield insights for preserving myelin in disease.

  • The maps were published online on February 18, 2026 in the journal Cell.
  • The data was collected from mouse brains at ages ranging from 2 months to 2 years old.

The players

Dwight Bergles

The Diana Sylvestre and Charles Homcy Professor in the Department of Neuroscience at the Johns Hopkins University School of Medicine, and the senior author of the study.

Yu Kang T. Xu

A Ph.D. student and Kavli Neuroscience Discovery Institute fellow, and the first author of the study.

Johns Hopkins University

The institution where the research was conducted.

National Institutes of Health

The funding source for the research.

Chan Zuckerberg Initiative

An additional funding source for the research.

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What they’re saying

“Our study identifies not only the location of oligodendrocytes in the brain, but also integrates information about gene expression and the structural features of neurons. It's like mapping the location of all the trees in a forest, but also adding information about soil quality, weather and geology to understand the forest ecosystem.”

— Dwight Bergles, The Diana Sylvestre and Charles Homcy Professor in the Department of Neuroscience at the Johns Hopkins University School of Medicine (Mirage News)

What’s next

The researchers plan to use this approach to study how different life experiences, such as stress, social interaction, and learning, affect the patterns of oligodendrocyte and myelin formation in the brain.

The takeaway

These detailed 3D maps of oligodendrocyte distribution and myelin patterning across the mouse brain provide a powerful new tool for understanding the role of myelin in supporting healthy brain function, as well as uncovering the mechanisms behind myelin-related neurological disorders.