Researchers at Karolinska Institutet have mapped how genetic activity is controlled in individual cells of the adult human brain and spinal cord, revealing that oligodendroglia – cells responsible for the brain’s insulating myelin – retain an “epigenetic memory” of their developmental origins long after those genes cease active expression. The study, published today in Nature Neuroscience, utilized advanced epigenomic technologies to analyze hundreds of thousands of cells across the central nervous system.
The research team employed single-nucleus ATAC sequencing and a dual histone profiling method called nanoCUT&Tag to achieve this detailed mapping. These techniques allowed them to examine chromatin accessibility and histone modifications at single-cell resolution, providing insights into the mechanisms governing gene activation and repression. According to corresponding author Professor Gonçalo Castelo-Branco, of the Department of Medical Biochemistry and Biophysics at Karolinska Institutet, “Having both chromatin accessibility and histone-level information at single‑cell resolution helps understanding the logic of gene activation and repression in the adult human brain.”
Inside cells, DNA is packaged with histone proteins, and whether a gene is active depends on the openness of this packaging and chemical modifications to the histones. The study identified a previously unknown DNA region involved in this regulatory process. This discovery builds upon earlier perform that created detailed maps of brain development, tracking stem cells as they differentiate into neurons and supporting cells, as reported in November 2025 by researchers who published a collection of papers in Nature. That earlier research captured molecular events during embryonic development and early life with unprecedented precision.
Related research, published in October 2025, focused on mapping human brain cell type origins and diseases through single-cell transcriptomics, further highlighting the growing field of cellular mapping. The Karolinska Institutet study adds to this body of knowledge by focusing specifically on the epigenetic mechanisms at play in the adult brain. Scientists have also recently completed the largest wiring diagram and functional map of the brain to date, according to the Allen Institute, revealing functional principles and a new way to classify cells.
The findings could have implications for understanding neurological disorders and developing targeted therapies. The retention of developmental programs within oligodendroglia suggests a potential for manipulating these epigenetic memories to promote myelin repair or regeneration, though further research is needed to explore these possibilities.
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