Atlas of 6.3 Million Brain Cells Maps Gene Shifts Across Lifespan and Disorders

Scientists led by Panos Roussos through the PsychAD Consortium released a single-cell atlas of gene activity in the human dorsolateral prefrontal cortex on Sept. 23, 2026. The nine studies analyzed more than 6.3 million cell nuclei from 1,494 donors aged from before birth to 108, covering diverse ancestries and diagnoses including 500 with Alzheimer’s disease, 112 with diffuse Lewy body disease, 85 with vascular dementia, 40 with Parkinson’s, 120 with schizophrenia and 55 with bipolar disorder. Comparing tissue across ages showed extensive developmental changes, relative stability through much of adulthood, and renewed shifts later in life especially in glial and immune cells. Data indicated most cell populations stabilize around age 24; Roussos said this does not mean the brain finishes developing or decline begins then. Clock-gene cycles reconstructed from donors who died at different times of day were weaker and less synchronized after 60. Shared pathways linked several neurodegenerative conditions, while individual Alzheimer’s profiles varied. Roussos said the map identifies vulnerable cell populations and can help narrow treatment targets. Jennifer Below called the work a herculean effort. The resource is publicly available as a reference for typical aging versus disease.