Scientists have produced the largest map to date of gene activity in the human prefrontal cortex, sequencing data from more than six million individual cells across almost 1,500 people to inform the study of neurodegenerative and psychiatric diseases in unprecedented detail, according to a collection of studies published in Nature and other journals.
Mapping Gene Activity in the Human Prefrontal Cortex
The landmark project provides a detailed look at gene activity within neurons, immune cells, and vascular cells in a critical region of the brain that manages planning, decision-making, and emotional regulation. According to Dr. Panos Roussos, director of the Center for Disease Neurogenomics at the Icahn School of Medicine at Mount Sinai in New York City, the work began in 2019 through the PsychAD Consortium—an NIH-funded partnership connecting genetic variation, aging, and disease to specific brain cells.
Did you know? The prefrontal cortex is located directly behind the forehead and forms the outer layer’s frontal region, making it highly vulnerable to age-related decline and neurological disorders.
Single-Cell Analysis Across 1,500 Brain Tissue Donors
To construct the map, researchers studied post-mortem brain tissue from 1,494 donors ranging from infancy to 108 years of age, representing diverse genetic ancestries. The tissue samples came from both neurotypical individuals and people diagnosed with eight distinct brain disorders, including Alzheimer’s disease, Parkinson’s disease, schizophrenia, bipolar disorder, vascular dementia, Lewy body dementia, tauopathy, and frontotemporal dementia.
Using single-cell RNA sequencing, the team recorded gene activity in the nuclei of more than 6.3 million individual cells. This method details the active RNA transcripts in a single cell at sampling time, giving scientists a precise view of cellular function and status across different disease states.
Shared Molecular Pathways in Neurodegenerative Diseases
Comparing tissue samples across conditions revealed strong similarities in gene activity among Alzheimer’s disease, Parkinson’s disease, vascular dementia, and Lewy body disease. According to research findings, these conditions share overlapping gene activity linked to nerve-cell development, neuronal communication, and blood-vessel biology. Investigators also uncovered shared pathways in microglia—the brain’s resident immune cells—specifically between Alzheimer’s and Parkinson’s diseases.
“A useful treatment needs to influence the right biological process in the right cells,” Roussos stated, noting that the map helps narrow down vulnerable cell populations and potential treatment targets.
Lifespan Development and Cortical Remodelling Phases
In a foundational study tracking healthy brains across human lifespans, researchers identified three distinct phases of cortical development in the dorsolateral prefrontal cortex. According to the findings, the brain undergoes a rapid remodelling phase during early life, achieves stability through midlife starting at age 24, and enters a second remodelling phase around age 65, particularly involving immune, stress-response, and circadian rhythm cells.
Frequently Asked Questions
What is the prefrontal cortex?
The prefrontal cortex is the front part of the brain’s outer layer located behind the forehead, responsible for working memory, executive function, decision-making, and emotional regulation.
How many cells were analyzed in this brain map?
Researchers recorded gene activity in more than 6.3 million individual brain cells sourced from nearly 1,500 deceased donors.
Which brain disorders were included in the research?
The study examined samples from people diagnosed with Alzheimer’s disease, Parkinson’s disease, schizophrenia, bipolar disorder, vascular dementia, Lewy body dementia, tauopathy, and frontotemporal dementia.
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