Scientists Discover Why the Human Brain Is Unique at the Cellular Level

The human brain is an astonishingly complex organ that enables many unique abilities and behaviors not seen in other animals. For centuries, scientists have sought to understand what makes the human brain special and how it develops throughout life.

Recent technological and experimental advances have opened new opportunities in neuroscience, allowing researchers to create increasingly detailed descriptions of the brain and its processes. These efforts are helping to improve understanding of the mechanisms underlying various neuropsychiatric and neurodevelopmental disorders.

Researchers from Beijing Normal University, the Changping Laboratory, and other institutions compared brain development in humans and macaques using genetic and molecular approaches. Their work, published in Nature Neuroscience, showed that the human prefrontal cortex develops more slowly than that of macaques.

The scientists collected prefrontal cortex tissue samples from children with epilepsy (during planned surgeries) and from macaques at different postnatal stages. They examined gene expression in individual cells, chromatin accessibility, and the spatial distribution of genes in tissues using spatial transcriptomics.

The analysis revealed that in humans the prefrontal cortex undergoes a longer developmental period, while glial progenitors—cells that give rise to glial cells—divide more actively than in macaques. In addition, the researchers identified cell types and developmental lineages that are most vulnerable to neurodevelopmental and neuropsychiatric disorders, showing human-specific patterns of transcription factor expression.

The team also discovered regulatory programs unique to humans that extend postnatal cortical maturation through coordinated development of neurons and glial cells. These findings help explain differences between the human brain and those of other primates and may shed light on molecular processes disrupted in specific disorders.

In the future, the results of this study could contribute to a deeper understanding of human brain development and lead to new strategies for the prevention and treatment of neurodevelopmental and neuropsychiatric diseases.