Scientists figured out how to turn the brain's immune cells into brand-new, working neurons.
March 23, 2026
Original Paper
Neurogenin-2 Reprograms Human Microglial Lineage Cells into Neurons In Vitro and in Chimeric Brains
bioRxiv · 10.64898/2026.03.19.712907
The Takeaway
By activating a single master gene, researchers converted microglia—the brain's resident 'trash collectors'—into mature neurons that can fire electrical signals and form synapses. This conversion worked not only in laboratory dishes but also inside living brains, opening a radical new path for replacing lost brain cells using the body's own immune system.
From the abstract
Progressive neuronal loss is a hallmark of many neurological disorders, yet the adult human brain has a limited capacity for endogenous neuronal replacement. Direct neuronal reprogramming represents an alternative strategy for generating new neurons. Microglia, the brain resident immune cells, are uniquely positioned as candidate cellular substrates due to their abundance, self-renewal capacity, high motility, and rapid recruitment to sites of injury. Here, using live-cell imaging and electrophy