Nature Breakthrough: Growing a Human Brain in Mice!
Release time:
2026-09-18
On September 16, a Stanford University research team published a breakthrough in Nature: they developed a mouse model with an almost completely absent cerebral cortex, freeing up enormous space for transplanted human brain organoids. These organoids not only survived and grew, but also established functional neural networks with the mouse brain and even extended into the spinal cord. This “xenocorticalization” technique provides an unprecedented living model for studying human brain development, the mechanisms of neurological disease, and potential therapies.
Breaking Spatial Limits: Giving Organoids Room to Develop
Transplanting human brain organoids into rodents has long been an important approach for exploring human neuronal function. However, the host cranial cavity has limited space, and mouse neurons develop faster and compete more strongly, making it difficult for transplanted organoids to fully integrate. This time, the Stanford team used a genetic strategy to specifically knock out the key gene (Esco2) in the “founder cells” of the mouse cerebral cortex, generating immunodeficient mice with only 2% of cortical tissue remaining. These “cortex-less” mice survived healthily, leaving a large cavity in the brain that became an “ideal host” for human brain organoids.
From Cells to Behavior: Organoids Truly Integrate
The researchers transplanted human brain organoids derived from healthy donors (each containing about 100,000 cells) into the brains of newborn “cortex-less” mice. Three months later, more than 90% of the mouse cerebral cortex was human-derived tissue. These human neurons not only differentiated into multiple brain cell types but also formed complex structures resembling the cerebral cortex and integrated with mouse neurons to produce functional brain circuits. Behavioral tests showed that the transplanted mice performed generally similarly to normal mice in motor and memory tasks, but hypoxia experiments revealed differences: after exposure to a low-oxygen environment, the transplanted mice showed gait instability similar to that of children with cerebral palsy, whereas ordinary mice and “cortex-less” mice were almost unaffected. This indicates that the model can sensitively reflect the pathological response of human brain tissue to hypoxia.
Unexpected Finding: Rare Neurons “Appear”
Even more surprising, von Economo neurons (VENs) appeared in the transplanted human brain tissue. These neurons are extremely rare, accounting for only one in 90,000 of all cerebral cortical neurons. They had previously been observed only in postmortem human brain tissue and had never appeared in in vitro culture or early transplantation experiments. VENs are associated with social awareness and decision-making and are unusually vulnerable in frontotemporal dementia. The new model allows scientists, for the first time, to generate and study these neurons in living animals, providing a completely new research platform for related neurological diseases.
The research team repeatedly emphasized that the experiments were conducted under strict ethical guidance. They called for simultaneously upgrading ethical frameworks to clarify the benefits, harms, and boundaries of consciousness potential of such models. As the Editor-in-Chief’s commentary put it: “The faster technology advances, the more humanity needs to maintain awe for its own creations, setting rules in advance rather than making remedies afterward.”
The model is expected to accelerate research on diseases such as schizophrenia, epilepsy, autism, and cerebral palsy. However, the road to clinical application remains long, and the dual-track advancement of ethics and science will be key to ensuring steady and sustained progress in this field.
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