GoKawiilStanford team transplants human brain organoids into mice, restoring cortex function
Stanford University researchers led by Sergiu Pașca transplanted lab-grown human brain organoids into mice bred to lack most of their cerebral cortex. The transplanted tissue survived and formed functional connections to the animals' brains and spinal cords, according to a study published in Nature. The team describes it as the most extensive integration of human brain cells into an animal achieved to date.
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The advance could give scientists a new way to study conditions such as cerebral palsy and autism in a living nervous system and test potential treatments, something animal models and isolated organoids alone cannot fully provide. It also intensifies ethical questions about whether animals carrying substantial human neural tissue might acquire human-like traits of cognition or consciousness, prompting calls from researchers for stronger biosafety oversight and public and patient involvement in setting rules for this research.
- Stanford scientists transplanted human brain organoids into mice lacking most of their cortex, and the tissue formed working neural connections.
- The study is described as the most extensive human-mouse brain integration achieved so far, published in Nature.
- The result raises ethical questions about consciousness in chimeric animals, with calls for international oversight and public input.
Source: nature.com, 2026-09-29
Published there as: “Lab-grown brain organoids: time for international oversight”
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