Stanford researchers who previously showed human brain organoids could survive and function inside baby mice have now genetically engineered mice so their own brains don't fully develop, allowing human tissue to fill the gap more extensively. The approach aims to create better models for studying brain injury and development, while forcing the team to set explicit ethical limits on how far the chimeric brain research should go.
technologyreview.com
· 2026-09-17
A Stanford research team removed a large section of a mouse's brain and replaced it with tissue grown from human stem cells known as brain organoids. The goal was to give these lab-grown clusters of neurons a living, connected environment closer to an actual brain than a petri dish can offer.
arstechnica.com
· 2026-09-16
A Stanford team led by Sergiu Pașca genetically engineered mice to lack most of their cortex and hippocampus, then implanted human brain organoid cells into the resulting gap. The human cells expanded to fill much of that space within weeks to months, and mice with the human tissue performed better on memory maze tests than mice without it.
technologyreview.com
· 2026-09-16
Researchers engineered mice with genetically depleted cortical tissue using Emx1-cre and Esco2 conditional knockout lines, then implanted human-derived brain organoids grown from induced pluripotent stem cells into the resulting cavity. The organoids were produced by aggregating dissociated hiPS cells in microwell plates and guiding them through early neural differentiation with dorsomorphin and SB-431542 before transplantation.
nature.com
· 2026-09-16
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