Meet a mouse whose brain cortex is made up of human cells

Scientists at Stanford University have engineered mice whose cortex is largely composed of human brain cells. To achieve this, they genetically modified the rodents so that their cortex and hippocampus would not develop properly, creating enough space for human neural organoids grown in the lab to be implanted and to proliferate. After several weeks, almost half of the animal’s brain volume consisted of human tissue. The mice with this substitution displayed normal locomotion and vocalizations, though they showed memory deficits in maze tests. In contrast, the animals that received the human cells performed better on those same tests, suggesting that the human tissue confers some cognitive function to the organism.

Published in Nature, the study proposes that these “xenocortical mice” could serve as a model for studying brain injury and testing stem‑cell‑based therapies. At the same time, the research rekindles the ethical debate over mixing human tissue with animals, especially the possibility that, in species closer to humans, the boundaries between human and animal consciousness could blur. This issue is significant because it shapes the regulatory and moral frameworks that will guide the future of biotechnology and regenerative medicine.

Read the original article on MIT Technology Review

This summary is an informational synthesis produced by dataqbs.com. All rights to the original content belong to its author and the cited media outlet. We act solely as curators of technology news and claim no authorship.