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Brain Organoids Live
Brain organoids, once limited to a few months of life, can now survive for years and age like real brains. These tiny tissue pieces, created from stem cells, mimic the earliest stages of human brain development. Typically, such organoids are grown for 2-3 months, but a new study has kept them alive for up to seven years. This allowed researchers to observe how brain cells change over long periods: which cell types emerge, how their function changes, and how gene activity shifts. Most interestingly, they began to show signs of "aging" as metabolic groups accumulated in their DNA.
The lab-grown tissue did not just exist for a long time; it underwent similar maturation and aging processes as a real brain. Researchers observed a diversity of cells, the formation of more complex structures, and changes that usually occur in the human brain over many years. This is particularly useful, given that some diseases (Parkinson's, schizophrenia, Alzheimer's) only manifest with age. Previously, it was impossible to study these diseases using organoids, as the model did not survive long enough to reach the necessary stage. Now, scientists have a tool to observe long-term changes in neural networks and cellular processes, as reported in Nature, July 2026.
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