Five-Year Brain Organoids Match 4-Year-Old Cortex
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- Paola Arlotta at Harvard University and colleagues analyzed five-year-old cortical organoids grown from human stem cells, finding their genetic activity and epigenetic marks mimic those of a typical 4-year-old child's cerebral cortex, with Arlotta saying they were 'recording the passage of time in their epigenetic signatures and gene activity.'
- The organoids tracked development in stages: at three to six months they resembled fetal brains at three to six months post-conception, then gradually shifted to match older cortical profiles through their fifth year.
- The five-year mark makes these the longest-lived brain organoids studied in detail to date, surpassing the previous 2021 record of two-year organoids that mirrored cortical development up to roughly one year of age.
- Arlotta's team has grown the same kind of organoids for up to seven years, but too few exist for reliable analysis, she said.
- Andras Lakatos at the University of Cambridge, who was not involved in the study, said such long-lived organoids could let researchers study how autism and epilepsy emerge during later stages of brain development — and Arlotta confirmed her team is already using them for that purpose and for drug screens against conditions like epilepsy.
- Lakatos cautioned that expense and manual labor typically limit organoid growth to a few months at other labs, and called finding ways to speed up organoid aging 'important for research.'
Why it matters: By matching five-year organoids to a 4-year-old's cortical profile, the Harvard team gives researchers a window into late-stage brain development — the period when conditions like autism and epilepsy typically emerge — though Lakatos notes the cost and manual labor keep most labs stuck growing organoids for only a few months, narrowing who can actually run these studies.
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