Overview
- The peer‑reviewed study published Sept. 18, 2026 in Nature Neuroscience reports two mutually exclusive progenitor pools in early gastrulation that form the forebrain/midbrain and the hindbrain.
- Researchers identified the anterior progenitors by Otx2 expression and the posterior progenitors by Gbx2 expression and found the two populations do not overlap at the earliest stages examined.
- Distinct chromatin configurations in anterior versus posterior neural ectoderm appear to epigenetically commit each progenitor population to its separate fate, which prevents later fate switching.
- Using that developmental program the team guided human pluripotent stem cells to become functional hindbrain motor neurons in vitro that show electrical activity and region‑specific proteins.
- The two‑origin pattern was observed across distant species including chicken, zebrafish and acorn worms, suggesting deep evolutionary conservation and giving researchers a new platform to study SMA, ALS and other brain‑stem disorders while therapeutic use remains a future goal.