Overview
- A Stanford-led paper published Sept. 18, 2026, reports that the vertebrate brain arises from two mutually exclusive gastrulation-stage progenitors rather than a single common source.
- The anterior lineage, marked by Otx2, forms forebrain and midbrain tissue and the posterior lineage, marked by Gbx2, forms the hindbrain, and each lineage shows distinct chromatin states that commit fate early.
- Using those molecular cues, the team guided human pluripotent stem cells to become electrically active hindbrain motor neurons in vitro, a cell type researchers had long failed to produce reliably.
- The new cell model creates a way to study brainstem conditions such as spinal muscular atrophy and ALS and to test how drugs that act on hindbrain circuits, including some obesity medicines, affect human brainstem neurons.
- Authors note limits: their methods cannot fully rule out a very brief, unmeasured window when a common progenitor might exist, and next steps include mapping spinal cord origins and probing disease mechanisms.