Overview
- A peer-reviewed paper led by Kyle Loh and published online Sept. 18 reports that the brain forms from two parallel, nonoverlapping progenitor populations rather than a single early progenitor.
- Researchers identified an Otx2-marked anterior lineage that makes forebrain and midbrain tissue and a Gbx2-marked posterior lineage that makes hindbrain tissue, with the two lineages remaining separate in early gastrulation.
- Chromatin profiling showed the anterior and posterior neural ectoderm have different DNA‑packaging states that commit each cell population to its fate and prevent one lineage from becoming the other.
- Using that developmental insight, the team guided human pluripotent stem cells to become functional hindbrain motor neurons that fire action potentials and express proteins tied to hindbrain motor segments.
- The advance creates new models to study brain‑stem diseases such as SMA and ALS, prompts follow-up work on spinal‑cord origins, and leaves open a targeted question about any very brief common progenitor that will require more experiments.