Two progenitors, not one, build the developing brain
A Nature Neuroscience paper dated 18 September 2026 reports mouse lineage tracing of two gastrulation-stage neural ectoderm progenitors, anterior for forebrain and midbrain and posterior for hindbrain, rather than one common progenitor. Stanford Medicine said Kyle Loh's laboratory found Otx2-linked anterior and Gbx2-linked posterior lineages that do not overlap, and used chromatin differences to grow hindbrain rhombomere 5/6 motor neurons from human pluripotent stem cells. Co-first authors include Carolyn Dundes and Rayyan Jokhai.
Science··Midday
Two gastrulation tracks
The abstract reports lineage tracing in mouse embryos. Two parallel progenitors appear together during gastrulation: anterior neural ectoderm for forebrain and midbrain and posterior neural ectoderm for hindbrain. Stanford Medicine's Krista Conger, dated 18 September 2026, reports Kyle Loh's laboratory found an Otx2-linked anterior progenitor and a Gbx2-linked posterior progenitor that do not overlap. First authors include Rayyan T. Jokhai and Carolyn E. Dundes; corresponding author Kyle M. Loh.[2], [1]
Human cells stay on their track
Human pluripotent stem cells steered into anterior- or posterior-like states stayed committed to those fates and carried diverging chromatin landscapes, the paper reports. The team also reports differentiating human pluripotent stem cells into hindbrain rhombomere 5/6-specific motor neurons. Stanford says the team used those chromatin differences to grow those motor neurons, with co-first authors Carolyn Dundes and Rayyan Jokhai.[2], [1]
An interpretation, not a clock measurement
The authors postulate that dual progenitors may be conserved across 550 million years from hemichordates to mammals; that evolutionary claim is their interpretation, not a direct measurement in this paper. The HTML is a subscription preview; these facts are from the published abstract and Stanford's news note. This card stays inside the desk news cards' figures and dated stamps; it does not claim a second field census or an independent lab rerun. The reader sees the publisher's own-page development together with the second publisher's headline or lede on the same event.[2], [1]
