Evolutionary biology stories

Sep 20, 2026

Stanford scientists discover human brain develops from two separate ancient cell systems

Stanford University researchers have found that the human brain develops from two distinct cellular systems that evolved independently before fusing together, challenging the traditional understanding of brain development as originating from a single source. The discovery suggests evolution combined two ancient nervous systems with different functions, and may explain why certain hindbrain neurons have been difficult to study in laboratories.

Sep 20, 20265 sources

Top claims

▪During embryonic gastrulation, one progenitor cell population expressing the Otx2 gene forms the forebrain and midbrain, while a separate population expressing the Gbx2 gene forms the hindbrain.
▪The two progenitor cell populations exhibit fundamentally different chromatin configurations that package DNA differently, committing them to separate developmental pathways from the start.
▪The Stanford Medicine study suggests the human brain is a composite structure formed from two ancient nervous systems that evolved independently and were integrated spatially over evolutionary history.

Subtopics

Drug Approval and Clinical Trials1 Neuroscience1 Scientific research1

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