Stanford Researchers Identify Distinct Developmental Origins for Forebrain and Hindbrain
A Stanford-led study published in Nature Neuroscience reports that the human forebrain and hindbrain arise from separate progenitor cells, a finding that may reshape understanding of brain evolution and improve laboratory modeling of neurological diseases.
Researchers at Stanford University have provided evidence that the human brain consists of two developmentally separate organs. In a paper published in Nature Neuroscience, the team showed that the forebrain and hindbrain originate from distinct progenitor cells during early embryonic stages, a split that appears to have evolved independently over hundreds of millions of years.
The discovery challenges the long-standing view of the brain as a single entity formed along one evolutionary pathway. It also offers a new strategy for generating hindbrain neurons in vitro, a step that could accelerate research on disorders that affect the brain stem, such as amyotrophic lateral sclerosis.
“We’ve shown for the first time that the front of the brain arises from a totally different progenitor cell than the back of the brain,” said senior author Kyle Loh, associate professor of developmental biology at Stanford.
“Our discovery means that we can now grow neurons from the back of the brain, the hindbrain, in a petri dish and study their functions,” he added.
Using mouse embryos, the scientists observed that separate progenitor populations give rise to the fore- and midbrain on one hand, and the hindbrain on the other, each with distinct chromatin signatures. Co-first author Rayyan Jokhai noted that previous attempts to produce hindbrain neurons likely failed because they tried to coax forebrain progenitors into a hindbrain fate.
The team successfully derived hindbrain motor neurons from pluripotent stem cells, marking the first such achievement. Comparative analyses indicated similar divergent developmental routes in species ranging from zebrafish and chickens to acorn worms, suggesting an ancient evolutionary split that later merged spatially to form a single brain structure.
The researchers propose that this dual-origin architecture may have facilitated the evolution of higher-order functions in the forebrain while preserving essential life-supporting processes in the hindbrain.