Duke-NUS Team Builds Detailed Map of Developing Human Brain

Scientists from Duke-NUS Medical School have developed a detailed single-cell map of the developing human brain. This comprehensive atlas captures nearly every cell type in the fetal brain, their genetic profiles, and their developmental interactions. It provides a rigorous standard for laboratory methods generating high-fidelity neurons, particularly midbrain dopaminergic neurons involved in Parkinson’s disease.

To construct this map, the researchers used a two-step framework called BrainSTEM (Brain Single-cell Two tiEr Mapping) to analyze around 680,000 fetal brain cells, with a focus on the midbrain where dopaminergic neurons reside. This second higher-resolution layer precisely identifies these neurons, enabling an accurate reference for assessing lab-grown cell models against actual human brain development. The study showed that existing lab protocols often yield off-target cells from other brain regions, highlighting the need for better data-driven approaches to ensure purity and accuracy.

According to Hilary Toh, one of the lead authors of the paper published in Science Advances, “Our data-driven blueprint helps scientists produce high-yield midbrain dopaminergic neurons that faithfully reflect human biology. Grafts of this quality are pivotal to increasing cell therapy efficacy and minimizing side effects, paving the way to offer alternative therapies to people living with Parkinson’s disease.”

Alfred Sun, co-senior author, added that “BrainSTEM marks a significant step forward in brain modelling. By delivering a rigorous, data-driven approach, it will speed the development of reliable cell therapies for Parkinson’s disease. We’re setting a new standard to ensure the next generation of Parkinson’s models truly reflects human biology.”