Overview
- The study, which was published in Cell on September 1, 2026, generated a cross-region single-cell atlas that defines 31 neuronal subpopulations in the human striatum, including nine types of medium spiny neurons.
- Researchers identified two 'outlier' medium spiny neuron classes with distinct drug-response gene patterns: D1 outliers enriched for opioid-response genes and D2 outliers enriched for antidepressant-response genes, and both show strong molecular signatures linked to clozapine response.
- The atlas explains regional vulnerability in Huntington’s disease by showing dorsal medium spiny neurons express higher levels of the mismatch-repair genes MSH2 and MSH3, while a rare ventral island-like MSN population appears more resistant to CAG-repeat accumulation.
- The team profiled tissue from U.S. and Canadian brain banks using single-nucleus RNA sequencing, spatial transcriptomics, and multiplexed fluorescent in situ hybridization across 109 human and 22 mouse samples to map cell types and spatial patterns.
- The resource highlights species differences—OPRM1 (the mu opioid receptor) is highly expressed in the human D1 outliers but not in corresponding mouse cells—and is presented as a roadmap for targeted experiments, model humanization, and future drug-target discovery though no new therapies have emerged yet.