POINTseq: Cell-type-specific barcoding reveals single-cell projection architecture of the mouse dopaminergic system.

POINTseq reveals that over 25 distinct connectomic cell types of dopaminergic neurons in the mouse VTA and SNc form stereotyped projection motifs, vastly exceeding known diversity.

• Why it matters: Understanding the detailed projection architecture of dopaminergic neurons is crucial for elucidating how dopamine mediates diverse brain functions. Current methods lack the resolution to map single-cell projections across the entire brain efficiently.
• What they did: The authors developed POINTseq, a viral-based, cell-type-specific barcoding method, and applied it to map the projections of 5,902 individual dopaminergic neurons in the mouse VTA and SNc, identifying their connectomic cell types and projection patterns.
• The result: The study shows that dopaminergic neurons form stereotyped projection motifs across >25 cell types, providing an anatomical basis for the diverse functions of dopamine signaling in the brain.