EPFL Team Maps 539 Chemically Distinct Lipizones Across Mouse Brain

The study combined laser-based mass spectrometry imaging with custom machine-learning reconstruction to generate roughly 7 million lipid measurements across 172 molecular species. This produced a 3D atlas in which each voxel carries a lipid signature rather than a gene-expression or cell-type label. Many lipizones align with known structures, yet others cross traditional boundaries, particularly within white-matter tracts and the choroid plexus, showing that myelin-producing cells exhibit far greater chemical diversity than their transcriptomes suggest. Lipid composition therefore functions as an orthogonal coordinate system that links distant but functionally related regions through shared membrane chemistry. The finding directly addresses the long-standing gap between static anatomical maps and the dynamic lipid changes already linked to depression and Alzheimer’s disease. Because lipids are both structural and signaling molecules, the atlas supplies a missing layer for interpreting how membrane composition influences circuit function. Next steps include extending the approach to human postmortem tissue and testing whether specific lipizones shift predictably in disease models. If validated, lipid-zone signatures could become biomarkers or therapeutic targets that current gene-centric atlases cannot detect.