Perisomatic ultrastructure efficiently classifies cells in mouse cortex by Leila Elabbady1,2, Sharmishtaa Seshamani1, Shang Mu3, Gayathri Mahalingam1, instant download

Perisomatic ultrastructure efficiently classifies cells in mouse cortex by Leila Elabbady1,2, Sharmishtaa Seshamani1, Shang Mu3, Gayathri Mahalingam1, instant download

Mammalian neocortex contains a highly diverse set of cell types. These cell types have been mapped systematically using a variety of molecular, electrophysiological and morphological approaches1–4. Each modality ofers new perspectives on the variation of biological processes underlying cell-type specialization. Cellular-scale electron microscopy provides dense ultrastructural examination and an unbiased perspective on the subcellular organization of brain cells, including their synaptic connectivity and nanometre-scale morphology. In data that contain tens of thousands of neurons, most of which have incomplete reconstructions, identifying cell types becomes a clear challenge for analysis5. Here, to address this challenge, we present a systematic survey of the somatic region of all cells in a cubic millimetre of cortex using quantitative features obtained from electron microscopy. This analysis demonstrates that the perisomatic region is sufcient to identify cell types, including types defned primarily on the basis of their connectivity patterns. We then describe how this classifcation facilitates cell-type-specifc connectivity characterization and locating cells with rare connectivity patterns in the dataset.