Dynamic roles of embryonic glial cells in octopus brain development.

An embryonic glial cell population in Octopus vulgaris is defined by nr4a, dlx, and pros regulons and may coordinate early brain development.

• Why it matters: Understanding neural development in cephalopods is crucial because their large nervous systems are comparable to small mammals, yet their developmental mechanisms remain largely unknown.
• What they did: The study used single-cell multi-omics and spatial expression analysis to identify and characterize a distinct embryonic glial cell type across mollusks and compare its gene expression profile with other species.
• The result: Findings suggest this conserved mollusk glial cell type may have evolved new functions in coleoid cephalopods to organize neuronal migration and wiring, contributing to their brain expansion.