The Neuron that Exists Only in Humans (New Findings)
Published in Brain/Neurology.
The Neuron that Exists Only in Humans 🌩️ (New Findings)
Scientists have identified a previously unknown GABAergic neuron in the human cerebral cortex, one with a distinct structure, molecular signature, and function that doesn’t exist in rodents.
Meet the rosehip neuron 🌹
What makes it special:
🔬 Human-specific: Discovered using single-nucleus RNA sequencing; its molecular signature is absent in the mouse cortex
🌿 Distinct anatomy: Compact axonal arbor with large, bulbous “rosehip-like” boutons
🧬 Unique molecular profile: GAD1 & CCK positive; negative for CNR1, SST, CALB2, and PVALB
🔗 Tightly connected: Forms homotypic gap junctions with other rosehip cells
🎯 Precision targeting: Synapses onto apical dendritic shafts of layer 3 pyramidal neurons
⚡ Computational control: Suppresses back-propagating action potentials in tiny dendritic microdomains
Rosehip neurons are positioned to exert powerful, localized control over dendritic computation—the very processes thought to underlie learning, integration, and conscious perception. Their absence in animal models also raises an important question:
➡️ How much of human cognition relies on circuitry we’ve never been able to study before?
Credit Eszter Boldog and their team for the work!