Drebrin 1 (DBN1)

Drebrin 1 (DBN1) is a cytoplasmic, actin-binding protein crucial for neuronal development, synaptic function, and cytoskeleton organization. Encoded by the DBN1 gene, it exists as two major isoforms—drebrin A (neuron-specific, found predominantly in adult brain dendritic spines) and drebrin E (expressed earlier in development and in non-neuronal cells)[2][3][5]. Drebrin regulates the morphology and plasticity of dendritic spines and is involved in intercellular junctions and immune synapses[2][3][4]. It acts by stabilizing F-actin and coordinating actin–microtubule interactions, such as binding to microtubule plus-end proteins like EB1/EB3 and forming unique F-actin scaffolds for molecular signaling[3][4]. Reduction of drebrin has been associated with synaptic loss and cognitive impairment in Alzheimer’s disease and Down syndrome[3][4][5]. Drebrin is not a typical pharmacological target such as a receptor or enzyme, and there are no known drugs directly targeting it, but it plays a key mechanistic role in diseases linked to cytoskeletal dysregulation and neuronal connectivity[2][3][5].

Other names

DrebrinD0S117EDevelopmentally-regulated brain proteinDrebrin ADrebrin EDrebrin E2