Synaptic Ras GTPase-activating protein 1 (SYNGAP1)

Synaptic Ras GTPase–activating protein 1 (SYNGAP1) is a major component of the postsynaptic density at excitatory synapses in the brain. It functions as a Ras/Rap GTPase activating enzyme, negatively regulating these small G-proteins, which are critical for intracellular signaling cascades involved in synapse formation, plasticity, and cognitive development. SYNGAP1 is essential for normal cognition, learning, memory, and proper maturation of dendritic spines. It acts as an inhibitory regulator within NMDA receptor complexes to control AMPA receptor insertion into the membrane—a key process underlying synaptic strength adjustments during learning. Mutations or loss-of-function variants in SYNGAP1 cause severe neurodevelopmental disorders including intellectual disability, epilepsy, autism spectrum disorder, and sensory processing abnormalities. The gene produces multiple isoforms through alternative splicing that can have distinct effects on neuronal signaling; knockout models demonstrate its necessity for survival and normal brain circuit formation[1][2][4].

Other names

SynGAPRASA5 (Ras GTPase-activating protein 5)Synaptic Ras-GAP 1