GRIN3A (Glutamate Ionotropic Receptor NMDA Type Subunit 3A) is a gene that encodes a subunit of the NMDA receptor, which is part of the glutamate receptor family. NMDA receptors are crucial for synaptic plasticity, learning, and memory, playing a key role in neuronal communication. Variations in GRIN3A can affect brain function and are significant in neurological research.