{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nGlutamate delta‐1 (GluD1) receptors are emerging as unconventional organizers of synaptic architecture across multiple brain regions. Although they lack classical ligand‐gated ion channel activity, GluD1 has been shown to critically influence synapse formation and maturation. For instance, loss of GluD1 produces abnormal emotional and social behaviors along with changes in glutamatergic subunit expression, suggesting a key role in presynaptic differentiation and synaptogenesis mediated via interactions with cerebellin proteins and neurexins. In addition, targeted mutations within the receptor’s transmembrane domains can unmask spontaneous channel activity that is modulated by extracellular Ca²⁺ and small amino acids such as d-serine."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "3"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBeyond its synaptogenic function, GluD1 is pivotal for the regulation of forebrain circuitry underlying cognitive and behavioral flexibility. Selective ablation of GluD1 in the dorsal striatum impairs thalamostriatal connectivity and produces deficits in reversal learning, while in the hippocampus GluD1 forms a signaling complex with metabotropic glutamate receptor 5 that regulates mTOR-dependent processes such as protein translation and receptor internalization. These interactions underscore a noncanonical role of GluD1 in modulating intracellular signaling cascades that are fundamental for synaptic plasticity."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "4"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nGluD1’s influence also extends to circuits mediating reward and aversion. In the nucleus accumbens, its deletion enhances cocaine-conditioned reward, correlating with alterations in dendritic spine morphology and NMDA receptor subunit composition. Similarly, within the central amygdala, disrupted GluD1-cerebellin 1 signaling impairs excitatory transmission at key nociceptive synapses, contributing to persistent pain and abnormal aversive learning. These findings collectively highlight the broad contribution of GluD1 to behavioral modulation and its potential involvement in various neuropsychiatric conditions."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "6"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Roopali Yadav, Subhash C Gupta, Brandon G Hillman, et al. 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