{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nSLC18A2 encodes the vesicular monoamine transporter 2 (VMAT2), a critical protein responsible for sequestering cytosolic monoamines—most notably dopamine and serotonin—into synaptic vesicles for regulated release. By packaging these neurotransmitters, VMAT2 not only ensures efficient synaptic transmission but also protects neurons from the cytotoxic effects of dopamine oxidation and other free‐radical–mediated damages. This basic function has been demonstrated in studies showing that reduced VMAT2 expression is sufficient, by itself, to initiate nigrostriatal degeneration and other parkinsonian features, and that specific mutations in SLC18A2 can lead to severe infantile movement disorders."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "5"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBeyond its fundamental role in monoamine storage, genetic variability in SLC18A2 has been implicated in modulating dopamine homeostasis and in determining susceptibility to a range of neuropsychiatric and movement disorders. Promoter polymorphisms and rare coding variants have been linked to altered VMAT2 expression or function—thereby influencing the risk for conditions such as Parkinson’s disease, tardive dyskinesia, and substance dependence—as well as contributing to abnormal monoamine handling in peripheral tissues (for example, in the placenta or pancreatic β‐cells). These findings underscore that even subtle changes in SLC18A2 regulation can have broad functional consequences, from aberrant synaptic dopamine levels to impaired neuronal survival, and they highlight the gene’s value as a potential biomarker or therapeutic target in both central and peripheral pathologies."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "6", "end_ref": "18"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nRecent advances have further illuminated the structural and pharmacological landscape of VMAT2. Cryo‐electron microscopy and biochemical studies have provided a high‐resolution view of the transporter’s conformational states and its substrate–inhibitor interactions—insights that explain how clinically relevant drugs (such as tetrabenazine, reserpine, and ketanserin) bind and modulate VMAT2 function. In parallel, imaging studies leveraging PET radioligands directed against VMAT2 have contributed to our ability to assess monoaminergic terminal integrity in both the brain and peripheral tissues, while emerging data on co‐expression with other markers (for instance, in gastric endocrine cells) continue to expand our understanding of its broader biological roles."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "19", "end_ref": "28"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "C E Glatt, J A DeYoung, S Delgado, et al. 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