{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nSCN5A encodes the pore‐forming α‐subunit of the cardiac sodium channel (Na(v)1.5), which is essential for the initiation and propagation of action potentials in the heart. Alterations in SCN5A lead to a broad spectrum of cardiac electrophysiological disorders. Gain‐of‐function mutations can delay inactivation and increase late sodium current, as seen in long QT syndrome type 3 (LQT3), whereas loss‐of‐function mutations predispose to Brugada syndrome and progressive cardiac conduction defects. In addition, genetic screens and genome‐wide association studies have revealed both rare mutations and common polymorphisms that influence conduction parameters such as the QT and PR intervals, as well as susceptibility to atrial fibrillation, sudden infant death, and complex overlap syndromes. These findings emphasize a gene‐specific basis for arrhythmia triggers and variable disease penetrance."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "33"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nAt the molecular level, Na(v)1.5 function is tightly regulated by an intricate network of protein–protein interactions and post‐translational mechanisms. The channel contains conserved motifs—including a PDZ‐binding sequence—that mediate interactions with key structural and adaptor proteins such as ankyrin-G, dystrophin, and syntrophins. Such interactions are critical for proper membrane targeting and clustering of Na(v)1.5 at intercalated discs and T-tubules. In parallel, regulatory mechanisms such as ubiquitination via Nedd4-2 dynamically control the surface density of the channel without altering its intrinsic biophysical properties. Furthermore, common polymorphisms and splice variants of SCN5A can modulate the effects of pathogenic mutations, contributing to the variability of clinical phenotypes observed among affected individuals."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "34", "end_ref": "41"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nEmerging evidence also points to roles for SCN5A beyond traditional cardiac electrophysiology. Aberrant expression of Na(v)1.5 has been implicated in the invasive behavior of cancer cells, where increased sodium influx appears to promote cell motility and extracellular matrix degradation in colon and breast malignancies. Moreover, patient-specific induced pluripotent stem cell models harboring SCN5A mutations have provided valuable insights into the molecular and biophysical underpinnings of arrhythmia phenotypes, paving the way for personalized therapeutic strategies."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "42", "end_ref": "44"}, {"type": "fg_f", "ref": "31"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "P J Schwartz, S G Priori, C Spazzolini, et al. 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