{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nSLC37A4 encodes an endoplasmic reticulum (ER)‐localized multi‐transmembrane transporter that is essential for cellular glucose homeostasis. It mediates the transport of glucose‑6‑phosphate (G6P) from the cytoplasm into the ER lumen, where tissue‑specific phosphatases hydrolyze G6P to glucose and inorganic phosphate. Structural and mutational studies have defined its transmembrane architecture and established that proper SLC37A4 function is critical for glycogenolysis and gluconeogenesis. Defects in its activity result in glycogen storage disease type 1b (GSD1b), a metabolic disorder characterized by hepatic and renal dysfunction along with neutropenia and immune anomalies."}, {"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 classic metabolic role, SLC37A4 exerts broader effects on cellular physiology. In brain tumor–derived cells and mesenchymal stem cells, modulation of SLC37A4 levels influences cell survival, autophagic flux, and metabolic reprogramming, with downstream alterations in signaling cascades such as Akt phosphorylation and mTORC1 activity. In parallel, changes in its function have been linked to modifications of Golgi morphology and glycosylation patterns, as well as to the maintenance of epithelial barrier integrity via regulation of tight junction components, underscoring its involvement in diverse cell signaling and homeostasis mechanisms."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "6", "end_ref": "13"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nExtensive genetic analyses in diverse patient cohorts have illuminated the mutation spectrum and genotype–phenotype correlations of SLC37A4. Numerous pathogenic variants have been identified that disrupt G6P transport and interfere with normal post‑translational regulation, thereby contributing to the complex clinical manifestations of GSD1b. These studies not only underscore the essential role of SLC37A4 in metabolic and immunological functions but also emphasize the importance of precise molecular diagnostics and genetic counseling for affected individuals."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "14", "end_ref": "22"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Daniela Melis, Rossella Fulceri, Giancarlo Parenti, et al. 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