{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nSLC34A1 encodes the renal type IIa sodium‐phosphate cotransporter (NaPi‐IIa), a critical protein expressed predominantly in the proximal tubule that reclaims the bulk of filtered phosphate to maintain systemic phosphate homeostasis. Genome‐wide studies and expression analyses have established that NaPi‐IIa not only contributes fundamentally to nephrogenesis and overall kidney function but also influences circulating phosphate levels in the general population. The transporter’s functional importance is underscored by its role in normal renal physiology, as evidenced by clinical associations with variations in estimated glomerular filtration rate and serum phosphate concentrations."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "4"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nInherited and sporadic mutations in SLC34A1 have been linked to a spectrum of clinical disorders arising from defective phosphate reabsorption. Loss‐of‐function alterations lead to primary renal phosphate wasting, which in turn may cause idiopathic infantile hypercalcemia, proximal renal Fanconi syndrome, hypophosphatemic nephrolithiasis/nephrocalcinosis, and even overlapping syndromes that manifest with hypercalciuria. Both autosomal‐recessive and autosomal‐dominant patterns have been documented, with case reports of affected siblings and families illustrating how genetic defects in SLC34A1 disrupt intracellular trafficking of NaPi‐IIa and impair phosphate transport. These findings have important therapeutic implications, as distinguishing SLC34A1 defects from other vitamin D–regulatory disorders facilitates targeted interventions, such as phosphate supplementation."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "5", "end_ref": "16"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBeyond these genetic defects, studies have illuminated the complex regulatory network modulating SLC34A1 function. Detailed kinetic and structural investigations have revealed that NaPi‐IIa activity is finely tuned by several hormonal signals—including parathyroid hormone, fibroblast growth factor‐23, and estrogen—as well as intracellular signaling cascades involving kinases such as B‐RAF. Interactions with scaffold proteins such as NHERF1 and modulatory proteins including RGS family members further govern transporter localization and activity via dynamic trafficking and phosphorylation events. These mechanistic insights, derived in part from electrophysiological studies, mutagenesis experiments, and analyses of promoter regions, underscore how tightly controlled SLC34A1 function is critical to proper renal phosphate handling."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "17", "end_ref": "28"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "H Hilfiker, I Kvietikova, C M Hartmann, et al. 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