{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nThe SLC12A1 gene encodes the kidney‐specific Na⁺–K⁺–2Cl⁻ cotransporter (NKCC2), which localizes to the apical membrane of epithelial cells in the thick ascending limb of Henle’s loop. By mediating the reabsorption of sodium, potassium and chloride, NKCC2 plays a central role in regulating renal salt handling and, consequently, blood pressure homeostasis. Its activity is finely tuned by intracellular chloride levels and is regulated by multiple kinase pathways—including activation by the WNK–SPAK/OSR1 cascade and modulation via specific phosphorylation sites—as revealed by both comparative genomic and biochemical investigations. The transporter’s function not only underpins the antihypertensive action of loop diuretics but also contributes to variations in blood pressure among individuals, as demonstrated by rare loss‐of‐function alleles that confer protection from hypertension."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "11"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nMutations in SLC12A1 disrupt NKCC2 function and cause type I Bartter syndrome, a salt‐losing tubulopathy that typically manifests with hypokalemic metabolic alkalosis, polyuria, and, in severe cases, polyhydramnios and premature birth. Comprehensive molecular studies have characterized numerous rare, deleterious mutations that impair transporter folding, trafficking and complex glycosylation, leading to reduced cell‐surface expression and ion transport activity. The clinical spectrum ranges from the classical antenatal presentation with neonatal salt wasting to milder, late‐onset phenotypes. These findings underscore that defective NKCC2 function—whether due to complete loss of activity or residual, partial transport—is the underlying cause of the disorder, and they highlight the importance of SLC12A1 as a key determinant of renal salt reabsorption."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "12", "end_ref": "27"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nAdditional studies have elucidated the molecular mechanisms that regulate NKCC2 processing and stability. Critical insights have emerged regarding the role of endoplasmic reticulum quality control, the involvement of specific chaperones and ER‐associated degradation pathways, and the importance of di-acidic motifs in facilitating proper ER exit. Moreover, NKCC2 expression has been documented beyond the kidney—evident in gastric and colonic epithelia—implying potential roles in extra‐renal ion transport and volume regulation. Recent evidence also suggests that rare variants of SLC12A1 may modulate blood pressure in the general population and that aberrant NKCC2 expression or fusion events could have implications in oncologic contexts, such as glioma and chemoresistance in luminal breast cancer."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "28", "end_ref": "39"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Weizhen Ji, Jia Nee Foo, Brian J O'Roak, et al. 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