BSND and Hypokalemia: Whole-exome sequencing (WES) excluded pathogenic variants in renal tubulopathy genes including SLC12A3 (Gitelman syndrome), SLC12A1, CLCNKB, BSND, KCNJ1, MAGED2 (Bartter syndrome), and CASR, CLCNKA, KCNJ10 (hypokalemia-associated genes).