BSND and Bartter syndrome: Bartter’s syndrome (BS) is a rare inherited disease caused by mutations in the salt transporters of the thick ascending limb of the loop of Henle (TAL) and/or their regulatory subunits: SLC12A1 encoding NKCC2 (BS 1), KCNJ1 encoding ROMK (BS 2), CLCNKB encoding CLC-Kb (BS 3), BSND encoding Barttin (BS 4a), and CLCNKA and CLCNKB encoding CLC-Ka, CLC-Kb, respectively (BS 4b) and MAGED2 encoding MAGED2 (BS 5) [1].