SLC9A3 and Nephropathy: In four patients (three adults and one child), we detected 12 variants in three genes known to be associated either with monogenic forms of proximal renal tubulopathy (SLC3A1) or with monogenic syndromes involving proximal tubule dysfunction (LRP2, CUBN), as well as in novel genes not related to monogenic nephropathies (SLC17A1, SLC9A3, and PDZK1).