Konrad et al. (Konrad et al. 2000) and (Jeck et al. 2000) reported that variants in the CLCNKB gene not only cause classical Bartter syndrome (type III), but also phenotypes that overlap with either antenatal Bartter syndrome (Types I-II) or Gitelman syndrome. The gene discussed is CLCNKB; the disease is Gitelman syndrome.