Three cases of Gitelman's syndrome possibly caused by different mutations in the thiazide-sensitive Na-Cl cotransporter.

Three adult Japanese cases of Gitelman's syndrome were characterized by secondary aldosteronism, hypokalemic alkalosis, hypomagnesemia, and hypocalciuria. Two were revealed to be familial cases. A mutation in the thiazide-sensitive Na-Cl cotransporter gene, which had already been confirmed in one family (Takeuchi et al. J Clin Endocrinol Metab 81: 4496,1996), was not detected in the other two cases. These observations may possibly support the previous report (Simon et al. Nature Genet 12: 24, 1996) that Gitelman's syndrome is caused by a variety of mutations in the thiazide-sensitive Na-Cl cotransporter.