Association of a mutation in thiazide-sensitive Na-Cl cotransporter with familial Gitelman's syndrome.
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Takeuchi K, Kure S, Kato T, Taniyama Y, Takahashi N, Ikeda Y, Abe T, Narisawa K, Muramatsu Y, Abe K
Association of a mutation in thiazide-sensitive Na-Cl cotransporter with familial Gitelman's syndrome.
J Clin Endocrinol Metab. 1996 Dec;81(12):4496-9.
- PubMed ID
- 8954067 [ View in PubMed]
- Abstract
Gitelman's syndrome is a variant of Bartter's syndrome, characterized by hypokalemia, hypomagnesemia, hypocalciuria, and hypovolemia. We have observed familial cases of Gitelman's syndrome, and a possible mutation in thiazide-sensitive Na-Cl cotransporter was investigated in this kindred. The proband was a 47-yr-old Japanese female, and her mother was also affected. Her parents and maternal grandparents are consanguineous. By using PCR-amplification and direct sequencing, we identified a novel non-conservative missense mutation at 623 amino acid position, which substitutes proline for leucine (L623P), and also creates an Nci I restriction site in the exon 15. The mutation was not detected in normal healthy subjects (n = 102). Nci I digestion of PCR-amplified exon 15 DNA fragments from individuals in the family indicated the autosomal recessive inheritance of the disorder. In conclusion, the L623P mutation in the thiazide-sensitive Na-Cl cotransporter gene is suggested to impair the transporter activity, and to underlie this familial Gitelman's syndrome; Gitelman's syndrome observed in this kindred has been inherited in an autosomal recessive fashion.