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      Novel NCCT gene mutations as a cause of Gitelman's syndrome and a systematic review of mutant and polymorphic NCCT alleles.

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          Abstract

          Gitelman's syndrome (GS) is characterized by hypokalemic metabolic alkalosis, hypomagnesemia and hypocalciuria and these phenotypic features have been shown to be attributable to mutations in the gene encoding the thiazide-sensitive Na/Cl cotransporter (NCCT). Until now, 55 different mutations have been reported and most of the families affected with GS exhibit autosomal recessive inheritance.

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          Gitelman's variant of Bartter's syndrome, inherited hypokalaemic alkalosis, is caused by mutations in the thiazide-sensitive Na-Cl cotransporter.

          Maintenance of fluid and electrolyte homeostasis is critical for normal neuromuscular function. Bartter's syndrome is an autosomal recessive disease characterized by diverse abnormalities in electrolyte homeostasis including hypokalaemic metabolic alkalosis; Gitelman's syndrome represents the predominant subset of Bartter's patients having hypomagnesemia and hypocalciuria. We now demonstrate complete linkage of Gitelman's syndrome to the locus encoding the renal thiazide-sensitive Na-Cl cotransporter, and identify a wide variety of non-conservative mutations, consistent with loss of function alleles, in affected subjects. These findings demonstrate the molecular basis of Gitelman's syndrome. We speculate that these mutant alleles lead to reduced sodium chloride reabsorption in the more common heterozygotes, potentially protecting against development of hypertension.
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            Hyperplasia of the juxtaglomerular complex with hyperaldosteronism and hypokalemic alkalosis

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              Novel mutations in the thiazide-sensitive NaCl cotransporter gene in patients with Gitelman syndrome with predominant localization to the C-terminal domain.

              Gitelman syndrome (familial hypokalemia-hypomagnesemia syndrome) is an autosomal recessive inherited renal disorder characterized by defective tubular reabsorption of magnesium and potassium. In this study a group of 18 unrelated and 2 related Gitelman patients, collected from six different countries have been screened for mutations in the human thiazide-sensitive sodium-chloride cotransporter (SLC12A3) gene. Fourteen novel SLC12A3 mutations are presented along with six mutations described earlier, and three neutral polymorphisms. Among the tested patients are two who carry a total of three heterozygous SLC12A3 mutations. Two-thirds of the total number of mutant SLC12A3 alleles are amino acid substitutions. Most SLC12A3 gene mutations, 14 out of a total of 20, are localized at the intracellular carboxy-terminal domain of the NCCT protein. The pathogenicity of individual SLC12A3 mutations is based upon their predicted effect on SLC12A3 protein, and segregation in family members. Evolutionary conservation of substituted amino acid residues and their frequency in control chromosomes is presented. Identical mutations have been found in Gitelman families from different geographical origin, suggesting ancient mutations originating from a common ancestor. As yet, we have not found any evidence for a possible genotype-phenotype correlation.
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                Author and article information

                Journal
                Kidney Blood Press. Res.
                Kidney & blood pressure research
                S. Karger AG
                1420-4096
                1420-4096
                2002
                : 25
                : 6
                Affiliations
                [1 ] Department of Clinical Biochemistry, Medizinische Poliklinik, Division of Nephrology, University of Bonn, Germany.
                Article
                68695
                10.1159/000068695
                12590198
                5fe56c92-8efe-43c5-8db0-2d10b1852c9c
                History

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