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Deprecated: Implicit conversion from float 265.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Kidney+Blood+Press+Res 2002 ; 25 (6): 354-62 Nephropedia Template TP
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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 #MMPMID12590198
Reissinger A; Ludwig M; Utsch B; Promse A; Baulmann J; Weisser B; Vetter H; Kramer HJ; Bokemeyer D
Kidney Blood Press Res 2002[]; 25 (6): 354-62 PMID12590198show ga
BACKGROUND: 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. METHODS: All 26 exons of the human NCCT gene were investigated in 2 German NCCT-deficient patients and their families. Mutation detection was performed by either direct automated sequencing of polymerase chain reaction (PCR)-amplified DNA products or by sequence analysis of cloned PCR products. RESULTS: In a 47-year-old German GS female a novel non-conservative missense mutation (S314F) and a complex deletion/insertion in the NCCT gene were found to be associated with the disorder. A further novel non-conservative substitution (S402F) together with a frequently observed R209W exchange were found in a 19-year-old German GS female. CONCLUSIONS: The observation of a compound heterozygote state in both females affected and the absence of a GS phenotype in their relatives carrying a single mutant allele is consistent with an autosomal recessive pattern of inheritance.