Original article

Pediatric Nephrology

, Volume 10, Issue 4, pp 403-407

First online:

Linkage of Gitelman syndrome to the thiazide-sensitive sodium-chloride cotransporter gene with identification of mutations in Dutch families

  • Henny H. LemminkAffiliated withDepartment of Pediatrics, University of Nijmegen, Nijmegen, The Netherlands
  • , Lambert P. W. J. van den HeuvelAffiliated withDepartment of Pediatrics, University of Nijmegen, Nijmegen, The Netherlands
  • , Henk A. van DijkAffiliated withDepartment of Pediatrics, University of Nijmegen, Nijmegen, The Netherlands
  • , Gerard F. M. MerkxAffiliated withDepartment of Human Genetics, University of Nijmegen, Nijmegen, The Netherlands
  • , Tineke J. SmildeAffiliated withDepartment of Internal Medicine, University of Nijmegen, Nijmegen, The Netherlands
  • , Peter E. M. TaschnerAffiliated withDepartment of Human Genetics, University of Leiden, Leiden, The Netherlands
  • , Leo A. H. MonnensAffiliated withDepartment of Pediatrics, University of Nijmegen, Nijmegen, The Netherlands
  • , Steve C. HebertAffiliated withHarvard Center for Study of Kidney Diseases, Brigham and Women’s Hospital, Boston, USA
  • , Nine V. A. M. KnoersAffiliated withDepartment of Human Genetics, University of Nijmegen, Nijmegen, The Netherlands

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Abstract.

Gitelman syndrome is a mostly autosomal recessive disorder affecting the renal tubular function associated with hypokalemia and hypomagnesemia. Functional studies point to a defect in the distal renal tubule in the thiazide-sensitive, electroneutral sodium-chloride cotransporter (TSC). Based upon the localization of a 2.6 cDNA encoding the human TSC to chromosome 16q13, polymorphic markers spanning the region from 16p12 to 16q21 were tested for linkage to the Gitelman syndrome locus in three Dutch families with autosomal recessive inheritance of this disorder. Using two-point linkage analysis, a maximum LOD score (Zmax of 4.49 (at Θ = 0.00) was found for the marker D16S408. One crucial recombination event places the Gitelman syndrome locus distal to D16S419 at 16q12-13. Subsequently we have tested our group of Gitelman patients for mutations in the human TSC gene. Two mutations were identified in three Gitelman families. Our study confirms that the human TSC gene is involved in Gitelman syndrome. Patients from three Gitelman families reveal two identical human TSC mutations, suggesting these families share a common ancestor.

Key words: Autosomal recessive Gitelman syndrome Thiazide-sensitive sodium-chloride cotransporter Linkage analysis Mutation analysis