Mutation of BSND causes Bartter syndrome with sensorineural deafness and kidney failure

Ralf Birkenhäger, Edgar Otto, Maria J. Schürmann, Martin Vollmer, Eva Maria Ruf, Irina Maier-Lutz, Frank Beekmann, Andrea Fekete, Heymut Omran, Delphine Feldmann, David V. Milford, Nicola Jeck, Martin Konrad, Daniel Landau, Nine V.A.M. Knoers, Corinne Antignac, Ralf Sudbrak, Andreas Kispert, Friedhelm Hildebrandt*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Antenatal Bartter syndrome (aBS) comprises a heterogeneous group of autosomal recessive salt-losing nephropathies. Identification of three genes that code for renal transporters and channels as responsible for aBS has resulted in new insights into renal salt handling, diuretic action and blood-pressure regulation. A gene locus of a fourth variant of aBS called BSND, which in contrast to the other forms is associated with sensorineural deafness (SND) and renal failure, has been mapped to chromosome 1p. We report here the identification by positional cloning, in a region not covered by the human genome sequencing projects, of a new gene, BSND, as the cause of BSND. We examined ten families with BSND and detected seven different mutations in BSND that probably result in loss of function. In accordance with the phenotype, BSND is expressed in the thin limb and the thick ascending limb of the loop of Henle in the kidney and in the dark cells of the inner ear. The gene encodes a hitherto unknown protein with two putative transmembrane α-helices and thus might function as a regulator for ion-transport proteins involved in aBS, or else as a new transporter or channel itself.

Original languageEnglish
Pages (from-to)310-314
Number of pages5
JournalNature Genetics
Volume29
Issue number3
DOIs
StatePublished - 2001
Externally publishedYes

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