title: Mutation of BSND causes Bartter syndrome with sensorineural deafness and kidney failure.
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 alpha-helices and thus might function as a regulator for ion-transport proteins involved in aBS, or else as a new transporter or channel itself.
authors.affiliation: University Children's Hospital, Freiburg University, D-79106 Freiburg, Germany.
authors.forename: R
authors.initials: R
authors.lastname: Birkenhäger
authors.forename: E
authors.initials: E
authors.lastname: Otto
authors.forename: M J
authors.initials: MJ
authors.lastname: Schürmann
authors.forename: M
authors.initials: M
authors.lastname: Vollmer
authors.forename: E M
authors.initials: EM
authors.lastname: Ruf
authors.forename: I
authors.initials: I
authors.lastname: Maier-Lutz
authors.forename: F
authors.initials: F
authors.lastname: Beekmann
authors.forename: A
authors.initials: A
authors.lastname: Fekete
authors.forename: H
authors.initials: H
authors.lastname: Omran
authors.forename: D
authors.initials: D
authors.lastname: Feldmann
authors.forename: D V
authors.initials: DV
authors.lastname: Milford
authors.forename: N
authors.initials: N
authors.lastname: Jeck
authors.forename: M
authors.initials: M
authors.lastname: Konrad
authors.forename: D
authors.initials: D
authors.lastname: Landau
authors.forename: N V
authors.initials: NV
authors.lastname: Knoers
authors.forename: C
authors.initials: C
authors.lastname: Antignac
authors.forename: R
authors.initials: R
authors.lastname: Sudbrak
authors.forename: A
authors.initials: A
authors.lastname: Kispert
authors.forename: F
authors.initials: F
authors.lastname: Hildebrandt
mesh_terms: D000818:Animals; D001477:Bartter Syndrome / Q000150:complications / Q000235:genetics*; D018118:Chloride Channels; D002878:Chromosomes, Human, Pair 1 / Q000235:genetics; D003001:Cloning, Molecular; D004252:DNA Mutational Analysis; D005091:Exons / Q000235:genetics; D005260:Female; D020869:Gene Expression Profiling; D006239:Haplotypes / Q000235:genetics; D006319:Hearing Loss, Sensorineural / Q000150:complications / Q000235:genetics*; D006801:Humans; D017403:In Situ Hybridization; D007668:Kidney / Q000378:metabolism / Q000473:pathology; D008297:Male; D008565:Membrane Proteins / Q000235:genetics*; D051379:Mice; D008969:Molecular Sequence Data; D009154:Mutation / Q000235:genetics*; D020161:Physical Chromosome Mapping; D018807:Polymorphism, Single-Stranded Conformational; D011296:Prenatal Diagnosis; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D051437:Renal Insufficiency / Q000150:complications / Q000235:genetics*
chemical_list: C440005:BSND protein, human; C486687:Bsnd protein, mouse; D018118:Chloride Channels; D008565:Membrane Proteins; D012333:RNA, Messenger