barttin CLCNK type accessory subunit beta
Last updated 1 Jul 2022
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The BSND gene provides instructions for making a protein called barttin. This protein is found primarily in the kidneys, where it attaches (binds) to two specific chloride channels: ClC-Ka (produced from the CLCNKA gene) and ClC-Kb (produced from the CLCNKB gene). The ClC-Ka and ClC-Kb channels transport charged atoms of chlorine (chloride ions) out of kidney cells.
Normal function
The BSND gene provides instructions for making a protein called barttin. This protein is found primarily in the kidneys, where it attaches (binds) to two specific chloride channels: ClC-Ka (produced from the CLCNKA gene) and ClC-Kb (produced from the CLCNKB gene). The ClC-Ka and ClC-Kb channels transport charged atoms of chlorine (chloride ions) out of kidney cells.
Barttin is essential for the normal placement of ClC-Ka and ClC-Kb channels in the cell membrane. It also regulates the channels' stability and function. The transport of chloride ions is part of the mechanism by which the kidneys reabsorb salt (sodium chloride or NaCl) from the urine back into the bloodstream. The retention of salt affects the body's fluid levels and helps maintain blood pressure.
Barttin, ClC-Ka, and ClC-Kb are also found in the inner ear, where they play a role in normal hearing.
Conditions referring to this gene or chromosome
Other names
BART
Bartter syndrome, infantile, with sensorineural deafness (Barttin)
barttin
barttin CLCNK-type chloride channel accessory beta subunit
BSND_HUMAN
deafness, autosomal recessive 73
DFNB73
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Further reading and references
- barttin CLCNK type accessory subunit beta; MedlinePlus, National Library of Medicine.
- Birkenhager R, Otto E, Schurmann MJ, Vollmer M, Ruf EM, Maier-Lutz I, Beekmann F, Fekete A, Omran H, Feldmann D, Milford DV, Jeck N, Konrad M, Landau D, Knoers NV, Antignac C, Sudbrak R, Kispert A, Hildebrandt F. Mutation of BSND causes Bartter syndrome with sensorineural deafness and kidney failure. Nat Genet. 2001 Nov;29(3):310-4. doi: 10.1038/ng752.
- Estevez R, Boettger T, Stein V, Birkenhager R, Otto E, Hildebrandt F, Jentsch TJ. Barttin is a Cl- channel beta-subunit crucial for renal Cl- reabsorption and inner ear K+ secretion. Nature. 2001 Nov 29;414(6863):558-61. doi: 10.1038/35107099.
- Hayama A, Rai T, Sasaki S, Uchida S. Molecular mechanisms of Bartter syndrome caused by mutations in the BSND gene. Histochem Cell Biol. 2003 Jun;119(6):485-93. doi: 10.1007/s00418-003-0535-2. Epub 2003 May 22.
- Janssen AG, Scholl U, Domeyer C, Nothmann D, Leinenweber A, Fahlke C. Disease-causing dysfunctions of barttin in Bartter syndrome type IV. J Am Soc Nephrol. 2009 Jan;20(1):145-53. doi: 10.1681/ASN.2008010102. Epub 2008 Sep 5.
- Kramer BK, Bergler T, Stoelcker B, Waldegger S. Mechanisms of Disease: the kidney-specific chloride channels ClCKA and ClCKB, the Barttin subunit, and their clinical relevance. Nat Clin Pract Nephrol. 2008 Jan;4(1):38-46. doi: 10.1038/ncpneph0689.
- Miyamura N, Matsumoto K, Taguchi T, Tokunaga H, Nishikawa T, Nishida K, Toyonaga T, Sakakida M, Araki E. Atypical Bartter syndrome with sensorineural deafness with G47R mutation of the beta-subunit for ClC-Ka and ClC-Kb chloride channels, barttin. J Clin Endocrinol Metab. 2003 Feb;88(2):781-6. doi: 10.1210/jc.2002-021398.
- Riazuddin S, Anwar S, Fischer M, Ahmed ZM, Khan SY, Janssen AG, Zafar AU, Scholl U, Husnain T, Belyantseva IA, Friedman PL, Riazuddin S, Friedman TB, Fahlke C. Molecular basis of DFNB73: mutations of BSND can cause nonsyndromic deafness or Bartter syndrome. Am J Hum Genet. 2009 Aug;85(2):273-80. doi: 10.1016/j.ajhg.2009.07.003. Epub 2009 Jul 30.
- Scholl U, Hebeisen S, Janssen AG, Muller-Newen G, Alekov A, Fahlke C. Barttin modulates trafficking and function of ClC-K channels. Proc Natl Acad Sci U S A. 2006 Jul 25;103(30):11411-6. doi: 10.1073/pnas.0601631103. Epub 2006 Jul 18.
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