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Related Experiment Video

Updated: May 11, 2026

Fingerprinting Cardiolipin in Leukocytes by Mass Spectrometry for a Rapid Diagnosis of Barth Syndrome
06:48

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Published on: March 23, 2022

Novel CLCNKB mutations causing Bartter syndrome affect channel surface expression.

Mathilde Keck1, Olga Andrini, Olivier Lahuna

  • 1UPMC Université Paris 06, UMR_S 872, Laboratoire de Génomique, Physiologie et Physiopathologie Rénales, Paris, France.

Human Mutation
|May 25, 2013
PubMed
Summary
This summary is machine-generated.

Mutations in the CLCNKB gene cause Bartter syndrome. This study found two classes of CLCNKB mutations: some cause no current and reduced protein, while others partially reduce current without affecting channel properties or protein levels.

Keywords:
BartterCLCNKBClC familychloride channelkidney

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Published on: June 22, 2022

Area of Science:

  • Nephrology
  • Molecular Biology
  • Genetics

Background:

  • Bartter syndrome is a salt-losing renal tubulopathy caused by mutations in the CLCNKB gene.
  • The ClC-Kb chloride channel is crucial for renal salt reabsorption.

Purpose of the Study:

  • To investigate the functional consequences of seven distinct mutations in the CLCNKB gene.
  • To characterize the impact of these mutations on ClC-Kb channel function and protein expression.

Main Methods:

  • Expression of wild-type and mutant ClC-Kb channels in Xenopus laevis oocytes and HEK293 cells.
  • Electrophysiological recordings to measure channel currents and conductance.
  • Western blot analysis to assess ClC-Kb protein abundance.

Main Results:

  • Four CLCNKB mutations resulted in non-functional channels (no current) in oocytes.
  • Three mutations led to a 30%-60% reduction in channel conductance.
  • All mutations decreased surface expression in oocytes; p.Leu81Pro showed no current in HEK293 cells.
  • Non-conducting mutants exhibited reduced ClC-Kb protein abundance, while partially conducting mutants did not.

Conclusions:

  • CLCNKB mutations causing Bartter syndrome can be classified into two groups: non-conducting mutants with impaired protein expression and partially conducting mutants with preserved channel properties.
  • Understanding these distinct mutation classes is vital for diagnosing and potentially treating Bartter syndrome.