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Original Articles

KCNJ5 Mutations in European Families With Nonglucocorticoid Remediable Familial Hyperaldosteronism

Paolo Mulatero, Philipp Tauber, Maria-Christina Zennaro, Silvia Monticone, Katharina Lang, Felix Beuschlein, Evelyn Fischer, Davide Tizzani, Anna Pallauf, Andrea Viola, Laurence Amar, Tracy Ann Williams, Tim M. Strom, Elisabeth Graf, Sascha Bandulik, David Penton, Pierre-François Plouin, Richard Warth, Bruno Allolio, Xavier Jeunemaitre, Franco Veglio, Martin Reincke
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https://doi.org/10.1161/HYPERTENSIONAHA.111.183996
Hypertension. 2011;HYPERTENSIONAHA.111.183996
Originally published December 27, 2011
Paolo Mulatero
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Philipp Tauber
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Maria-Christina Zennaro
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Silvia Monticone
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Katharina Lang
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Felix Beuschlein
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Evelyn Fischer
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Davide Tizzani
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Anna Pallauf
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Andrea Viola
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Laurence Amar
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Tracy Ann Williams
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Tim M. Strom
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Elisabeth Graf
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Sascha Bandulik
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David Penton
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Pierre-François Plouin
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Richard Warth
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Bruno Allolio
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Xavier Jeunemaitre
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Franco Veglio
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Martin Reincke
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Abstract

Primary aldosteronism is the most frequent cause of endocrine hypertension. Three forms of familial hyperaldosteronism (FH) have been described, named FH-I to -III. Recently, a mutation of KCNJ5 has been shown to be associated with FH-III, whereas the cause of FH-II is still unknown. In this study we searched for mutations in KCNJ5 in 46 patients from 21 families with FH, in which FH-I was excluded. We identified a new germline G151E mutation in 2 primary aldosteronism–affected subjects from an Italian family and 3 somatic mutations in aldosterone-producing adenomas, T158A described previously as a germline mutation associated with FH-III, and G151R and L168R both described as somatic mutations in aldosterone-producing adenoma. The phenotype of the family with the G151E mutation was remarkably milder compared with the previously described American family, in terms of both clinical and biochemical parameters. Furthermore, patients with somatic KCNJ5 mutations displayed a phenotype indistinguishable from that of sporadic primary aldosteronism. The functional characterization of the effects of the G151E mutation in vitro showed a profound alteration of the channel function, with loss of K+ selectivity, Na+ influx, and membrane depolarization. These alterations have been postulated to be responsible for voltage gate Ca2+ channel activation, increase in cytosolic calcium, and stimulation of aldosterone production and adrenal cell proliferation. In conclusion, we describe herein a new mutation in the KCNJ5 potassium channel associated with FH-III, responsible for marked alterations of channel function but associated with a mild clinical and hormonal phenotype.

  • familial hyperaldosteronism
  • endocrine hypertension
  • primary aldosteronism
  • aldosterone
  • KCNJ5
  • Received September 27, 2011.
  • Revision received October 10, 2011.
  • Accepted November 27, 2011.
  • © 2011 American Heart Association, Inc.
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    KCNJ5 Mutations in European Families With Nonglucocorticoid Remediable Familial Hyperaldosteronism
    Paolo Mulatero, Philipp Tauber, Maria-Christina Zennaro, Silvia Monticone, Katharina Lang, Felix Beuschlein, Evelyn Fischer, Davide Tizzani, Anna Pallauf, Andrea Viola, Laurence Amar, Tracy Ann Williams, Tim M. Strom, Elisabeth Graf, Sascha Bandulik, David Penton, Pierre-François Plouin, Richard Warth, Bruno Allolio, Xavier Jeunemaitre, Franco Veglio and Martin Reincke
    Hypertension. 2011;HYPERTENSIONAHA.111.183996, originally published December 27, 2011
    https://doi.org/10.1161/HYPERTENSIONAHA.111.183996

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    KCNJ5 Mutations in European Families With Nonglucocorticoid Remediable Familial Hyperaldosteronism
    Paolo Mulatero, Philipp Tauber, Maria-Christina Zennaro, Silvia Monticone, Katharina Lang, Felix Beuschlein, Evelyn Fischer, Davide Tizzani, Anna Pallauf, Andrea Viola, Laurence Amar, Tracy Ann Williams, Tim M. Strom, Elisabeth Graf, Sascha Bandulik, David Penton, Pierre-François Plouin, Richard Warth, Bruno Allolio, Xavier Jeunemaitre, Franco Veglio and Martin Reincke
    Hypertension. 2011;HYPERTENSIONAHA.111.183996, originally published December 27, 2011
    https://doi.org/10.1161/HYPERTENSIONAHA.111.183996
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