Liddle's syndrome caused by a novel missense mutation (P617L) of the epithelial sodium channel β subunit

Ermanno Rossi, Enrico Farnetti, Anne Debonneville, Davide Nicoli, Chiara Grasselli, Giuseppe Regolisti, Aurelio Negro, Franco Perazzoli, Bruno Casali, Franco Mantero, Olivier Staub

Research output: Contribution to journalArticlepeer-review

Abstract

OBJECTIVE: The aim of the study was to search for mutations of SCNN1B and SCNN1G in an Italian family with apparently dominant autosomal transmission of a clinical phenotype consistent with Liddle's syndrome. METHODS: Genetic analysis was performed in the proband, his relatives, and 100 control subjects. To determine the functional role of the mutation identified in the proband, we expressed the mutant or wild-type epithelial sodium channel in Xenopus laevis oocytes. RESULTS: A novel point mutation, causing an expected substitution of a leucine residue for the second proline residue of the conserved PY motif (PPP x Y) of the β subunit was identified in the proband. The functional expression of the mutant epithelial sodium channel in X. laevis oocytes showed a three-fold increase in the amiloride-sensitive current as compared with that of the wild-type channel. CONCLUSION: This newly identified mutation adds to other missense mutations of the PY motif of the β subunit of the epithelial sodium channel, thus confirming its crucial role in the regulation of the epithelial sodium channel. To our knowledge, this is the first report of Liddle's syndrome in the Italian population, confirmed by genetic and functional analysis, with the identification of a gain-of-function mutation not previously reported.

Original languageEnglish
Pages (from-to)921-927
Number of pages7
JournalJournal of Hypertension
Volume26
Issue number5
DOIs
Publication statusPublished - May 2008

Keywords

  • Amiloride-sensitive current
  • Epithelial sodium channel
  • Epithelial sodium channel β subunit
  • Hypertension
  • Hypokalemia
  • Liddle's syndrome

ASJC Scopus subject areas

  • Internal Medicine
  • Endocrinology

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