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A clinical phenotype mimicking essential hypertension in a newly discovered family with Liddle's syndrome.

Abstract：

BACKGROUND:Liddle's syndrome (LS) is a monogenic form of hypertension simulating a mineralocorticoid excess, and is currently suspected in young hypokalemic hypertensives. The aims of the study were: (i) to evaluate the clinical phenotype of LS in a newly identified Italian family of Sicilian origin carrying a gain-of-function mutation of the β subunit of the epithelial sodium channel (ENaC) (P617L) previously reported by our group in an apparently unrelated Sicilian patient presenting the typical phenotype of LS including hypokalemia; (ii) to determine whether an unknown biological relationship exists between the newly identified family and the family of the proband previously reported. METHODS:Genetic analysis was performed in the present family, in the individual in which the βP617L mutation was first observed, and in his relatives. RESULTS:βP617L mutation was identified in the proband and in three maternal relatives. None of them showed hypokalemia. Mild to severe early onset hypertension and left ventricular hypertrophy were present in all of them. Analysis of mitochondrial DNA (mtDNA) and Y chromosome profiles in the present family and in the proband's family previously reported showed the absence of a relationship between them. The availability of only one carrier of the mutation in one of the two families meant that a genetic analysis able to assess a founder effect was not feasible. CONCLUSIONS:LS should be considered in all cases of early onset hypertension, independently of the plasma potassium concentration. The incidence of LS may be greater than is currently thought, because hypokalemia is not invariably present.

journal_name

Am J Hypertens

journal_title

American journal of hypertension

authors

Rossi E,Farnetti E,Nicoli D,Sazzini M,Perazzoli F,Regolisti G,Grasselli C,Santi R,Negro A,Mazzeo V,Mantero F,Luiselli D,Casali B

doi

10.1038/ajh.2011.76

subject

Has Abstract

pub_date

2011-08-01 00:00:00

pages

930-5

issue

8

eissn

0895-7061

issn

1941-7225

pii

ajh201176

journal_volume

24

pub_type

杂志文章

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