Hypomagnesemia and nephrocalcinosis in a patient with two heterozygous mutations in the CLDN16 gene

We report the case of a 20-year-old male Caucasian patient with diagnosed nephrocalcinosis and a medical history of seizures and recurrent urinary tract infections. Laboratory investigations revealed clinical and biochemical abnormalities characteristic of familial hypomagnesemia with hypercalciuria...

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Bibliographic Details
Published inJournal of nephrology Vol. 20; no. 1; p. 107
Main Authors Staiger, Katrin, Staiger, Harald, Haas, Carina, Thamer, Claus, Risler, Teut, Machicao, Fausto, Häring, Hans-Ulrich
Format Journal Article
LanguageEnglish
Published Italy 01.01.2007
Subjects
Adult
Claudins
Exons - genetics
Heterozygote
Humans
Hypercalciuria - genetics
Hypercalciuria - urine
Magnesium - blood
Male
Membrane Proteins - genetics
Membrane Proteins - physiology
Mutation - genetics
Nephrocalcinosis - blood
Nephrocalcinosis - genetics
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Summary:We report the case of a 20-year-old male Caucasian patient with diagnosed nephrocalcinosis and a medical history of seizures and recurrent urinary tract infections. Laboratory investigations revealed clinical and biochemical abnormalities characteristic of familial hypomagnesemia with hypercalciuria and nephrocalcinosis (FHHNC). Since FHHNC is caused by mutations in the CLDN16 gene encoding a renal tight junction protein, we sequenced the complete coding region of this gene and detected two heterozygous mutations, the known Leu151Phe (+453G-->T) mutation and a novel Cys120Arg (+358T-->C) mutation. Due to their location within the primary structure of Claudin-16, both mutations are suggested to interfere with renal paracellular magnesium conductance.
ISSN:1121-8428