{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,18]],"date-time":"2026-09-18T19:13:36Z","timestamp":1789758816847,"version":"4.0.1"},"reference-count":18,"publisher":"The Endocrine Society","issue":"8","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2006,8,1]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>Context: Familial hypomagnesemia with hypercalciuria and nephrocalcinosis (FHHNC) is caused by a dysfunction of Claudin-16 (CLDN16) and characterized by renal wasting of Mg2+ and Ca2+.<\/jats:p><jats:p>Objective: The objectives of this study were to study the clinical parameters in suspected FHHNC patients, identify mutations in the CLDN16 gene, and analyze molecular defects associated with the mutant protein.<\/jats:p><jats:p>Design, Setting, and Participants: CLDN16 genes from two siblings diagnosed with FHHNC were sequenced. Expression and characterization of the mutant protein in renal MDCK cells were studied.<\/jats:p><jats:p>Outcome Measures: Standard urine and serum parameters to diagnose FHHNC were determined. Mutations in the CLDN16 gene were identified. The subcellular distribution of the mutant protein was analyzed by immunofluorescence microscopy.<\/jats:p><jats:p>Results: Urine and blood analysis showed signs typical for FHHNC. One patient, in addition, presented with hypocalcemic tetany, a phenomenon so far not described for FHHNC. Both siblings carry a novel mutation in CLDN16, Y207X. The review of medical records showed that hypocalcemia is not uncommon in the early childhood of FHHNC patients. Expressed in MDCK cells, the Y207X mutant is not detected at tight junctions but instead is found in lysosomes and, to a lesser extent, the endoplasmic reticulum. Surface expression can be rescued by inhibiting clathrin-mediated internalization.<\/jats:p><jats:p>Conclusions: We propose that mutations in CLDN16 are considered in childhood hypocalcemia. CLDN16 Y207X is transiently delivered to the plasma membrane but not retained and is rapidly retrieved by internalization. Inhibitors of endocytosis may provide novel therapeutic strategies.<\/jats:p>","DOI":"10.1210\/jc.2006-0200","type":"journal-article","created":{"date-parts":[[2006,5,17]],"date-time":"2006-05-17T01:33:26Z","timestamp":1147829606000},"page":"3076-3079","source":"Crossref","is-referenced-by-count":37,"title":["Unusual Clinical Presentation and Possible Rescue of a Novel Claudin-16 Mutation"],"prefix":"10.1210","volume":"91","author":[{"given":"Dominik","family":"Mu\u0308ller","sequence":"first","affiliation":[{"name":"Department of Pediatric Nephrology (D.M., J.T.), Charite\u0301 Children\u2019s Hospital and Center for Cardiovascular Research, 12200 Berlin, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"P. Jaya","family":"Kausalya","sequence":"additional","affiliation":[{"name":"Epithelial Cell Biology Laboratory (P.J.K., W.H.), Institute of Molecular and Cell Biology, Singapore 138673"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Detlef","family":"Bockenhauer","sequence":"additional","affiliation":[{"name":"Great Ormond Street Hospital for Children National Health Service Trust (D.B., W.v.H.), London WC1N 3JH, United Kingdom"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Julia","family":"Thumfart","sequence":"additional","affiliation":[{"name":"Department of Pediatric Nephrology (D.M., J.T.), Charite\u0301 Children\u2019s Hospital and Center for Cardiovascular Research, 12200 Berlin, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Iwan C.","family":"Meij","sequence":"additional","affiliation":[{"name":"Max-Delbrueck-Centre for Molecular Medicine (I.C.M.), 12200 Berlin, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Michael J.","family":"Dillon","sequence":"additional","affiliation":[{"name":"Institute of Child Health (M.J.D.), London WC1N 3JH, United Kingdom"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"William van\u2019t","family":"Hoff","sequence":"additional","affiliation":[{"name":"Great Ormond Street Hospital for Children National Health Service Trust (D.B., W.v.H.), London WC1N 3JH, United Kingdom"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Walter","family":"Hunziker","sequence":"additional","affiliation":[{"name":"Epithelial Cell Biology Laboratory (P.J.K., W.H.), Institute of Molecular and Cell Biology, Singapore 138673"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"80","reference":[{"key":"2020071613374601600_R1","doi-asserted-by":"crossref","first-page":"285","DOI":"10.1038\/35067088","article-title":"Multifunctional strands in tight 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