Journal Article

DZNE-2025-00364

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Claudin-16 Deficiency Impairs Tight Junction Function in Ameloblasts, Leading to Abnormal Enamel Formation.

Bardet, C. ; Courson, F. ; Wu, Y. ; Khaddam, M. ; Salmon, B. ; Ribes, S. ; Thumfart, J. ; Yamaguti, P. M. ; Rochefort, G. Y. ; Figueres, M.-L. ; Breiderhoff, T.Extern* ; Garcia-Castaño, A. ; Vallée, B. ; Le Denmat, D. ; Baroukh, B. ; Guilbert, T. ; Schmitt, A. ; Massé, J.-M. ; Bazin, D. ; Lorenz, G. ; Morawietz, M. ; Hou, J. ; Carvalho-Lobato, P. ; Manzanares, M. C. ; Fricain, J.-C. ; Talmud, D. ; Demontis, R. ; Neves, F. ; Zenaty, D. ; Berdal, A. ; Kiesow, A. ; Petzold, M. ; Menashi, S. ; Linglart, A. ; Acevedo, A. C. ; Vargas-Poussou, R. ; Müller, D. ; Houillier, P. ; Chaussain, C.

2016
Oxford University Press [Oxford]

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Please use a persistent id in citations: doi:10.1002/jbmr.2726

Abstract: Claudin-16 protein (CLDN16) is a component of tight junctions (TJ) with a restrictive distribution so far demonstrated mainly in the kidney. Here, we demonstrate the expression of CLDN16 also in the tooth germ and show that claudin-16 gene (CLDN16) mutations result in amelogenesis imperfecta (AI) in the 5 studied patients with familial hypomagnesemia with hypercalciuria and nephrocalcinosis (FHHNC). To investigate the role of CLDN16 in tooth formation, we studied a murine model of FHHNC and showed that CLDN16 deficiency led to altered secretory ameloblast TJ structure, lowering of extracellular pH in the forming enamel matrix, and abnormal enamel matrix protein processing, resulting in an enamel phenotype closely resembling human AI. This study unravels an association of FHHNC owing to CLDN16 mutations with AI, which is directly related to the loss of function of CLDN16 during amelogenesis. Overall, this study indicates for the first time the importance of a TJ protein in tooth formation and underlines the need to establish a specific dental follow-up for these patients.

Keyword(s): Adult (MeSH) ; Ameloblasts: metabolism (MeSH) ; Ameloblasts: pathology (MeSH) ; Amelogenesis Imperfecta: metabolism (MeSH) ; Amelogenesis Imperfecta: pathology (MeSH) ; Animals (MeSH) ; Child (MeSH) ; Claudins: deficiency (MeSH) ; Claudins: genetics (MeSH) ; Dental Enamel: abnormalities (MeSH) ; Dental Enamel: metabolism (MeSH) ; Dental Enamel: pathology (MeSH) ; Female (MeSH) ; Humans (MeSH) ; Hydrogen-Ion Concentration (MeSH) ; Male (MeSH) ; Mice (MeSH) ; Middle Aged (MeSH) ; Mutation: genetics (MeSH) ; Phenotype (MeSH) ; Syndrome (MeSH) ; Tight Junctions: metabolism (MeSH) ; Young Adult (MeSH) ; AMELOGENESIS IMPERFECTA (AI) ; FAMILIAL HYPOMAGNESEMIA WITH HYPERCALCIURIA AND NEPHROCALCINOSIS (FHHNC) ; MMP-20 ; SECRETORY AMELOBLASTS ; pH ; Claudins ; claudin 16

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Research Program(s):

1. 899 - ohne Topic (POF4-899) (POF4-899)

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Database coverage:
; BIOSIS Previews ; Biological Abstracts ; Clarivate Analytics Master Journal List ; Current Contents - Life Sciences ; DEAL Wiley ; Essential Science Indicators ; IF >= 5 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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