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J Med Genet. 2017 Jan;54(1):54-62. doi: 10.1136/jmedgenet-2016-103988. Epub 2016 Sep 6.

SLC13A5 is the second gene associated with Kohlschütter-Tönz syndrome.

Author information

1
Division of Human Genetics, Medical University of Innsbruck, Innsbruck, Austria.
2
Faculté de Chirurgie Dentaire, Université de Strasbourg, Strasbourg, France.
3
Pôle de Médecine et Chirurgie Bucco-dentaires, Centre de Référence des Manifestations Odontologiques des Maladies Rares, Hôpitaux Universitaires de Strasbourg (HUS), Strasbourg, France.
4
Institut de Génétique et de Biologie Moléculaire and Cellulaire-Centre Européen de Recherche en Biologie et en Médecine, Université de Strasbourg, IGBMC-CERBM CNRS UMR7104, INSERM U964, Illkirch, France.
5
Department of Preventive, Restorative and Pediatric Dentistry, School of Dental Medicine, University of Bern, Bern, Switzerland.
6
Department of Child Neurology, VU University Medical Center, Neuroscience Campus Amsterdam, Amsterdam, The Netherlands.
7
Pontifícia Universidade Católica do Paraná (PUCPR), Curitiba, Brazil.
8
Genetika-Centro de Aconselhamento e Laboratório de Genética, Curitiba, Brazil.
9
kbo-Kinderzentrum München gGmbH, Munich, Germany.
10
Centre de Référence Anomalies du Développement et Syndromes Malformatifs PACA, Service de Génétique Médicale, CHU Nice, Nice, France.
11
McKusick-Nathans Institute of Genetic Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA.
12
Department of Human Genetics, Radboud Institute for Molecular Life Sciences and Donders Institute for Brain, Cognition and Behaviour, Radboud University Medical Center, Nijmegen, The Netherlands.
13
UFR Odontologie, Département d'Odontologie Pédiatrique, Université de Nice Sophia-Antipolis, UCA, Nice, France.
14
CHU de Nice, Pôle Odontologie, UF soins pour enfants; Laboratory URB2i-EA 4462, Paris Descartes, France.
15
Department of Neuropaediatrics, Klinikum Augsburg, Augsburg, Germany.
16
Department of Operative and Restorative Dentistry, Medical University of Innsbruck, Innsbruck, Austria.

Abstract

BACKGROUND:

Kohlschütter-Tönz syndrome (KTZS) is a rare autosomal-recessive disease characterised by epileptic encephalopathy, intellectual disability and amelogenesis imperfecta (AI). It is frequently caused by biallelic mutations in ROGDI. Here, we report on individuals with ROGDI-negative KTZS carrying biallelic SLC13A5 mutations.

METHODS:

In the present cohort study, nine individuals from four families with the clinical diagnosis of KTZS and absence of ROGDI mutations as well as one patient with unexplained epileptic encephalopathy were investigated by clinical and dental evaluation, parametric linkage analysis (one family), and exome and/or Sanger sequencing. Dental histological investigations were performed on teeth from individuals with SLC13A5-associated and ROGDI-associated KTZS.

RESULTS:

Biallelic mutations in SLC13A5 were identified in 10 affected individuals. Epileptic encephalopathy usually presents in the neonatal and (less frequently) early infantile period. Yellowish to orange discolouration of both deciduous and permanent teeth, as well as wide interdental spaces and abnormal crown forms are major clinical signs of individuals with biallelic SLC13A5 mutations. Histological dental investigations confirmed the clinical diagnosis of hypoplastic AI. In comparison, the histological evaluation of a molar assessed from an individual with ROGDI-associated KTZS revealed hypocalcified AI.

CONCLUSIONS:

We conclude that SLC13A5 is the second major gene associated with the clinical diagnosis of KTZS, characterised by neonatal epileptic encephalopathy and hypoplastic AI. Careful clinical and dental delineation provides clues whether ROGDI or SLC13A5 is the causative gene. Hypersensitivity of teeth as well as high caries risk requires individual dental prophylaxis and attentive dental management.

KEYWORDS:

Amelogenesis imperfecta; Epilepsy and seizures; Kohlschütter-Tönz syndrome; Molecular genetics

PMID:
27600704
DOI:
10.1136/jmedgenet-2016-103988
[Indexed for MEDLINE]

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