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

Schossig, Anna; Bloch-Zupan, Agnès; Lussi, Adrian; Wolf, Nicole I; Raskin, Salmo; Cohen, Monika; Giuliano, Fabienne; Jurgens, Julie; Krabichler, Birgit; Koolen, David A; de Macena Sobreira, Nara Lygia; Maurer, Elisabeth; Muller-Bolla, Michèle; Penzien, Johann; Zschocke, Johannes; Kapferer-Seebacher, Ines (2017). SLC13A5 is the second gene associated with Kohlschütter-Tönz syndrome. Journal of medical genetics, 54(1), pp. 54-62. BMJ Publishing Group 10.1136/jmedgenet-2016-103988

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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.

Item Type:

Journal Article (Original Article)

Division/Institute:

04 Faculty of Medicine > School of Dental Medicine > Department of Preventive, Restorative and Pediatric Dentistry

UniBE Contributor:

Lussi, Adrian

Subjects:

600 Technology > 610 Medicine & health

ISSN:

0022-2593

Publisher:

BMJ Publishing Group

Language:

English

Submitter:

Hendrik Meyer-Lückel

Date Deposited:

23 Jul 2019 16:06

Last Modified:

23 Jul 2019 16:06

Publisher DOI:

10.1136/jmedgenet-2016-103988

PubMed ID:

27600704

Uncontrolled Keywords:

Amelogenesis imperfecta Epilepsy and seizures Kohlschütter-Tönz syndrome Molecular genetics

URI:

https://boris.unibe.ch/id/eprint/122931

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