Osteosclerotic bone dysplasia in siblings with a Fam20C mutation

Authors

  • M Fradin,

    Corresponding author
    1. Service de Génétique Médicale, CHU Strasbourg, Hôpital de Hautepierre, Avenue Molière, Strasbourg, France
      Melanie Fradin, Service de Génétique Médicale, CHU Strasbourg, Hôpital de Hautepierre, Avenue Molière, 67098 Strasbourg, France.
      Tel.: +330 388128120;
      fax: +330 388128125;
      e-mail: melanie.fradin@chru-strasbourg.fr
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  • C Stoetzel,

    1. Laboratoire de Génétique Médicale EA3949, Equipe AVENIR-Inserm, Faculté de Médecine, Université de Strasbourg, Strasbourg, France
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  • J Muller,

    1. Laboratoire de Diagnostic Génétique, CHU Strasbourg, Nouvel Hôpital Civil, Strasbourg, France
    2. Institut de Génétique et de Biologie Moléculaire et Cellulaire (IGBMC), CNRS, INSERM, Université de Strasbourg, Illkirch-Graffenstaden, France
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  • M Koob,

    1. Service de Radiologie 2, CHU Strasbourg, Hôpital de Hautepierre, Strasbourg, France
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  • D Christmann,

    1. Service de Radiologie 2, CHU Strasbourg, Hôpital de Hautepierre, Strasbourg, France
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  • C Debry,

    1. Service d’Oto-Rhino-Laryngologie, CHU Strasbourg, Hôpital de Hautepierre, Avenue Molière, Strasbourg, France
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  • M Kohler,

    1. Département d’Echographie et de Médecine Fœtale, CMCO-SIHCUS, Schiltigheim, France
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  • M Isnard,

    1. Service de Gynécologie Obstétrique, Hôpital de Belfort-Montbéliard, Belfort, France
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  • D Astruc,

    1. Service de Réanimation Pédiatrique Spécialisée-Surveillance Continue, Pédiatrie 2, CHU Strasbourg, Hôpital de Hautepierre, Avenue Molière, Strasbourg, France
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  • P Desprez,

    1. Service de Réanimation Pédiatrique Spécialisée-Surveillance Continue, Pédiatrie 2, CHU Strasbourg, Hôpital de Hautepierre, Avenue Molière, Strasbourg, France
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  • C Zorres,

    1. Service de Réanimation Pédiatrique Spécialisée-Surveillance Continue, Pédiatrie 2, CHU Strasbourg, Hôpital de Hautepierre, Avenue Molière, Strasbourg, France
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  • E Flori,

    1. Service de Cytogénétique, CHU Strasbourg, Hôpital de Hautepierre, Avenue Molière, Strasbourg, France
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  • H Dollfus,

    1. Service de Génétique Médicale, CHU Strasbourg, Hôpital de Hautepierre, Avenue Molière, Strasbourg, France
    2. Laboratoire de Génétique Médicale EA3949, Equipe AVENIR-Inserm, Faculté de Médecine, Université de Strasbourg, Strasbourg, France
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  • B Doray

    1. Service de Génétique Médicale, CHU Strasbourg, Hôpital de Hautepierre, Avenue Molière, Strasbourg, France
    2. Laboratoire de Génétique Médicale EA3949, Equipe AVENIR-Inserm, Faculté de Médecine, Université de Strasbourg, Strasbourg, France
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Melanie Fradin, Service de Génétique Médicale, CHU Strasbourg, Hôpital de Hautepierre, Avenue Molière, 67098 Strasbourg, France.
Tel.: +330 388128120;
fax: +330 388128125;
e-mail: melanie.fradin@chru-strasbourg.fr

Abstract

Fradin M, Stoetzel C, Muller J, Koob M, Christmann D, Debry C, Kohler M, Isnard M, Astruc D, Desprez P, Zorres C, Flori E, Dollfus H, Doray B. Osteosclerotic bone dysplasia in siblings with a Fam20C mutation.

Raine syndrome is an autosomal recessive disorder caused by mutations in the FAM20C gene. FAM20C codes for the human homolog of DMP4, a dentin matrix protein highly expressed in odontoblasts and moderately in bone. DMP4 is probably playing a role in the mineralization process. Since the first case reported in 1989 by Raine et al. 21 cases have been published delineating a phenotype which associates dysmorphic features, cerebral calcifications, choanal atresia or stenosis and thoracic/pulmonary hypoplasia. Kan and Kozlowski suggested the name of Raine syndrome to describe this new lethal osteosclerotic bone dysplasia. All the cases described were lethal during the neonatal period except for the last two reported patients aged 8 and 11 years who presented severe mental retardation. Here we describe two sisters, with an attenuated phenotype of Raine syndrome, who present an unexpectedly normal psychomotor development at ages 4 and 1, respectively. Identification of a homozygous mutation in the FAM20C gene confirmed the Raine syndrome diagnosis, thus contributing to the expansion of the Raine syndrome phenotype. This case report also prompted us to revisit the FAM20 gene classification and allowed us to highlight the ancestral status of Fam20C.

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