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Phenotype in 18 Danish subjects with genetically verified CHARGE syndrome

Authors

  • E Husu,

    Corresponding author
    1. Department of Clinical Genetics, Unit for Rare Diseases, Rigshospitalet, Copenhagen University Hospital, Copenhagen, Denmark
    2. Raredis Database, Copenhagen, Denmark
      Att: Edith Husu, Rigshospitalet, Afs: 3342, Blegdamsvej 9, 2100 Copenhagen East, Denmark.
      Tel.: +4540340228/+4535456135;
      fax: +4535456138;
      e-mail: edithhusu@gmail.com
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  • HD Hove,

    1. Department of Clinical Genetics, Unit for Rare Diseases, Rigshospitalet, Copenhagen University Hospital, Copenhagen, Denmark
    2. Raredis Database, Copenhagen, Denmark
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  • S Farholt,

    1. Department of Paediatrics, Centre for Rare Diseases, Aarhus University Hospital Skejby, Aarhus, Denmark
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  • M Bille,

    1. Department of Audiology, Copenhagen University Hospital Gentofte, Copenhagen, Denmark
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  • L Tranebjærg,

    1. Department of Audiology, Bispebjerg Hospital, Copenhagen, Denmark
    2. Wilhelm Johannesen Centre for Functional Genome Research, ICMM, The Panum Institute, University of Copenhagen, Copenhagen, Denmark
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  • I Vogel,

    1. Department of Clinical Genetics, Aarhus University Hospital, Aarhus, Denmark
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  • S Kreiborg

    1. Department of Clinical Genetics, Unit for Rare Diseases, Rigshospitalet, Copenhagen University Hospital, Copenhagen, Denmark
    2. Raredis Database, Copenhagen, Denmark
    3. 3D Craniofacial Image Research Laboratory, The Panum Institute, Copenhagen, Denmark
    4. Department of Paediatric Dentistry and Clinical Genetics, University of Copenhagen, Copenhagen, Denmark
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Att: Edith Husu, Rigshospitalet, Afs: 3342, Blegdamsvej 9, 2100 Copenhagen East, Denmark.
Tel.: +4540340228/+4535456135;
fax: +4535456138;
e-mail: edithhusu@gmail.com

Abstract

Husu E, Hove HD, Farholt S, Bille M, Tranebjærg L, Vogel I, Kreiborg S. Phenotype in 18 Danish subjects with genetically verified CHARGE syndrome.

CHARGE (coloboma of the eye, heart defects, choanal atresia, retarded growth and development, genital hypoplasia and ear anomalies and/or hearing loss) syndrome is a rare genetic, multiple-malformation syndrome. About 80% of patients with a clinical diagnose, have a mutation or a deletion in the gene encoding chromodomain helicase DNA-binding protein 7 (CHD7). Genotype–phenotype correlation is only partly known. In this nationwide study, phenotypic characteristics of 18 Danish CHD7 mutation positive CHARGE individuals (N = 18) are presented. We studied patient records, clinical photographs, computed tomography, and magnetic resonance imaging (MRI). Information was not available for all traits in all subjects. Therefore, the results are presented as fractions. The following prevalence of cardinal symptoms were found: coloboma, 16/17; heart defects, 14/18; choanal atresia, 7/17; retarded growth and development, 11/13; genital abnormalities, 5/18; ear anomalies, 15/17 and sensorineural hearing loss, 14/15. Vestibular dysfunction (10/13) and swallowing problems (12/15) were other frequent cranial nerve dysfunctions. Three-dimensional reconstructions of MRI scans showed temporal bone abnormalities in >85%. CHARGE syndrome present a broad phenotypic spectrum, although some clinical features are more frequently occurring than others. Here, we suggest that genetic testing for CHD7 mutation should be considered in neonates with a specific combination of several clinical symptoms.

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