Molecular and phenotypic characterization of atypical Williams–Beuren syndrome

Authors

  • J. Euteneuer,

    1. Department of Pediatrics, Washington University School of Medicine, St. Louis, MO, USA
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  • C.M.B. Carvalho,

    1. Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX, USA
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  • S. Kulkarni,

    1. Department of Pathology and Immunology, Washington University School of Medicine, St. Louis, MO, USA
    2. Division of Genetics and Genomic Medicine, Department of Pediatrics, Washington University School of Medicine, St. Louis, MO, USA
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  • M. Vineyard,

    1. Division of Genetics and Genomic Medicine, Department of Pediatrics, Washington University School of Medicine, St. Louis, MO, USA
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  • R. Mark Grady,

    1. Division of Cardiology, Washington University School of Medicine, St. Louis, MO, USA
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  • J.R. Lupski,

    1. Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX, USA
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  • M. Shinawi

    Corresponding author
    1. Division of Genetics and Genomic Medicine, Department of Pediatrics, Washington University School of Medicine, St. Louis, MO, USA
    • Corresponding author: Marwan Shinawi, MD, FACMG, Division of Genetics and Genomic Medicine, Department of Pediatrics, Washington University School of Medicine, One Children's Place, Northwest Tower, 9132 Campus Box 8116, St. Louis, MO 63110, USA.

      Tel.: +1 314 747 1837;

      fax: +1 314 454 2075;

      e-mail: Shinawi_M@kids.wustl.edu

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  • The authors declare no conflict of interest.

Abstract

Williams–Beuren syndrome (WBS) is a multisystemic genomic disorder typically caused by a recurrent ˜1.5–1.8 Mb deletion on 7q11.23. Atypical deletions can provide important insight into the genotype–phenotype correlations. Here, we report the phenotypic and molecular characterization of a girl with a de novo 81.8 kb deletion in the WBS critical region, which involves the ELN and LIMK1 genes only. The patient presented at 2 months of age with extensive vascular abnormalities, mild facial dysmorphism and delays in her fine motor skills. We discuss potential molecular mechanisms and the role of ELN and LIMK1 in the different phenotypic features. We compare the findings in our patient with previously reported overlapping deletions. The phenotypic variability among these patients suggests that other factors are important in the phenotype and possibly include: position effects related to copy number variation size, variations in the non-deleted alleles, genetic modifiers elsewhere in the genome, or reduced penetrance for specific phenotypes.

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