Smaller and larger deletions of the Williams Beuren syndrome region implicate genes involved in mild facial phenotype, epilepsy and autistic traits

Stefano Vicari, Carmela Fusco, Lucia Micale, Bartolomeo Augello, Maria Teresa Pellico, Deny Menghini, Paolo Alfieri, Barbara Mandriani, Massimo Carella, Orazio Palumbo, Giuseppe Merla

Risultato della ricerca: Contributo in rivistaArticolo in rivista

44 Citazioni (Scopus)

Abstract

Williams Beuren syndrome (WBS) is a multisystemic disorder caused by a hemizygous deletion of 1.5 Mb on chromosome 7q11.23 spanning 28 genes. A few patients with larger and smaller WBS deletion have been reported. They show clinical features that vary between isolated SVAS to the full spectrum of WBS phenotype, associated with epilepsy or autism spectrum behavior. Here we describe four patients with atypical WBS 7q11.23 deletions. Two carry ∼3.5 Mb larger deletion towards the telomere that includes Huntingtin-interacting protein 1 (HIP1) and tyrosine 3-monooxygenase/tryptophan 5-monooxigenase activation protein gamma (YWHAG) genes. Other two carry a shorter deletion of ∼1.2 Mb at centromeric side that excludes the distal WBS genes BAZ1B and FZD9. Along with previously reported cases, genotype-phenotype correlation in the patients described here further suggests that haploinsufficiency of HIP1 and YWHAG might cause the severe neurological and neuropsychological deficits including epilepsy and autistic traits, and that the preservation of BAZ1B and FZD9 genes may be related to mild facial features and moderate neuropsychological deficits. This report highlights the importance to characterize additional patients with 7q11.23 atypical deletions comparing neuropsychological and clinical features between these individuals to shed light on the pathogenic role of genes within and flanking the WBS region. © 2014 Macmillan Publishers Limited.
Lingua originaleEnglish
pagine (da-a)64-70
Numero di pagine7
RivistaEuropean Journal of Human Genetics
Volume22
DOI
Stato di pubblicazionePubblicato - 2014

Keywords

  • 7q11.23
  • Williams Beuren syndrome
  • haploinsufficiency
  • qPCR

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