Epilepsy is a possible feature in Williams-Beuren syndrome patients harboring typical deletions of the 7q11.23 critical region

Francesco Nicita, Giacomo Garone, Alberto Spalice, Salvatore Savasta, Pasquale Striano, Chiara Pantaleoni, Maria Valentina Spartà, Gerhard Kluger, Giuseppe Capovilla, D. Pruna, Elena Freri, Stefano D'Arrigo, Alberto Verrotti

Research output: Contribution to journalArticle

Abstract

Seizures are rarely reported in Williams-Beuren syndrome (WBS)-a contiguous-gene-deletion disorder caused by a 7q11.23 heterozygous deletion of 1.5-1.8Mb-and no previous study evaluated electro-clinical features of epilepsy in this syndrome. Furthermore, it has been hypothesized that atypical deletion (e.g., larger than 1.8Mb) may be responsible for a more pronounced neurological phenotypes, especially including seizures. Our objectives are to describe the electro-clinical features in WBS and to correlate the epileptic phenotype with deletion of the 7q11.23 critical region. We evaluate the electro-clinical features in one case of distal 7q11.23 deletion syndrome and in eight epileptic WBS (eWBS) patients. Additionally, we compare the deletion size-and deleted genes-of four epileptic WBS (eWBS) with that of four non-epileptic WBS (neWBS) patients. Infantile spasms, focal (e.g., motor and dyscognitive with autonomic features) and generalized (e.g., tonic-clonic, tonic, clonic, myoclonic) seizures were encountered. Drug-resistance was observed in one patient. Neuroimaging discovered one case of focal cortical dysplasia, one case of fronto-temporal cortical atrophy and one case of periventricular nodular heterotopia. Comparison of deletion size between eWBS and neWBS patients did not reveal candidate genes potentially underlying epilepsy. This is the largest series describing electro-clinical features of epilepsy in WBS. In WBS, epilepsy should be considered both in case of typical and atypical deletions, which do not involve HIP1, YWHAG or MAGI2.

Original languageEnglish
Pages (from-to)148-155
Number of pages8
JournalAmerican Journal of Medical Genetics, Part A
Volume170
Issue number1
DOIs
Publication statusPublished - Jan 1 2016

Keywords

  • Distal 7q11.23 deletion syndrome
  • EEG
  • Elastin
  • HIP1
  • Seizures

ASJC Scopus subject areas

  • Genetics(clinical)
  • Genetics

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