Periventricular nodular heterotopia in Smith-Magenis syndrome.

TitlePeriventricular nodular heterotopia in Smith-Magenis syndrome.
Publication TypeJournal Article
Year of Publication2014
AuthorsCapra, Valeria, Biancheri Roberta, Morana Giovanni, Striano Pasquale, Novara Francesca, Ferrero Giovanni Battista, Boeri Luca, Celle Maria Elena, Mancardi Maria Margherita, Zuffardi Orsetta, Parrini Elena, and Guerrini Renzo
JournalAmerican journal of medical genetics. Part A
Date Published2014 Dec

Smith-Magenis syndrome (SMS) is caused by an interstitial microdeletion of chromosome 17p11.2. A few patients with the typical SMS phenotype have RAI1 gene mutations. The syndrome is characterized by minor craniofacial anomalies, short stature, sleep disturbances, behavioural and neurocognitive abnormalities, as well as variable multisystemic manifestations. Periventricular nodular heterotopia (PNH) is a genetically heterogeneous neuronal migration disorder characterized by subependymal heterotopic nodules, and is variably associated with other brain malformations, epileptic seizures and intellectual disability. Here we report on two patients harboring deletions of the 17p11.2 region in whom the SMS typical phenotype was associated with bilateral PNH. Our observations expand the spectrum of chromosomal rearrangements associated with PNH and indicate that abnormal neuronal migration may contribute to the neurocognitive phenotype of SMS.

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Alternate JournalAm. J. Med. Genet. A