Journal
AMERICAN JOURNAL OF MEDICAL GENETICS PART A
Volume 164, Issue 12, Pages 3142-3147Publisher
WILEY
DOI: 10.1002/ajmg.a.36742
Keywords
Smith-Magenis syndrome (SMS); Periventricular nodular heterotopia (PNH); 17p11; 2 chromosomal deletion
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Funding
- European Union Seventh Framework Programme [FP7/2007-2013]
- DESIRE [602531]
- European Research Project [11-027]
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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. (c) 2014 Wiley Periodicals, Inc.
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