• Dimitar N Azmanov, Sashka Zhelyazkova, Petya S Dimova, Melania Radionova, Veneta Bojinova, Laura Florez, Shelagh J Smith, Ivailo Tournev, Assen Jablensky, John Mulley, Ingrid Scheffer, Luba Kalaydjieva, and Josemir W Sander.
• Laboratory for Molecular Genetics, Centre for Medical Research and Western Australian Institute for Medical Research, The University of Western Australia, Perth, Australia. dazmanov@waimr.uwa.edu.au
• Epileptic Disord. 2010 Jun 1; 12 (2): 117-24.

AbstractSCN1A mutations account for a large proportion of Dravet syndrome patients, and are reported in other cases of epilepsy, such as some families with genetic epilepsy with febrile seizures plus (GEFS+). While most Dravet syndrome cases are caused by de novo mutations, 5% inherit a mutation from a mildly affected or symptom-free parent. Parental mosaicism has been identified, with documented cases involving truncating mutations or gene rearrangements. We describe a Roma/Gypsy family, where a missense mutation in SCN1A, p.D194N, is transmitted from a mosaic GEFS+ father to a child with Dravet syndrome. Mosaicism may be more common than assumed and should be considered regardless of the nature of the mutation.

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