Familial neonatal seizures with intellectual disability caused by a microduplication of chromosome 2q24.3.

Abstract	A family with dominantly inherited neonatal seizures and intellectual disability was atypical for neonatal and infantile seizure syndromes associated with potassium (KCNQ2 and KCNQ3) and sodium (SCN2A) channel mutations. Microsatellite markers linked to KCNQ2, KCNQ3, and SCN2A were examined to exclude candidate locations, but instead revealed a duplication detected by observation of three alleles for two markers flanking SCN2A. Characterization revealed a 1.57 Mb duplication at 2q24.3 containing eight genes including SCN2A, SCN3A, and the 3¢ end of SCN1A. The duplication was partially inverted and inserted within or near SCN1A, probably affecting the expression levels of associated genes, including sodium channels. Rare or unique microchromosomal copy number mutations might underlie familial epilepsies that do not fit within the clinical criteria for the established syndromes.
Authors	Sarah E Heron, Ingrid E Scheffer, Bronwyn E Grinton, Helen Eyre, Karen L Oliver, Sharon Bain, Samuel F Berkovic, John C Mulley
Journal	Epilepsia (Epilepsia) Vol. 51 Issue 9 Pg. 1865-9 (Sep 2010) ISSN: 1528-1167 [Electronic] United States
PMID	20384724 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
Chemical References	KCNQ2 Potassium Channel KCNQ3 Potassium Channel NAV1.2 Voltage-Gated Sodium Channel NAV1.3 Voltage-Gated Sodium Channel Nerve Tissue Proteins SCN2A protein, human SCN3A protein, human Sodium Channels
Topics	Chromosomes, Human, Pair 2 (genetics) Epilepsy (genetics) Epilepsy, Benign Neonatal (genetics) Family Female Gene Duplication Humans Infant Intellectual Disability (genetics) KCNQ2 Potassium Channel (genetics, metabolism) KCNQ3 Potassium Channel (genetics, metabolism) Male Mutation (genetics) Mutation, Missense (genetics) NAV1.2 Voltage-Gated Sodium Channel NAV1.3 Voltage-Gated Sodium Channel Nerve Tissue Proteins Pedigree Sodium Channels (genetics, metabolism) Syndrome

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