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dc.contributor.authorLomax, L.en
dc.contributor.authorBayly, M.en
dc.contributor.authorHjalgrim, H.en
dc.contributor.authorMoller, R.en
dc.contributor.authorVlaar, A.en
dc.contributor.authorAaberg, K.en
dc.contributor.authorMarquardt, I.en
dc.contributor.authorGandolfo, L.en
dc.contributor.authorWillemsen, M.en
dc.contributor.authorKamsteeg, E.en
dc.contributor.authorO'Sullivan, J.en
dc.contributor.authorKorenke, G.en
dc.contributor.authorBloem, B.en
dc.contributor.authorde Coo, I.en
dc.contributor.authorVerhagen, J.en
dc.contributor.authorSaid, I.en
dc.contributor.authorPrescott, T.en
dc.contributor.authorStray-Pedersen, A.en
dc.contributor.authorRasmussen, M.en
dc.contributor.authorVears, D.en
dc.contributor.authoret al.en
dc.identifier.citationBrain, 2013; 136(4):1146-1154en
dc.description.abstractWe previously identified a homozygous mutation in the Golgi SNAP receptor complex 2 gene (GOSR2) in six patients with progressive myoclonus epilepsy. To define the syndrome better we analysed the clinical and electrophysiological phenotype in 12 patients with GOSR2 mutations, including six new unrelated subjects. Clinical presentation was remarkably similar with early onset ataxia (average 2 years of age), followed by myoclonic seizures at the average age of 6.5 years. Patients developed multiple seizure types, including generalized tonic clonic seizures, absence seizures and drop attacks. All patients developed scoliosis by adolescence, making this an important diagnostic clue. Additional skeletal deformities were present, including pes cavus in four patients and syndactyly in two patients. All patients had elevated serum creatine kinase levels (median 734 IU) in the context of normal muscle biopsies. Electroencephalography revealed pronounced generalized spike and wave discharges with a posterior predominance and photosensitivity in all patients, with focal EEG features seen in seven patients. The disease course showed a relentless decline; patients uniformly became wheelchair bound (mean age 13 years) and four had died during their third or early fourth decade. All 12 cases had the same variant (c.430G>T, G144W) and haplotype analyses confirmed a founder effect. The cases all came from countries bounding the North Sea, extending to the coastal region of Northern Norway. 'North Sea' progressive myoclonus epilepsy has a homogeneous clinical presentation and relentless disease course allowing ready identification from the other progressive myoclonus epilepsies.en
dc.description.statementofresponsibilityLysa Boissé Lomax...Jozef Gecz... et al.en
dc.publisherOxford Univ Pressen
dc.rights© The Author (2013). Published by Oxford University Press on behalf of the Guarantors of Brain. All rights reserved.en
dc.subjectprogressive myoclonus epilepsy; GOSR2; scoliosis; creatine kinase; electroencephalographyen
dc.title'North Sea' progressive myoclonus epilepsy: phenotype of subjects with GOSR2 mutationen
dc.typeJournal articleen
pubs.library.collectionObstetrics and Gynaecology publicationsen
dc.identifier.orcidCorbett, M. [0000-0001-9298-3072]en
dc.identifier.orcidGecz, J. [0000-0002-7884-6861]en
Appears in Collections:Obstetrics and Gynaecology publications

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