BACKGROUND: SCN1A is the most clinically relevant epilepsy gene, most mutations causing Dravet syndrome (also known as severe myoclonic epilepsy of infancy or SMEI). We evaluated clinical differences, if any, between young patients with and without a SCN1A mutations and a definite clinical diagnosis of Dravet syndrome. METHODS: Twenty-five patients with a diagnosis of Dravet Syndrome (7 males, 18 females; mean age at inclusion: 10.3; median: 9±7; range: 18 months-30 years) were retrospectively studied. A clinical and genetic study focusing on SCN1A was performed, using DHPLC, gene sequencing and MLPA to detect genomic deletions/duplications. A formal cognitive and behavioral assessment was available for all patients. RESULTS: Analysis revealed SCN1A mutations comprising missense, truncating mutations and genomic deletions/duplications in eighteen patients and no mutation in seven. The phenotype of mutation positive patients was characterized by a higher number of seizures/month in the first year of life, an earlier seizure onset and a higher frequency of episodes of status epilepticus. The cognitive and behavioral profile was slightly worst in mutation positive patients. CONCLUSIONS: These findings confirm that SCN1A gene mutations are strongly associated to a more severe phenotype in patients with Dravet syndrome. Copyright Â
BACKGROUND:SCN1A is the most clinically relevant epilepsy gene, most mutations causing Dravet syndrome (also known as severe myoclonic epilepsy of infancy or SMEI). We evaluated clinical differences, if any, between young patients with and without a SCN1A mutations and a definite clinical diagnosis of Dravet syndrome. METHODS: Twenty-five patients with a diagnosis of Dravet Syndrome (7 males, 18 females; mean age at inclusion: 10.3; median: 9±7; range: 18 months-30 years) were retrospectively studied. A clinical and genetic study focusing on SCN1A was performed, using DHPLC, gene sequencing and MLPA to detect genomic deletions/duplications. A formal cognitive and behavioral assessment was available for all patients. RESULTS: Analysis revealed SCN1A mutations comprising missense, truncating mutations and genomic deletions/duplications in eighteen patients and no mutation in seven. The phenotype of mutation positive patients was characterized by a higher number of seizures/month in the first year of life, an earlier seizure onset and a higher frequency of episodes of status epilepticus. The cognitive and behavioral profile was slightly worst in mutation positive patients. CONCLUSIONS: These findings confirm that SCN1A gene mutations are strongly associated to a more severe phenotype in patients with Dravet syndrome. Copyright Â
Authors: Alina I Esterhuizen; Heather C Mefford; Rajkumar S Ramesar; Shuyu Wang; Gemma L Carvill; Jo M Wilmshurst Journal: Seizure Date: 2018-09-14 Impact factor: 3.184
Authors: Rikke S Møller; Line H G Larsen; Katrine M Johannesen; Inga Talvik; Tiina Talvik; Ulvi Vaher; Maria J Miranda; Muhammad Farooq; Jens E K Nielsen; Lene Lavard Svendsen; Ditte B Kjelgaard; Karen M Linnet; Qin Hao; Peter Uldall; Mimoza Frangu; Niels Tommerup; Shahid M Baig; Uzma Abdullah; Alfred P Born; Pia Gellert; Marina Nikanorova; Kern Olofsson; Birgit Jepsen; Dragan Marjanovic; Lana I K Al-Zehhawi; Sofia J Peñalva; Bente Krag-Olsen; Klaus Brusgaard; Helle Hjalgrim; Guido Rubboli; Deb K Pal; Hans A Dahl Journal: Mol Syndromol Date: 2016-08-20
Authors: J J T van Harssel; S Weckhuysen; M J A van Kempen; K Hardies; N E Verbeek; C G F de Kovel; W B Gunning; E van Daalen; M V de Jonge; A C Jansen; R J Vermeulen; W F M Arts; H Verhelst; A Fogarasi; J F de Rijk-van Andel; A Kelemen; D Lindhout; P De Jonghe; B P C Koeleman; A Suls; E H Brilstra Journal: Neurogenetics Date: 2013-01-20 Impact factor: 2.660
Authors: Christine S Cheah; Ruth E Westenbroek; William H Roden; Franck Kalume; John C Oakley; Laura A Jansen; William A Catterall Journal: Channels (Austin) Date: 2013-08-21 Impact factor: 2.581