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The spectrum of intermediate SCN 8A ‐related epilepsy

journal contribution
posted on 2023-07-26, 15:04 authored by Katrine M. Johannesen, Elena Gardella, Alejandra C. Encinas, Anna‐Elina Lehesjoki, Tarja Linnankivi, Michael B. Petersen, Ida C. B. Lund, Susanne Blichfeldt, Maria J. Miranda, Deb K. Pal, Karine Lascelles, Peter Procopis, Alessandro Orsini, Alice Bonuccelli, Thea Giacomini, Ingo Helbig, Christina D. Fenger, Sanjay M. Sisodiya, Laura Hernandez‐Hernandez, S. Krithika, Melissa Rumple, Silvia Masnada, Marialuisa Valente, Cristina Cereda, Lucio Giordano, Patrizia Accorsi, Sarah E. Bürki, Margherita Mancardi, Christian Korff, Renzo Guerrini, Sarah Spiczak, Dorota Hoffman‐Zacharska, Tomasz Mazurczak, Antonietta Coppola, Salvatore Buono, Marilena Vecchi, Michael F. Hammer, Costanza Varesio, Pierangelo Veggiotti, Dennis Lal, Tobias Brünger, Federico Zara, Pasquale Striano, Guido Rubboli, Rikke S. Møller
Objective: Pathogenic variants in SCN 8A have been associated with a wide spectrum of epilepsy phenotypes, ranging from benign familial infantile seizures (BFIS ) to epileptic encephalopathies with variable severity. Furthermore, a few patients with intellectual disability (ID ) or movement disorders without epilepsy have been reported. The vast majority of the published SCN 8A patients suffer from severe developmental and epileptic encephalopathy (DEE ). In this study, we aimed to provide further insight on the spectrum of milder SCN 8A‐related epilepsies. Methods: A cohort of 1095 patients were screened using a next generation sequencing panel. Further patients were ascertained from a network of epilepsy genetics clinics. Patients with severe DEE and BFIS were excluded from the study. Results: We found 36 probands who presented with an SCN 8A‐related epilepsy and normal intellect (33%) or mild (61%) to moderate ID (6%). All patients presented with epilepsy between age 1.5 months and 7 years (mean = 13.6 months), and 58% of these became seizure‐free, two‐thirds on monotherapy. Neurological disturbances included ataxia (28%) and hypotonia (19%) as the most prominent features. Interictal electroencephalogram was normal in 41%. Several recurrent variants were observed, including Ile763Val, Val891Met, Gly1475Arg, Gly1483Lys, Phe1588Leu, Arg1617Gln, Ala1650Val/Thr, Arg1872Gln, and Asn1877Ser. Significance: With this study, we explore the electroclinical features of an intermediate SCN 8A‐related epilepsy with mild cognitive impairment, which is for the majority a treatable epilepsy.

History

Refereed

  • Yes

Volume

60

Issue number

5

Page range

830-844

Publication title

Epilepsia

ISSN

1528-1167

Publisher

Wiley

Language

  • other

Legacy posted date

2020-07-30

Legacy Faculty/School/Department

Faculty of Science & Engineering

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