De novo loss- or gain-of-function mutations in KCNA2 cause epileptic encephalopathy.

Syrbe, Steffen; Hedrich, Ulrike B S; Riesch, Erik; Djémié, Tania; Müller, Stephan; Møller, Rikke S; Maher, Bridget; Hernandez-Hernandez, Laura; Synofzik, Matthis; Caglayan, Hande S; Arslan, Mutluay; Serratosa, José M; Nothnagel, Michael; May, Patrick; Krause, Roland; Löffler, Heidrun; Detert, Katja; Dorn, Thomas; Vogt, Heinrich; Krämer, Günter; ... (2015). De novo loss- or gain-of-function mutations in KCNA2 cause epileptic encephalopathy. Nature genetics, 47(4), pp. 393-399. Nature America 10.1038/ng.3239

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Epileptic encephalopathies are a phenotypically and genetically heterogeneous group of severe epilepsies accompanied by intellectual disability and other neurodevelopmental features. Using next-generation sequencing, we identified four different de novo mutations in KCNA2, encoding the potassium channel KV1.2, in six isolated patients with epileptic encephalopathy (one mutation recurred three times independently). Four individuals presented with febrile and multiple afebrile, often focal seizure types, multifocal epileptiform discharges strongly activated by sleep, mild to moderate intellectual disability, delayed speech development and sometimes ataxia. Functional studies of the two mutations associated with this phenotype showed almost complete loss of function with a dominant-negative effect. Two further individuals presented with a different and more severe epileptic encephalopathy phenotype. They carried mutations inducing a drastic gain-of-function effect leading to permanently open channels. These results establish KCNA2 as a new gene involved in human neurodevelopmental disorders through two different mechanisms, predicting either hyperexcitability or electrical silencing of KV1.2-expressing neurons.

Item Type:

Journal Article (Original Article)

Division/Institute:

04 Faculty of Medicine > Department of Gynaecology, Paediatrics and Endocrinology (DFKE) > Clinic of Paediatric Medicine
04 Faculty of Medicine > Department of Gynaecology, Paediatrics and Endocrinology (DFKE) > Clinic of Paediatric Medicine > Neuropaediatrics
04 Faculty of Medicine > Pre-clinic Human Medicine > BioMedical Research (DBMR) > Unit Childrens Hospital > Forschungsgruppe Endokrinologie / Diabetologie / Metabolik (Pädiatrie)
04 Faculty of Medicine > Pre-clinic Human Medicine > BioMedical Research (DBMR) > Unit Childrens Hospital > Forschungsgruppe Humangenetik

UniBE Contributor:

Mullis, Primus-Eugen; Steinlin, Maja; Gallati, Sabina and Lemke, Johannes

Subjects:

600 Technology > 610 Medicine & health

ISSN:

1061-4036

Publisher:

Nature America

Language:

English

Submitter:

André Schaller

Date Deposited:

24 Mar 2015 09:18

Last Modified:

29 Oct 2015 09:56

Publisher DOI:

10.1038/ng.3239

PubMed ID:

25751627

BORIS DOI:

10.7892/boris.65361

URI:

https://boris.unibe.ch/id/eprint/65361

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