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Dzinovic, I. ; Škorvánek, M.* ; Necpál, J.* ; Boesch, S.* ; Švantnerová, J.* ; Wagner, M. ; Havránková, P.* ; Pavelekova, P.* ; Han, V.* ; Janzarik, W.G.* ; Berweck, S.* ; Diebold, I.* ; Kuster, A.* ; Jech, R.* ; Winkelmann, J. ; Zech, M.

Dystonia as a prominent presenting feature in developmental and epileptic encephalopathies: A case series.

Parkinsonism Relat. Disord. 90, 73-78 (2021)
DOI PMC
Open Access Green as soon as Postprint is submitted to ZB.
Introduction: Although there has been increasing recognition of the occurrence of non-epileptic involuntary movements in developmental and epileptic encephalopathies (DEEs), the spectrum of dystonic presentations associated with these conditions remains poorly described. We sought to expand the catalogue of dystonia-predominant phenotypes in monogenic DEEs, building on the recently introduced concept of an epilepsy-movement disorder spectrum. Methods: Cases were identified from a whole-exome-sequenced cohort of 45 pediatric index patients with complex dystonia (67% sequenced as parent-child trios). Review of molecular findings in DEE-associated genes was performed. For five individuals with identified DEE-causing variants, detailed information about presenting phenotypic features and the natural history of disease was obtained. Results: De-novo pathogenic and likely pathogenic missense variants in GABRA1, GABBR2, GNAO1, and FOXG1 gave rise to infantile-onset persistent and paroxysmal dystonic manifestations, beginning in the limb or truncal musculature and progressing gradually to a generalized state. Coexisting, less prominent movement-disorder symptoms were observed and included myoclonic, ballistic, and stereotypic abnormal movements as well as choreoathetosis. Dystonia dominated over epileptic neurodevelopmental comorbidities in all four subjects and represented the primary indication for molecular genetic analysis. We also report the unusual case of an adult female patient with dystonia, tremor, and mild learning disability who was found to harbor a pathogenic frameshift variant in MECP2. Conclusions: Dystonia can be a leading clinical manifestation in different DEEs. A monogenic basis of disease should be considered on the association of dystonia and developmental delay-epilepsy presentations, justifying a molecular screening for variants in DEE-associated genes.
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Publication type Article: Journal article
Document type Scientific Article
Corresponding Author
Keywords Dystonia ; Epilepsy ; Epilepsy-dyskinesia Spectrum ; Neurodevelopmental Disease; Mutations
ISSN (print) / ISBN 1353-8020
e-ISSN 1873-5126
Journal Parkinsonism & Related Disorders
Quellenangaben Volume: 90, Issue: , Pages: 73-78 Article Number: , Supplement: ,
Publisher Elsevier
Publishing Place The Boulevard, Langford Lane, Kidlington, Oxford Ox5 1gb, Oxon, England
Non-patent literature Publications
Reviewing status Peer reviewed
Institute(s) Institute of Neurogenomics (ING)
Grants Operational Programme Integrated Infrastructure - ERDF
European Reference Network for Rare Neurological Diseases
Technische Universitadt Munchen, Munich, Germany
Helmholtz Zentrum Munchen, Munich, Germany
Charles University, Prague, Czech Republic
Czech Ministry of Education
European Joint Programmeon Rare Diseases (EJP RD COFUND)
Slovak Grant and Development Agency
German Research Foundation