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Myoclonus and Dystonia as Recurrent Presenting Features in Patients with the SCA21-Associated TMEM240 p.Pro170Leu Variant

U. Sorrentino, LM. Romito, B. Garavaglia, M. Fichera, I. Colangelo, H. Prokisch, J. Winkelmann, J. Necpal, R. Jech, M. Zech

. 2024 ; 14 (-) : 16. [pub] 20240410

Jazyk angličtina Země Anglie, Velká Británie

Typ dokumentu přehledy, kazuistiky

Perzistentní odkaz   https://www.medvik.cz/link/bmc24014336

BACKGROUND: Spinocerebellar ataxia 21 (SCA21) is a rare neurological disorder caused by heterozygous variants in TMEM240. A growing, yet still limited number of reports suggested that hyperkinetic movements should be considered a defining component of the disease. CASE SERIES: We describe two newly identified families harboring the recurrent pathogenic TMEM240 p.Pro170Leu variant. Both index patients and the mother of the first proband developed movement disorders, manifesting as myoclonic dystonia and action-induced dystonia without co-occurring ataxia in one case, and pancerebellar syndrome complicated by action-induced dystonia in the other. We reviewed the literature on TMEM240 variants linked to hyperkinetic disorders, comparing our cases to described phenotypes. DISCUSSION: Adding to prior preliminary observations, our series highlights the relevance of hyperkinetic movements as clinically meaningful features of SCA21. TMEM240 mutation should be included in the differential diagnosis of myoclonic dystonia and ataxia-dystonia syndromes.

Citace poskytuje Crossref.org

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