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Paroxysmal motor disorders: expanding phenotypes lead to coalescing genotypes.


ABSTRACT: Paroxysmal movement disorders encompass varied motor phenomena. Less recognized features and wide phenotypic and genotypic heterogeneity are impediments to straightforward molecular diagnosis. We describe a family with episodic ataxia type 1, initially mis-characterized as paroxysmal dystonia to illustrate this diagnostic challenge. We summarize clinical features in affected individuals to highlight underappreciated aspects and provide comprehensive phenotypic description of the rare familial KCNA1 mutation. Delayed diagnosis in this family is emblematic of the broader challenge of diagnosing other paroxysmal motor disorders. We summarize genotypic and phenotypic overlap and provide a suggested diagnostic algorithm for approaching patients with these conditions.

SUBMITTER: Zima L 

PROVIDER: S-EPMC6093839 | biostudies-other | 2018 Aug

REPOSITORIES: biostudies-other

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Paroxysmal motor disorders: expanding phenotypes lead to coalescing genotypes.

Zima Laura L   Ceulemans Sophia S   Reiner Gail G   Galosi Serena S   Chen Dillon D   Sahagian Michelle M   Haas Richard H RH   Hyland Keith K   Friedman Jennifer J  

Annals of clinical and translational neurology 20180717 8


Paroxysmal movement disorders encompass varied motor phenomena. Less recognized features and wide phenotypic and genotypic heterogeneity are impediments to straightforward molecular diagnosis. We describe a family with episodic ataxia type 1, initially mis-characterized as paroxysmal dystonia to illustrate this diagnostic challenge. We summarize clinical features in affected individuals to highlight underappreciated aspects and provide comprehensive phenotypic description of the rare familial <i  ...[more]

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