Abstract
Introduction
Paroxysmal exercise–induced dyskinesia (PED) is characterized by repeated episodes of involuntary movement disorders that are typically caused by prolonged walking or running and mostly caused by SLC2A1 gene mutations. Phenotypes vary from focal dystonia, ataxia, tremor, and complex non-kinesigenic movements to other movement disorders in patients with SLC2A1 mutation. Also, SLC2A1 mutations carriers may present with also other phenotypes such as epileptic seizure and migraine.
Case reports
We report five patients with various phenotypic spectrums of PED in a Turkish family. Whole exome sequencing revealed a likely pathogenic synonymous variant p.Ser324Ser (c.972G > A) in the SLC2A1 gene (ENST00000426263.3) and the variant segregated in all affected family members. Also, other than PED, the phenotypical spectrum of affected individuals in this family includes epilepsy, mental retardation, and weakness.
Conclusions
We concluded that family members with the same SLC2A1 gene mutation may show very heterogenous phenotypes. Clinicians should be aware of wide variety of symptoms of the patients with PED. We also emphasized that even if a mutation in the coding sequence does not make an amino acid change, it may cause the disease.
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We sincerely thank the patients for their cooperation in the testing of genetic samples and their consent to this publication.
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This paper was presented as e-poster at the congress of European Academy of Neurology in 2019
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Gultekin, M., Dogan, M.E., Simsir, G. et al. Varied phenotypic spectrum presenting of paroxysmal exercise–induced dyskinesia: a Turkish family with SLC2A1 mutation. Neurol Sci 42, 4751–4754 (2021). https://doi.org/10.1007/s10072-021-05466-x
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DOI: https://doi.org/10.1007/s10072-021-05466-x