Murat Gultekin1, Muhammet Ensar Dogan2, Gulsah Simsir3, Ayse Nazlı Basak3. 1. Department of Neurology, Faculty of Medicine, Erciyes University, 38039, Kayseri, Turkey. gultekin@erciyes.edu.tr. 2. Department of Medical Genetics, Faculty of Medicine, Erciyes University, Kayseri, Turkey. 3. Department of Molecular Biology and Genetics, School of Medicine, Koç University, Istanbul, Turkey.
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.
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.
Authors: Yvonne G Weber; Alexander Storch; Thomas V Wuttke; Knut Brockmann; Judith Kempfle; Snezana Maljevic; Lucia Margari; Christoph Kamm; Susanne A Schneider; Stephan M Huber; Arnulf Pekrun; Robert Roebling; Guiscard Seebohm; Saisudha Koka; Camelia Lang; Eduard Kraft; Dragica Blazevic; Alberto Salvo-Vargas; Michael Fauler; Felix M Mottaghy; Alexander Münchau; Mark J Edwards; Anna Presicci; Francesco Margari; Thomas Gasser; Florian Lang; Kailash P Bhatia; Frank Lehmann-Horn; Holger Lerche Journal: J Clin Invest Date: 2008-06 Impact factor: 14.808