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Paroxysmal kinesigenic dyskinesia and myotonia congenita in the same family: coexistence of a PRRT2 mutation and two CLCN1 mutations

Neuroscience Bulletin volume 30, pages 1010–1016 (2014)Cite this article

Abstract

Paroxysmal kinesigenic dyskinesia (PKD) and myotonia congenita (MC) are independent disorders that share some clinical features. We aimed to investigate the sequences of PRRT2 and CLCN1 in a proband diagnosed with PKD and suspected MC. Clinical evaluation and auxiliary examinations were performed. Direct sequencing of the entire coding regions of the PRRT2 and CLCN1 genes was conducted. Haplotype analysis confirmed the relationships among the family members. The proband suffered choreoathetosis attacks triggered by sudden movements, and lower-limb weakness and stiffness that worsened in cold weather. Carbamazepine monotherapy completely controlled his choreoathetosis and significantly relieved his limb weakness and stiffness. His father, when young, had similar limb stiffness, while his mother and brother were asymptomatic. Genetic analysis revealed that the proband and his father harbored a PRRT2 c.649dupC mutation, and CLCN1 c.1723C>T and c.2492A>G mutations. His brother carried only the two CLCN1 mutations. None of these mutations were identified in his mother and 150 unrelated controls. This is the first report showing the coexistence of PRRT2 and CLCN1 mutations. Our results also indicate that both the PRRT2 and CLCN1 genes need to be screened if we fail to identify PRRT2 mutations in PKD patients or CLCN1 mutations in MC patients.

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Authors and Affiliations

  1. Department of Neurology and Institute of Neurology, Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, 310009, China

    Hong-Fu Li & Zhi-Ying Wu

  2. Department of Neurology and Institute of Neurology, Huashan Hospital, Shanghai Medical College, Fudan University, Shanghai, 200040, China

    Hong-Fu Li & Zhi-Ying Wu

  3. Department of Neurology and Institute of Neurology, First Affiliated Hospital, Fujian Medical University, Fuzhou, 350005, China

    Wan-Jin Chen & Wang Ni

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  1. Hong-Fu Li
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  2. Wan-Jin Chen
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  3. Wang Ni
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  4. Zhi-Ying Wu
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Correspondence to Zhi-Ying Wu.

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These authors contributed equally to this work.

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Li, HF., Chen, WJ., Ni, W. et al. Paroxysmal kinesigenic dyskinesia and myotonia congenita in the same family: coexistence of a PRRT2 mutation and two CLCN1 mutations. Neurosci. Bull. 30, 1010–1016 (2014). https://doi.org/10.1007/s12264-014-1467-7

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  • DOI: https://doi.org/10.1007/s12264-014-1467-7

Keywords

  • paroxysmal kinesigenic dyskinesia
  • myotonia congenita
  • PRRT2
  • CLCN1