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October 01, 1996; 47 (4) ARTICLES

Mutations in the human skeletal muscle chloride channel gene (CLCN1) associated with dominant and recessive myotonia congenita

J. Zhang, A. L. George, R. C. Griggs, G. T. Fouad, J. Roberts, H. Kwiecinski, A. M. Connolly, L. J. Ptacek
First published October 1, 1996, DOI: https://doi.org/10.1212/WNL.47.4.993
J. Zhang
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A. L. George Jr.
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R. C. Griggs
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G. T. Fouad
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J. Roberts
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H. Kwiecinski
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A. M. Connolly
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L. J. Ptacek
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Citation
Mutations in the human skeletal muscle chloride channel gene (CLCN1) associated with dominant and recessive myotonia congenita
J. Zhang, A. L. George, R. C. Griggs, G. T. Fouad, J. Roberts, H. Kwiecinski, A. M. Connolly, L. J. Ptacek
Neurology Oct 1996, 47 (4) 993-998; DOI: 10.1212/WNL.47.4.993

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Abstract

Myotonia, defined as delayed relaxation of muscle after contraction, is seen in a group of genetic disorders that includes autosomal dominant myotonia congenita (Thomsen's disease) and autosomal recessive myotonia congenita (Becker's disease).Both disorders are characterized electrophysiologically by increased excitability of muscle fibers, reflected in clinical myotonia. These diseases are similar except that transient weakness is seen in patients with Becker's, but not Thomsen's disease. Becker's and Thomsen's diseases are caused by mutations in the skeletal muscle voltage-gated chloride channel gene (CLCN1). Genetic screening of a panel of 18 consecutive myotonia congenita (MC) probands for mutation in CLCN1 revealed that a novel Gln-68-Stop nonsense mutation predicts premature truncation of the chloride channel protein. Four previously reported mutations, Arg-894-stop, Arg-338-Gln, Gly-230-Glu, and del 1437-1450, were also noted in our sample set. The Arg-338-Gln and Gly-230-Glu mutations were found in patients with different phenotypes from those of previous reports. Further study of the Arg-338-Gln and Gly-230-Glu alleles may shed light on variable modes of transmission (dominant versus recessive) in different families. Physiologic study of these mutations may lead to better understanding of the pathophysiology of myotonia in these patients and of voltage-gated chloride channel structure/function relationships in skeletal muscles.

NEUROLOGY 1996;47: 993-998

  • Copyright 1996 by Advanstar Communications Inc.
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