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Title: Novel chloride channel mutations leading to mild myotonia among Chinese
Authors: Burgunder, J.-M. 
Eng, C.S.
Seet, R.C.S. 
Lim, E.C.H. 
Ong, B.K.C. 
Beguin, P.
Hunziker, W.
Baur, R.
Sigel, E.
Keywords: Chinese
Chloride channel
Myotonia congenita
Issue Date: 2008
Citation: Burgunder, J.-M., Eng, C.S., Seet, R.C.S., Lim, E.C.H., Ong, B.K.C., Beguin, P., Hunziker, W., Baur, R., Sigel, E. (2008). Novel chloride channel mutations leading to mild myotonia among Chinese. Neuromuscular Disorders 18 (8) : 633-640. ScholarBank@NUS Repository.
Abstract: We describe two Chinese families with a mild form of the myotonia congenita due to novel chloride channel (ClCN1) mutations. In one case, heterozygous I553F and H555N mutations were found. The patient shared the I553F mutation with his healthy father, and his mother had a history of mild myotonia when she was younger. In another family, autosomal dominant myotonia congenita was due to a L844F change. The physiological effects of the mutations were examined by using the two-electrode voltage-clamp technique after expression of the channels in Xenopus oocytes. All mutations drastically shifted the voltage required for half-maximal activation, more under conditions mimicking the homozygous situation, than under conditions mimicking the heterozygous situation. The larger effect was seen in the compound heterozygous situation combining the I553F and the H555N mutations. Our data suggest that myotonia congenita caused by CLCN1 mutations in Chinese have similar variable features to those found in the West. © 2008 Elsevier B.V. All rights reserved.
Source Title: Neuromuscular Disorders
ISSN: 09608966
DOI: 10.1016/j.nmd.2008.05.007
Appears in Collections:Staff Publications

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