Novel chloride channel mutations leading to mild myotonia among Chinese

Burgunder, Jean-Marc; Huifang, Shang; Beguin, Pascal; Baur, Roland; Eng, Chew Soh; Seet, Raymond C S; Lim, Erle C H; Ong, Benjamin K C; Hunziker, Walter; Sigel, Erwin (2008). Novel chloride channel mutations leading to mild myotonia among Chinese. Neuromuscular disorders, 18(8), pp. 633-40. Amsterdam: Elsevier 10.1016/j.nmd.2008.05.007

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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.

Item Type:	Journal Article (Original Article)
Division/Institute:	04 Faculty of Medicine > Department of Head Organs and Neurology (DKNS) > Clinic of Neurology 04 Faculty of Medicine > Pre-clinic Human Medicine > Institute of Biochemistry and Molecular Medicine
UniBE Contributor:	Burgunder, Jean-Marc, Sigel, Erwin
ISSN:	0960-8966
ISBN:	18579381
Publisher:	Elsevier
Language:	English
Submitter:	Factscience Import
Date Deposited:	04 Oct 2013 15:03
Last Modified:	05 Dec 2022 14:19
Publisher DOI:	10.1016/j.nmd.2008.05.007
PubMed ID:	18579381
Web of Science ID:	000259594000006
URI:	https://boris.unibe.ch/id/eprint/27331 (FactScience: 106054)