Two central core disease (CCD) deletions in the C-terminal region of RYR1 alter muscle excitation-contraction (EC) coupling by distinct mechanisms

Lyfenko, Alla D. and Ducreux, Sylvie and Wang, Ying and Xu, Le and Zorzato, Francesco and Ferreiro, Ana and Meissner, Gerhard and Treves, Susan and Dirksen, Robert T.. (2007) Two central core disease (CCD) deletions in the C-terminal region of RYR1 alter muscle excitation-contraction (EC) coupling by distinct mechanisms. Human Mutation, 28 (1). pp. 61-68.

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Official URL: http://edoc.unibas.ch/dok/A6174313

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Central core disease (CCD) and malignant hyperthermia (MH) are skeletal muscle disorders that are linked to mutations in the gene that encodes the type 1 ryanodine receptor (RYR1). The RYR1 ion channel plays a central role in excitation-contraction (EC) coupling by releasing Ca(2+) from an internal store. Pathogenic CCD mutations in RYR1 result in changes in the magnitude of Ca(2+) release during EC coupling. CCD has recently been linked to two novel deletions (c.12640_12648delCGCCAGTTC [p.Arg4214_Phe4216del] and c.14779_14784delGTCATC [p.Val4927_Ile4928del]) in the C-terminal region of RYR1. To determine the phenotypic consequences of these mutations and extend our understanding of the pathogenic mechanisms that underlie CCD, we determined functional effects on Ca(2+) release channel activity of analogous deletions (p.Arg4215_Phe4217del and p.Val4926_Ile4927del) engineered into rabbit RYR1 following expression in RYR1-null (dyspedic) myotubes and HEK293 cells. In addition, we assessed effects of the p.Arg4214 Phe4216del mutation on RYR1 function in lymphoblastoid cells obtained from CCD patients heterozygous for the mutation. Here we report that both deletions significantly reduce Ca(2+) release following RYR1 activation, but by different mechanisms. While the p.Arg4214_Phe4216del deletion promotes Ca(2+) depletion from intracellular stores by exhibiting a classic "leaky channel" behavior, the p.Val4927_Ile4928del deletion reduces Ca(2+) release by disrupting Ca(2+) gating and eliminating Ca(2+) permeation through the open channel.
Faculties and Departments:03 Faculty of Medicine > Departement Biomedizin > Department of Biomedicine, University Hospital Basel > Perioperative Patient Safety (Girard/Treves)
UniBasel Contributors:Treves, Susan
Item Type:Article, refereed
Article Subtype:Research Article
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:31 May 2017 09:29
Deposited On:25 Oct 2013 08:33

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