Permanent URL to this publication: http://dx.doi.org/10.5167/uzh-1018
Lee, R Y; Lobel, L; Hengartner, M; Horvitz, H R; Avery, L (1997). Mutations in the alpha1 subunit of an L-type voltage-activated Ca2+ channel cause myotonia in Caenorhabditis elegans. The EMBO Journal, 16(20):6066-6076.
The control of excitable cell action potentials is central to animal behavior. We show that the egl-19 gene plays a pivotal role in regulating muscle excitation and contraction in the nematode Caenorhabditis elegans and encodes the alphal subunit of a homologue of vertebrate L-type voltage-activated Ca2+ channels. Semi-dominant, gain-of-function mutations in egl-19 cause myotonia: mutant muscle action potentials are prolonged and the relaxation delayed. Partial loss-of-function mutations cause slow muscle depolarization and feeble contraction. The most severe loss-of-function mutants lack muscle contraction and die as embryos. We localized two myotonic mutations in the sixth membrane-spanning domain of the first repeat (IS6) region, which has been shown to be responsible for voltage-dependent inactivation. A third myotonic mutation implicates IIIS4, a region involved in sensing plasma-membrane voltage change, in the inactivation process.
|Item Type:||Journal Article, refereed|
|Communities & Collections:||07 Faculty of Science > Institute of Molecular Life Sciences|
|DDC:||570 Life sciences; biology|
|Date:||15 October 1997|
|Deposited On:||11 Feb 2008 13:20|
|Last Modified:||23 Nov 2012 14:54|
|Publisher:||European Molecular Biology Organization ; Nature Publishing Group|
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