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  • Title: Novel CLCN1 mutation in carbamazepine-responsive myotonia congenita.
    Author: Lyons MJ, Duron R, Molinero I, Sangiuolo F, Holden KR.
    Journal: Pediatr Neurol; 2010 May; 42(5):365-8. PubMed ID: 20399394.
    Abstract:
    Myotonia congenita is a nondystrophic muscle disorder characterized by muscle stiffness and muscle hypertrophy. The disorder can be inherited in an autosomal-dominant (Thomsen disease) or autosomal-recessive (Becker disease) manner. Both forms of myotonia congenita are attributable to mutations in the CLCN1 gene. Treatment with a variety of medications has led to long-term improvement in the clinical course of affected individuals. We describe a Honduran boy with myotonia congenita and a novel p.L287I mutation in the CLCN1 gene. The patient's unaffected father carries the same mutation, most likely reflecting autosomal-recessive myotonia congenita, with an inability to find a second mutation. The patient received carbamazepine treatment for 1 year, resulting in decreased muscle stiffness, increased strength, and improved quality of life in school and with peers.
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