Predominantly myalgic phenotype caused by the c.3466G>A p.A1156T mutation in SCN4A gene

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Predominantly myalgic phenotype caused by the c.3466G>A p.A1156T mutation in SCN4A gene

OBJECTIVE To characterize the clinical phenotype in patients with p.A1156T sodium channel mutation. METHODS Twenty-nine Finnish patients identified with the c.3466G>A p.A1156T mutation in the SCN4A gene were extensively examined. In a subsequent study, 63 patients with similar myalgic phenotype and with negative results in myotonic dystrophy type 2 genetic screening (DM2-neg group) and 93 pat...

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An atypical phenotype of hypokalemic periodic paralysis caused by a mutation in the sodium channel gene SCN4A

Familial hypokalemic periodic paralysis is an autosomal-dominant channelopathy characterized by episodic muscle weakness with hypokalemia. The respiratory and cardiac muscles typically remain unaffected, but we report an atypical case of a family with hypokalemic periodic paralysis in which the affected members presented with frequent respiratory insufficiency during severe attacks. Molecular a...

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Myasthenic syndrome caused by mutation of the SCN4A sodium channel.

In a myasthenic syndrome associated with fatigable generalized weakness and recurrent attacks of respiratory and bulbar paralysis since birth, nerve stimulation at physiologic rates rapidly decremented the compound muscle action potential. Intercostal muscle studies revealed no abnormality of the resting membrane potential, evoked quantal release, synaptic potentials, acetylcholine receptor cha...

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Familial hyperkalemic periodic paralysis caused by a de novo mutation in the sodium channel gene SCN4A

Familial hyperkalemic periodic paralysis (HYPP) is an autosomaldominant channelopathy characterized by transient and recurrent episodes of paralysis with concomitant hyperkalemia. Mutations in the skeletal muscle voltage-gated sodium channel gene SCN4A have been reported to be responsible for this disease. Here, we report the case of a 16-year-old girl with HYPP whose mutational analysis reveal...

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Hyperkalemic periodic paralysis and paramyotonia congenita caused by a de novo mutation in the SCN4A gene

Familial hyperkalemic periodic paralysis is an autosomal-dominant channelopathy characterized by reversible paralysis associated with episodic hyperkalemia. Mutations in the skeletal muscle voltage-gated sodium channel gene (SCN4A) have been reported to be responsible for this disorder. Paramyotonia congenita is also caused by mutations in the SCN4A gene. Here, we report the case of a 17-year-o...

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ژورنال

عنوان ژورنال: Neurology

سال: 2017

ISSN: 0028-3878,1526-632X

DOI: 10.1212/wnl.0000000000003846