کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8281342 | 1535147 | 2012 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
A novel mutation in SCN4A causes severe myotonia and school-age-onset paralytic episodes
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کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری
بیوشیمی، ژنتیک و زیست شناسی مولکولی
سالمندی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: A novel mutation in SCN4A causes severe myotonia and school-age-onset paralytic episodes A novel mutation in SCN4A causes severe myotonia and school-age-onset paralytic episodes](/preview/png/8281342.png)
چکیده انگلیسی
Mutations in the pore-forming subunit of the skeletal muscle sodium channel (SCN4A) are responsible for hyperkalemic periodic paralysis, paramyotonia congenita and sodium channel myotonia. These disorders are classified based on their cardinal symptoms, myotonia and/or paralysis. We report the case of a Japanese boy with a novel mutation of SCN4A, p.I693L, who exhibited severe episodic myotonia from infancy and later onset mild paralytic attack. He started to have apneic episodes with generalized hypertonia at age of 11Â months, then developed severe episodic myotonia since 2Â years of age. He presented characteristic generalized features which resembled Schwarz-Jampel syndrome. After 7Â years old, paralytic episodes occurred several times a year. The compound muscle action potential did not change during short and long exercise tests. Functional analysis of the mutant channel expressed in cultured cell revealed enhancement of the activation and disruption of the slow inactivation, which were consistent with myotonia and paralytic attack. The severe clinical features in his infancy may correspond to myotonia permanence, however, he subsequently experienced paralytic attacks. This case provides an example of the complexity and overlap of the clinical features of sodium channel myotonic disorders.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of the Neurological Sciences - Volume 315, Issues 1â2, 15 April 2012, Pages 15-19
Journal: Journal of the Neurological Sciences - Volume 315, Issues 1â2, 15 April 2012, Pages 15-19
نویسندگان
Harumi Yoshinaga, Shunichi Sakoda, Jean-Marc Good, Masanori P. Takahashi, Tomoya Kubota, Eri Arikawa-Hirasawa, Tomohiko Nakata, Kinji Ohno, Tetsuro Kitamura, Katsuhiro Kobayashi, Yoko Ohtsuka,