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SCN4ASkeletal Muscle Sodium Channel Gene
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So, hypokalemic periodic paralysis was considered in differential diagnosis, which was confirmed by genetic testing (mutation in SCN4A, Arg669H).
4 channels are expressed principally in the skeletal muscle cells, but there are some demonstrations that the SCN4A asubunit gene is expressed in normal human heart too (3).
Paramyotonia congenita with an SCN4A mutation affecting cardiac repolarization.