Painful cramps and giant myotonic discharges in a family with the Nav1.4-G1306A mutation.

Abstract:

INTRODUCTION:Two previously reported Norwegian patients with painful muscle cramps and giant myotonic discharges were genotyped and compared with those of members of 21 families harboring the same mutation. METHODS:Using primers specific for SCN4A and CLCN1, the DNA of the Norwegian family members was amplified and bidirectionally sequenced. Clinical and neurophysiological features of other families harboring the same mutation were studied. RESULTS:A G1306A mutation in the Nav1.4 voltage-gated sodium channel of skeletal muscle was identified. This mutation is known to cause myotonia fluctuans. No giant myotonic discharges or painful muscle cramps were found in the other G1306A families. CONCLUSIONS:Ephaptic transmission between neighboring muscle fibers may not only cause the unusual size of the myotonic discharges in this family, but also a more severe type of potassium-aggravated myotonia than myotonia fluctuans.

journal_name

Muscle Nerve

journal_title

Muscle & nerve

authors

Torbergsen T,Jurkat-Rott K,Stålberg EV,Løseth S,Hødneø A,Lehmann-Horn F

doi

10.1002/mus.24672

subject

Has Abstract

pub_date

2015-10-01 00:00:00

pages

680-3

issue

4

eissn

0148-639X

issn

1097-4598

journal_volume

52

pub_type

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