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Dysferlin associates with the developing T‐tubule system in rodent and human skeletal muscle
Author(s) -
Klinge Lars,
Harris John,
Sewry Caroline,
Charlton Richard,
Anderson Louise,
Laval Steve,
Chiu YenHui,
Hornsey Mark,
Straub Volker,
Barresi Rita,
Lochmüller Hanns,
Bushby Kate
Publication year - 2010
Publication title -
muscle and nerve
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.025
H-Index - 145
eISSN - 1097-4598
pISSN - 0148-639X
DOI - 10.1002/mus.21166
Subject(s) - dysferlin , sarcolemma , skeletal muscle , limb girdle muscular dystrophy , muscular dystrophy , microbiology and biotechnology , myopathy , biology , myocyte , anatomy , chemistry , mutation , biochemistry , genetics , gene
Mutations in the dysferlin gene cause limb‐girdle muscular dystrophy type 2B, Miyoshi myopathy, and distal anterior compartment myopathy. Dysferlin mainly localizes to the sarcolemma in mature skeletal muscle where it is implicated in membrane fusion and repair. In different forms of muscular dystrophy, a predominantly cytoplasmic localization of dysferlin can be observed in regenerating myofibers, but the subcellular compartment responsible for this labeling pattern is not yet known. We have previously demonstrated an association of dysferlin with the developing T‐tubule system in vitro. To investigate the role of dysferlin in adult skeletal muscle regeneration, we studied dysferlin localization at high resolution in a rat model of regeneration and found that the subcellular labeling of dysferlin colocalizes with the developing T‐tubule system. Furthermore, ultrastructural analysis of dysferlin‐deficient muscle revealed primary T‐tubule anomalies similar to those seen in caveolin‐3–deficient muscle. These findings indicate that dysferlin is necessary for correct T‐tubule formation, and dysferlin‐deficient skeletal muscle is characterized by abnormally configured T‐tubules. Muscle Nerve : 166–173, 2010