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Disorganization of dystrophin costameric lattice in Becker muscular dystrophy

โœ Scribed by C. Minetti; G. Cordone; F. Beltrame; M. Bado; E. Bonilla

Publisher
John Wiley and Sons
Year
1998
Tongue
English
Weight
264 KB
Volume
21
Category
Article
ISSN
0148-639X

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โœฆ Synopsis

We studied by high-resolution immunofluorescence (HRI) and by confocal laser scanning optical microscopy (CLSOM) the costameric organization of dystrophin and vinculin at the surface membrane of muscle fibers from 4 young boys with Becker muscular dystrophy (BMD). By HRI, the surface membrane of normal fibers showed regular parallel bands encircling the fiber at the level of I and M band. In BMD fibers, the dystrophin bands were stretched apart, interrupted, or did not show the intermediate band encircling the M band. By CLSOM, computer reconstruction of muscle surface membrane showed disorganization of the costameric dystrophin lattice at the membrane level in BMD muscle, in contrast with the preservation of the costameric lattice organization of vinculin.

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## Communicated by Ulf Landegren Duchenne and Becker muscular dystrophy (DMD and BMD) are caused by mutations in the dystrophin gene. Large rearrangements in the gene are found in about two-thirds of DMD patients, with B60% carrying deletions and 5-10% carrying duplications. Most of the remaining