Abstract:
:In-frame exon deletions of the Duchenne muscular dystrophy (DMD) gene produce internally truncated proteins that typically lead to Becker muscular dystrophy (BMD), a milder allelic disorder of DMD. We hypothesized that differences in the structure of mutant dystrophin may be responsible for the clinical heterogeneity observed in Becker patients and we studied four prevalent in-frame exon deletions, i.e. Δ45-47, Δ45-48, Δ45-49 and Δ45-51. Molecular homology modelling revealed that the proteins corresponding to deletions Δ45-48 and Δ45-51 displayed a similar structure (hybrid repeat) than the wild-type dystrophin, whereas deletions Δ45-47 and Δ45-49 lead to proteins with an unrelated structure (fractional repeat). All four proteins in vitro expressed in a fragment encoding repeats 16-21 were folded in α-helices and remained highly stable. Refolding dynamics were slowed and molecular surface hydrophobicity were higher in fractional repeat containing Δ45-47 and Δ45-49 deletions compared with hybrid repeat containing Δ45-48 and Δ45-51 deletions. By retrospectively collecting data for a series of French BMD patients, we showed that the age of dilated cardiomyopathy (DCM) onset was delayed by 11 and 14 years in Δ45-48 and Δ45-49 compared with Δ45-47 patients, respectively. A clear trend toward earlier wheelchair dependency (minimum of 11 years) was also observed in Δ45-47 and Δ45-49 patients compared with Δ45-48 patients. Muscle dystrophin levels were moderately reduced in most patients without clear correlation with the deletion type. Disease progression in BMD patients appears to be dependent on the deletion itself and associated with a specific structure of dystrophin at the deletion site.
journal_name
Hum Mol Genetjournal_title
Human molecular geneticsauthors
Nicolas A,Raguénès-Nicol C,Ben Yaou R,Ameziane-Le Hir S,Chéron A,Vié V,Claustres M,Leturcq F,Delalande O,Hubert JF,Tuffery-Giraud S,Giudice E,Le Rumeur E,French Network of Clinical Reference Centres for Neuromuscular Diseases (doi
10.1093/hmg/ddu537subject
Has Abstractpub_date
2015-03-01 00:00:00pages
1267-79issue
5eissn
0964-6906issn
1460-2083pii
ddu537journal_volume
24pub_type
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