Dysferlin protein analysis in limb-girdle muscular dystrophies
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Dysferlin is the protein product of the DYSF gene mapped at 2p31, which mutations cause limb-girdle muscular dystrophy type 2B (LGMD2B) and Miyoshi myopathy. To date, nine autosomal recessive forms (AR-LGMD) have been identified: four genes, which code for the sarcoglycan glycoproteins, are associated with both mild and severe forms, the sarcoglycanopathies (LGMD2C, 2D, 2E and 2F). The other five forms, usually causing a milder phenotype are LGMD2A (calpain 3), LGMD2B (dysferlin), LGMD2G (telethonin), LGMD2H (9q31-11), and LGMD2I (19q13.3).
We studied dysferlin expression in a total of 176 patients, from 166 LGMD families: 12 LGMD2B patients, 70 with other known forms of muscular dystrophies (LGMD2A, sarcoglycanopathies, LGMD2G), in an attempt to assess the effect of the primary gene-product deficiency on dysferlin. In addition, 94 still unclassified LGMD families were screened for dysferlin deficiency.
In eight LGMD2B patients from five families, no dysferlin was observed in muscle biopsies, both through immunofluorescence (IF) and Western blot methodologies, while in two families, a very faint band was detected. Both patterns, negative or very faint bands, were concordant in patients belonging to the same families, suggesting that dysferlin deficiency is specific to LGMD2B.
Myoferlin, the newly identified homologue of dysferlin was studied for the first time in LGMD2B patients. Since no difference was observed between patients mildly and severely affected, this protein do not seem to modify the phenotype in the present dysferlin-deficient patients.
Dystrophin, sarcoglycans, and telethonin were normal in all LGMD2B patients, while patients with sarcoglycanopathies (2C, 2D, and 2E), LGMD2A, LGMD2G, and DMD showed the presence of a normal dysferlin band by Western blot and a positive pattern on IF. These data suggest that there is no interaction between dysferlin and these proteins. However, calpain analysis showed a weaker band in four patients from two families with intra-familial concordance. Therefore, this secondary deficiency of calpain in LGMD2B families, may indicate an interaction between dysferlin and calpain in muscle.
Dysferlin was also present in cultured myotubes, in chorionic villus, and in the skin.
Dysferlin deficiency was found in 24 out of a total of 166 Brazilian AR-LGMD families screened for muscle proteins (∼14%), thus representing the second most frequent known LGMD form, after calpainopathy, in our population.
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- Dysferlin protein analysis in limb-girdle muscular dystrophies
Journal of Molecular Neuroscience
Volume 17, Issue 1 , pp 71-80
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- 1. Centro de Estudos do Genoma Humano, Dept. Biology, IB, Universidade de São Paulo, R. do Matão, 106, São Paulo, Brazil
- 2. Neurobiology Department, University of Newcastle upon Tyne, Newcastle, UK
- 3. Department of Medicine and Human Genetics, University of Chicago, Chicago, IL
- 4. International Centre for Genetic Engineering and Biotechnology, Padriciano 99, I-34012, Trieste, Italy
- 5. CRIBI biotechnology Center, Universitá degli Studi de Padova, via Ugo Bassi 58b, I-35121, Padova, Italy