Abstract:
BACKGROUND:Limb girdle muscular dystrophy (LGMD) type 2A is caused by mutation in the gene encoding for calpain-3 resulting in total or partial loss of protein. Diagnosis of LGMD2A, the most prevalent form of LGMD, is established by analyzing calpain-3 protein deficiency or CAPN3 gene mutation. Since there is no data from India regarding the incidence of LGMD2A, this study was undertaken. AIMS:To study the frequency of LGMD2A in Indian population on the basis of protein analysis by immunoblotting and to correlate pathological and clinical features with protein analysis. SETTINGS AND DESIGN:One hundred and seventy-one muscle biopsies of clinically suspected LGMD, unclassified muscular dystrophy or myopathy were analyzed in a tertiary national referral centre for neurosciences. Materials and Methods : Histopathological, immunohistochemical and enzyme histochemical analysis of muscle biopsies was performed followed by protein analysis for calpain-3 and dysferlin by immunoblotting. RESULTS:Immunoblot identified 75 patients (43.8%) with calpain-3 deficiency, of which 36 (45%) had complete loss and 39 (55%) had partial loss of calpain-3 protein. In patients with LGMD phenotype alone, the incidence of LGMD2A was 47%. The biopsies of these patients displayed variety of morphological changes ranging from dystrophic pattern with presence of active fibre necrosis, regeneration and lobulated fibres to end stage muscle disease. The mean age of presentation and disease onset was 24 and 18 years respectively. CONCLUSIONS:This series of 75 patients is probably the first confirmed cases of LGMD2A (calpainopathy) from India. Our study suggests that LGMD2A is the most frequent form of LGMD in India, similar to the Western data, thus, highlighting the importance of immunoblotting for an accurate diagnosis.
journal_name
Neurol Indiajournal_title
Neurology Indiaauthors
Pathak P,Sharma MC,Sarkar C,Jha P,Suri V,Mohd H,Singh S,Bhatia R,Gulati Sdoi
10.4103/0028-3886.68675subject
Has Abstractpub_date
2010-07-01 00:00:00pages
549-54issue
4eissn
0028-3886issn
1998-4022pii
ni_2010_58_4_549_68675journal_volume
58pub_type
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