The sarcoglycan complex in the six autosomal recessive limb-girdle muscular dystrophies.

Abstract:

:To enhance our understanding of the autosomal recessive limb-girdle muscular dystrophy (LGMD), patients from six genetically distinct forms (LGMD2A to LGMD2F) were studied with antibodies directed against four sarcoglycan subunits (alpha-, beta-, gamma-, delta-SG), dystrophin, beta-dystroglycan (beta-DG) and merosin. All patients with LGMD2A and 2B had a mild clinical course while those with a primary sarcoglycan mutation (LGMD2C to 2F) had a range of clinical severity. Dystrophin and merosin immunofluorescence pattern was positive in patients with all six AR LGMDs. The majority of patients with a severe Duchenne-like phenotype presented total absence of the SG complex. However, some exceptions were found in 13q linked patients, indicating that the presence of a certain labelling for components of the SG may not be prognostic for a milder phenotype. The observation that the primary absence of alpha-SG results in the total absence of beta- and delta-SG but not of gamma-SG suggests that the alpha-, beta- and delta-subunits of sarcoglycan may be more closely associated. A secondary reduction in dystrophin amount was seen in patients with primary sarcoglycan mutations, which was most marked in patients with primary beta-, gamma- and delta-SG deficiencies. In contrast, beta-DG staining was retained in all patients, suggesting that the association between SG and DG subcomplexes is not so strong. Based on the above findings, we have refined the model for the interaction among the known glycoproteins of the sarcoglycan complex, within the DGC.

journal_name

Hum Mol Genet

journal_title

Human molecular genetics

authors

Vainzof M,Passos-Bueno MR,Canovas M,Moreira ES,Pavanello RC,Marie SK,Anderson LV,Bonnemann CG,McNally EM,Nigro V,Kunkel LM,Zatz M

doi

10.1093/hmg/5.12.1963

subject

Has Abstract

pub_date

1996-12-01 00:00:00

pages

1963-9

issue

12

eissn

0964-6906

issn

1460-2083

pii

6d0167

journal_volume

5

pub_type

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