Molecular and genetic characterization of sarcospan:: insights into sarcoglycan-sarcospan interactions

被引:73
作者
Crosbie, RH
Lim, LE
Moore, SA
Hirano, M
Hays, AP
Maybaum, SW
Collin, H
Dovico, SA
Stolle, CA
Fardeau, M
Tomé, FMS
Campbell, KP
机构
[1] Univ Iowa, Coll Med, Howard Hughes Med Inst, Dept Physiol & Biophys,Dept Neurol, Iowa City, IA 52242 USA
[2] Univ Iowa, Coll Med, Dept Pathol, Iowa City, IA 52242 USA
[3] Columbia Presbyterian Med Ctr, Dept Neurol, New York, NY 10032 USA
[4] Columbia Presbyterian Med Ctr, Dept Neuropathol, New York, NY 10032 USA
[5] Columbia Presbyterian Med Ctr, Dept Cardiol, New York, NY 10032 USA
[6] Hop La Pitie Salpetriere, Inst Myol, INSERM, U523, Paris, France
[7] Univ Penn, Sch Med, Genet Diagnost Lab, Philadelphia, PA 19104 USA
关键词
D O I
10.1093/hmg/9.13.2019
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Autosomal recessive limb girdle muscular dystrophies 2C-2F represent a family of diseases caused by primary mutations in the sarcoglycan genes. We show that sarcospan, a novel tetraspan-like protein, is also lost in patients with either a complete or partial loss of the sarcoglycans. In particular, sarcospan was absent in a gamma-sarcoglycanopathy patient with normal levels of alpha-, beta- and delta-sarcoglycan, Thus, it is likely that assembly of the complete, tetrameric sarcoglycan complex is a prerequisite for membrane targeting and localization of sarcospan, Based on our findings that sarcospan is integrally associated with the sarcoglycans, we screened >50 autosomal recessive muscular dystrophy cases for mutations in sarcospan, Although we identified three intragenic polymorphisms, we did not find any cases of muscular dystrophy associated with primary mutations in the sarcospan gene. Finally, we have identified an important case of limb girdle muscular dystrophy and cardiomyopathy with normal expression of sarcospan. This patient has a primary mutation in the gamma-sarcoglycan gene, which causes premature truncation of gamma-sarcoglycan without affecting assembly of the mutant gamma-sarcoglycan into a complex with alpha-, beta- and delta-sarcoglycan and sarcospan, This is the first demonstration that membrane expression of a mutant sarcoglycan-sarcospan complex is insufficient in preventing muscular dystrophy and cardiomyopathy and that the C-terminus of gamma-sarcoglycan is critical for the functioning of the entire sarcoglycan-sarcospan complex. These findings are important as they contribute to a greater understanding of the structural determinants required for proper sarcoglycan-sarcospan expression and function.
引用
收藏
页码:2019 / 2027
页数:9
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