Abstract
The dystrophin-glycoprotein complex (DGC) is critical for muscle membrane stability. The sarcoglycans are transmembrane proteins within the DGC, and the function of the sarcoglycans is unknown. Mutations in sarcoglycan genes cause autosomal recessive muscular dystrophy. We have identified a new sarcoglycan gene with high homology to α-sarcoglycan highlighting the redundancy of the DGC. This gene, named ϵ-sarcoglycan, has an identical intron-exon structure to α-sarcoglycan, and is more broadly expressed. The characterization of ϵ-sarcoglycan should make it possible to determine if it, like the other sarcoglycan genes, is mutated in muscular dystrophy.
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