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Original article| Volume 26, ISSUE 7, P469-479, October 2004

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Fukutin expression in mouse non-muscle somatic organs: its relationship to the hypoglycosylation of α-dystroglycan in Fukuyama-type congenital muscular dystrophy

      Abstract

      Resent studies suggest that hypoglycosylation of α-dystroglycan (α-DG) may play an essential role in the pathogenesis of Fukuyama-type congenital muscular dystrophy (FCMD), which is caused by defects in the fukutin gene and characterized by dystrophic changes in the skeletal muscles and dysplastic lesions in the central nervous system. α-DG is expressed in many organs in addition to muscle and brain, although these organs are not affected in FCMD. To elucidate whether or not fukutin protein is involved in the glycosylation of α-DG in non-muscle somatic organs, we examined the distribution pattern of fukutin in developing and adult mouse tissues. The fukutin antisera labeled the acinar cells of the pancreas, the renal glomerular and tubular cells, and the epithelium of the bronchi, salivary gland, alimentary tract and skin in both fetal and adult mice. This distribution pattern was also confirmed by in situ hybridization. Antisera against α-DG and β-DG labeled the same cellular populations in each organ, especially along the cell surface membrane. We also examined the glycosylation status of α-DG in autopsied FCMD cases (n=5) and found evidence of hypoglycosylation in the kidney, lung, skin and intestine. These results suggest that fukutin protein is involved in the glycosylation process of α-DG in non-muscle somatic organs both during development and in the adult. It is unclear why muscle and brain symptoms predominate in FCMD, however re-evaluation of the functions of α-DG and fukutin protein in non-muscle somatic organs may provide valuable insight.

      Keywords

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