KMID : 1130320140570030149
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Korean Journal of Pediatrics 2014 Volume.57 No. 3 p.149 ~ p.152
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Congenital muscular dystrophy type 1A with residual merosin expression
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Kim Hyo-Jeong
Choi Young-Chul Park Hyung-Jun Lee Young-Mock Kim Heung-Dong Lee Joon-Soo Kang Hoon-Chul
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Abstract
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Congenital muscular dystrophy type 1A (MDC1A) is an autosomal recessive disorder characterized by hypotonia, elevated serum creatine kinase level, delayed motor milestones, white matter changes observed by brain magnetic resonance imaging, and normal intelligence. A mutation in the laminin ¥á2 (LAMA2 ) gene, located at 6q22-23, is a genetic cause of MDC1A. Patients have merosin (laminin ¥á2)- deficient skeletal muscles. However, the degree of merosin expression ranges from total absence to partial reduction. Patients with residual merosin expression have more variable and milder phenotypes than those with absolute merosin deficiency. We observed a Korean girl with MDC1A with residual merosin expression. Clinical presentation of this patient was typical except for late onset of the disease and external capsule involvement. Immunohistochemical staining of muscle fibers including merosin, is important to evaluate patients with hypotonia, delayed motor development, and abnormal white matter changes.
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KEYWORD
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Merosin-deficient congenital muscular dystrophy, Laminin alpha2, Immunohistochemistry
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