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KMID : 1130620150110010097
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Journal of Clinical Neurology
2015 Volume.11 No. 1 p.97 ~ p.101
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Mild Clinical Features and Histopathologically Atypical Cores in Two Korean Families with Central Core Disease Harboring RYR1 Mutations at the C-Terminal Region
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Jung Na-Yeon
Park Yeong-Eun
Shin Jin-Hong
Lee Chang-Hun
Jung Dae-Soo
Kim Dae-Seong
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Abstract
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Background: Central core disease (CCD) is a congenital myopathy characterized by distinctive cores in muscle fibers. Mutations in the gene encoding ryanodine receptor 1 (RYR1) have been identified in most CCD patients.
Case Report: Two unrelated patients presented with slowly progressive or nonprogressive proximal muscle weakness since childhood. Their family history revealed some members with the same clinical problem. Histological analysis of muscle biopsy samples revealed numerous peripheral cores in the muscle fibers. RYR1 sequence analysis disclosed a novel mutation in exon 101 (c.14590T>C) and confirmed a previously reported mutation in exon 102 (c.14678G>A).
Conclusions: We report herein two families with CCD in whom missense mutations at the C-terminal of RYR1 were identified. Although it has been accepted that such mutations are usually associated with a severe clinical phenotype and clearly demarcated central cores, our patients exhibited a mild clinical phenotype without facial muscle involvement and skeletal deformities, and atypical cores in their muscle biopsy specimens.
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KEYWORD
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central core disease, ryanodine receptor 1, RYR1, core myopathy
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