Cargando…

Mild Clinical Features and Histopathologically Atypical Cores in Two Korean Families with Central Core Disease Harboring RYR1 Mutations at the C-Terminal Region

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 nonprogr...

Descripción completa

Detalles Bibliográficos
Autores principales: Jung, Na-Yeon, Park, Yeong-Eun, Shin, Jin-Hong, Lee, Chang Hun, Jung, Dae-Soo, Kim, Dae-Seong
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Korean Neurological Association 2015
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4302187/
https://www.ncbi.nlm.nih.gov/pubmed/25628744
http://dx.doi.org/10.3988/jcn.2015.11.1.97
Descripción
Sumario: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.