Central core myopathy with RYR1 mutation masks 5q spinal muscular atrophy.

Abstract

We report the case of a male who presented in infancy with motor delay and muscle weakness. Typical muscle biopsy features and heterozygous RYR1 mutation confirmed a diagnosis of central core disease. Family studies showed this to be a de-novo mutation. Some years later, his two older teenage brothers presented with proximal muscle weakness. Neurophysiology, muscle biopsy and DNA studies confirmed spinal muscular atrophy. Subsequent genetic studies in the index case also confirmed homozygous deletions of exon 7 and 8 in the SMN gene. Review of the original muscle biopsy showed classical features of central core disease with no evidence to suggest denervation, such that the diagnosis of spinal muscular atrophy could not have been suspected in the absence of the family history.

• Authors: R Pandey, S Chandratre, A Roberts, J S M Dwyer, C Sewry, R Quinlivan
• Journal: European journal of paediatric neurology : EJPN : official journal of the European Paediatric Neurology Society (Eur J Paediatr Neurol) Vol. 15 Issue 1 Pg. 70-3 (Jan 2011) ISSN: 1532-2130 [Electronic] England
• PMID: 20452790 (Publication Type: Case Reports, Journal Article)
• Copyright: © 2010 European Paediatric Neurology Society. Published by Elsevier Ltd. All rights reserved.

Chemical References

• Ryanodine Receptor Calcium Release Channel

Topics

• Adolescent
• Biopsy
• Child
• Chromosomes, Human, Pair 5 (genetics)
• Genetic Predisposition to Disease (genetics)
• Humans
• Male
• Mutation (genetics)
• Myopathy, Central Core (genetics)
• Ryanodine Receptor Calcium Release Channel (genetics)
• Spinal Muscular Atrophies of Childhood (genetics)
• Young Adult