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A new mutation in the skeletal ryanodine receptor gene ( RYR1 ) is potentially causative of malignant hyperthermia, central core disease, and severe skeletal malformation
Author(s) -
Rueffert Henrik,
Olthoff Derk,
Deutrich Christine,
Schober Ralf,
Froster Ursula G.
Publication year - 2003
Publication title -
american journal of medical genetics part a
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.064
H-Index - 112
eISSN - 1552-4833
pISSN - 1552-4825
DOI - 10.1002/ajmg.a.20404
Subject(s) - ryr1 , central core disease , malignant hyperthermia , missense mutation , biology , genetics , muscle biopsy , mutation , skeletal muscle , ryanodine receptor , pathology , gene , medicine , biopsy , anatomy , receptor
Abstract Malignant hyperthermia susceptibility (MHS) and central core disease (CCD) have been shown to result from missense mutations in the ryanodine receptor gene of the skeletal muscle ( RYR1 ). A 15‐year‐old patient who had spondylocostal dysostosis (SCD) developed an MH crisis during general anesthesia. The patient was characterized phenotypically by block vertebrae, vertebral fusion, short neck and thorax, fused ribs, craniofacial abnormalities, spina bifida occulta, and a diaphragmatic defect closed surgically in early infancy. The diagnosis MH susceptible (MHS) was confirmed by the in vitro contracture test (IVCT) on a muscle biopsy. Surprisingly, the histopathological investigation revealed the presence of CCD too. Molecular genetic investigation of the RYR1 gene was performed to search for known MH‐related mutations. Cluster regions of the RYR1 gene, in which mutations have already been found, were examined by direct automated sequencing. In addition to the diagnosis MHS and CCD we were able to identify a novel RYR1 mutation in exon 46: 7358ATC > ACC, resulting in an Ile2453Thr substitution. This mutation was also present in the mother, in whom MH disposition and CCD were determined by muscle investigations. We suggest that the newly identified RYR1 mutation is closely associated with MH and CCD. A probable causative role of the RYR1 gene in SCD patients should be assessed by further genetic investigations. © 2003 Wiley‐Liss, Inc.