A new phenotype of mitochondrial disease characterized by familial late-onset predominant axial myopathy and encephalopathy
- نوع فایل : کتاب
- زبان : انگلیسی
- مؤلف : Yusuke Sakiyama Yuji Okamoto Itsuro Higuchi Yukie Inamori Yoko Sangatsuda Kumiko Michizono Osamu Watanabe Hideyuki Hatakeyama Yu-ichi Go
- چاپ و سال / کشور: 2011
Description
Axial myopathy is a rare neuromuscular disease that is characterized by paraspinal muscle atrophy and abnormal posture, most notably camptocormia (also known as bent spine). The genetic cause of familial axial myopathy is unknown. Described here are the clinical features and cause of late-onset predominant axial myopathy and encephalopathy. A 73-year-old woman presented with a 10-year history of severe paraspinal muscle atrophy and cerebellar ataxia. Her 84-year-old sister also developed late-onset paraspinal muscle atrophy and generalized seizures with encephalopathy. Computed tomography showed severe atrophy and fatty degeneration of their paraspinal muscles. Their mother and maternal aunt also developed bent spines. The existence of many ragged-red fibers and cytochrome c oxidase-negative fibers in the biceps brachii muscle of the proband indicated a mitochondrial abnormality. No significant abnormalities were observed in the respiratory chain enzyme activities; however, the activities of complexes I and IV were relatively low compared with the activities of other complexes. Sequence analysis of the mitochondrial DNA from the muscle revealed a novel heteroplasmic mutation (m.602C[T) in the mitochondrial tRNAPhe gene. This familial case of late-onset predominant axial myopathy and encephalopathy may represent a new clinical phenotype of a mitochondrial disease
Acta Neuropathol (2011) 121:775–783 DOI 10.1007/s00401-011-0818-y Received: 20 January 2011 / Revised: 11 March 2011 / Accepted: 11 March 2011 / Published online: 22 March 2011
