A novel mutation (8342G→A) in the mitochondrial tRNALys gene associated with progressive external ophthalmoplegia and myoclonus

被引:27
作者
Tiranti, V
Carrara, F
Confalonieri, P
Mora, M
Maffei, RM
Lamantea, E
Zeviani, M
机构
[1] IRCCS, Natl Neurol Inst, Div Biochem & Genet, I-20133 Milan, Italy
[2] IRCCS, Natl Neurol Inst, Div Muscle Pathol, Milan, Italy
关键词
mitochondrial tRNA(Lys); ophthalmoplegia; cytochrome c oxidase;
D O I
10.1016/S0960-8966(98)00103-5
中图分类号
R74 [神经病学与精神病学];
学科分类号
摘要
We describe a patient who suffered from impaired ocular motility from age 10 years and at 16 years developed ptosis, proximal weakness and progressive fatigability. At 35 years she developed massive myoclonic jerks, and head and distal tremor. A muscle biopsy showed a high percentage of cytochrome c oxidase negative fibers but no ragged-red fibers. A novel heteroplasmic mutation (8342G --> A) was found in the mitochondrial transfer RNA(Lys) gene by single-strand conformation polymorphism screening, followed by sequence and restriction fragment length polymorphism analysis. Approximately 80% of muscle mitochondrial DNA (mtDNA) harbored the mutation, while the mutation was absent in lymphocyte DNA of the proband, as well as of her mother, daughter and a maternal aunt. However, the pathogenicity of the mutation was confirmed by restriction fragment length polymorphism analysis of single muscle fibers, which revealed a significantly greater level of mutant mtDNA in cytochrome c oxidase negative over cytochrome c oxidase positive fibers. (C) 1999 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:66 / 71
页数:6
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