ISSN:
1432-0533
Keywords:
Key words Myoclonus epilepsy
;
Mitochondrial
;
encephalomyopathy
;
Mitochondrial DNA
;
Mutation
;
Neuropathology
Source:
Springer Online Journal Archives 1860-2000
Topics:
Medicine
Notes:
Abstract This man with myoclonus epilepsy and ragged red fibres (MERRF) syndrome due to the tRNALys A→G(8344) mutation of mitochondrial DNA (mtDNA) died of bronchopneumonia at 18 years of age. He had progressive clinical symptoms from 6 months of age manifesting as ataxia, myoclonic seizures, and muscle weakness. A post-mortem examination revealed 91–99% mutated mtDNA in all 32 examined tissue samples, including various organs and different brain regions. The brain appeared without macroscopic changes, but microscopic examination showed degeneration with loss of nerve cells and gliosis affecting the globus pallidus, substantia nigra, red nucleus, dentate nucleus, inferior olivary nucleus, cerebellar cortex, and the spinal cord. Skeletal muscle showed cytochrome c oxidase deficient muscle fibres with proliferation of mitochondria. In addition to pathological changes of muscle and brain there were few morphological changes that could be attributed to his mitochondrial disease. These data support the concept that in patients with the tRNALys A→G(8344) mutation who are manifesting disease there are high levels of mutated mtDNA in all tissues, but only some tissues and brain regions are vulnerable.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00296519
Permalink