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MELAS with the mitochondrial DNA 3243 point mutation: a neuropathological study.
Acta Neuropathologica 2000 January
We performed a neuropathological examination of the central nervous system from seven autopsied patients with mitochondrial myopathy, encephalopathy, lactic acidosis and stroke-like episodes (MELAS). Five of the seven cases were confirmed to have the mitochondrial DNA (mtDNA) 3243 point mutation. In addition to the changes reported previously, diffuse atrophy of the cerebral and cerebellar cortices, diffuse gliosis of cerebral and cerebellar white matter, and cactus formation of Purkinje cells were observed. Electron microscopy revealed accumulation of mitochondria in the cactus formations. These lesions are common in MELAS with the mtDNA 3243 point mutation, but cannot be explained solely by mitochondrial angiopathy, and suggest that intrinsic mitochondrial malfunction contributes to neuronal damage in MELAS pathology. Moreover, the pathological changes observed in the cerebellum suggest that cerebellar function should be evaluated more carefully at the clinical level.
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