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J Neurol Sci. 2003 Oct 15;214(1-2):17-20.

Late onset of stroke-like episode associated with a 3256C-->T point mutation of mitochondrial DNA.

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The Copenhagen Muscle Research Center, National University Hospital, Rigshospitalet, Copenhagen, Denmark.


Mitochondrial encephalopathy, lactic acidosis, and stroke-like episodes (MELAS) are usually associated with the common 3243A-->G mutation of mtDNA. Onset of stroke-like episodes usually occurs before age 30. We report a patient with late onset MELAS harboring a rare 3256C-->T mutation in the tRNA(Leu(UUR)) gene of mtDNA. The patient presented with a stroke-like episode at age 36. MRI showed a stroke-like lesion in the right parietooccipital brain region. Proton MR spectroscopy showed elevated lactate concentrations in the lesion (8.4 mmol/l), and in the mid-occipital region (2.3-3.2 mmol/l) that appeared normal on MRI. Further tests revealed evidence of a severe oxidative defect of muscle metabolism as well.

[Indexed for MEDLINE]

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