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Journal of Neurology, Neurosurgery, and Psychiatry logoLink to Journal of Neurology, Neurosurgery, and Psychiatry
. 1993 Aug;56(8):900–905. doi: 10.1136/jnnp.56.8.900

Mitochondrial encephalomyopathy: variable clinical expression within a single kindred.

D Crimmins 1, J G Morris 1, G L Walker 1, C M Sue 1, E Byrne 1, S Stevens 1, B Jean-Francis 1, C Yiannikas 1, R Pamphlett 1
PMCID: PMC1015147  PMID: 8350109

Abstract

The clinical manifestations of mitochondrial encephalomyopathy are described in four generations of a single kindred. The age of onset of major neurological disturbance varied from 3-70 years. In some patients, deafness was the only manifestation; in others, recurrent bouts of status epilepticus associated with focal neurological deficits and headache, caused severe disability or death. Examples of all three adult forms of mitochondrial encephalomyopathy: MELAS, MERFF and Kearns Sayre syndrome, were represented within the kindred. Associated features included deafness, short stature, non-insulin-dependent diabetes mellitus, migraine, peptic ulceration and severe constipation. The nt 3243 A-G MELAS mutation was detected in two members of the kindred. This study highlights the diversity of clinical expression of a mitochondrial mutation within a single kindred.

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