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Lipomatosis, proximal myopathy, and the mitochondrial 8344 mutation. A lipid storage myopathy?

✍ Scribed by Alfredo Muñoz-Málaga; Juan Bautista; Jose A. Salazar; Isabel Aguilera; Raul Garcia; Isidoro Chinchon; M. Dolores Segura; Yolanda Campos; Joaquin Arenas

Publisher
John Wiley and Sons
Year
2000
Tongue
English
Weight
253 KB
Volume
23
Category
Article
ISSN
0148-639X

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✦ Synopsis

Multiple symmetric lipomatosis (MSL) has been related in some cases to the 8344 point mutation of the tRNA-lysine gene of the mitochondrial DNA, mainly in the context of families with classic myoclonic epilepsy with ragged-red fibers (MERRF) and exceptionally in patients with proximal myopathy as the only manifestation of mitochondrial disease. We report on two families harboring the 8344 mutation. The patients presented with MSL and myopathy, expressed as limb girdle weakness in index cases and as exercise intolerance in the others. All muscle biopsies performed showed lipid storage apart from RRF and respiratory chain complexes deficiency. A possible explanation for both adipose proliferation and lipid storage myopathy in these cases is a disturbance in intermediary lipid metabolism secondary to mitochondrial respiratory chain deficiency that could be related via carnitine deficiency.

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