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Human Molecular Genetics, Vol 5, 123-129, Copyright © 1996 by Oxford University Press

ARTICLES

Complex I deficiency is associated with 3243G:C mitochondrial DNA in osteosarcoma cell cybrids

DR Dunbar, PA Moonie, M Zeviani and IJ Holt
Department of Biochemical Medicine, Ninewells Hospital, Dundee, UK.

143B.206 rho degrees cells were repopulated with mitochondria from a MELAS patient harbouring a mixture of 3243G:C and 3243A:T mitochondrial DNA. A number of biochemical assays were performed on selected cybrids with various proportions of the two types of mitochondrial DNA. These assays revealed a marked decrease in oxygen consumption with pyruvate, a complex I substrate, in cybrids containing 60% to 90% 3243G:C mitochondrial DNA. Moreover, these cybrids showed decreased synthesis of a number of polypeptides in a mitochondrial in vitro translation assay. A cybrid line with a very high level of 3243G:C mitochondrial DNA (95%) had additional deficiencies in complexes III and IV and there was a marked generalised decrease in mitochondrial translation in this cybrid. The observation of complex I deficiency is consistent with previously reported enzymatic measurements of muscle homogenates from MELAS patients with the 3243G:C mutation.
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