Cybrid studies establish the causal link between the mtDNA m.3890G>A/MT-ND1 mutation and optic atrophy with bilateral brainstem lesions

Cybrid studies establish the causal link between the mtDNA m.3890G>A/MT-ND1 mutation and optic atrophy with bilateral brainstem lesions

Complex I (CI) deficiency is a frequent cause of mitochondrial disorders and, in most cases, is due to mutations in CI subunit genes encoded by mitochondrial DNA (mtDNA). In this study, we establish the pathogenic role of the heteroplasmic mtDNA m.3890G>A/MT-ND1 (p.R195Q) mutation, which affects...

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Bibliographic Details
Main Authors: Caporali, Leonardo, Ghelli, Anna Maria, Iommarini, Luisa, Maresca, Alessandra, Valentino, Maria Lucia, La Morgia, Chiara, Liguori, Rocco, Zanna, Claudia, Barboni, Piero, De Nardo, Vera, Martinuzzi, Andrea, Rizzo, Giovanni, Tonon, Caterina, Lodi, Raffaele, Calvaruso, Maria Antonietta, Cappelletti, Martina, Porcelli, Anna Maria, Achilli, Alessandro, Pala, Maria, Torroni, Antonio, Carelli, Valerio
Format: Online
Language:English
Published: Elsevier Pub. Co 2013
Online Access:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3778985/
Description
Summary:Complex I (CI) deficiency is a frequent cause of mitochondrial disorders and, in most cases, is due to mutations in CI subunit genes encoded by mitochondrial DNA (mtDNA). In this study, we establish the pathogenic role of the heteroplasmic mtDNA m.3890G>A/MT-ND1 (p.R195Q) mutation, which affects an extremely conserved amino acid position in ND1 subunit of CI. This mutation was found in a young-adult male with optic atrophy resembling Leber's hereditary optic neuropathy (LHON) and bilateral brainstem lesions. The only previously reported case with this mutation was a girl with fatal infantile Leigh syndrome with bilateral brainstem lesions. Transfer of the mutant mtDNA in the cybrid cell system resulted in a marked reduction of CI activity and CI-dependent ATP synthesis in the presence of a normally assembled enzyme.

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