Journal
MITOCHONDRION
Volume 18, Issue -, Pages 18-26Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.mito.2014.08.008
Keywords
Leber's hereditary optic neuropathy; Mitochondria; Mutation; NADH:ubiquinone oxidoreductase; Maternal inheritance
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Funding
- Ministry of Science and Technology of the People's Republic of China [2012BAI09B03]
- Natural Science Foundation of China [31471191, 81200724, 81400434]
- Ministry of Science and Technology of Zhejiang Province [2013R10042]
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In this report, we investigated the molecular mechanism underlying Leber's hereditary optic neuropathy (LHON)-associated mitochondrial m.3635G>A (p.S110N, ND1) mutation. A mutational screening of ND1 gene in a cohort of 1070 Han Chinese subjects LHON identified the m.3635G>A mutation in nine Chinese families with suggestively maternally transmitted LHON. Thirty-eight (22 males/16 females) of 162 matrilineal relatives in these families exhibited the variable severity and age-at-onset of optic neuropathy. Molecular analysis of their mitochondria(genomes identified the homoplasmic m.3635G>A mutation and distinct sets of polymorphisms belonging to the Asian haplogroups G2a1, R11a, D4, R11a, M7b2, G1a, F1a1, B4, and N9a3, respectively. Using cybrids constructed by transferring mitochondria from lymphoblastoid cell lines derived from one Chinese family into mtDNA-less (rho(0)) cells, we showed similar to 27% decrease in the activity of NADH:ubiquinone oxidoreductase (complex I) in mutant cybrids carrying the m.3635G>A mutation, compared with control cybrids. The respiratory deficiency caused by the m.3635G>A mutation results in decreased efficiency of mitochondrial ATP synthesis. These mitochondrial dysfunctions caused an increase in the production of reactive oxygen species in the mutant cybrids. The data provide the direct evidence for the m.3635G>A mutation leading to LHON. Our findings may provide new insights into the understanding of pathophysiology of LHON. (C) 2014 Elsevier B.V. and Mitochondria Research Society. All rights reserved.
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