Hudson Gavin, Keers Sharon, Yu-Wai-Man Patrick, Griffiths Philip, Huoponen Kirsi, Savontaus Marja-Liisa, Nikoskelainen Eeva, Zeviani Massimo, Carrara Franco, Horvath Rita, Karcagi Veronika, Spruijt Liesbeth, de Coo I F M, Smeets Hubert J M, Chinnery Patrick F
Mitochondrial Research Group, The Medical School, Framlington Place, Newcastle upon Tyne, NE2 4HH, United Kingdom.
Am J Hum Genet. 2005 Dec;77(6):1086-91. doi: 10.1086/498176. Epub 2005 Oct 11.
Mitochondrial DNA (mtDNA) mutations are a major cause of human disease. A large number of different molecular defects ultimately compromise oxidative phosphorylation, but it is not clear why the same biochemical defect can cause diverse clinical phenotypes. There is emerging evidence that nuclear genes modulate the phenotype of primary mtDNA disorders. Here, we define an X-chromosomal haplotype that interacts with specific MTND mutations to cause visual failure in the most common mtDNA disease, Leber hereditary optic neuropathy. This effect is independent of the mtDNA genetic background and explains the variable penetrance and sex bias that characterizes this disorder.
线粒体DNA(mtDNA)突变是人类疾病的主要原因。大量不同的分子缺陷最终会损害氧化磷酸化,但尚不清楚为何相同的生化缺陷会导致不同的临床表型。越来越多的证据表明,核基因可调节原发性mtDNA疾病的表型。在此,我们定义了一种X染色体单倍型,它与特定的MTND突变相互作用,在最常见的mtDNA疾病——Leber遗传性视神经病变中导致视力丧失。这种效应独立于mtDNA遗传背景,并解释了该疾病所特有的可变外显率和性别偏差。