Screen for mitochondrial DNA copy number maintenance genes reveals essential role for ATP synthase.

Screen for mitochondrial DNA copy number maintenance genes reveals essential role for ATP synthase.
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DOI:
10.15252/msb.20145117
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发表时间:
2014-06-21
影响因子:
9.9
通讯作者:
Jacobs HT
Jacobs HT
中科院分区:
生物学1区
文献类型:
--
作者:
Fukuoh A;Cannino G;Gerards M;Buckley S;Kazancioglu S;Scialo F;Lihavainen E;Ribeiro A;Dufour E;Jacobs HT

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线粒体DNA(mtDNA)的维护机制只有部分特征,并由于其参与疾病而引起广泛关注。为了确定这种机制的新成分,以及mtDNA活力所需的其他细胞途径,我们在果蝇S2细胞中实施了全基因组RNAi筛选,测定了DNA嵌入剂PicoGreen染色的mtDNA类核苷酸的荧光损失。除了先前表征的mtDNA复制和转录机制的组分外,阳性还包括胞质蛋白酶体和核糖体的许多蛋白质(但不包括线粒体核糖体),三种参与囊泡转运的蛋白质,一些参与线粒体生物发生或核基因表达的其他因子,> 30种主要未表征的蛋白质和ATP合酶的大多数亚基(但没有其他OXPHOS复合物)。ATP合酶敲低导致线粒体ROS产生激增,随后是拷贝数耗竭,涉及线粒体周转增加,不依赖于典型的自噬机制。我们的研究结果将为未来的研究提供信息,包括mtDNA维持的装置和调节,以及线粒体生物能量学和信号在调节mtDNA拷贝数中的作用。
The machinery of mitochondrial DNA (mtDNA) maintenance is only partially characterized and is of wide interest due to its involvement in disease. To identify novel components of this machinery, plus other cellular pathways required for mtDNA viability, we implemented a genome-wide RNAi screen in Drosophila S2 cells, assaying for loss of fluorescence of mtDNA nucleoids stained with the DNA-intercalating agent PicoGreen. In addition to previously characterized components of the mtDNA replication and transcription machineries, positives included many proteins of the cytosolic proteasome and ribosome (but not the mitoribosome), three proteins involved in vesicle transport, some other factors involved in mitochondrial biogenesis or nuclear gene expression, > 30 mainly uncharacterized proteins and most subunits of ATP synthase (but no other OXPHOS complex). ATP synthase knockdown precipitated a burst of mitochondrial ROS production, followed by copy number depletion involving increased mitochondrial turnover, not dependent on the canonical autophagy machinery. Our findings will inform future studies of the apparatus and regulation of mtDNA maintenance, and the role of mitochondrial bioenergetics and signaling in modulating mtDNA copy number.
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