TDP-43 stabilises the processing intermediates of mitochondrial transcripts.

TDP-43 stabilises the processing intermediates of mitochondrial transcripts.
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DOI:
10.1038/s41598-017-06953-y
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发表时间:
2017-08-09
期刊:
影响因子:
4.6
通讯作者:
Takahashi N
Takahashi N
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Izumikawa K;Nobe Y;Yoshikawa H;Ishikawa H;Miura Y;Nakayama H;Nonaka T;Hasegawa M;Egawa N;Inoue H;Nishikawa K;Yamano K;Simpson RJ;Taoka M;Yamauchi Y;Isobe T;Takahashi N

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43 kDa的反式激活反应区DNA结合蛋白43(TDP-43)是肌萎缩侧索硬化症(ALS)致病基因的产物。尽管越来越多的证据表明线粒体功能障碍是TDP-43相关ALS发病机制的基础,但野生型TDP-43在线粒体中的作用尚不清楚。在这里,我们表明,小TDP-43人口存在于线粒体直接结合到一个子集的线粒体tRNA和前体RNA编码的L-链mtDNA。TDP-43的上调表达稳定了线粒体多顺反子转录物及其产物的加工中间体,包括电子传递和16 S mt-rRNA的组分,类似于在线粒体RNase P缺乏的细胞中观察到的表型。相反,TDP-43缺乏减少了加工中间体的数量并损害了线粒体功能。我们提出TDP-43通过调节线粒体转录物的加工在维持线粒体稳态中具有新的作用。
The 43-kDa trans-activating response region DNA-binding protein 43 (TDP-43) is a product of a causative gene for amyotrophic lateral sclerosis (ALS). Despite of accumulating evidence that mitochondrial dysfunction underlies the pathogenesis of TDP-43–related ALS, the roles of wild-type TDP-43 in mitochondria are unknown. Here, we show that the small TDP-43 population present in mitochondria binds directly to a subset of mitochondrial tRNAs and precursor RNA encoded in L-strand mtDNA. Upregulated expression of TDP-43 stabilised the processing intermediates of mitochondrial polycistronic transcripts and their products including the components of electron transport and 16S mt-rRNA, similar to the phenotype observed in cells deficient for mitochondrial RNase P. Conversely, TDP-43 deficiency reduced the population of processing intermediates and impaired mitochondrial function. We propose that TDP-43 has a novel role in maintaining mitochondrial homeostasis by regulating the processing of mitochondrial transcripts.
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