Journal Article TDP-43 stabilises the processing intermediates of mitochondrial transcripts

Izumikawa, Keiichi  ,  Nobe, Yuko  ,  Yoshikawa, Harunori  ,  Ishikawa, Hideaki  ,  Miura, Yutaka  ,  Nakayama, Hiroshi  ,  Nonaka, Takashi  ,  Hasegawa, Masato  ,  Egawa, Naohiro  ,  Inoue, Haruhisa  ,  Nishikawa, Kouki  ,  Yamano, Koji  ,  Simpson, Richard J.  ,  Taoka, Masato  ,  Yamauchi, Yoshio  ,  Isobe, Toshiaki  ,  Takahashi, Nobuhiro

72017-08-09 , Springer Nature
ISSN:2045-2322
Description
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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http://repository.kulib.kyoto-u.ac.jp/dspace/bitstream/2433/227897/1/s41598-017-06953-y.pdf

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