Journal
CELL CYCLE
Volume 10, Issue 17, Pages 2904-2916Publisher
LANDES BIOSCIENCE
DOI: 10.4161/cc.10.17.17060
Keywords
RNA processing; tRNA; transcriptomics; mitochondria
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Funding
- Australian Research Council
- National Health and Medical Research Council of Australia
- Cancer Council of Western Australia
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Mammalian mitochondrial DNA is transcribed as precursor polycistronic transcripts containing 13 mRNAs, 2 rRNAs, punctuated by 22 tRNAs. The mechanisms involved in the excision of mitochondrial tRNAs from these polycistronic transcripts have remained largely unknown. We have investigated the roles of ELAC2, mitochondrial RNase P proteins 1 and 3, and pentatricopeptide repeat domain protein 1 in the processing of mitochondrial polycistronic transcripts. We used a deep sequencing approach to characterize the 5' and 3' ends of processed mitochondrial transcripts and provide a detailed map of mitochondrial tRNA processing sites affected by these proteins. We show that MRPP 1 and MRPP 3 process the 5' ends of tRNAs and the 5' unconventional, non tRNA containing site of the CO1 transcript. By contrast, we find that ELAC2 and PTCD1 affect the 3' end processing of tRNAs. Finally, we found that MRPP 1 is essential for transcript processing, RNA modification, translation and mitochondrial respiration.
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