RNA processing in human mitochondria

doi:10.4161/cc.10.17.17060

RNA processing in human mitochondria

2014-10-28

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M. Isabel G. Lopez Sanchez

Anne-Marie J. Shearwood

Aleksandra Filipovska *

DOI：10.4161/cc.10.17.17060

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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.

Keyword:

RNA processing

tRNA

transcriptomics

mitochondria

RNA processing in human mitochondria

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