Defects of mitochondrial RNA turnover lead to the accumulation of double-stranded RNA in vivo.

Autor: Aleksandra Pajak, Isabelle Laine, Paula Clemente, Najla El-Fissi, Florian A Schober, Camilla Maffezzini, Javier Calvo-Garrido, Rolf Wibom, Roberta Filograna, Ashish Dhir, Anna Wedell, Christoph Freyer, Anna Wredenberg
Jazyk: angličtina
Rok vydání: 2019
Předmět:
Zdroj: PLoS Genetics, Vol 15, Iss 7, p e1008240 (2019)
Druh dokumentu: article
ISSN: 1553-7390
1553-7404
DOI: 10.1371/journal.pgen.1008240
Popis: The RNA helicase SUV3 and the polynucleotide phosphorylase PNPase are involved in the degradation of mitochondrial mRNAs but their roles in vivo are not fully understood. Additionally, upstream processes, such as transcript maturation, have been linked to some of these factors, suggesting either dual roles or tightly interconnected mechanisms of mitochondrial RNA metabolism. To get a better understanding of the turn-over of mitochondrial RNAs in vivo, we manipulated the mitochondrial mRNA degrading complex in Drosophila melanogaster models and studied the molecular consequences. Additionally, we investigated if and how these factors interact with the mitochondrial poly(A) polymerase, MTPAP, as well as with the mitochondrial mRNA stabilising factor, LRPPRC. Our results demonstrate a tight interdependency of mitochondrial mRNA stability, polyadenylation and the removal of antisense RNA. Furthermore, disruption of degradation, as well as polyadenylation, leads to the accumulation of double-stranded RNAs, and their escape out into the cytoplasm is associated with an altered immune-response in flies. Together our results suggest a highly organised and inter-dependable regulation of mitochondrial RNA metabolism with far reaching consequences on cellular physiology.
Databáze: Directory of Open Access Journals
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