Pajak 2019 PLoS Genet

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Publications in the MiPMap
Pajak A, Laine I, Clemente P, El-Fissi N, Schober FA, Maffezzini C, Calvo-Garrido J, Wibom R, Filograna R, Dhir A, Wedell A, Freyer C, Wredenberg A (2019) Defects of mitochondrial RNA turnover lead to the accumulation of double-stranded RNA in vivo. PLoS Genet 15:e1008240.

» PMID: 31365523 Open Access

Pajak A, Laine I, Clemente P, El-Fissi N, Schober FA, Maffezzini C, Calvo-Garrido J, Wibom R, Filograna R, Dhir A, Wedell A, Freyer C, Wredenberg A (2019) PLoS Genet

Abstract: 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.


Bioblast editor: Plangger M


Labels: MiParea: Respiration, mtDNA;mt-genetics, Genetic knockout;overexpression 


Organism: Drosophila 

Preparation: Permeabilized tissue 


Coupling state: LEAK, OXPHOS  Pathway: N, S, CIV  HRR: Oxygraph-2k 

Labels, 2019-08