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Massive RNA Editing in Ascetosporean Mitochondria. | LitMetric

Massive RNA Editing in Ascetosporean Mitochondria.

Microbes Environ

Department of Marine Science and Technology, Faculty of Marine Science and Technology, Fukui Prefecture University.

Published: March 2025

Ascetosporeans are parasitic protists of invertebrates. A deep sequencing ana-lysis of species within the orders Mikrocytida, Paramyxida, and Haplosporida using metagenomic approaches revealed that their mitochondria were functionally reduced and their organellar genomes were lacking. Ascetosporeans belonging to the order Paradinida have not been sequenced, and the nature of their mitochondria remains unclear. We herein established two cultures of Paradinida and conducted DNA and RNA sequencing ana-lyses. The results obtained indicate that mitochondrial function in paradinids was not reduced and their organellar genomes were retained. In contrast, their mitochondrial genomes were involved in massive A-to-I and C-to-U substitution types of RNA editing. All edits in protein-coding genes were nonsynonymous substitutions, and likely had a restorative function against negative mutations. Furthermore, we detected possible sequences of DYW type of pentatricopeptide repeat (PPR-DYW) protein and a homologue of adenosine deaminase acting on RNA (ADAR-like), which are key enzymes for C-to-U and A-to-I substitutions, respectively. An immunofluorescence ana-lysis showed that ADAR-like of paradinids may specifically localize within mitochondria. These results expand our knowledge of the diversity and complexity of organellar RNA editing phenomena.

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Source
http://dx.doi.org/10.1264/jsme2.ME24070DOI Listing

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