Regulation of the Poly(A) Status of Mitochondrial mRNA by Poly(A)-Specific Ribonuclease Is Conserved among Land Plants

Mai Kanazawa, Yoko Ikeda, Ryuichi Nishihama, Shohei Yamaoka, Nam-Hee Lee, Katsuyuki T Yamato, Takayuki Kohchi, Takashi Hirayama

    Research output: Contribution to journalArticlepeer-review

    4 Citations (Scopus)


    Regulation of the stability and the quality of mitochondrial RNA is essential for the maintenance of mitochondrial and cellular functions in eukaryotes. We have previously reported that the eukaryotic poly(A)-specific ribonuclease (PARN) and the prokaryotic poly(A) polymerase encoded by AHG2 and AGS1, respectively, coordinately regulate the poly(A) status and the stability of mitochondrial mRNA in Arabidopsis. Mitochondrial function of PARN has not been reported in any other eukaryotes. To know how much this PARN-based mitochondrial mRNA regulation is conserved among plants, we studied the AHG2 and AGS1 counterparts of the liverwort, Marchantia polymorpha, a member of basal land plant lineage. We found that M. polymorpha has one ortholog each for AHG2 and AGS1, named MpAHG2 and MpAGS1, respectively. Their Citrine-fused proteins were detected in mitochondria of the liverwort. Molecular genetic analysis showed that MpAHG2 is essential and functionally interacts with MpAGS1 as observed in Arabidopsis. A recombinant MpAHG2 protein had a deadenylase activity in vitro. Overexpression of MpAGS1 and the reduced expression of MpAHG2 caused an accumulation of polyadenylated Mpcox1 mRNA. Furthermore, MpAHG2 suppressed Arabidopsis ahg2-1 mutant phenotype. These results suggest that the PARN-based mitochondrial mRNA regulatory system is conserved in land plants.

    Original languageEnglish
    Pages (from-to)470-480
    Number of pages11
    JournalPlant & cell physiology
    Issue number3
    Publication statusPublished - Mar 1 2020


    • Arabidopsis
    • Marchantia polymorpha
    • Mitochondria
    • Poly(A) polymerase
    • Poly(A) regulation
    • Poly(A)-specific ribonuclease

    ASJC Scopus subject areas

    • Physiology
    • Plant Science
    • Cell Biology


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