Molecular Genetics and Genomics

, Volume 281, Issue 5, pp 473–481 | Cite as

RNA editing: only eleven sites are present in the Physcomitrella patens mitochondrial transcriptome and a universal nomenclature proposal

  • Mareike Rüdinger
  • Helena T. Funk
  • Stefan A. Rensing
  • Uwe G. Maier
  • Volker KnoopEmail author
Original Paper


RNA editing in mitochondria and chloroplasts of land plants alters the coding content of transcripts through site-specific exchanges of cytidines into uridines and vice versa. The abundance of RNA editing in model plant species such as rice or Arabidopsis with some 500 affected sites in their organelle transcripts hinders straightforward approaches to elucidate its mechanisms. The moss Physcomitrella patens is increasingly being appreciated as an alternative plant model system, enhanced by the recent availability of its complete chloroplast, mitochondrial, and nuclear genome sequences. We here report the transcriptomic analysis of Physcomitrella mitochondrial mRNAs as a prerequisite for future studies of mitochondrial RNA editing in this moss. We find a strikingly low frequency of RNA editing affecting only eleven, albeit highly important, sites of C-to-U nucleotide modification in only nine mitochondrial genes. Partial editing was seen for two of these sites but no evidence for any silent editing sites (leaving the identity of the encoded amino acid unchanged) as commonly observed in vascular plants was found in Physcomitrella, indicating a compact and efficient organization of the editing machinery. Furthermore, we here wish to propose a unifying nomenclature to clearly identify and designate RNA editing positions and to facilitate future communication and database annotation.


Physcomitrella RNA editing Nomenclature Mitochondrial DNA 



Research in the authors’ laboratories is supported by grants from the Deutsche Forschungsgemeinschaft DFG, in particular SFB-TR1 (Marburg), and BMBF FRISYS (Freiburg). We thank Andrew Bozarth for comments on the manuscript. H.T.F. thanks Christopher Grosche for skilful lab assistance. M.R. is grateful to Julia Dreistein for concentrated and helpful work during a laboratory practical training and to Judith Schleppenbäumer and Thomas Münster, MPI Cologne, who have kindly provided the P. patens Gransden strain. We wish to dedicate this publication to the memory of Rudolf Hiesel, colleague, friend and co-discoverer of RNA editing in plants, who passed away much too early.


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Copyright information

© Springer-Verlag 2009

Authors and Affiliations

  • Mareike Rüdinger
    • 1
  • Helena T. Funk
    • 2
  • Stefan A. Rensing
    • 3
  • Uwe G. Maier
    • 2
  • Volker Knoop
    • 1
    Email author
  1. 1.Abteilung Molekulare Evolution, IZMB–Institut für Zelluläre und Molekulare BotanikUniversität BonnBonnGermany
  2. 2.Fachbereich Biologie, ZellbiologiePhilipps-Universität MarburgMarburgGermany
  3. 3.FRISYS, Faculty of BiologyUniversity of FreiburgFreiburgGermany

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