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Plant mitochondrial RNA editing.

S Steinhauser1, S Beckert, I Capesius

  • 1Allgemeine Botanik, Universität Ulm, Germany.

Journal of Molecular Evolution
|March 27, 1999
PubMed
Summary
This summary is machine-generated.

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RNA editing, a process modifying RNA molecules, is widespread in mosses and hornworts but absent in complex liverworts and algae. This study clarifies its distribution in bryophytes, revealing significant variation in RNA editing frequencies.

Area of Science:

  • Plant Molecular Biology
  • Evolutionary Biology
  • Genomics

Background:

  • RNA editing, involving site-specific base changes in plant mitochondrial RNAs, is crucial for gene function.
  • Its distribution across bryophytes (mosses, liverworts, hornworts) has been incompletely understood, necessitating broader investigation.

Purpose of the Study:

  • To investigate the distribution and frequency of RNA editing in a diverse collection of bryophytes and green algae.
  • To clarify the evolutionary patterns of RNA editing in early land plants.

Main Methods:

  • Analysis of the mitochondrial nad5 gene (1104 nt) sequences from a large dataset of bryophytes and green algae.
  • Confirmation of predicted RNA editing events using cDNA analysis in selected species.

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Main Results:

  • RNA editing was predicted in 30 mosses, 2 hornworts, and 7 Jungermanniidae liverworts, with editing frequencies up to 6% in codons.
  • No RNA editing was detected in 7 Marchantiidae liverworts and green algae.
  • cDNA analysis confirmed predicted C-to-U edits and U-to-C edits that correct stop codons in hornworts.

Conclusions:

  • RNA editing is prevalent in mosses, hornworts, and simple liverworts (Jungermanniidae), but absent in complex liverworts (Marchantiidae) and green algae.
  • The findings provide insights into the evolutionary history and diversification of RNA editing in land plants.