[No authors listed]
Targeted RNA editing by C-to-U alteration occurs at hundreds of sites in the mitochondrial transcriptome of flowering plants. By using natural variation and positional cloning on a population of Arabidopsis recombinant inbred lines between the ecotypes Col and Ler, we found that two of these occurrences involve the Arabidopsis PPR-DYW protein REME2 (Required for Efficiency of Mitochondrial Editing2). The analysis of a knockdown mutant along with silenced tissues confirms the specificity of REME2 for both sites located in mitochondrial ribosomal protein genes (rps3-1534 and rps4-175). The conservation level of both cis elements is relatively high, as is the amino acid conservation among flowering plants for both genes in that location, underlining the importance of these editing events and REME2.
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