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  • Title: Differential RNA editing in closely related introns in Oenothera mitochondria.
    Author: Lippok B, Brennicke A, Wissinger B.
    Journal: Mol Gen Genet; 1994 Apr; 243(1):39-46. PubMed ID: 7514712.
    Abstract:
    Introns a/b of the nad2 gene and b/c of the nad1 gene in Oenothera mitochondria were found to be closely related. Within a scaffold of conserved sequence regions, a 48 bp sequence element covering intron domain V and flanking nucleotides is identical in both group II introns. The third nucleotide of this element is edited in the nad2, but not in the nad1 intervening sequence. The C to U editing event compensates an nad2-specific nucleotide mismatch in the stem domain IV and thus improves secondary structure stability. This differential editing event indicates that the identical upstream 2 and downstream 45 nucleotides are not sufficient to specify this editing site. Comparison of adjacent exon editing patterns in spliced and unspliced transcripts shows a higher degree of editing in processed sequences, confirming that RNA editing is a posttranscriptional process in plant mitochondria.
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