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Molecular and Cellular Biology, December 2002, p. 8448-8456, Vol. 22, No. 24
0270-7306/02/$04.00+0     DOI: 10.1128/MCB.22.24.8448-8456.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

Cross-Competition in Transgenic Chloroplasts Expressing Single Editing Sites Reveals Shared cis Elements

Anne-Laure Chateigner-Boutin and Maureen R. Hanson*

Department of Molecular Biology and Genetics, Cornell University, Ithaca, New York 14853

Received 1 July 2002/ Returned for modification 20 August 2002/ Accepted 18 September 2002

RNA editing in organelles of angiosperm plants results in alteration of Cs to Us in transcripts. In most editing sites analyzed in vitro or in vivo, sequences within approximately 30 nucleotides (nt) 5' and 10 nt 3' of the edited C have been found to be required for selection of the correct C editing target and for editing efficiency, but no consensus sequences have been identified. The effect of high-level expression of two different minigenes carrying either the rpoB-2 or the ndhF-2 editing site on editing was determined for all 31 known edited Cs in two transgenic tobacco lines. The editing efficiencies of both the corresponding rpoB and ndhF editing sites in the endogenous genes' transcripts and in several other genes' transcripts were reduced in the chloroplast transgenic plants. Conserved nucleotides could be identified in the sequences immediately 5' of each overexpressed editing site and in the sites in the additional genes that experienced a competition effect, though the conserved nucleotides differ 5' of rpoB-2 and 5' of ndhF-2. Inspection of sequences surrounding chloroplast and mitochondrial editing sites reveals that they can be grouped into clusters which carry conserved nucleotides within 30 nt 5' of the C target of editing. The data are consistent with a model in which the same trans factor recognizes several chloroplast or mitochondrial editing sites, depending on the particular sequence 5' of the edited C.

* Corresponding author. Mailing address: Department of Molecular Biology and Genetics, Biotech Building, Cornell University, Ithaca, NY 14853. Phone: (607) 254-4833. Fax: (607) 255-6249. E-mail: Mrh5{at}cornell.edu.

Molecular and Cellular Biology, December 2002, p. 8448-8456, Vol. 22, No. 24
0022-538X/02/$04.00+0     DOI: 10.1128/MCB.22.24.8448-8456.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.



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