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Nucleic Acids Research 2005 33(1):337-346; doi:10.1093/nar/gki179
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Published online 13 January 2005

© 2005, the authors Nucleic Acids Research, Vol. 33 No. 1 © Oxford University Press 2005; all rights reserved
The online version of this article has been published under an open access model. Users are entitled to use, reproduce, disseminate, or display the open access version of this article for non-commercial purposes provided that: the original authorship is properly and fully attributed; the Journal and Oxford University Press are attributed as the original place of publication with the correct citation details given; if an article is subsequently reproduced or disseminated not in its entirety but only in part or as a derivative work this must be clearly indicated. For commercial re-use permissions, please contact journals.permissions{at}oupjournals.org.

Article

Multiple promoters are a common feature of mitochondrial genes in Arabidopsis

Kristina Kühn, Andreas Weihe and Thomas Börner*

Institut für Biologie/Genetik, Humboldt-Universität zu Berlin Chausseestr. 117, D-10115 Berlin, Germany

*To whom correspondence should be addressed. Tel: +49 30 20938140; Fax: +49 30 20938141; Email: thomas.boerner{at}rz.hu-berlin.de

Received November 15, 2004. Revised December 20, 2004. Accepted December 20, 2004.

Mitochondrial genes in the plant Arabidopsis thaliana are transcribed by two phage-type RNA polymerases encoded in the nucleus. Little is known about cis-elements that are recognized by these enzymes and mediate the transcription of the Arabidopsis mitochondrial genome. Here, 30 transcription initiation sites of 12 mitochondrial genes and gene clusters have been determined using 5'-RACE and ribonuclease protection analysis of primary transcripts labelled in vitro by guanylyltransferase. A total of 9 out of 12 genes were found to possess multiple promoters, revealing for the first time that multiple promoters are a common feature of mitochondrial genes in a dicotyledonous plant. No differences in promoter utilization were observed between leaves and flowers, suggesting that promoter multiplicity reflects a relaxed promoter specificity rather than a regulatory role of promoter selection. Nearly half the identified transcription initiation sites displayed immediately upstream a CRTA core sequence, which was mostly seen within the previously described CRTAAGAGA promoter motif or a novel CGTATATAA promoter element. About as many promoters possessed an ATTA or RGTA core. Our data indicate that the majority of mitochondrial promoters in Arabidopsis deviate significantly from the nonanucleotide consensus derived earlier for dicot mitochondrial promoters.


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