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Nucleic Acids Research, 2001, Vol. 29, No. 12 2484-2491
© 2001 Oxford University Press

Gene expression in isolated plant mitochondria: high fidelity of transcription, splicing and editing of a transgene product in electroporated organelles

Jean-Claude Farré and Alejandro Araya*

Laboratoire de Réplication et Expression des Gènes Eucaryotes et Rétroviraux, UMR 5097, Centre National de la Recherche Scientifique and Université Victor Segalen-Bordeaux 2, 146 rue Leo Saignat, 33076 Bordeaux Cedex, France

Mitochondrial gene expression was studied using an electrotransformation protocol to introduce foreign DNA into purified wheat mitochondria. Optimal conditions for DNA uptake and transient gene expression were determined. We show here that a DNA plasmid containing either a cognate or a non-cognate gene under the control of a plant mitochondrial promoter is incorporated into the organelle and faithfully recognized by the transcription machinery. Transcripts generated by a plasmid bearing the intron-containing cox II gene were correctly spliced. Moreover, the transcripts were edited at the expected target C residues. The expression and maturation process of the transgene is dependent on the integrity of functional elements such as the promotor or the presence of structural domains necessary for splicing. The mitochondrial transformation described in this report is an important tool to study the multiple steps involved in plant mitochondrial gene expression at conditions closer to those found in vivo.

* To whom correspondence should be addressed. Tel: +33 05 57 57 17 46; Fax: +33 05 57 57 17 66; Email: alexandre.araya{at}reger.u-bordeaux2.fr


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