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Nucleic Acids Research, 1990, Vol. 18, No. 13 3771-3776
© 1990

MOLECULAR BIOLOGY

Editing of the wheat coxIII transcript: evidence for twelve C to U and one U to C conversions and for sequence similarities around editing sites

José M. Gualberto, Jacques-Henry Weil and Jean-Michel Grienenberger*

Institut de Biologie Moléculaire des Plantes, Université Louis Pasteur 12 rue du général Zimmer, 67000 Strasbourg, France

* To whom correspondence should be addressed

Received April 11, 1990. Revised June 6, 1990. Accepted June 6, 1990.

The complete cDNA sequence corresponding to the wheat coxlll gene transcript (coding for subunit 3 of cytochrome oxidase) has been determined by a method involving cDNA synthesis using specific oligonucleotides as primers followed by PCR amplification, cloning and sequencing of the amplification products. In 12 different clones, the same 13 nucleotide modifications have been found as compared to the genomic mitochondrial DNA sequence. Among these modifications, 12 are C/emdash U conversions which change codons identities, thereby increasing the homology between the wheat COXIII protein and the corresponding protein of non-plant organisms. The 13th modification is a silent U-C conversion which seems to be an unfrequent editing eventin plant mitochondria. Homologies can be found between sequences surrounding editing sites in the coxlll transcript and in other wheat mitochondrial transcripts. The presence of such homology suggests that these sequences could base-pair with a common RNA molecule which might be involved in editing site recognition.


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