Nucleic Acids Research, 1992, Vol. 20, No. 21 5641-5646
© 1992
MOLECULAR BIOLOGY |
The mitochondrial gene encoding ribosomal protein S12 has been translocated to the nuclear genome in Oenothera
Institut für Genbiologische Forschung Ihnestraße 63, D-1000 Berlin 33, Germany
* To whom correspondence should be addressed
Received August 17, 1992. Revised October 7, 1992. Accepted October 7, 1992.
The Oenothera mitochondrial genome contains only a gene fragment for ribosomal protein S12 (rps12), while other plants encode a functional gene in the mitochondrion. The complete Oenothera rps12 gene is located in the nucleus. The transit sequence necessary to target this protein to the mitochondrion is encoded by a 5'-extension of the open reading frame. Comparison of the amino acid sequence encoded by the nuclear gene with the polypeptides encoded by edited mitochondrial cDNA and genomic sequences of other plants suggests that gene transfer between mitochondrion and nucleus started from edited mitochondrial RNA molecules. Mechanisms and requirements of gene transfer and activation are discussed.
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