Site-specific circularisation at an intragenic sequence in Oenothera mitochondria |
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Authors: | Enzo Manna and Axel Brennicke |
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Affiliation: | (1) Lehrstuhl für Spezielle Botanik der Universität Tübingen, Auf der Morgenstelle 1, D-7400 Tübingen, Federal Republic of Germany |
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Abstract: | Summary The mitochondrial genome of Oenothera is divided between a number of circular molecules that are derived from master circles containing the total sequence complexity. The circularisation event which leads to the formation of one of the small molecules involves a decanucleotide within the region coding for the large ribosomal RNA. This decanucleotide, 5-GGAAGCAGCC-3, is repeated 7.5 kb further downstream. The repeat recombines with the intragenic sequence to form circle no. 3, which thus contains the 3 part of the large rRNA gene. The other theoretical result from such a circularisation with the 5 part of the gene cannot be detected in the mitochondrial genome, thus eliminating the reformation of the original sequence arrangement. Different models are discussed for this apparent non-reciprocal circularisation. |
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Keywords: | Mitochondrial plasmids Oenothera Site-specific circularisation 26S rDNA |
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