Abstract
Physical mapping studies indicate a novel sequence arrangement, consisting of three circular chromosomes, for the mitochondrial genome of Brassica campestris (Chinese cabbage, turnip). A master chromosome, 218 kilobases (kb) long, contains the entire sequence complexity of the mitochondrial genome, including two copies of an ∼2-kb element present as direct repeats separated by 135 and 83kb. The two smaller circles are 135 and 83kb in size, contain one copy each of the 2-kb repeat element, and are postulated to interconvert with the master chromosome via a co-integration-resolution pathway mediated by reciprocal recombination within the 2-kb repeat.
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Palmer, J., Shields, C. Tripartite structure of the Brassica campestris mitochondrial genome. Nature 307, 437–440 (1984). https://doi.org/10.1038/307437a0
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DOI: https://doi.org/10.1038/307437a0
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