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The general assumption that mitochondrial DNA (mtDNA) does not undergo recombination has been challenged recently in invertebrates. Here we present the first direct evidence for recombination in the mtDNA of a vertebrate, the flounder Platichthys flesus. The control region in the mtDNA of this flatfish is characterized by the presence of a variable number of tandem repeats and a high level of heteroplasmy. Two types of repeats were recognized, differing by two C-T point mutations. Most individuals carry a pure "C" or a pure "T" array, but one individual showed a compound "CT" array. Such a compound array is evidence for recombination in the mtDNA control region from the flounder.

Heteroplasmy and Evidence for Recombination in the Mitochondrial Control Region of the Flatfish Platichthys flesus