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The Journal of Heredity 1998:89(1)
© 1998 The American Genetic Association 89:1-7

Tandem repeat polymorphism and heteroplasmy in the mitochondrial control region of redfishes (Sebastes: Scorpaenidae)

P Bentzen1, JM Wright2, LT Bryden2, M Sargent2, and KCT Zwanenburg3

1Marine Molecular Biotechnology Laboratory, University of Washington, 3707 Brooklyn Ave. N. E., Seattle, WA 98105-6715, USA 2Biology Department, Dalhousie University, Halifax, Nova Scotia, Canada 3Bedford Institute of Oceanography, Department of Fisheries and Oceans, Dartmouth, Nova Scotia, Canada

Three species of redfish (Sebastes) share a common pattern of mitochondrial DNA tandem repeat polymorphism and heteroplasmy in the northwest Atlantic Ocean. All three species exhibit 9-17 copies of an approximately 275 base pair (bp) tandem repeat situated within the 3' domain of the control region. Sequence analysis of cloned mtDNA from S. mentella revealed that the tandem array is adjacent to the tRNAphe gene, and that the repeat shares 53% identity with the tRNAphe gene and part of the 12S rRNA gene. These features, as well as potential secondary structure assumed by the repeat, are consistent with previously proposed models explaining tandem duplications in the 3' end of the control region. In a sample comprising 36 S. fasciatus, 52 S. mentella, and 13 S. marinus taken near Newfoundland, neither the mean number of repeats per fish (12.2-12.7) nor the frequency of heteroplasmy varied significantly among species. A total of 42% of the redfishes were heteroplasmic, bearing either two or three repeat variants (33% and 9%, respectively). The similarity of the frequency distributions of tandem repeat variants in the three species suggests either a common balance between mutation and selection in the three species, or mitochondrial gene flow between them.


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