The Journal of Heredity 1985:76(5):321-324
© 1985 The American Genetic Association 76:321-324
research-article |
Maternal inheritance of mitochondrial DNA during backcrossing of two species of mice
Dr. Gyllensten is affiliated with the Department of Biochemistry, the University of California, Berkeley, CA 94720, and the Department of Genetics, the University of Stockholm, S-106 91 Stockhoim, Sweden; Mr. Wharton is affiliated with the New York Zoological Society, Bronx Zoo, Bronx, NY 10460, and the Department of Biological Science, Fordham University, Bronx, NY 10458; Dr. Wilson is affiliated with the Department of Biochemistry, the University of California, Berkeley, CA 94720. This study was supported financially by the National Science Foundation (to A.C.W.) and the National Institutes of Health (to A.C.W.), the National Swedish Research Council (to Nils Ryman, Department of Genetics, University of Stockholm, Sweden), and the Sweden-America Foundation (to U.G.). The authors thank Dr. Russell Higuchi and Mr. Chris Martin for doing the reconstruction experiments with spretus and domesticus mtDNAs, and Dr. Oliver Ryder for valuable suggestions. Drs. Rebecca Cann, Stephen Palumbi, and Ellen Prager kindly reviewed a preliminary version of the paper. Please address reprint requests to Dr. Wilson.
Abstract
As Judged by restriction analysis, mitochondrial DNA shows strictly maternal inheritance during 68 generations of backcrossing in both directions between Mus domesticus and Mus spretus. The average number of paternal mitochondrial genomes contributed to the next generation is estimated to be no more than one per thousand maternal mitochondrial genomes contributed. Despite the estimated accumulation of over 2000 mutational differences between M. spretus and M. domesticus mtDNAs since their divergence from a common ancestor, each of these mitochondrial DNAs, whether on a M. spretus or a M. domesticus nuclear background, allows mice to develop with seemingly normal viability and fertility.
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