Molecular Biology and Evolution 17:1334-1343 (2000)
© 2000 Society for Molecular Biology and Evolution
Regular Article |
The Complete Mitochondrial Genome of Tupaia belangeri and the Phylogenetic Affiliation of Scandentia to Other Eutherian Orders
Primate Genetics, German Primate Center, Göttingen, Germany
Abstract
The complete mitochondrial genome of Tupaia belangeri, a representative of the eutherian order Scandentia, was determined and compared with full-length mitochondrial sequences of other eutherian orders described to date. The complete mitochondrial genome is 16,754 nt in length, with no obvious deviation from the general organization of the mammalian mitochondrial genome. Thus, features such as start codon usage, incomplete stop codons, and overlapping coding regions, as well as the presence of tandem repeats in the control region, are within the range of mammalian mitochondrial (mt) DNA variation. To address the question of a possible close phylogenetic relationship between primates and Tupaia, the evolutionary affinities among primates, Tupaia and bats as representatives of the Archonta superorder, ferungulates, guinea pigs, armadillos, rats, mice, and hedgehogs were examined on the basis of the complete mitochondrial DNA sequences. The opossum sequence was used as an outgroup. The trees, estimated from 12 concatenated genes encoded on the mitochondrial H-strand, add further molecular evidence against an Archonta monophyly. With the new data described in this paper, most of both the mitochondrial and the nuclear data point away from Scandentia as the closest extant relatives to primates. Instead, the complete mitochondrial data support a clustering of Scandentia with Lagomorpha connecting to the branch leading to ferungulates. This closer phylogenetic relationship of Tupaia to rabbits than to primates first received support from several analyses of nuclear and partial mitochondrial DNA data sets. Given that short sequences are of limited use in determining deep mammalian relationships, the partial mitochondrial data available to date support this hypothesis only tentatively. Our complete mitochondrial genome data therefore add considerably more evidence in support of this hypothesis.
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