Cited by 399Evolution and Paleontology StudiesChromosomal and Genetic VariationsGenomics and Phylogenetic Studies

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Molecular evidence from retroposons that whales form a clade within even-toed ungulates

Abstract

The origin of whales and their transition from terrestrial life to a fully aquatic existence has been studied in depth. Palaeontological, morphological and molecular studies suggest that the order Cetacea (whales, dolphins and porpoises) is more closely related to the order Artiodactyla (even-toed ungulates, including cows, camels and pigs) than to other ungulate orders. The traditional view that the order Artiodactyla is monophyletic has been challenged by molecular analyses of variations in mitochondrial and nuclear DNA. We have characterized two families of short interspersed elements (SINEs) that were present exclusively in the genomes of whales, ruminants and hippopotamuses, but not in those of camels and pigs. We made an extensive survey of retropositional events that might have occurred during the divergence of whales and even-toed ungulates. We have characterized nine retropositional events of a SINE unit, each of which provides phylogenetic resolution of the relationships among whales, ruminants, hippopotamuses and pigs. Our data provide evidence that whales, ruminants and hippopotamuses form a monophyletic group.

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Research works printed but not linked: 25

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Metadata

Authors
Shimamura, M., Yasue, H., Ohshima, K., Abe, H., Kato, H., Kishiro, T., Goto, M., Munechika, I., & Okada, N.
Affiliations
  • Tokyo Institute of Technology (JP)
  • The Institute of Cetacean Research (JP)
Corresponding author
Okada, Norihiro
Venue
Nature
Published
1997-08-14
Volume
388
Issue
6643
Pages
666-670
ISSN
  • 0028-0836 (ISSN-L)
  • 1476-4687
OpenAlex
W1838926299
Cited by
399
References
23
Citations by year
2025: 6 · 2024: 1 · 2023: 3 · 2022: 4 · 2021: 4 · 2020: 4 · 2019: 10 · 2018: 5 · 2017: 9 · 2016: 10 · 2015: 8 · 2014: 9 · 2013: 10 · 2012: 8
FWCI
35.58
Type
journal article
Language
en
Open access
closed
Locations
  • Nature (publishedVersion)
  • PubMed (publishedVersion)
  • RePEc: Research Papers in Economics (submittedVersion)
  • Tokyo Tech Research Repository (Tokyo Institute of Technology) (submittedVersion)
Topics
  • Physical Sciences › Earth and Planetary Sciences › Paleontology › Evolution and Paleontology Studies
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Chromosomal and Genetic Variations
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Genomics and Phylogenetic Studies
Keywords
whale evolution, cetaceans, Artiodactyla, short interspersed nuclear elements, retroposition, monophyly, ruminants, phylogenetic relationships, molecular phylogeny
MeSH terms
Animals, Artiodactyla, Base Sequence, DNA, Humans, Molecular Sequence Data, Phylogeny, Whales, Sequence Alignment, Retroelements

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