Cited by 198Evolution and Paleontology StudiesGenomics and Phylogenetic StudiesPaleontology and Evolutionary Biology

Tetrapod phylogeny inferred from 18S and 28S ribosomal RNA sequences and a review of the evidence for amniote relationships.

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S. Blair Hedges, Kirk D. Moberg, Linda R. Maxson·1990·Molecular Biology and Evolution

Abstract

The 18S ribosomal RNAs of 21 tetrapods were sequenced and aligned with five published tetrapod sequences. When the coelacanth was used as an outgroup, Lissamphibia (living amphibians) and Amniota (amniotes) were found to be statistically significant monophyletic groups. Although little resolution was obtained among the lissamphibian taxa, the amniote sequences support a sister-group relationship between birds and mammals. Portions of the 28S ribosomal RNA (rRNA) molecule in 11 tetrapods also were sequenced, although the phylogenetic results were inconclusive. In contrast to previous studies, deletion or down-weighting of base-paired sites were found to have little effect on phylogenetic relationships. Molecular evidence for amniote relationships is reviewed, showing that three genes (beta-hemoglobin, myoglobin, and 18S rRNA) unambiguously support a bird-mammal relationship, compared with one gene (histone H2B) that favors a bird-crocodilian clade. Separate analyses of four other genes (alpha-crystallin A, alpha-hemoglobin, insulin, and 28S rRNA) and a combined analysis of all sequence data are inconclusive, in that different groups are defined in different analyses and none are strongly supported. It is suggested that until sequences become available from a broader array of taxa, the molecular evidence is best evaluated at the level of individual genes, with emphasis placed on those studies with the greatest number of taxa and sites. When this is done, a bird-mammal relationship is most strongly supported. When regarded in combination with the morphological evidence for this association, it must be considered at least as plausible as a bird-crocodilian relationship.

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Crossref · 10.1093/oxfordjournals.molbev.a040628

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  • In vertebrate mt-rDNA as well as in nuclear rDNA, transversions tend to occur much less frequently than transitions.

    “In vertebrate mt-rDNA (Hixson and Brown 1986) as well as in nuclear rDNA (Larson and Wilson 1989;Hedges et al. 1990), transversions tend to occur much less frequently than transitions.”

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Authors
Hedges, S. B., Moberg, K. D., & Maxson, L. R.
Affiliations
Pennsylvania State University (US)
Venue
Molecular Biology and Evolution
Published
1990-11
Volume
7
Issue
6
Pages
607-33
ISSN
  • 0737-4038 (ISSN-L)
  • 1537-1719
OpenAlex
W2291705348
Cited by
198
References
29
Citations by year
2025: 1 · 2023: 3 · 2022: 1 · 2021: 2 · 2020: 2 · 2019: 3 · 2018: 2 · 2017: 3 · 2016: 1 · 2015: 3 · 2014: 6 · 2013: 2 · 2012: 7
FWCI
20.18
Type
journal article
Language
en
Open access
Locations
  • Molecular Biology and Evolution (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Science Foundation
  • University of Illinois at Urbana-Champaign
Topics
  • Physical Sciences › Earth and Planetary Sciences › Paleontology › Evolution and Paleontology Studies
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Genomics and Phylogenetic Studies
  • Physical Sciences › Earth and Planetary Sciences › Paleontology › Paleontology and Evolutionary Biology
Keywords
tetrapod phylogeny, 18S rRNA, 28S rRNA, Lissamphibia, amniotes, myoglobin, histone H2B, insulin, monophyly
MeSH terms
Animals, Base Sequence, Biological Evolution, Humans, Molecular Sequence Data, Phylogeny, RNA, Ribosomal, 18S, RNA, Ribosomal, 28S

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