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Related Experiment Videos

Eutherian phylogeny as inferred from mitochondrial DNA sequence data

Y Cao1, J Adachi, M Hasegawa

  • 1Institute of Statistical Mathematics, Tokyo, Japan.

Idengaku Zasshi
|October 1, 1994
PubMed
Summary
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Mitochondrial genome analysis supports Rodentia as an outgroup and Cetacea, Artiodactyla, and Carnivora as a clade. However, ribosomal RNA data alone presents limitations in accurately resolving primate and related mammal evolutionary relationships.

Area of Science:

  • Molecular Biology
  • Evolutionary Biology
  • Genomics

Background:

  • Understanding the evolutionary history of mammals is crucial for biological classification.
  • Mitochondrial genomes offer valuable data for phylogenetic studies due to their conserved nature.
  • Previous molecular studies have proposed various evolutionary relationships among mammalian orders.

Purpose of the Study:

  • To investigate the phylogenetic relationships among key mammalian orders: Primates, Artiodactyla, Cetacea, Carnivora, and Rodentia.
  • To assess the reliability of mitochondrial genome-encoded protein sequences and ribosomal RNA for phylogenetic inference.
  • To evaluate the congruence of molecular data with established mammalian evolutionary hypotheses.

Main Methods:

  • Phylogenetic analyses using maximum likelihood (ML) and maximum parsimony methods.

Related Experiment Videos

  • Amino acid sequence data from mitochondrial genomes of selected mammalian orders.
  • Inclusion of Marsupialia, Aves, and Amphibia as outgroups for rooting the phylogenetic trees.
  • Analysis of individual protein-coding genes and mitochondrial ribosomal RNA (12S and 16S rRNA) sequences.

    • Main Results:

    • Overall analyses of mitochondrial protein-coding genes strongly support Rodentia as an outgroup to the other four eutherian orders.
    • A distinct clade comprising Cetacea and Artiodactyla, with Carnivora as a sister taxon, was consistently identified.
    • Analyses of individual proteins and ribosomal RNA sequences showed some inconsistencies, with certain genes rejecting the overall consensus tree.
    • 12S rRNA sequences did not consistently support the consensus tree, while 16S rRNA results were dependent on alignment and outgroup choice.

    Conclusions:

    • Mitochondrial protein-coding genes provide robust evidence for the proposed phylogenetic relationships among these mammalian orders.
    • Mitochondrial ribosomal RNA genes alone may have limitations in phylogenetic inference, yielding less consistent results.
    • Synthesizing data from multiple genes is essential for drawing reliable conclusions in molecular phylogenetics.
    • Further research incorporating a wider range of genes is recommended for a comprehensive understanding of mammalian evolution.