Journal of Molecular Evolution

, Volume 43, Issue 4, pp 357–373 | Cite as

Secondary structure and patterns of evolution among mammalian mitochondrial 12S rRNA molecules

  • Mark S. Springer
  • Emmanuel Douzery


Forty-nine complete 12S ribosomal RNA (rRNA) gene sequences from a diverse assortment of mammals (one monotreme, 11 marsupials, 37 placentals), including 11 new sequences, were employed to establish a “core” secondary structure model for mammalian 12S rRNA. Base-pairing interactions were assessed according to the criteria of potential base-pairing as well as evidence for base-pairing in the form of compensatory mutations. In cases where compensatory evidence was not available among mammalian sequences, we evaluated evidence among other vertebrate 12S rRNAs. Our results suggest a core model for secondary structure in mammalian 12S rRNAs with deletions as well as additions to the Gutell (1994:Nucleic Acids Res. 22) models forBos andHomo. In all, we recognize 40 stems, 34 of which are supported by at least some compensatory evidence within Mammalia. We also investigated the occurrence and conservation in mammalian 12S rRNAs of nucleotide positions that are known to participate in the decoding site inE. coli. Twenty-four nucleotide positions known to participate in the decoding site inE. coli also occur among mammalian 12S rRNAs and 17 are invariant for the same base as inE. coli. Patterns of nucleotide substitution were assessed based on our secondary structure model. Transitions in loops become saturated by approximately 10–20 million years. Transitions in stems, in turn, show partial saturation at 20 million years but divergence continues to increase beyond 100 million years. Transversions accumulate lin early beyond 100 million years in both stems and loops although the rate of accumulation of transversions is three- to fourfold higher in loops. Presumably, this difference results from constraints to maintain pairing in stems.

Key words

Mitochondrial 12S rRNA Secondary structure Evolutionary rates Nucleotide substitution patterns Mammalia 


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Copyright information

© Springer-Verlag New York Inc. 1996

Authors and Affiliations

  • Mark S. Springer
    • 1
  • Emmanuel Douzery
    • 2
  1. 1.Department of BiologyUniversity of CaliforniaRiversideUSA
  2. 2.Laboratoire de PaleontologieInstitut des Sciences de l'EvolutionMontpellierFrance

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