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Journal of Molecular Evolution

, Volume 32, Issue 2, pp 167–177 | Cite as

The evolutionary position of the rhodophytePorphyra umbilicalis and the basidiomyceteLeucosporidium scottii among other eukaryotes as deduced from complete sequences of small ribosomal subunit RNA

  • L. Hendriks
  • R. De Baere
  • Y. Van de Peer
  • J. Neefs
  • A. Goris
  • R. De Wachter
Article

Summary

The complete small ribosomal subunit RNA (srRNA) sequence was determined for the red algaPorphyra umbilicalis and the basidiomyceteLeucosporidium scottii, representing two taxa for which no srRNA sequences were hitherto known. These sequences were aligned with other published complete srRNA sequences of 58 eukaryotes. Evolutionary trees were reconstructed by a matrix optimization method from a dissimilarity matrix based on sections of the alignment that correspond to structurally conservative areas of the molecule that can be aligned unambiguously. The overall topology of the eukaryotic tree thus constructed is as follows: first there is a succession of early diverging branches, leading to a diplomonad, a microsporidian, a euglenoid plus kinetoplastids, an amoeba, and slime molds. Later, a nearly simultaneous radiation seems to occur into a number of taxa comprising the metazoa, the red alga, the sporozoa, the higher fungi, the ciliates, the green plants, plus some other less numerous groups. Because the red alga diverges late in the evolutionary tree, it does not seem to represent a very primitive organism as proposed on the basis of morphological and 5S rRNA sequence data.

Asco- and basidiomycetes do not share a common ancestor in our tree as is generally accepted on the basis of conventional criteria. In contrast, when all alignment positions, rather than the more conservative ones, are used to construct the evolutionary tree, higher fungi do form a monophyletic cluster. The hypothesis that higher fungi and red algae might have shared a common origin has been put forward. Although the red alga and fungi seem to diverge at nearly the same time, no such relationship can be detected.

The newly determined sequences can be fitted into a secondary structure model for srRNA, which is now relatively well established with the exception of uncertainties in a number of eukaryote-specific expansion areas. A specific structural model featuring a pseudoknot is proposed for one of these areas.

Key words

Evolution of eukaryotes Small ribosomal subunit RNA sequence Rhodophyte Basidiomycete RNA secondary structure 

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Copyright information

© Springer-Verlag New York Inc 1991

Authors and Affiliations

  • L. Hendriks
    • 1
  • R. De Baere
    • 1
  • Y. Van de Peer
    • 1
  • J. Neefs
    • 1
  • A. Goris
    • 1
  • R. De Wachter
    • 1
  1. 1.Departement BiochemieUniversiteit Antwerpen (UIA)AntwerpenBelgium

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