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Journal of Molecular Evolution

, Volume 29, Issue 1, pp 40–51 | Cite as

Dinoflagellates in evolution. A molecular phylogenetic analysis of large subunit ribosomal RNA

  • G. Lenaers
  • L. Maroteaux
  • B. Michot
  • M. Herzog
Article

Summary

The sequence of the large subunit ribosomal RNA (LsuRNA) gene of the dinoflagellateProrocentrum micans has been determined. The inferred rRNA sequence [3408 nucleotides (nt)] is presented in its most probable secondary structure based on compensatory mutations, energy, and conservation criteria. No introns have been found but a hidden break is present in the second variable domain, 690 nt from the 5′ end, as judged by agarose gel electrophoresis and primer extension experiments.Prorocentrum micans LsuRNA length and G+C content are close to those of ciliates and yeast. The conserved portions of the molecule (1900 nt) have been aligned with corresponding sequences from various eukaryotes, including five protista, one metaphyta, and three metazoa. An extensive phylogenetic study was performed, comparing two phenetic methods (neighbor joining on difference matrix, and Fitch and Margoliash on Knuc values matrix) and one cladistic (parsimony). The three methods led to similar tree topologies, except for the emergence of yeast that groups with ciliates and dinoflagellates when phenetic methods are used, but emerges later in the most parsimonious tree. This discrepancy was checked by statistical analyses on reduced trees (limited to four species) inferred using parsimony and evolutionary parsimony methods. The data support the phenetic tree topologies and a close relationship between dinoflagellates, ciliates, and yeast.

Key words

Ribosomal gene sequence Large subunit rRNA Secondary structure Prorocentrum micans Dinoflagellate Phylogenetic tree 

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Copyright information

© Springer-Verlag New York Inc 1989

Authors and Affiliations

  • G. Lenaers
    • 1
  • L. Maroteaux
    • 1
  • B. Michot
    • 2
  • M. Herzog
    • 1
  1. 1.Département de Biologie Cellulaire et Moléculaire, Laboratoire AragoUniversité de Paris VI, CNRS UA 117Banyuls sur merFrance
  2. 2.Centre de Recherche de Biochimie et de Génetique Cellulaires du CNRSToulouse CedexFrance

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