Journal of Molecular Evolution

, Volume 22, Issue 3, pp 231–236 | Cite as

5S and 5.8S ribosomal RNA evolution in the suborder tetrahymenina (Ciliophora: Hymenostomatida)

  • Craig T. Van Bell


The nucleotide sequences of the 5S and 5.8S rRNAs of eight strains of tetrahymenine ciliates have been determined. The sequences indicate a clear distinction betweenTetrahymena paravorax and its suggested conspecificT. vorax, but leave the taxonomic distinction betweenT. vorax andT. leucophrys in doubt. The rRNA sequences of sixTetrahymena species and of three other species of the suborder Tetrahymenina have been used to deduce evolutionary schemes in which ancestral rRNA sequences and changes are proposed. These schemes suggest the predominant acceptance of G→A and C→T transitions in the 5S rDNA during the evolution of the suborder.

Key words

5S rRNA 5.8S rRNA Ribosomal RNA evolution Tetrahymena evolution 


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Copyright information

© Springer-Verlag 1985

Authors and Affiliations

  • Craig T. Van Bell
    • 1
  1. 1.Department of Genetics and DevelopmentUniversity of IllinoisUrbanaUSA

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