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Crypthecodinium and Tetrahymena: an exercise in comparative evolution.

R M Preparata1, C A Beam, M Himes

  • 1Department of Ecology, Ethology and Evolution, University of Illinois, Urbana 61801.

Journal of Molecular Evolution
|March 1, 1992
PubMed
Summary
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Dinoflagellate species show less ribosomal D2 region variation than ciliate protozoa, indicating a more homogeneous species complex. This molecular uniformity impacts their breeding compatibility and evolutionary divergence.

Area of Science:

  • Molecular Evolution
  • Phylogenetics
  • Marine Biology

Background:

  • The D2 region of large ribosomal RNA (rRNA) is a valuable marker for studying evolutionary relationships.
  • Understanding genetic diversity within dinoflagellate species complexes is crucial for their taxonomy and evolution.
  • Comparative analysis with ciliated protozoa provides insights into different evolutionary strategies.

Purpose of the Study:

  • To determine the nucleotide sequences of the D2 region of large rRNA for over 60 dinoflagellate strains.
  • To construct a phylogenetic tree for the dinoflagellate species complex Crypthecodinium cohnii.
  • To compare the molecular variation and evolutionary patterns of dinoflagellates with ciliated protozoa.

Main Methods:

  • Sequencing of the D2 region of large rRNA from over 60 dinoflagellate strains.

Related Experiment Videos

  • Phylogenetic analysis using PHYLOGEN string analysis programs.
  • Comparison of sequence data with existing datasets for ciliated protozoa (Tetrahymena-related).

    • Main Results:

    • Dinoflagellate species complexes are significantly more homogeneous in ribosomal D2 variation compared to ciliate species.
    • Mean sequence differences were 7 for dinoflagellates versus 22 for ciliates, with dinoflagellates showing only base substitutions.
    • Several dinoflagellate species exhibited identical D2 regions, and some species were polymorphic, unlike monomorphic ciliate sibling species.

    Conclusions:

    • The Crypthecodinium cohnii species complex exhibits remarkable molecular uniformity, suggesting a more recent evolutionary origin or different evolutionary pressures.
    • Differences in molecular variation, genetic economies, and breeding compatibility highlight distinct evolutionary trajectories between dinoflagellates and ciliates.
    • Dinoflagellates may generate incompatible progeny more readily, potentially through mutations facilitating sympatric speciation.