Summary
The species of theTetrahymena pyriformis complex present a conundrum with regard to their highly conservative morphology and widely divergent molecular characteristics. We have investigated the phylogenetic relationships among these species using the nucleotide sequences from the histone H3II/H4II region of the genome. This region includes portions of the two histone coding sequences, as well as the intergenic region. The DNA sequences of these regions were amplified by the polymerase chain reaction (PCR) and the sequence of each was determined. Nucleotide substitutions and insertions/deletions within this set of sequences were compared to determine the phylogenetic relationships among the species of the complex. These data yield phylogenetic trees with identical topologies when different tree-building routines are used, indicating that the data are very robust.Glaucoma chattoni was used as an outgroup to root the trees for this analysis. The genome organization ofG. chattoni and the divergence of its histone H3II/H4II region sequence relative to those of the complex clearly indicate that this species has diverged considerably from the complex. These results show that PCR amplification analysis is feasible over considerable evolutionary distances. However, DNA-DNA hybridization may be more useful than sequence analysis in resolving the relationships among the closely related species in the complex.
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Brunk, C.F., Kahn, R.W. & Sadler, L.A. Phylogenetic relationships amongTetrahymena species determined using the polymerase chain reaction. J Mol Evol 30, 290–297 (1990). https://doi.org/10.1007/BF02099999
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DOI: https://doi.org/10.1007/BF02099999