Molecular phylogeny of phyllopharyngean ciliates and their group I introns

The Journal of Eukaryotic Microbiology
Oona L O Snoeyenbos-WestLaura A Katz

Abstract

We analyzed small subunit ribosomal DNA (ssu-rDNA) sequences to evaluate both the monophyly of the ciliate class Phyllopharyngea de Puytorac et al. (1974), and relationships among subclasses. Classifications based on morphology and ultrastructure divide the Phyllopharyngea into four subclasses, the Phyllopharyngia, Chonotrichia, Rhynchodia, and Suctoria. Our analyses of ssu-rDNA genealogies derived from sequence data collected from diverse members representing three of the four subclasses of Phyllopharyngea (Suctoria: Ephelota spp., Prodiscophyra collini, Acineta sp.; Phyllopharyngia: Chlamydodon exocellatus, Chlamydodon triquetrus, Dysteria sp.; and Chonotrichia: Isochona sp.) provide strong support for the monophyly of the Phyllopharyngea, and show that the Chonotrichia emerge from within the Phyllopharyngia. Based on this initial sampling, suctorian budding types are monophyletic, and exogenous budding appears to be basal to evaginative and endogenous budding. Further, we report the discovery of a group I intron at position 891 in the Suctoria Acineta sp. and Tokophrya lemnarum, and a second group I intron at position 1506 in T. lemnarum. These introns represent only the second examples of group I introns in a ciliate riboso...Continue Reading

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Citations

Oct 9, 2007·Molecular Phylogenetics and Evolution·Micah DunthornLaura A Katz
Jul 16, 2009·The Journal of Eukaryotic Microbiology·Jun GongWeibo Song

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Datasets Mentioned

BETA
AY332717
AY332719

Methods Mentioned

BETA
PCR
light microscopy

Software Mentioned

MacClade
Megalign DNAStar
PAUP
Clustal W
Modeltest

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