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Int J Syst Evol Microbiol 55 (2005), 1729-1733; DOI  10.1099/ijs.0.63542-0
© 2005 International Union of Microbiological Societies

The phylogenetic position of enteromonads: a challenge for the present models of diplomonad evolution

Martin Kolisko, Ivan Cepicka, Vladimír Hampl, Jaroslav Kulda and Jaroslav Flegr

Department of Parasitology, Faculty of Science, Charles University, Prague, Czech Republic

Correspondence
Martin Kolisko
martin.kolisko{at}seznam.cz

Unikaryotic enteromonads and diplokaryotic diplomonads have been regarded as closely related protozoan groups. It has been proposed that diplomonads originated within enteromonads in a single event of karyomastigont duplication. This paper presents the first study to address these questions using molecular phylogenetics. The sequences of the small-subunit rRNA genes for three isolates of enteromonads were determined and a tree constructed with available diplomonad, retortamonad and Carpediemonas sequences. The diplomonad sequences formed two main groups, with the genus Giardia on one side and the genera Spironucleus, Hexamita and Trepomonas on the other. The three enteromonad sequences formed a clade robustly situated within the diplomonads, a position inconsistent with the original evolutionary proposal. The topology of the tree indicates either that the diplokaryotic cell of diplomonads arose several times independently, or that the monokaryotic cell of enteromonads originated by secondary reduction from the diplokaryotic state.

Abbreviations: SSU, small subunit

Published online ahead of print on 14 March 2005 as DOI 10.1099/ijs.0.63542-0.

The GenBank/EMBL/DDBJ accession numbers for the small-subunit rRNA sequences of enteromonad isolates KR-PO3, RAPI1 and TRION are AY701872, AY701873 and AY701874, respectively.






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