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Phylogenetic position of the trichomonad parasite of turkeys, Histomonas meleagridis (Smith) Tyzzer, inferred from small subunit rRNA sequence

Lookup NU author(s): Dr Christophe Noel


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The phylogenetic position of the trichomonad, Histomonas meleagridis was determined by analysis of small subunit rRNAs. Molecular trees including all identified parabasalid sequences available in data bases were inferred by distance, parsimony, and likelihood methods. All reveal a close relationship between H. meleagridis, and Dientamoeba fragilis. Moreover, small subunit rRNAs of both amoeboid species have a reduced G + C content and increased chain length relative to other parabasalids. Finally, the rRNA genes from H. meleagridis and D. fragilis share a recent common ancestor with Tritrichomonasfoetus, which exhibits a more developed cytoskeleton. This indicates that Histomonas and Dientamoeba secondarily lost most of the typical trichomonad cytoskeletal structures and hence, do not represent primitive morphologies. A global phylogeny of parabasalids revealed significant discrepancies with morphology-based classifications, such as the polyphyly of most of the parabasalid families and classes included in our study.

Publication metadata

Author(s): Noel C; Gerbod D; Edgcomb VP; Zenner L; Wintjens R; Delgado-Viscogliosi P; Holder ME; Sogin ML; Viscogliosi E

Publication type: Article

Publication status: Published

Journal: Journal of Eukaryotic Microbiology

Year: 2001

Volume: 48

Issue: 4

Pages: 498-504

ISSN (print): 1066-5234

ISSN (electronic): 1550-7408

Publisher: Wiley-Blackwell Publishing Ltd.


DOI: 10.1111/j.1550-7408.2001.tb00185.x

Notes: 1066-5234 Journal Article


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