Phylogeny of Trichomonads Inferred from Small‐Subunit rRNA Sequences

Journal of Eukaryotic Microbiology - Tập 42 Số 4 - Trang 411-415 - 1995
John H. Gunderson1, Gregory Hinkle1, Detlev D. Leipe1, Hilary G. Morrison1, Shawn K. Stickel1, David A. Odelson2, John A. Breznak3, Thomas A. Nerad4, Miklós Müller5, Mitchell L. Sogin1
1Center for Molecular Evolution, Marine Biological Laboratory, Woods Hole, Massachusetts 02543.
2Department of Biology, Central Michigan University, Mount Pleasant, Michigan 48859
3Department of Microbiology, Michigan State University, East Lansing, Michigan 48824‐1101
4Protistology Department, American Type Culture Collection, Rockville, Maryland 20852-1776
5The Rockefeller University 1230 York Ave. New York, New York 10021

Tóm tắt

ABSTRACT. Small subunit (16S‐like) ribosomal RNA sequences were obtained from representatives of all four families constituting the order Trichomonadida. Comparative sequence analysis revealed that the Trichomonadida are a monophyletic lineage and a deep branch of the eukaryotic tree. Relative to other early divergent eukaryotic assemblages the branching pattern within the Trichomonadida is very shallow. This pattern suggests the Trichomonadida radiated recently, perhaps in conjunction with their animal hosts. From a morphological perspective the Devescovinidae and Calonymphidae are considered more derived than the Monocercomonadidae and Trichomonadidae. Molecular trees inferred by distance, parsimony and likelihood techniques consistently show the Devescovinidae and Calonymphidae are the earliest diverging lineages within the Trichomonadida, however bootstrap values do not strongly support a particular branching order. In an analysis of all known 16S‐like ribosomal RNA sequences, the Trichomonadida share most recent common ancestry with unidentified protists from the hindgut of the termite Reticulitermes flavipes. The position of two putative free‐living trichomonads in the tree is indicative of derivation from symbionts rather than direct descent from some free‐living ancestral trichomonad.

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Thông tin
Thông tin xuất bản

Journal of Eukaryotic Microbiology

Tập 42 Số 4

411-415

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