The phylogenetic position of enteromonads: a challenge for the present models of diplomonad evolution
Language English Country Great Britain, England Media print
Document type Journal Article, Research Support, Non-U.S. Gov't
PubMed
16014510
DOI
10.1099/ijs.0.63542-0
Knihovny.cz E-resources
- MeSH
- Diplomonadida classification genetics MeSH
- Phylogeny * MeSH
- Evolution, Molecular * MeSH
- Molecular Sequence Data MeSH
- DNA, Protozoan analysis MeSH
- DNA, Ribosomal analysis MeSH
- RNA, Ribosomal genetics MeSH
- Turtles parasitology MeSH
- Animals MeSH
- Check Tag
- Animals MeSH
- Publication type
- Journal Article MeSH
- Research Support, Non-U.S. Gov't MeSH
- Names of Substances
- DNA, Protozoan MeSH
- DNA, Ribosomal MeSH
- RNA, Ribosomal MeSH
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.
References provided by Crossref.org
GENBANK
AY701872, AY701873, AY701874
