Phylogeny of the kinetoplastida: taxonomic problems and insights into the evolution of parasitism
Mem. Inst. Oswaldo Cruz
; 96(3): 397-402, Apr. 2001. ilus
Article
in English
| LILACS
| ID: lil-282853
Responsible library:
BR1.1
RESUMO
To further investigate phylogeny of kinetoplastid protozoa, the sequences of small subunit (18S) ribosomal RNA of nine bodonid isolates and ten isolates of insect trypanosomatids have been determined. The root of the kinetoplastid tree was attached to the branch of Bodo designis and/or Cruzella marina. The suborder Trypanosomatina appeared as a monophyletic group, while the suborder Bodonina was paraphyletic. Among bodonid lineages, parasitic organisms were intermingled with free-living ones, implying multiple transitions to parasitism and supporting the `vertebrate-first hypothesis'. The tree indicated that the genera Cryptobia and Bodo are artificial taxa. Separation of fish cryptobias and Trypanoplasma borreli as different genera was not supported. In trypanosomatids, the genera Leptomonas and Blastocrithidia were polyphyletic, similar to the genera Herpetomonas and Crithidia and in contrast to the monophyletic genera Trypanosoma and Phytomonas. This analysis has shown that the morphological classification of kinetoplastids does not in general reflect their genetic affinities and needs a revision
Full text:
Available
Collection:
International databases
Database:
LILACS
Main subject:
Phylogeny
/
Kinetoplastida
Limits:
Animals
Language:
English
Journal:
Mem. Inst. Oswaldo Cruz
Journal subject:
Tropical Medicine
/
Parasitology
Year:
2001
Document type:
Article
Affiliation country:
Czech Republic
/
RUSSIA
/
United States
Institution/Affiliation country:
Czech Academy of Sciences/CZ
/
Russian Academy of Sciences/RU
/
University of California/US