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Phylogeny of Trypanosoma (megatrypanum) theileri and related trypanosomes reveals lineages of isolates associated with artiodactyl hosts diverging on ssu and its ribosomal sequences

A. C. Rodrigues F Paiva; Marta Campaner; J. R Stevens; H. A Noyes; Marta Maria Geraldes Teixeira; Congresso do Instituto de Ciências Biomédicas (4. 2005 São Paulo)

Resumos São Paulo: Comissão de Cultura e Extensão Universitária do ICB/USP, 2005

São Paulo Comissão de Cultura e Extensão Universitária do ICB/USP 2005

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  • Título:
    Phylogeny of Trypanosoma (megatrypanum) theileri and related trypanosomes reveals lineages of isolates associated with artiodactyl hosts diverging on ssu and its ribosomal sequences
  • Autor: A. C. Rodrigues
  • F Paiva; Marta Campaner; J. R Stevens; H. A Noyes; Marta Maria Geraldes Teixeira; Congresso do Instituto de Ciências Biomédicas (4. 2005 São Paulo)
  • Materias: PARASITOLOGIA
  • Es parte de: Resumos São Paulo: Comissão de Cultura e Extensão Universitária do ICB/USP, 2005
  • Notas locales: Disponível somente em CD-ROM
  • Descripción: Aims: Phylogenetic relationships between non-pathogenic T. theileri and allied species parasitic in artiodactyls, and trypanosome species pathogenic for these hosts were never addressed. We analysed SSU and ITS ribosomal sequences of these trypanosomes aiming: a) to infer phylogenetic relationships among isolates from water buffalo, cattle and fallow deer; b) to assess the genetic polymorphism among Brazilian isolates from cattle and water buffalo from distant geographic regions; c) to analyse relationships of non-pathogenic and pathogenic trypanosomes parasitic in artiodactyls. Methods and Results: T. theileri trypanosomes from distant Brazilian regions and from other countries were tightly clustered in the clade T. theileri, distant from the T. brucei clade of pathogenic parasites of artiodactyls, and from trypanosomes of all other mammalian orders. The existence of this monophyletic assemblage (T. theileri clade) composed only by isolates from artiodactyls justifies the recognition of the subgenus Megatrypanum with T. theileri as its type species. Phylogenies based on SSU and ITS1 sequences produced the same branching pattern and 5 lineages: A, related to water buffalo; B, C and D, to cattle; E, to fallow deer. Conclusion: The pattern of host specificity allied to some congruence between host and parasite phylogenies suggested association of T. theileri trypanosomes with their respective mammalian hosts. Segregation of cattle isolates into three lineages
    revealed an overall geographical structure. Positioning of trypanosomes infecting tabanids in the T. theileri clade is consistent with the role of these flies as vectors of these trypanosomes
  • Editor: São Paulo Comissão de Cultura e Extensão Universitária do ICB/USP
  • Fecha de creación: 2005
  • Formato: res. 280.
  • Idioma: Inglés
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