title: Transcriptomic analyses of the avirulent protozoan parasite Trypanosoma rangeli.
abstract: Two species of the genus Trypanosoma infective to humans have been extensively studied at a cell and molecular level, but study of the third, Trypanosoma rangeli, remains in relative infancy. T. rangeli is non-pathogenic, but is frequently mistaken for the related Chagas disease agent Trypanosoma cruzi with which it shares vectors, hosts, significant antigenicity and a sympatric distribution over a wide geographical area. In this study, we present the T. rangeli gene expression profile as determined by the generation of ESTs (Expressed Sequence Tags) and ORESTES (Open Reading Frame ESTs). A total of 4208 unique high quality sequences were analyzed, composed from epimastigote and trypomastigote forms of SC-58 and Choachí strains, representing the two major phylogenetic lineages of this species. Comparative analyses with T. cruzi and other parasitic kinetoplastid species allowed the assignment of putative biological functions to most of the sequences generated and the establishment of an annotated T. rangeli gene expression database. Even though T. rangeli is apathogenic to mammals, genes associated with virulence in other pathogenic kinetoplastids were found. Transposable elements and genes associated mitochondrial gene expression, specifically RNA editing components, are also described for the first time. Our studies confirm the close phylogenetic relationship between T. cruzi and T. rangeli and enable us to make an estimate for the size of the T. rangeli genome repertoire ( approximately 8500 genes).
authors.affiliation: Universidade Federal de Santa Catarina, Florianópolis 88040-970, SC, Brazil. grisard@ccb.ufsc.br
authors.forename: Edmundo C
authors.initials: EC
authors.lastname: Grisard
authors.forename: Patrícia H
authors.initials: PH
authors.lastname: Stoco
authors.forename: Glauber
authors.initials: G
authors.lastname: Wagner
authors.forename: Thaís C M
authors.initials: TC
authors.lastname: Sincero
authors.forename: Gianinna
authors.initials: G
authors.lastname: Rotava
authors.forename: Juliana B
authors.initials: JB
authors.lastname: Rodrigues
authors.forename: Cristiane Q
authors.initials: CQ
authors.lastname: Snoeijer
authors.forename: Leonardo B
authors.initials: LB
authors.lastname: Koerich
authors.forename: Maísa M
authors.initials: MM
authors.lastname: Sperandio
authors.forename: Ethel
authors.initials: E
authors.lastname: Bayer-Santos
authors.forename: Stenio P
authors.initials: SP
authors.lastname: Fragoso
authors.forename: Samuel
authors.initials: S
authors.lastname: Goldenberg
authors.forename: Omar
authors.initials: O
authors.lastname: Triana
authors.forename: Gustavo A
authors.initials: GA
authors.lastname: Vallejo
authors.forename: Kevin M
authors.initials: KM
authors.lastname: Tyler
authors.forename: Alberto M R
authors.initials: AM
authors.lastname: Dávila
authors.forename: Mário
authors.initials: M
authors.lastname: Steindel
mesh_terms: D004251:DNA Transposable Elements; D004272:DNA, Mitochondrial / Q000235:genetics; D030541:Databases, Genetic; D030561:Databases, Nucleic Acid; D020224:Expressed Sequence Tags; D020869:Gene Expression Profiling; D016366:Open Reading Frames; D015800:Protozoan Proteins / Q000235:genetics; D017422:Sequence Analysis, DNA; D014345:Trypanosoma / Q000235:genetics*; D037521:Virulence Factors / Q000235:genetics
chemical_list: D004251:DNA Transposable Elements; D004272:DNA, Mitochondrial; D015800:Protozoan Proteins; D037521:Virulence Factors