title: Cathepsin L-like genes of Trypanosoma vivax from Africa and South America--characterization, relationships and diagnostic implications.
abstract: We characterized sequences from genes encoding cathepsin L-like (CatL-like) cysteine proteases from African and South American isolates of Trypanosoma vivax and T. vivax-like organisms, and evaluated their suitability as genetic markers for population structure analysis and diagnosis. Phylogenetic analysis of sequences corresponding to CatL-like catalytic domains revealed substantial polymorphism, and clades of sequences (TviCatL1-9) were separated by large genetic distances. TviCatL1-4 sequences were from cattle isolates from West Africa (Nigeria and Burkina Faso) and South America (Brazil and Venezuela), which belonged to the same T. vivax genotype. T. vivax-like genotypes from East Africa showed divergent sequences, including TviCatL5-7 for isolates from Mozambique and TviCatL8-9 for an isolate from Kenya. Phylogenetic analysis of CatL-like gene data supported the relationships among trypanosome species reflected in the phylogenies based on the analysis of small subunit (SSU) of ribosomal RNA gene sequence data. The discovery of different CatL-like sequences for each genotype, defined previously by ribosomal DNA data, indicate that these sequences provide useful targets for epidemiological and population genetic studies. Regions in CatL-like sequences shared by all T. vivax genotypes but not by other trypanosomes allowed the establishment of a specific and sensitive diagnostic PCR for epidemiological studies in South America and Africa.
authors.affiliation: Department of Parasitology, University of São Paulo, Av. Prof. Lineu Prestes 1374, 05508-900 São Paulo, SP, Brazil.
authors.forename: Alane P
authors.initials: AP
authors.lastname: Cortez
authors.forename: Adriana C
authors.initials: AC
authors.lastname: Rodrigues
authors.forename: Herakles A
authors.initials: HA
authors.lastname: Garcia
authors.forename: Luis
authors.initials: L
authors.lastname: Neves
authors.forename: Jael S
authors.initials: JS
authors.lastname: Batista
authors.forename: Zacharia
authors.initials: Z
authors.lastname: Bengaly
authors.forename: Fernando
authors.initials: F
authors.lastname: Paiva
authors.forename: Marta M G
authors.initials: MM
authors.lastname: Teixeira
mesh_terms: D000349:Africa; D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D020134:Catalytic Domain / Q000235:genetics; D056668:Cathepsin L; D002403:Cathepsins / Q000737:chemistry / Q000235:genetics*; D003546:Cysteine Endopeptidases / Q000737:chemistry / Q000235:genetics*; D017125:Genes, Protozoan; D008969:Molecular Sequence Data; D010802:Phylogeny; D016133:Polymerase Chain Reaction; D011110:Polymorphism, Genetic; D012335:RNA, Ribosomal / Q000235:genetics; D013020:South America; D016689:Trypanosoma vivax / Q000201:enzymology* / Q000235:genetics* / Q000302:isolation & purification; D014353:Trypanosomiasis, African / Q000175:diagnosis* / Q000201:enzymology* / Q000235:genetics
chemical_list: D012335:RNA, Ribosomal; D002403:Cathepsins; D003546:Cysteine Endopeptidases; D056668:Cathepsin L