High genetic diversity in field isolates of Trypanosoma theileri assessed by analysis of cathepsin L-like sequences disclosed multiple and new genotypes infecting cattle in Thailand
| Contribuinte(s) |
UNIVERSIDADE DE SÃO PAULO |
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| Data(s) |
20/10/2012
20/10/2012
2011
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| Resumo |
In this study, we describe the first survey in Thailand of Trypanosoma theileri, a widespread and prevalent parasite of cattle that is transmitted by tabanid flies. Investigation of 210 bovine blood samples of Thai cattle from six farms by hematocrit centrifuge technique (HCT) revealed 14 samples with trypanosomes morphologically compatible to T. theileri. Additional animals were positive for T. theileri by PCR based on the Cathepsin L-like sequence (TthCATL-PCR) despite negative by HCT, indicating cryptic infections. Results revealed a prevalence of 26 +/- 15% (95% CI) of T. theileri infection. Additionally, 12 samples positive for T. theileri were detected in cattle from other 11 farms. From a total of 30 blood samples positive by HCT and/or PCR from 17 farms, seven were characterized to evaluate the genetic polymorphism of T. theileri through sequence analysis of PCR-amplified CATL DNA sequences. All CATL sequences of T. theileri from Thai cattle clustered with sequences of the previously described phylogenetic lineages TthI and TthII, supporting only two major lineages of T. theileri in cattle around the world. However, 11 of the 29 CATL sequences analyzed showed to be different, disclosing an unexpectedly large polymorphic genetic repertoire, with multiple genotypes of T. theileri not previously described in other countries circulating in Thai cattle. (C) 2011 Elsevier B.V. All rights reserved. Brazilian agency CNPq Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) Centre de Cooperation Internationale en Recherche Agronomique pour le Developpement (CIRAD, France) Centre de Cooperation Internationale en Recherche Agronomique pour le Developpement (CIRAD, France) Thailand International Cooperation Agency (TICA, Bangkok, Thailand) Thailand International Cooperation Agency (TICA, Bangkok, Thailand) Faculty of Veterinary Medicine, Kasetsart University (FVM/KU, Bangkok, Thailand) Faculty of Veterinary Medicine, Kasetsart University (FVM/KU, Bangkok, Thailand) CDCH-UCV in Venezuela CDCH-UCV in Venezuela |
| Identificador |
VETERINARY PARASITOLOGY, v.180, n.3/Abr, p.363-367, 2011 0304-4017 http://producao.usp.br/handle/BDPI/28491 10.1016/j.vetpar.2011.03.017 |
| Idioma(s) |
eng |
| Publicador |
ELSEVIER SCIENCE BV |
| Relação |
Veterinary Parasitology |
| Direitos |
restrictedAccess Copyright ELSEVIER SCIENCE BV |
| Palavras-Chave | #Trypanosoma theileri #Cattle trypanosome #Molecular diagnosis #Genetic diversity #Cathepsin L-like gene #Thailand #MEGATRYPANUM THEILERI #PHYLOGENETIC ANALYSIS #DAIRY-CATTLE #DIAGNOSIS #REVEALS #COW #DNA #Parasitology #Veterinary Sciences |
| Tipo |
article original article publishedVersion |
