Evolutionary history of trypanosomes from South American caiman (Caiman yacare) and African crocodiles inferred by phylogenetic analyses using SSU rDNA and gGAPDH genes
Contribuinte(s) |
UNIVERSIDADE DE SÃO PAULO |
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Data(s) |
20/10/2012
20/10/2012
2009
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Resumo |
In this study, using a combined data set of SSU rDNA and gGAPDH gene sequences, we provide phylogenetic evidence that supports Clustering of crocodilian trypanosomes from the Brazilian Caiman yacare (Alligatoridae) and Trypanosoma grayi, a species that Circulates between African crocodiles (Crocodilydae) and tsetse flies. In a survey of trypanosomes in Caiman yacare from the Brazilian Pantanal, the prevalence of trypanosome infection was 35% as determined by microhaematocrit and haemoculture, and 9 cultures were obtained. The morphology of trypomastigotes from caiman blood and tissue imprints was compared with those described for other crocodilian trypanosomes. Differences in morphology and growth behaviour of caiman trypanosomes were corroborated by molecular polymorphism that revealed 2 genotypes. Eight isolates were ascribed to genotype Cay01 and 1 to genotype Cay02. Phylogenetic inferences based on concatenated SSU rDNA and gGAPDII sequences showed that caiman isolates are closely related to T. grayi, constituting a well-supported monophyletic assemblage (clade T. grayi). Divergence time estimates based on clade composition, and biogeographical and geological events were used to discuss the relationships between the evolutionary histories of crocodilian trypanosomes and their hosts. Brazilian agency CNPq Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) CNPq Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) |
Identificador |
PARASITOLOGY, v.136, n.1, p.55-65, 2009 0031-1820 http://producao.usp.br/handle/BDPI/28592 10.1017/S003118200800512X |
Idioma(s) |
eng |
Publicador |
CAMBRIDGE UNIV PRESS |
Relação |
Parasitology |
Direitos |
restrictedAccess Copyright CAMBRIDGE UNIV PRESS |
Palavras-Chave | #Trypanosoma #evolution #phylogeny #Caiman yacare #phylogeography #ribosomal gene #gGAPDH gene #T. grayi #avain trypanosomes #SUBUNIT RIBOSOMAL-RNA #MOLECULAR EVOLUTION #AVIAN TRYPANOSOMES #HOST-SPECIFICITY #BURMESE AMBER #SEQUENCES #DIVERGENCE #DIVERSITY #PARASITES #LINEAGES #Parasitology |
Tipo |
article original article publishedVersion |