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Mem. Inst. Oswaldo Cruz ; 102(7): 879-882, Nov. 2007. ilus, tab
Artigo em Inglês | LILACS | ID: lil-470351

RESUMO

Nuclear internal transcribed spacer 2 (ITS2) rDNA sequences were used for a molecular phylogenetics analysis of five Onchocerca species. The sister species of the human parasite O. volvulus was found to be the cattle parasite O. ochengi and not O. gibsoni, contrary to chromosomal evidence. The genetic differentiation of two African populations (representing the two African strains) and a Brazilian population of O. volvulus was also studied. Phylogenetic and network reconstruction did not show any clustering of ITS2 alleles on geographic or strain grounds. Furthermore, population genetics tests showed no indication of population differentiation but suggested gene flow among the three populations.


Assuntos
Animais , Bovinos , Humanos , DNA de Helmintos/genética , DNA Espaçador Ribossômico/genética , Variação Genética , Onchocerca volvulus/genética , Transcrição Gênica/genética , Sequência de Bases , Dados de Sequência Molecular , Filogenia
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