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Mem. Inst. Oswaldo Cruz ; 101(6): 585-590, Sept. 2006. ilus, tab
Article Dans Anglais | LILACS | ID: lil-437049

Résumé

In this study, three strains of Trypanosoma cruzi were isolated at the same time and in the same endemic region in Mexico from a human patient with chronic chagasic cardiomyopathy (RyC-H); vector (Triatoma barberi) (RyC-V); and rodent reservoir (Peromyscus peromyscus) (RyC-R). The three strains were characterized by multilocus enzyme electrophoresis, random amplified polymorphic DNA, and by pathological profiles in experimental animals (biodemes). Based on the analysis of genetic markers the three parasite strains were typed as belonging to T. cruzi I major group, discrete typing unit 1. The pathological profile of RyC-H and RyC-V strains indicated medium virulence and low mortality and, accordingly, the strains should be considered as belonging to biodeme Type III. On the other hand, the parasites from RyC-R strain induced more severe inflammatory processes and high mortality (> 40 percent) and were considered as belonging to biodeme Type II. The relationship between genotypes and biological characteristics in T. cruzi strains is still debated and not clearly understood. An expert committee recommended in 1999 that Biodeme Type III would correspond to T. cruzi I group, whereas Biodeme Type II, to T. cruzi II group. Our findings suggest that, at least for Mexican isolates, this correlation does not stand and that biological characteristics such as pathogenicity and virulence could be determined by factors different from those identified in the genotypic characterization


Sujets)
Animaux , Femelle , Humains , Souris , Maladie de Chagas/parasitologie , Variation génétique , Parasitémie/parasitologie , Trypanosoma cruzi/génétique , Maladie de Chagas/anatomopathologie , Modèles animaux de maladie humaine , Électrophorèse sur gel d'agar , Génotype , Mexique , Souris de lignée BALB C , Peromyscus , Parasitémie/anatomopathologie , Technique RAPD , Triatoma , Trypanosoma cruzi/isolement et purification , Trypanosoma cruzi/pathogénicité , Virulence
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