title: Characterization of Chilean, Bolivian, and Argentinian Trypanosoma cruzi populations by restriction endonuclease and isoenzyme analysis.
abstract: Ninety-one Chilean, 15 Bolivian, and 9 Argentinian Trypanosoma cruzi stocks, isolated from various hosts and vectors, were characterized by schizodeme analysis with EcoRI and MspI endonucleases. The three major similar pattern groups that emerged from this sample correlated with results of isoenzyme analysis. This result confirms previous work and supports the hypothesis of the clonal structure of natural populations of T. cruzi, fully defined at the level of isoenzyme analysis, quantitative kinetoplast DNA restriction fragment length polymorphism, and kinetoplast DNA hybridization analysis. In Chile, sylvatic and domestic cycles of T. cruzi transmission appear to be mainly independent: genetically different families of natural clones are specific to these cycles. Nevertheless, the possibility of overlap remains unclear. Results described here indicate that natural clones inhabiting Chilean regions appear genetically related to the natural clones identified in neighboring countries. In Chile the more frequently sampled parasite types are natural clone 39 and a genetically closely related clone NP13. In this work an evaluation of T. cruzi natural clone mixtures in T. cruzi stocks from Chile was performed for the first time by schizodeme analysis before and after serial transfer in mouse maintenance. The results indicate that six of nine stocks are composed of two or more natural clones. This observation raises the relevant question of whether specific T. cruzi natural clones generate different clinical features of Chagas' disease.
authors.affiliation: Departamento de Bioquímica, Facultad de Medicina, Universidad de Chile, Santiago.
authors.forename: A
authors.initials: A
authors.lastname: Solari
authors.forename: S
authors.initials: S
authors.lastname: Muñoz
authors.forename: J
authors.initials: J
authors.lastname: Venegas
authors.forename: A
authors.initials: A
authors.lastname: Wallace
authors.forename: X
authors.initials: X
authors.lastname: Aguilera
authors.forename: W
authors.initials: W
authors.lastname: Apt
authors.forename: S F
authors.initials: SF
authors.lastname: Brenière
authors.forename: M
authors.initials: M
authors.lastname: Tibayrenc
mesh_terms: D000818:Animals; D001118:Argentina; D001838:Bolivia; D014355:Chagas Disease / Q000469:parasitology*; D002677:Chile; D004270:DNA, Circular / Q000235:genetics*; D018105:DNA, Kinetoplast; D016054:DNA, Protozoan / Q000235:genetics*; D015246:Deoxyribonuclease EcoRI; D019003:Deoxyribonuclease HpaII; D015252:Deoxyribonucleases, Type II Site-Specific; D005956:Glucose-6-Phosphate Isomerase / Q000032:analysis; D006801:Humans; D007527:Isoenzymes / Q000032:analysis*; D010733:Phosphoglucomutase / Q000032:analysis; D012150:Polymorphism, Restriction Fragment Length; D014349:Trypanosoma cruzi / Q000145:classification* / Q000201:enzymology / Q000235:genetics
chemical_list: D004270:DNA, Circular; D018105:DNA, Kinetoplast; D016054:DNA, Protozoan; D007527:Isoenzymes; D015246:Deoxyribonuclease EcoRI; D019003:Deoxyribonuclease HpaII; D015252:Deoxyribonucleases, Type II Site-Specific; D005956:Glucose-6-Phosphate Isomerase; D010733:Phosphoglucomutase