Genetic Variability and Geographic Differentiation among Three Species of Triatomine Bugs (Hemiptera-Reduviidae)

Francisco PanzeraSeccion Genetica Evolutiva, Facultad de Ciencias, Universidad de la Republica, Catedra de Genetica, Facultad de Agronomia, Departamento de Genetica, Facultad de Medicina, Centro de Referencia de Vectores, Servicio Nacional de Chagas, Centro de Pesquisas Renee Rachou, FIOCRUZ, Belo Horizonte, Instituto Boliviano de Biologia de Altura, Montevideo, Uruguay

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Sonia HornosSeccion Genetica Evolutiva, Facultad de Ciencias, Universidad de la Republica, Catedra de Genetica, Facultad de Agronomia, Departamento de Genetica, Facultad de Medicina, Centro de Referencia de Vectores, Servicio Nacional de Chagas, Centro de Pesquisas Renee Rachou, FIOCRUZ, Belo Horizonte, Instituto Boliviano de Biologia de Altura, Montevideo, Uruguay

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Jorge PereiraSeccion Genetica Evolutiva, Facultad de Ciencias, Universidad de la Republica, Catedra de Genetica, Facultad de Agronomia, Departamento de Genetica, Facultad de Medicina, Centro de Referencia de Vectores, Servicio Nacional de Chagas, Centro de Pesquisas Renee Rachou, FIOCRUZ, Belo Horizonte, Instituto Boliviano de Biologia de Altura, Montevideo, Uruguay

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Rosario CestauSeccion Genetica Evolutiva, Facultad de Ciencias, Universidad de la Republica, Catedra de Genetica, Facultad de Agronomia, Departamento de Genetica, Facultad de Medicina, Centro de Referencia de Vectores, Servicio Nacional de Chagas, Centro de Pesquisas Renee Rachou, FIOCRUZ, Belo Horizonte, Instituto Boliviano de Biologia de Altura, Montevideo, Uruguay

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Delmi CanaleSeccion Genetica Evolutiva, Facultad de Ciencias, Universidad de la Republica, Catedra de Genetica, Facultad de Agronomia, Departamento de Genetica, Facultad de Medicina, Centro de Referencia de Vectores, Servicio Nacional de Chagas, Centro de Pesquisas Renee Rachou, FIOCRUZ, Belo Horizonte, Instituto Boliviano de Biologia de Altura, Montevideo, Uruguay

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Lileia DiotaiutiSeccion Genetica Evolutiva, Facultad de Ciencias, Universidad de la Republica, Catedra de Genetica, Facultad de Agronomia, Departamento de Genetica, Facultad de Medicina, Centro de Referencia de Vectores, Servicio Nacional de Chagas, Centro de Pesquisas Renee Rachou, FIOCRUZ, Belo Horizonte, Instituto Boliviano de Biologia de Altura, Montevideo, Uruguay

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Jean Pierre DujardinSeccion Genetica Evolutiva, Facultad de Ciencias, Universidad de la Republica, Catedra de Genetica, Facultad de Agronomia, Departamento de Genetica, Facultad de Medicina, Centro de Referencia de Vectores, Servicio Nacional de Chagas, Centro de Pesquisas Renee Rachou, FIOCRUZ, Belo Horizonte, Instituto Boliviano de Biologia de Altura, Montevideo, Uruguay

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Ruben PerezSeccion Genetica Evolutiva, Facultad de Ciencias, Universidad de la Republica, Catedra de Genetica, Facultad de Agronomia, Departamento de Genetica, Facultad de Medicina, Centro de Referencia de Vectores, Servicio Nacional de Chagas, Centro de Pesquisas Renee Rachou, FIOCRUZ, Belo Horizonte, Instituto Boliviano de Biologia de Altura, Montevideo, Uruguay

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Three species of triatomine bugs, Triatoma sordida, T. guasayana, and T. patagonica, were examined by cytogenetic (C-banded karyotypes and male meiotic process) and isoenzymatic studies. These three species, with different importance as Chagas' disease vectors, were found to be closely related according to their known ethologic, ecologic, and morphologic traits. Although they have the same diploid chromosome number (2n = 22 constituted by 20 autosomes and an XY♂/XX♀ sex mechanism), each species has a distinct chromosomal behavior during male meiosis and a specific amount and localization of C-heterochromatic blocks. Moreover, these chromosome characteristics allowed us to differentiate two T. sordida populations. Isoenzymatic data confirmed the taxonomic status of the three species and together with our cytogenetic results questioned the species homogeneity of T. sordida.

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