INVESTIGADORES
PEREZ DE ROSAS Alicia Raquel
artículos
Título:
Molecular phylogeography of the Chagas disease vector Triatoma infestans in Argentina
Autor/es:
ALICIA R. PÉREZ DE ROSAS; ELSA L. SEGURA; BEATRIZ A. GARCÍA
Revista:
HEREDITY
Editorial:
NATURE PUBLISHING GROUP
Referencias:
Año: 2011 p. 71 - 79
ISSN:
0018-067X
Resumen:
Triatoma infestans is the main vector of Chagas disease in
South America between latitudes 101S and 461S. A multilocus microsatellite data set of 836 individuals from 27
populations of T. infestans, from all its range of distribution in
Argentina, was analyzed. Our results favor the hypothesis of
two independent migration events of colonization in Argentina and secondary contacts. The majority of the populations
of the western provinces of Catamarca, La Rioja, San Juan
and the west of Cordoba province, had almost no shared
ancestry with the rest of the populations analyzed. Probably
those populations, belonging to localities close to the Andean
region, could have been established by the dispersal line of
T. infestans that would have arrived to Argentina through the
Andes, whereas most of the rest of the populations analyzed
may have derived from the dispersal line of T. infestans in
non-Andean lowlands. Among them, those from the provinces of Formosa, Chaco, Santiago del Estero and Santa Fe shared different percentages of ancestry and presented lower degree of genetic differentiation. The migratory movement linked to regional economies and possibly associated
with passive dispersal, would allow a higher genetic exchange among these populations of T. infestans. This study, using microsatellite markers, provides a new approach for evaluating the validity of the different hypotheses concerning the evolutionary history of this species. Two major lineages of T. infestans, an Andean and non-Andean, are suggested.
