Browsing by Autor "Virginia De Rose"

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    Genomic Changes of Chagas Disease Vector, South America
    (Centers for Disease Control and Prevention, 2004) Francisco Panzera; Jean Dujardin; Paula Nicolini; Marı́a Noel Caraccio; Virginia De Rose; Tatiana Tellez; Hernán Bermúdez; M. Dolores Bargues; Santiago Mas‐Coma; José‐Enrique O’Connor
    We analyzed the main karyologic changes that have occurred during the dispersion of Triatoma infestans, the main vector of Chagas disease. We identified two allopatric groups, named Andean and non-Andean. The Andean specimens present C-heterochromatic blocks in most of their 22 chromosomes, whereas non-Andean specimens have only 4-7 autosomes with C-banding. These heterochromatin differences are the likely cause of a striking DNA content variation (approximately 30%) between Andean and non-Andean insects. Our study, together with previous historical and genetic data, suggests that T. infestans was originally a sylvatic species, with large quantities of DNA and heterochromatin, inhabiting the Andean region of Bolivia. However, the spread of domestic T. infestans throughout the non-Andean regions only involved insects with an important reduction of heterochromatin and DNA amounts. We propose that heterochromatin and DNA variation mainly reflected adaptive genomic changes that contribute to the ability of T. infestans to survive, reproduce, and disperse in different environments.