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Volume 10, Number 3—March 2004

Research

Genomic Changes of Chagas Disease Vector, South America

Francisco Panzera*Comments to Author , Jean Pierre Dujardin†, Paula Nicolini*, María Noel Caraccio*, Virginia Rose*, Tatiana Tellez‡, Hernán Bermúdez‡, María Dolores Bargues§, Santiago Mas-Coma§, José Enrique O’Connor§, and Ruben Pérez*
Author affiliations: *Universidad Mayor de la República, Montevideo, Uruguay; †Institut de Recherche pour le Développement, Montpellier, France; ‡Universidad Mayor de San Simón, Cochabamba, Bolivia; §Universidad de Valencia, Valencia, Spain

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Figure 4

Meiotic pairing in the experimental male hybrid progeny between Andean and non-Andean specimens of Triatoma infestans. Scale bar = 10 μm. A: First meiotic metaphase in an insect obtained by crossing a female from Andean region (with C-banded X chromosomes) with a male from non-Andean region. As expected, both sex chromosomes are heterochromatic. As observed in normal specimens, the ten bivalents form a ring with the univalent sex chromosomes in the middle. Chromosome pairing was normal even betw

Figure 4. Meiotic pairing in the experimental male hybrid progeny between Andean and non-Andean specimens of Triatoma infestans. Scale bar = 10 μm. A: First meiotic metaphase in an insect obtained by crossing a female from Andean region (with C-banded X chromosomes) with a male from non-Andean region. As expected, both sex chromosomes are heterochromatic. As observed in normal specimens, the ten bivalents form a ring with the univalent sex chromosomes in the middle. Chromosome pairing was normal even between chromosomes with great heterochromatic differences. B: Selected bivalent with a diagram of its mitotic and meiotic configuration. As generally observed in hemipteran insects, only a single chiasma is represented. Chromosomes involved in the pairing have different C-patterns: one has C-bands in both chromosomal ends (B-morph); the other one is completely euchromatic (C-morph); the resulting bivalent is asymmetric. C: Selected bivalent with a diagram of its mitotic and meiotic configuration. Chromosomes involved have different C-patterns: one has C-bands in only one chromosomal end (A-morph) while the other one is completely euchromatic (C-morph); the resulting bivalent is also asymmetric. D: First meiotic metaphase in an insect obtained by crossing a female from non-Andean region (with euchromatic X chromosomes) with a male from Andean region. As expected, the X chromosome appears euchromatic in the hybrid. Chromosome pairing was completely normal even between chromosomes with great heterochromatic differences.

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