Cytogenetic Analysis of Experimental Hybrids in Species of Triatominae (Hemiptera-Reduviidae) |
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Authors: | Ruben Pérez Martín Hernández Om Quintero Ekaterina Scvortzoff Delmi Canale Leticia Méndez Claudia Cohanoff Mariana Martino Francisco Panzera |
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Institution: | (1) Sección Genética Evolutiva, Instituto de Biología, Facultad de Ciencias, Universidad de la República, Iguá 4225, 11400 Montevideo, Uruguay;(2) Servicio Nacional de Chagas, 9 de Julio 356, 5000 Córdoba, Argentina |
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Abstract: | A cytogenetic analysis was performed in experimental hybrids between species of Chagas disease transmitting bugs with remarkable
differences in the amount and distribution of heterochromatin. Using C-banding technique, we identified the parental species
chromosomes and analysed the meiotic behaviour in the male hybrids between Triatoma platensis and T. infestans, T. platensis and T. delpontei, and T. infestans and T. rubrovaria. The two former hybrids have an entirely normal meiotic behaviour despite the extensive differences in C-banded karyotypes
observed in the parental species, indicating that heterochromatin differences between homeologous chromosomes are not a barrier
that influences meiotic synapsis and recombination. On the contrary, the experimental hybrids between T. infestans and T. rubrovaria show failures in pairing of homeologous chromosomes that lead to the production of abnormal spermatids and hybrid sterility.
Our data suggest that karyotypic repatterning within triatomines has involved at least two different pathways. Among closely
related species, chromosomal changes have largely involved addition or deletion of heterochromatic regions. In more distant
species, chromosomal rearrangements (i.e. inversions and translocations) have also arisen. Hybridisation data also allow to
hypothesize about the origin and divergence of this taxonomic group, as well as the mechanisms that maintain species isolation. |
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Keywords: | heterochromatin Heteroptera holocentric meiosis Triatominae |
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