Volume 10, Number 3, March 2004

Genomic Changes of Chagas Disease Vector, South America

Francisco Panzera,* 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*
*Universidad Mayor de la República, Montevideo, Uruguay; †Institut de Recherche pour le Développement, Montpellier, France; ‡Universidad Mayor de San Simón, Cochabamba, Bolivia; and §Universidad de Valencia, Valencia, Spain

Figure 2. Representative C-banding patterns observed in male Triatoma infestans: 2n = 22 (20 autosomes plus XY in males/ XX females) coming from non-Andean (A–C) and Andean regions (D–F). Scale bar = 10 µm. A: Spermatogonial mitotic prometaphase. This specimen from Argentina presents the lowest number of C-banded autosomes (four chromosomes). B: First meiotic metaphase. Only two heterochromatic bivalents, formed by the pairing of the four C-banded autosomes showed in 2A, are observed. The Y (heterochromatic) and X (euchromatic) chromosomes appear as univalents, as typically observed in hemipteran insects. C: Karyotype obtained from 2A. Heterochromatic C-bands are clearly detected in four autosomes and in the Y sex chromosome. D: Mitotic prometaphase in male specimen from Andean Bolivia. Almost all chromosomes present C-bands in one or both chromosomal ends. E: First meiotic metaphase of the same insect shown in 2D. All bivalents except one (arrowhead) are formed by chromosome with C-bands. As observed in other hemipterans, the bivalents form a ring with the univalent sex chromosomes (X and Y) in the center. F: Karyotype obtained from 2D. Chromosome size and C-banding pattern are clearly different from those observed in 2C. Heterochromatic blocks are localized in most autosomes and in both sex chromosomes.

EID Home | Top of Page | Ahead-of-Print | Past Issues | Suggested Citation | EID Search | Contact Us | Accessibility | Privacy Policy Notice | CDC Home | CDC Search | Health Topics A-Z

This page last reviewed February 11, 2004

Emerging Infectious Diseases Journal
National Center for Infectious Diseases
Centers for Disease Control and Prevention