| Journal: | Memorias do Instituto Oswaldo Cruz |
| Database: | PERIÓDICA |
| System number: | 000372722 |
| ISSN: | 0074-0276 |
| Authors: | Pita, Sebastián1 Panzera, Francisco1 Ferrandis, Inés1 Galvao, Cleber2 Gómez Palacio, Andrés3 Panzera, Yanina1 |
| Institutions: | 1Universidad de la República, Facultad de Ciencias, Montevideo. Uruguay 2Instituto Oswaldo Cruz, Laboratorio Nacional e Internacional de Referencia em Taxonomia de Triatomineos, Rio de Janeiro. Brasil 3Universidad de Antioquia, Instituto de Biología, Medellín, Antioquia. Brasil |
| Year: | 2013 |
| Season: | May |
| Volumen: | 108 |
| Number: | 3 |
| Pages: | 376-382 |
| Country: | Brasil |
| Language: | Inglés |
| Document type: | Artículo |
| Approach: | Experimental, aplicado |
| English abstract | In this study, we used fluorescence in situ hybridisation to determine the chromosomal location of 45S rDNA clusters in 10 species of the tribe Rhodniini (Hemiptera: Reduviidae: Triatominae). The results showed striking inter and intraspecific variability, with the location of the rDNA clusters restricted to sex chromosomes with two patterns: either on one (X chromosome) or both sex chromosomes (X and Y chromosomes). This variation occurs within a genus that has an unchanging diploid chromosome number (2n = 22, including 20 autosomes and 2 sex chromosomes) and a similar chromosome size and genomic DNA content, reflecting a genome dynamic not revealed by these chromosome traits. The rDNA variation in closely related species and the intraspecific polymorphism in Rhodnius ecuadoriensis suggested that the chromosomal position of rDNA clusters might be a useful marker to identify recently diverged species or populations. We discuss the ancestral position of ribosomal genes in the tribe Rhodniini and the possible mechanisms involved in the variation of the rDNA clusters, including the loss of rDNA loci on the Y chromosome, transposition and ectopic pairing. The last two processes involve chromosomal exchanges between both sex chromosomes, in contrast to the widely accepted idea that the achiasmatic sex chromosomes of Heteroptera do not interchange sequences |
| Disciplines: | Biología |
| Keyword: | Genética, Insectos, Divergencia genética, Evolución cromosómica, Vectores biológicos, Enfermedad de Chagas, Cromosomas holocéntricos, Triatominae, ADN ribosomal |
| Keyword: | Biology, Genetics, Insects, Genetic diversity, Chromosome evolution, Biological vectors, Chagas disease, Holocentric chromosomes, Ribosomal DNA, Triatominae |
| Full text: | Texto completo (Ver HTML) |
