Localization of rDNA sites in holocentric chromosomes of three species of triatomines (Heteroptera, Triatominae)
Genet. mol. res. (Online)
;
4(4): 704-709, 2005. ilus
Article
Dans Anglais
| LILACS
| ID: lil-444854
ABSTRACT
Chromatin organization in the holocentric chromosomes of three triatomines species was cytologically studied by fluorescent in situ hybridization with a 45S rDNA probe of Drosophila melanogaster to localize ribosomal genes. In Triatoma tibiamaculata, metaphases I showed telomeric highlights in a single, larger bivalent. In T. protacta, hybridization was detected in one of the telomeres of an autosomal chromosome. In T. platensis, there were highlights in a single, smaller chromosome (X chromosome). The results obtained did not agree with the expected localization of rDNA genes in the sex chromosomes of triatomines, as demonstrated by silver impregnation, and suggest that the chromosome reorganization that occurred in this group during evolution may be a more important mechanism involved in rDNA distribution.
Texte intégral:
Disponible
Indice:
LILAS (Amériques)
Sujet Principal:
ADN ribosomique
/
Chromosomes
/
Triatominae
Limites du sujet:
Animaux
langue:
Anglais
Texte intégral:
Genet. mol. res. (Online)
Thème du journal:
Biologie moléculaire
/
Génétique
Année:
2005
Type:
Article
Pays d'affiliation:
Brésil
Institution/Pays d'affiliation:
UNESP/BR
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