Possible Common Origin of B Chromosomes in Neotropical Fish (Siluriformes, Auchenipteridae) Reinforced by Repetitive DNA Mapping
Braz. arch. biol. technol
; 64: e21190494, 2021. tab, graf
Artigo
em Inglês
| LILACS
| ID: biblio-1249202
Biblioteca responsável:
BR1.1
ABSTRACT
Abstract The aim of this paper was to present the second case of B chromosomes in Auchenipteridae (Trachelyopterus sp.), and to test the hypothesis that the B chromosomes of this species and Parauchenipterus galeatus might have a common origin, since these two species have phylogenetic proximity. Both species have 58 chromosomes in the A complement, heterochromatin preferentially located at terminal region of the most of chromosomes, simple Ag-NORs located at the short arm of a subtelocentric pair, which was confirmed by hybridization with 18S rDNA, two submetacentric pairs carrying 5S rDNA sites, and presence of B chromosomes. The B chromosomes of the two species are small, metacentric, and almost totally heterochromatic, with variation of number intra and interindividual. In addition, for the first time in fish, the telomeric sequence [TTAGGG]n was dispersed along the B chromosomes (both species). The [GATA]n microsatellite were scattered in all chromosomes of the A complement and absent in the B chromosomes, in both species. These aspects confirm the phylogenetic proximity between the genus Parauchenipterus and Trachelyopterus, and they suggest the hypothesis that the B chromosomes of the two species might have common origin, previous to the diversification of these genera.
Texto completo:
Disponível
Coleções:
Bases de dados internacionais
Base de dados:
LILACS
Assunto principal:
Peixes-Gato
/
Mapeamento Cromossômico
/
Cromossomos Humanos 4-5
Idioma:
Inglês
Revista:
Braz. arch. biol. technol
Assunto da revista:
Biologia
Ano de publicação:
2021
Tipo de documento:
Artigo
País de afiliação:
Brasil
Instituição/País de afiliação:
Federal Institute of Education, Science and Technology of Mato Grosso/BR
/
Federal Technological University of Paraná/BR
/
Federal University of Amazonas/BR
/
Federal University of Mato Grosso/BR
/
Federal University of São Carlos/BR
/
Ponta Grossa State University/BR
/
Western Paraná State University/BR