Data/hora: 03/06/2024 04:04:16

Provedor de dados: 	74	
País: 	Brazil	
Título: 	Satellite DNA sites in four species of the genus Astyanax (Teleostei, Characiformes)	
Autores: 	Kavalco,Karine Frehner; Pazza,Rubens; Bertollo,Luiz Antonio Carlos; Moreira-Filho,Orlando.	
Data: 	2007-01-01	
Ano: 	2007	
Palavras-chave: 	Astyanax; Fluorescence in situ hybridization (FISH); Heterochromatin; Karyotypic diversity; Satellite DNA.	
Resumo: 	Cytogenetic data about satellite DNA distribution in four Astyanax species (Characidae) from the Paraitinga river, Paraíba do Sul river basin, Brazil, are presented. In order to characterize the constitutive heterochromatin, C-banding, chromomycin A3 and DAPI fluorescence staining, as well as fluorescence in situ hybridization (FISH) with the satellite DNA As-51 probe were performed. A. scabripinnis and A. parahybae presented 2n = 50 and 2n = 48 chromosomes, respectively. The heterochromatin was located in the pericentromeric and terminal regions of many chromosomes, corresponding to GC-positive regions and to the As-51 satellite DNA in terminal regions. A. intermedius and A. giton, both with 2n = 50 chromosomes, showed little heterochromatin, mostly restricted to the terminal and pericentromeric regions of a few chromosomes. No GC-positive regions, neither any correspondence between the scarce heterochromatin of these species and the As-51 satellite DNA was observed. AT-positive blocks were not detected in any of the species studied. Based on these and other available data, the hypothesis that Astyanax represents a polyphyletic group is discussed.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572007000400005	
Editor: 	Sociedade Brasileira de Genética	
Relação: 	10.1590/S1415-47572007000400005	
Formato: 	text/html	
Fonte: 	Genetics and Molecular Biology  v.30 n.3 2007	
Fonte: 	info:eu-repo/semantics/openAccess