Use este identificador para citar ou linkar para este item:
https://locus.ufv.br//handle/123456789/23193
Tipo: | Artigo |
Título: | Astyanax bockmanni Vari and Castro, 2007: an ambiguous karyotype in the Astyanax genus |
Autor(es): | Pazza, Rubens Kavalco, Karine Frehner Almeida-Toledo, Lurdes Foresti de |
Abstract: | Despite the widespread distribution of Astyanax bockmanni in streams from Upper Paraná River system in central, southeastern, and southern Brazil, just recently, it has been identified as a distinct Astyanax species. Cytogenetic studies were performed in two populations of this species, revealing conservative features. A. bockmanni shows 2n = 50 chromosomes, a karyotypic formula composed of 10 M + 12SM + 12ST + 16A and multiple Ag-NORs. Eight positive signals in subtelocentric/acrocentric chromosomes were identified by fluorescent in situ hybridization (FISH) with 18S rDNA probes. After FISH with 5S rDNA probes, four sites were detected, comprising the interstitial region of a metacentric pair and the terminal region on long arms of another metracentric pair. Little amounts of constitutive heterochromatin were observed, mainly distributed at distal region in two chromosomal pairs. Additionally, heterochromatin was also located close to the centromeres in some chromosomes. No positive signals were detected in the chromosomes of A. bockmanni by FISH with the As-51 satellite DNA probe. The studied species combines a set of characteristics previously identified in two different Astyanax groups. The chromosomal evolution in the genus Astyanax is discussed. |
Palavras-chave: | Astyanax bockmanni Molecular cytogenetics FISH Karyotypical evolution |
Editor: | Genetica |
Tipo de Acesso: | Springer Science+Business Media B.V. 2008 |
URI: | https://doi.org/10.1007/s10709-008-9325-z http://www.locus.ufv.br/handle/123456789/23193 |
Data do documento: | Mai-2009 |
Aparece nas coleções: | Artigos |
Arquivos associados a este item:
Arquivo | Descrição | Tamanho | Formato | |
---|---|---|---|---|
artigo.pdf Until 2100-12-31 | Texto completo | 238,4 kB | Adobe PDF | Visualizar/Abrir ACESSO RESTRITO |
Os itens no repositório estão protegidos por copyright, com todos os direitos reservados, salvo quando é indicado o contrário.