Data/hora: 09/06/2024 11:32:08

Provedor de dados: | 74
País: | Brazil
Título: | Karyotypic differentiation through chromosome fusion and number reduction in Imparfinis hollandi (Ostariophysi, Heptapteridae)
Autores: | Margarido,Vladimir Pavan; Moreira-Filho,Orlando.
Data: | 2008-01-01
Ano: | 2008
Palavras-chave: | Siluriformes; Chromosome banding; Chromosomal rearrangements; (TTAGGG)n.
Resumo: | The Neotropical Heptapteridae fish Imparfinis hollandi, endemic to the Iguaçu River Basin (Brazil), was cytogenetically analyzed and the diploid chromosome number of 2n = 42 chromosomes was determined (22m + 10sm + 10st), the lowest diploid number in this genus and family. Like other Heptapteridae species, only one NOR-bearing chromosome pair was detected by silver nitrate staining. Dark heterochromatic blocks were visualized in only three chromosome pairs, and chromomycin A3+ bands were coincident with Ag-NORs. Although no intercalary (TTAGGG)n sequence was observed through FISH with a telomere probe, an asymmetric karyotype showing four large chromosome pairs with diploid chromosome number reduction suggests that tandem chromosome fusions probably occurred during the karyotypic differentiation of Imparfinis hollandi.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572008000200012
Editor: | Sociedade Brasileira de Genética
Relação: | 10.1590/S1415-47572008000200012
Formato: | text/html
Fonte: | Genetics and Molecular Biology  v.31 n.1 suppl.0 2008
Fonte: | info:eu-repo/semantics/openAccess