Data/hora: 09/06/2024 07:31:14

Provedor de dados: | 74
País: | Brazil
Título: | Karyology of the Atlantic forest rodent Juliomys (Cricetidae): a new karyotype from southern Brazil
Autores: | Paresque,Roberta; Christoff,Alexandre Uarth; Fagundes,Valéria.
Data: | 2009-01-01
Ano: | 2009
Palavras-chave: | Juliomys; Karyotype evolution; J. ossitenuis; Comparative G-banding; Ag-NORs.
Resumo: | Juliomys is a small rodent from the family Cricetidae which inhabits the Atlantic forest and forests from Argentina to eastern Brazil. The three species recognized so far have different karyotypes. In this paper, we describe a new karyotype with 2n = 32, FN = 48 found in Juliomys specimens from a high-altitude area in the Atlantic forest of southern Brazil. The karyotype was analyzed after G- and C-banding and silver staining of the nucleolus organizer regions (Ag-NOR) and its G-banding patterns were compared with those of the newly described species Juliomys ossitenuis (2n = 20, FN = 36). The 2n = 32 karyomorph presented peculiar features and was very different from those of the other species of the genus: J. pictipes (2n = 36, FN = 34), J. rimofrons (2n = 20, FN = 34) and J. ossitenuis (2n = 20, FN = 36). Differences were mostly due to centric and tandem fusions, pericentric inversion and loss of heterochromatin. The karyotype represents a powerful tool to differentiate Juliomys species and our data suggest that the karyotype described herein belongs to a new species.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572009000200016
Editor: | Sociedade Brasileira de Genética
Relação: | 10.1590/S1415-47572009005000031
Formato: | text/html
Fonte: | Genetics and Molecular Biology  v.32 n.2 2009
Fonte: | info:eu-repo/semantics/openAccess