Use este identificador para citar ou linkar para este item: http://repositorio.inpa.gov.br/handle/123/2598
Título: Karyotypic analysis of Baryancistrus aff. niveatus (Ancistrinae, Loricaryidae) by C-banding, Ag-NOR, CMA(3), DAPI anf FISH.
Autor(es): A C P Souza
Aline L Nascimento
Castro R R
Regina maria de Souza Barros
Cleusa C Y Nagamachi
Júlio César Pieczarka
Eliana Feldberg
Assunto: Amazônia
Siluriformes
Ancistrinae
ISSN: 0008-7114
Revista: Caryologia (Firenze)
Volume: 57
Resumo: Three specimes of Baryancistrus aff. Niveatus were studied cytogenetically by conventional staining, C banding, Ag-NORs, CMA 3, DAPI and FISH with human telomeric probes. The results revealed a complement con-sisting of 52 metacentric, submetacentric and subtelocentric type chromosomes. C banding showed that heterochro-matin is located at pairs 1, 3, 6, 10, 11 and 22 in different positions. NORs were located at the short arm of pair 3, coinciding with a positive C-band. This region was also marked with CMA 3, which also marked heterochromatic blocks in chromosomes 11 and 22. These regions were negatively stained by DAPI. These results revealed the pres-ence of two different types of constitutive heterochromatin, probably due to their base composition. Chromosome bearing rDNA sites presented a difference in size in the NOR regions, probably due to heterochromatin and ribos-somal cistrons amplification. The localization of telomeric sequences by FISH revealed the conservative nature of this region.
URI: http://repositorio.inpa.gov.br/handle/123/2598
ISSN: 0008-7114
Local de publicação: Itália
Aparece nas coleções:Coordenação de Biodiversidade (CBIO)

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