Natural triploidy and B chromosomes in Astyanax scabripinnis (Characiformes, Characidae): a new occurrence

Autor(es)

Machado, Santos Natalia ^[1] ; Ferreira-Neto, Maressa ^[1] ; Bakkali, Mohammed ^[2] ; Vicari, Marcelo Ricardo ^[3] ; Artoni, Roberto Ferreira ^[3] ; de Oliveira, Claudio ^[1] ; Foresti, Fausto ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Paulista, Inst Biosci, Dept Morphol, BR-18618970 Botucatu, SP - Brazil

^[2] Univ Granada, Fac Ciencias, Dept Genet, E-18071 Granada - Spain

^[3] Univ Estadual Ponta Grossa, Dept Mol & Struct Biol & Genet, BR-84030900 Maringa, Parana - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Caryologia; v. 65, n. 1, p. 40-46, 2012.
• Citações Web of Science: 8

Resumo

Several cases of natural triploidy have already been described in fish, however this is the first report of a surviving triploid that also carries two different supernumerary chromosomes. Cytogenetic analysis of an Astyanax scabripinnis population revealed a standard karyotype of 2n = 50, with a chromosome formula consisting of: 6 metacentric + 16 submetacentric + 14 subtelocentric + 14 acrocentric chromosomes. In addition, specimens showed a polymorphism for the presence of up to two supernumerary chromosomes. Among the specimens analyzed one was a natural triploid (with 75 chromosomes) that also carried a small sized and a macro-supernumerary chromosome. The co-occurrence of spontaneous triploidy and two supernumerary chromosome indicates the viability of this karyotype constitution as well as this fish capacity of tolerating extra chromosomes in large numbers. (AU)

• Processo FAPESP: 08/57067-1 - Alterações cromossômicas estruturais e evolução cariotípica em Astyanax fasciatus (Teleostei, Characiformes, Characidae)
• Beneficiário: Maressa Ferreira Neto
• Modalidade de apoio: Bolsas no Brasil - Doutorado