| Registro completo |
| Provedor de dados: |
Neotropical Ichthyology
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| País: |
Brazil
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| Título: |
Chromosome analysis in Saccodon wagneri (Characiformes) and insights into the karyotype evolution of Parodontidae
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| Autores: |
Nirchio,Mauro
Masache,Maria Cecilia
Paim,Fabilene Gomes
Cioffi,Marcelo de Bello
Moreira Filho,Orlando
Barriga,Ramiro
Oliveira,Claudio
Rossi,Anna Rita
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| Data: |
2021-01-01
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| Ano: |
2021
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| Palavras-chave: |
Ag-NOR
Cytogenetics
FISH
Heterochromatin
ZW sex chromosomes
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| Resumo: |
ABSTRACT Parodontidae is a relatively small group of Neotropical characiform fishes consisting of three genera (Apareiodon, Parodon, and Saccodon) with 32 valid species. A vast cytogenetic literature is available on Apareiodon and Parodon, but to date, there is no cytogenetic data about Saccodon, a genus that contains only three species with a trans-Andean distribution. In the present study the karyotype of S. wagneri was described, based on both conventional (Giemsa staining, Ag-NOR, C-bands) and molecular (repetitive DNA mapping by fluorescent in situ hybridization) methods. A diploid chromosome number of 2n = 54 was observed in both sexes, and the presence of heteromorphic sex chromosomes of the ZZ/ZW type was detected. The W chromosome has a terminal heterochromatin band that occupies approximately half of the long arm, being this band approximately half the size of the Z chromosome. The FISH assay showed a synteny of the 18S-rDNA and 5S-rDNA genes in the chromosome pair 14, and the absence of interstitial telomeric sites. Our data reinforce the hypothesis of a conservative karyotype structure in Parodontidae and suggest an ancient origin of the sex chromosomes in the fishes of this family.
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| Tipo: |
Info:eu-repo/semantics/article
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| Idioma: |
Inglês
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| Identificador: |
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252021000100203
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| Editor: |
Sociedade Brasileira de Ictiologia
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| Relação: |
10.1590/1982-0224-2020-0103
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| Formato: |
text/html
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| Fonte: |
Neotropical Ichthyology v.19 n.1 2021
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| Direitos: |
info:eu-repo/semantics/openAccess
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