Please use this identifier to cite or link to this item: https://repositorio.inpa.gov.br/handle/1/16309
Title: Intriguing evidence of translocations in Discus fish (Symphysodon, Cichlidae) and a report of the largest meiotic chromosomal chain observed in vertebrates
Authors: Gross, Maria Claudia
Feldberg, Eliana
Cella, Doralice Maria
Schneider, Marielle Cristina
Schneider, Carlos Henrique
Porto, Jorge Ivan Rebelo
Martins, Cesar Henrique Rossinoli
Keywords: Chromosome
Cichlid
Complexity
Cytogenetics
Endemic Species
Karyology
Ornamental Species
Translocation
Animals
Biological Model
Chromosome
Cichlid
Female
Gene Translocation
Genetics
Male
Meiosis
Evolution, Molecular
Vertebrate
Animal
Chromosomes
Cichlids
Evolution, Molecular
Female
Male
Meiosis
Models, Genetic
Translocation, Genetic
Vertebrates
Amazon Basin
South America
Cichlidae
Pisces
Symphysodon
Symphysodon Aequifasciata
Symphysodon Discus
Vertebrata
Issue Date: 2009
metadata.dc.publisher.journal: Heredity
metadata.dc.relation.ispartof: Volume 102, Número 5, Pags. 435-441
Abstract: As part of a program to understand the genetics of Amazonian ornamental fish, classical cytogenetics was used to analyze Symphysodon aequifasciatus, S. discus and S. haraldi, popular and expensive aquarium fishes that are endemic to the Amazon basin. Mitotic analyses in Symphysodon have shown some odd patterns compared with other Neotropical cichlids. We have confirmed that Symphysodon species are characterized by chromosomal diversity and meiotic complexity despite the fact that species share the same diploid number 2n=60. An intriguing meiotic chromosomal chain, with up to 20 elements during diplotene/diakinesis, was observed in S. aequifasciatus and S. haraldi, whereas S. discus only contains typical bivalent chromosomes. Such chromosomal chains with a high number of elements have not been observed in any other vertebrates. We showed that the meiotic chromosomal chain was not sex related. This observation is unusual and we propose that the origin of meiotic multiples in males and females is based on a series of translocations that involved heterochromatic regions after hybridization of ancestor wild Discus species. © 2009 Macmillan Publishers Limited. All rights reserved.
metadata.dc.identifier.doi: 10.1038/hdy.2009.3
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