Chromosomal Instability and Origin of B Chromosomes in the Amazonian Glass Tetra Moenkhausia oligolepis (Günther, 1864) (Characiformes, Characidae)

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Autor(es): dc.contributorUniversidade Federal de Uberlândia (UFU)-
Autor(es): dc.contributorState University of Ponta Grossa-
Autor(es): dc.contributorFederal Rural University of Rio de Janeiro-
Autor(es): dc.contributorUniversidade Estadual Paulista (UNESP)-
Autor(es): dc.creatorDos Santos, Luana Pereira-
Autor(es): dc.creatorFrancisco, Carine M.-
Autor(es): dc.creatorCampos Júnior, Edimar O.-
Autor(es): dc.creatorCastro, Jonathan P.-
Autor(es): dc.creatorUtsunomia, Ricardo-
Autor(es): dc.creatorMorelli, Sandra-
Autor(es): dc.creatorPorto-Foresti, Fábio-
Autor(es): dc.creatorForesti, Fausto-
Autor(es): dc.creatorArtoni, Roberto F.-
Data de aceite: dc.date.accessioned2025-08-21T22:42:45Z-
Data de disponibilização: dc.date.available2025-08-21T22:42:45Z-
Data de envio: dc.date.issued2022-05-01-
Data de envio: dc.date.issued2022-05-01-
Data de envio: dc.date.issued2021-09-01-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.1159/000517091-
Fonte completa do material: dc.identifierhttp://hdl.handle.net/11449/233505-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/233505-
Descrição: dc.descriptionB chromosomes occur in different species of the small characid fishes of the genus Moenkhausia. These supernumerary elements, that do not recombine with chromosomes of the standard A complement and follow their own evolutionary mechanism vary in number, morphology, and distribution. Here, we show karyotypic data of individuals of 2 populations of Moenkhausia oligolepis of the Brazilian Amazon (Pedro Correia and Taboquinha streams, Tocantins river basin), both with a diploid number of 50 chromosomes and karyotypic formula of 10m + 32sm + 8a. In addition to the normal complement, we also observed the occurrence of B chromosomes in the 2 populations with intra- A nd interindividual variation ranging from 0 to 10 Bs, independent of sex. The C-banding pattern evidenced heterochromatic blocks located mainly in the pericentromeric region of the chromosomes, while the B chromosomes appeared euchromatic. Silver-stained nucleolus organizer regions were identified in multiples sites, and some of these blocks were positive when stained with chromomycin A<sub>3.</sub> The karyotype analysis and the application of whole-chromosome painting in populations of M. oligolepis reinforce the conservation of the basal diploid number for the genus, as well as the evolutionary tendency in these fishes to carry B chromosomes. Both populations turned out to be in different stages of stability and expansion of their B chromosomes. We further suggest that the origin of these chromosomes is due to the formation of isochromosomes. Here, we identified a pair of complement A chromosomes involved in this process.-
Descrição: dc.descriptionInstitute of Genetics and Biochemistry Federal University of Uberlândia-
Descrição: dc.descriptionPost-Graduate Program in Evolutionary Biology Department of Structural Molecular and Genetic Biology State University of Ponta Grossa-
Descrição: dc.descriptionDepartment of Genetics Institute of Biological and Health Sciences ICBS Federal Rural University of Rio de Janeiro-
Descrição: dc.descriptionDepartment of Biological Sciences Faculty of Sciences Paulista State University (UNESP)-
Descrição: dc.descriptionDepartment of Structural and Functional Biology Botucatu Biosciences Institute Paulista State University (UNESP)-
Descrição: dc.descriptionDepartment of Biological Sciences Faculty of Sciences Paulista State University (UNESP)-
Descrição: dc.descriptionDepartment of Structural and Functional Biology Botucatu Biosciences Institute Paulista State University (UNESP)-
Formato: dc.format249-256-
Idioma: dc.languageen-
Relação: dc.relationCytogenetic and Genome Research-
???dc.source???: dc.sourceScopus-
Palavras-chave: dc.subjectB chromosome-
Palavras-chave: dc.subjectChromosome painting-
Palavras-chave: dc.subjectHeterochromatin-
Palavras-chave: dc.subjectrDNA-
Palavras-chave: dc.subjectTetra fish-
Título: dc.titleChromosomal Instability and Origin of B Chromosomes in the Amazonian Glass Tetra Moenkhausia oligolepis (Günther, 1864) (Characiformes, Characidae)-
Tipo de arquivo: dc.typelivro digital-
Aparece nas coleções:Repositório Institucional - Unesp

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