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Origin and evolution of B chromosomes in the cichlid fish Astatotilapia latifasciata based on integrated genomic analyses.
TLDR
A model in which the B chromosome originated early in the evolutionary history of Lake Victoria cichlid fish from a small fragment of one autosome is proposed, and intact B chromosome genes involved with microtubule organization, kinetochore structure, recombination and progression through the cell cycle may play a role in driving the transmission of the B chromosomes. Expand
Banding pattern of A and B chromosomes of Prochilodus lineatus (Characiformes, Prochilodontidae), with comments on B chromosomes evolution
TLDR
The present results indicate that the B chromosomes of P. lineatus should have an ancient origin, and have undergone a differential evolutionary pathway among distinct populations. Expand
Comparative cytogenetics among populations of Astyanax altiparanae (Characiformes, Characidae, Incertae sedis)
TLDR
The chromosomal data obtained in A. altiparanae support the hypothesis of diploid number conservation and the apparent karyotypical similarity among the studied populations strongly suggests a close relationship among them with some chromosomal divergences due to gene flow restriction. Expand
Astyanax aff. fasciatus Cuvier, 1819 (Teleostei; Characidae): evidences of a species complex in the upper rio Tibagi basin (Paraná, Brazil)
TLDR
The morphometric analyses of canonical variates indicate a consistent isolation of the Furna 2 sample, while the other samples seem to be superimposed, indicating a possible gene flow or even a recent isolation event in the studied region. Expand
Chromosomal diversification in ribosomal DNA sites in Ancistrus Kner, 1854 (Loricariidae, Ancistrini) from three hydrographic basins of Mato Grosso, Brazil
TLDR
The karyotype differentiation in Ancistrus species could be associated with a morphological speciation process, suggesting that chromosome fusions, inversions, deletions, duplications, and heterochromatination could contribute to the karyotypes evolution of these neotropical armored catfishes. Expand
Colocalization of repetitive DNAs and silencing of major rRNA genes. A case report of the fish Astyanax janeiroensis
TLDR
Several chromosomal and karyotype markers are similar between A. janeiroensis and A. scabripinnis, indicating a close relationship between these species. Expand
Diversification of a ZZ/ZW sex chromosome system in Characidium fish (Crenuchidae, Characiformes)
TLDR
The common origin of the sex chromosome system of ZZ/ZW type in the karyotypes of other representatives of the genus analyzed so far might be hypothesized based on biogeography and partial phylogeny of the group. Expand
Chromosomal evolution of neotropical cichlids: the role of repetitive DNA sequences in the organization and structure of karyotype
TLDR
The data demonstrated the karyotypic diversity that exists among neotropical cichlids, suggesting that most of this diversity is due to the repetitive sequences present in heterochromatic regions and that repeat sequences have greatly influenced the kARYotypic evolution of these fishes. Expand
Comparative cytogenetics among species of the Astyanax scabripinnis complex: evolutionary and biogeographical inferences
TLDR
The hypothesis is that the karyotypic form A corresponds to the species A. paranae and forms B and C correspond to other species of the A. scabripinnis complex. Expand
Differentiation of repetitive DNA sites and sex chromosome systems reveal closely related group in Parodontidae (Actinopterygii: Characiformes)
TLDR
The phylogenetic analysis corroborates the hypothesis of sex chromosome differentiation and establishes groups of closely related species and supports the presence of internal monophyletic groups within Parodontidae. Expand
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