Comparative Chromosome Mapping of U2 snRNA and 5S rRNA Genes in Gymnotus Species (Gymnotiformes, Gymnotidae): Evolutionary Dynamics and Sex Chromosome Linkage in G. pantanal

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Utsunomia, Ricardo [UNESP]
Scacchetti, Priscilla C. [UNESP]
Pansonato-Alves, Jose C. [UNESP]
Oliveira, Claudio [UNESP]
Foresti, Fausto [UNESP]

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A comparative mapping of U2 small nuclear RNA (snRNA) and 5S ribosomal RNA (rRNA) genes was performed in 6 Gymnotus species. All species analyzed presented the U2 snDNA organized in conspicuous blocks and not co-located with rRNA genes. In addition, 5 species showed the U2 snDNA located in a single pair of chromosomes, which seems to be a conserved trait in this genus. Conversely, G. pantanal was the only species displaying several terminal signals in different chromosome pairs, including the X 1 sex chromosome but not the Y chromosome. This is the first report of U2 snRNA genes in sex chromosomes of fishes. The absence of sites in the Y chromosome of G. pantanal indicates a possible loss of terminal segments of the chromosomes involved in the Y formation. (C) 2014 S. Karger AG, Basel



FISH, Molecular cytogenetics, Multigene family, Sex chromosomes, Teleostei

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Cytogenetic And Genome Research. Basel: Karger, v. 142, n. 4, p. 286-292, 2014.