2017
DOI: 10.1590/1982-0224-20160056
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Abstract: The genus Corydoras comprises a diversity of species with different diploid numbers. We compared cytogenetic data among Corydoras species from different rivers of the Ponta Grossa Arch region in southern Brazil. Corydoras ehrhardti and C. aff. paleatus have a similar karyotype formula and the same diploid number (2n = 44). Corydoras lacrimostigmata has a higher diploid number, with 2n = 58 chromosomes. Fluorescence in situ hybridization using 5S and 18S ribosomal DNA probes suggests that these ribosomal DNA se… Show more

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Cited by 16 publications
(9 citation statements)
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“…Recently, some studies have proposed that the dispersal of ribosomal sites and changes in their chromosomal location may affect recombination rates in these specific sites, and that these changes can lead to rapid genome divergence (Symonová et al 2013). Therefore, these populational chromosome rearrangements due to rDNA transposition could promote differentiation (Symonová et al 2013, Pucci et al 2014, Barbosa et al 2017), which may lead to speciation, as observed in the present study for Anostomidae.…”
Section: Discussionmentioning
confidence: 51%
“…Recently, some studies have proposed that the dispersal of ribosomal sites and changes in their chromosomal location may affect recombination rates in these specific sites, and that these changes can lead to rapid genome divergence (Symonová et al 2013). Therefore, these populational chromosome rearrangements due to rDNA transposition could promote differentiation (Symonová et al 2013, Pucci et al 2014, Barbosa et al 2017), which may lead to speciation, as observed in the present study for Anostomidae.…”
Section: Discussionmentioning
confidence: 51%
“…The 18S rDNA sites occupies the long arm terminal region of a single large subtelocentric chromosome pair in most species of Apareiodon (Moreira-Filho et al , 1984, 1985; Rosa et al , 2006; Vicari et al , 2006). Even though there are some few exceptions for multiple 18S rDNA sites occuring in Apareiodon (Bellafronte et al , 2009; Traldi et al , 2016), there is no case with such a high number as in Apareiodon sp., which may be related to some distinct chromosomal rearrangements, such as inversions, translocations and transposon-mediated transpositions (Symonová et al , 2013; Barbosa et al , 2017). On the other hand, the 5S rDNA localization is a conserved trait in the Parodontidae, where the chromosome pair bearing these sequences appears as homologue in most species (Bellafronte et al , 2009, 2011).…”
Section: Discussionmentioning
confidence: 99%
“…However, the effect of these mechanisms, when we compare different genomes, would be the differentiation of repetitive DNA copies, as verified for these species. Chromosome differentiation caused by the movement of repetitive sequences seems to be very important for speciation 58,[68][69][70] . Symonová et al 58 provided indirect evidence in which rDNA uses the spreading mechanism of retrotransposons, subsequently affecting recombination rates in genomes, leading to rapid genome divergence in close relationship species.…”
Section: Discussionmentioning
confidence: 99%