2018
DOI: 10.1590/1678-4324-2018180417
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Abstract: The karyotypes of three armored catfish species (Loricariidae) from the Iguaçu river, southern of the Brazil, were compared using different techniques: C-banding, Ag-NOR and fluorescence in situ hybridization (FISH), which used 5S and 18S rDNAs and total Cot-1 fraction as probes. Hypostomus commersoni and Hypostomus derbyi presented 2n = 68 chromosomes, with karyotype formulae 12m+12sm+14st+30a and 12m+12sm+10st+34a, respectively; whereas Hypostomus myersi presented 2n = 74 chromosomes and 12m+16sm+12st+34a. T… Show more

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Cited by 6 publications
(3 citation statements)
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“…In Hypostomus , several cases of chromosomal polymorphism associated with the amplification of the heterochromatin, with or without ribosomal genes, have been reported (Artoni and Bertollo 1999; Traldi et al 2012; Baumgärtner et al 2014; Lorscheider et al 2018), but in none of these cases was the polymorphism found in only one of the sexes. In the present paper, all the H. soniae individuals analyzed had the same karyotype structures, although differences were found between the sexes in pair No.…”
Section: Discussionmentioning
confidence: 99%
“…In Hypostomus , several cases of chromosomal polymorphism associated with the amplification of the heterochromatin, with or without ribosomal genes, have been reported (Artoni and Bertollo 1999; Traldi et al 2012; Baumgärtner et al 2014; Lorscheider et al 2018), but in none of these cases was the polymorphism found in only one of the sexes. In the present paper, all the H. soniae individuals analyzed had the same karyotype structures, although differences were found between the sexes in pair No.…”
Section: Discussionmentioning
confidence: 99%
“…The prospection of repetitive sequences by the technique of DNA reassociation kinetics (C0t-1) proves to be a safe and fast technique for obtaining copies of highly and moderately repetitive DNA sequences [45]. Thus, it is possible to build libraries and screening repetitive DNAs, and has been used to isolate the highly repeated fraction of the plant genome [46] and animals [47] to significantly expand our knowledge of the organization of their chromosomes.…”
Section: New Repetitive Sequences Studies In the Genus Gymnotusmentioning
confidence: 99%
“…Satellite DNA and TEs are responsible for a large part of the structural and functional organization of genomes (Sumner 2003, Feschotte 2008), and carry sequences containing DNA double-strand break hotspots, resulting in chromosome/genome reshuffle (Eichler and Sankoff 2003, Longo et al 2009, Farré et al 2011, Barros et al 2017a, Glugoski et al 2018). The movement of repetitive sequences within the genome promotes chromosomal differentiation, which has an important role on karyotype evolution (Wichman et al 1991, Pucci et al 2016, 2018a, 2018b, Lorscheider et al 2018, do Nascimento et al 2018).…”
Section: Introductionmentioning
confidence: 99%