2011
DOI: 10.1590/s1679-62252011005000002
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Abstract: Karyotypic data are presented for four species of fish belonging to the Pimelodidae family. These species show a conserved diploid number, 2n = 56 chromosomes, with different karyotypic formulae. The analyzed species showed little amount of heterochromatin located preferentially in the centromeric and telomeric regions of some chromosomes. The nucleolus organizer regions activity (Ag-NORs) and the chromosomal location of ribosomal genes by fluorescent in situ hybridization (FISH), with 18S and 5S probes, showi… Show more

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Cited by 19 publications
(19 citation statements)
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References 23 publications
(19 reference statements)
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“…In addition to P. lineatus (Jesus and Moreira-Filho, 2003; Vicari et al , 2006; Voltolin et al , 2009), this synteny was also observed in Salmo salar (Pendás et al , 1994), Oncorhynchus mykiss (Móran et al , 1996), Astyanax (Almeida-Toledo et al , 2002), in amphibians (Lucchini et al , 1993) and, more recently, in Pimelodus britskii (Moraes-Neto et al , 2011). On the other hand, these loci have been mapped on different chromosomes in many fish species (Martinez et al , 1996; Morán et al , 1996; Born and Bertollo , 2000 ; Ferro et al , 2001; Vicente et al , 2001; Wasko et al , 2001; Noleto et al , 2007), representing the most frequent condition in vertebrates (Lucchini et al , 1993; Drouin and Muniz De Sá, 1995, Suzuki et al , 1996).…”
Section: Discussionmentioning
confidence: 77%
“…In addition to P. lineatus (Jesus and Moreira-Filho, 2003; Vicari et al , 2006; Voltolin et al , 2009), this synteny was also observed in Salmo salar (Pendás et al , 1994), Oncorhynchus mykiss (Móran et al , 1996), Astyanax (Almeida-Toledo et al , 2002), in amphibians (Lucchini et al , 1993) and, more recently, in Pimelodus britskii (Moraes-Neto et al , 2011). On the other hand, these loci have been mapped on different chromosomes in many fish species (Martinez et al , 1996; Morán et al , 1996; Born and Bertollo , 2000 ; Ferro et al , 2001; Vicente et al , 2001; Wasko et al , 2001; Noleto et al , 2007), representing the most frequent condition in vertebrates (Lucchini et al , 1993; Drouin and Muniz De Sá, 1995, Suzuki et al , 1996).…”
Section: Discussionmentioning
confidence: 77%
“…Gene conversion and unequal crossing mechanisms are likely to occur in 18S and 5S rDNA sites with syntenic arrangements; thus, the location of these genes on different chromosomes avoids possible unfavorable rearrangements (Dover, 1986). However, several groups of Neotropical fish carry the major and minor ribosomal genes in the same chromosome in an adjacent, distant or co-located position (Hatanaka and Galetti Jr., 2004;Moraes-Neto et al, 2011). The synteny between ribosomal genes in metacentric/submetacentric pairs observed in H. ancistroides and H. tapijara is the first report of this condition in the genus.…”
Section: Physical Mapping Of Ribosomal Genes In Hypostomusmentioning
confidence: 99%
“…Cytogenetic studies on Steindachneridion are available for S. scriptum (Swarça et al, 2005a), S. melanodermatum (= Steindachneridion sp.) (Swarça et al, 2006) and S. parahybae (Moraes-Neto et al, 2011) and despite sharing some chromosomal similarities, cytogenetic traits of the S. doceanum (present paper) such as karyotypic formula, Ag-NORS and C-banding patterns were divergent (Tab. 1).…”
Section: Discussionmentioning
confidence: 55%
“…Three species of the genus were previously studied cytogenetically, Steindachneridion scriptum (Swarça et al, 2005a), S. melanodermatum (= Steindachneridion sp.) (Swarça et al, 2006) and S. parahybae (Moraes-Neto et al, 2011). The aim of the present study was to characterize S. doceanum at the karyotypic level by means of standard and fluorescent in situ hybridization techniques comparing the obtained data with these from other Steindachneridion species.…”
Section: Basin Brazilmentioning
confidence: 91%