Trends in the karyotypic evolution of the Neotropical catfish family Heptapteridae Bockmann 1998 (Teleostei: Siluriformes)

Borba, Rafael Splendore de; Silva, Edson Lourenço da; Pacheco, Ana Carolina Sales; Parise-Maltempi, Patrícia Pasquali; Alves, Ana Liz Garcia

doi:10.1007/s11160-011-9245-3

Cited by 13 publications

(25 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The result of using a 18S DNAr probe in I. schubarti in the present study and those obtained by Borba et al (2011), and in I. cf. schubarti (Kantek et al, 2009), were similar in terms of the Ag-NORs.…”

Section: Discussionsupporting

confidence: 81%

“…schubarti (Kantek et al, 2009), were similar in terms of the Ag-NORs. The NORs observed on the long arm of different types of chromosome in this genus can be explained by rearrangements, such as inversions, deletions, and duplications (Borba et al, 2011). A position in the terminal region of a subtelocentric chromosome is probably the ancestral condition, and is similar to that observed in I. hollandi (Margarido and Moreira-Filho, 2008).…”

Section: Discussionsupporting

confidence: 61%

“…In general, Heptapterids have small amounts of heterochromatin that are located in terminal and pericentromeric regions (Moraes et al, 2007). Borba et al (2011) suggested that C-banding is not a good cytological marker method for this group; however, the results found for P. taenioptera demonstrate that heterochromatin constitutes a differential marker in this species in relation to others groups of the Heptapteridae.…”

Section: Discussionmentioning

confidence: 78%

“…The predominance of two-armed chromosomes (M, SM, and ST), and the low variation in diploid number (2n = 58, 2n = 42), suggest that centric fission events were less important than pericentric inversion during the evolutionary history of the group (Borba et al, 2011). According to Borba et al (2011), a possible plesiomorphic condition of heptapteridan karyotypes would consist of 2n = 58 chromosomes of the M and SM types and a simple subterminal position of Ag-NORs, with a trend of maintaining this diploid number in most species, while reducing 2n by successive chromosomal fusion events.…”

Section: Discussionmentioning

confidence: 99%

“…An interstitial position on metacentric chromosomes, as detected in I. mirini (Vissoto et al, 1997), I. aff. schubarti (Stolf et al, 2004, Borba et al, 2011, and I. schubarti (Kantek et al, 2009), is probably a derived condition. The transfer from a submetacentric terminal position to an interstitial position on a pair of metacentric chromosomes probably occurred due to pericentromeric inversion.…”

Section: Discussionmentioning

confidence: 99%

See 4 more Smart Citations

Cytogenetic characterization of species of the family Heptapteridae (Teleostei: Siluriformes) from the Cuiabá and Ivaí River Basins, Brazil

Barbosa¹,

Ferreira²,

Prizon³

et al. 2015

Genet. Mol. Res.

View full text Add to dashboard Cite

ABSTRACT. We cytogenetically characterized three species of Heptapteridae (Pimelodella sp, Pimelodella taenioptera, and Imparfinis schubarti) by investigating the distribution of constitutive heterochromatin and nucleolar organizer regions by silver nitrate impregnation (Ag-NOR) and fluorescence in situ hybridization. Pimelodella sp showed had a diploid number (2n) = 46 chromosomes, 26m + 10sm + 10st, and FN = 92; P. taenioptera, 2n = 52 chromosomes, 26m + 22sm + 4st, and FN = 104; and I. schubarti, 2n = 58 chromosomes, 28m + 28sm + 2st, and FN = 116. The two Pimelodella species had Ag-NORs sites on the submetacentric pair 14, located on the short arm in terminal position. In I. schubarti, the Ag-NORs sites were in an interstitial position on the long arm of the metacentric pair 1. C-banding revealed that Pimelodella sp contained a small amount of constitutive heterochroma- Cytogenetics of species of the family Heptapteridae tin, whereas P. taenioptera contained a higher number of heterochromatic regions, in the pericentromeric, interstitial, and telomeric positions. I. schubarti had markers in centromeric and telomeric regions of a few chromosomes, and a large pericentromeric block on pair 1. Fluorochrome chromomycin A 3 (CMA 3 ) staining revealed positive signals on pair 14 in both Pimelodella species. Treatment with 4ꞌ,6-diamidino-2-phenylindole (DAPI) revealed no markings in P. taenioptera, but an interstitial marking on the long arm of pair 14 in Pimelodella sp. In I. schubarti, positive signals of CMA 3 were detected in the first pair, but negative signals were detected for DAPI staining. These results contribute to the karyotypic description of the less-studied species in the Brazilian Midwest.

show abstract

Section: Discussionsupporting

confidence: 81%

Section: Discussionsupporting

confidence: 61%

Section: Discussionmentioning

confidence: 78%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

See 3 more Smart Citations