Heterochromatin patterns and karyotype relationships within and between the genera Brycon and Salminus (Pisces, Characidae)

Margarido, Vladimir Pavan; Galetti, Pedro Manoel

doi:10.1590/s1415-47571999000300012

Cited by 29 publications

(30 citation statements)

References 10 publications

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“…The chromosomal data available for the genus Brycon (Table 1) indicate the presence of a common ancestral karyotype, with a basic diploid number 2n = 50, which have not suffered extensive chromosomal rearrangements, conserving the karyotypic structure in the genus. This hypothesis was also proposed by some other authors to explain the chromosomal stasis in Brycon (Margarido, Galetti, 1999;Parada et al, 2003;Brassesco et al, 2004). Concerning the heterochromatin distribution the presence of a large metacentric pair bearing equilocal paracentromeric heterochromatin on both chromosome arms observed in the karyotype of B. amazonicus was also described in B. orthotaenia Günther, 1864 andB.…”

Section: Comp Cytogenet 2010 4(2)supporting

confidence: 65%

“…Besides the heterochromatin observed in the submetacentric elements, some other metacentric chromosomes showed C positive bands in pairs 2 and 3 in B. hilarii and in pairs 2 and 6 in B. orthotaenia. Moreover, the heterochromatin distribution of submeta centric chromosomes was also distinct (Margarido, Galetti, 1999). So far, several distribution patterns of constitutive heterochromatin have been observed in different species of Brycon analyzed thus far.…”

Section: Comp Cytogenet 2010 4(2)mentioning

confidence: 90%

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Cytogenetic characterization of Brycon amazonicus (Spix et Agassiz, 1829) (Teleostei: Characidae) from Caicara del Orinoco, Venezuela

Mariguela¹,

Nirchio²,

Ron³

et al. 2010

CCG

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Abstract.A cytogenetic analysis by conventional Giemsa staining, silver staining, C-banding, and fl uorescence in situ hybridization (FISH) was carried out on Brycon amazonicus from Caicara del Orinoco, Venezuela. The karyotype of this species is characterized by the presence of 2n = 50 chromosomes, a karyotypic formula 22m+14sm+14st, and a fundamental number of 100 chromosomal arms. Nucleolar organizer regions (NORs) and 18S rDNA genes are located in the terminal regions of the long arms of the second pair of subtelocentric chromosomes, corresponding to pair 13. C-banding revealed heterochromatin distribution in only seven chromosome pairs. The largest metacentric pair (number 1) possesses a paracentromeric block equilocally distributed in both chromosome arms, whereas in pairs 12 to 17 positive C band blocks were located in the paracentromeric region of the long arm, close to the centromere. Analysis performed with 5S rDNA gene revealed a terminal site located on the short arm of one small submetacentric chromosome (pair 15) corroborating previous studies with this repetitive gene showing an apparent conservation of 5S rDNA in the genome of these fi sh species. The data obtained in this study reinforce the chromosomal conservativeness in the species of the genus Brycon, related not only to the macro-chromosomal structure (diploid number, karyotypic formula, and fundamental number), but also to the repeated DNAs, such as heterochromatic regions and ribosomal DNAs. These data will contribute to a better understanding of chromosomal evolution in both Brycon and Characidae fi shes.

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Section: Comp Cytogenet 2010 4(2)supporting

confidence: 65%

Section: Comp Cytogenet 2010 4(2)mentioning

confidence: 90%

Cytogenetic characterization of Brycon amazonicus (Spix et Agassiz, 1829) (Teleostei: Characidae) from Caicara del Orinoco, Venezuela

Mariguela¹,

Nirchio²,

Ron³

et al. 2010

CCG

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“…Some characins may present both single and multiple chromosomes bearing NORs, such as A. bockmanni¸ B. stramineus and P. argentea, while others are characterized by presenting only a single pair of NORs, such as [Bryconinae (Almeida-Toledo et al 1996, Margarido andGaletti Jr. 1999)], or multiple NORs, such as [Serrasalminae (Galetti Jr et al 1985)]. Thus, the number and Portela et al (1988) and a population of A. bockmanni analyzed by Kavalco et al (2009), presented up to 4 chromosomes with Ag-NORs.…”

Section: Discussionmentioning

confidence: 99%

Cytogenetic Studies Comparing Three Characidae Fish Species from the Iguatemi River Basin, Brazil

Fernandes

Piscor

Bailly³

et al. 2010

CYTOLOGIA

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Summary Characidae is one of the predominant fish groups in the Neotropical region with approximately 30 highly diversified subfamilies, probably not representing a monophyletic group. Three Characidae species from the Iguatemi River Basin (Mundo Novo, MS, Brazil) were analyzed: Astyanax bockmanni with 2nϭ50 chromosomes (6mϩ20smϩ8stϩ16a), Bryconamericus stramineus with 2nϭ52 chromosomes (6mϩ10smϩ16stϩ20a) and Piabina argentea with 2nϭ52 chromosomes (6mϩ24smϩ12stϩ10a), all the species showing no differences between male and female karyotypes. The Ag-NORs were located in only a single chromosome pair in the three species. The chromosomal data obtained may be useful for the taxonomy and phylogenetic studies in these fish groups.

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“…Indeed, most of the Neotropical fish species present single NORs, such as reported in Curimatidae [20], Parodontidae [21,22], Salminae, and Bryconinae [23], among others.…”

Section: Discussionmentioning

confidence: 99%

Conserved Cytogenetic Features in the Amazonian Arapaima, Arapaima gigas (Schinz 1822) from Jamari River, Rondônia–Brazil

Rosa¹,

Rubert²,

Caetano-Filho³

et al. 2009

TOBIOJ

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Specimens of Arapaima gigas from Jamari River (RO) were cytogenetically analyzed. A diploid number of 2n=56 chromosomes was found (28m-sm + 28st-a). Secondary constrictions were observed on the short arms of chromosome 3. Nucleolar Organizer Regions (NORs) were detected at the subterminal region on short arms of the third chromosomal pair by both silver nitrate staining and FISH with 45S rDNA probe, being equivalent to secondary constrictions. The ribosomal sites were also characterized by size heteromorphism and presence of CMA 3 + /DAPI -blocks. The constitutive heterochromatin was located at pericentromeric region of some chromosomes. After sequential Cbanding and base-specific fluorochromes staining, most of the heterochromatins proved to be neutral, i.e., with similar amounts of AT and GC bases. Nonetheless, some heterochromatic regions were marked by GC-specific fluorochromes in one chromosomal pair and by AT-specific fluorochrome staining on two pairs. The present data are in agreement with previous reports in populations from Araguaya River, indicating that conserved cytogenetic features are present in this important fish species.

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Heterochromatin patterns and karyotype relationships within and between the genera Brycon and Salminus (Pisces, Characidae)

Cited by 29 publications

References 10 publications

Cytogenetic characterization of Brycon amazonicus (Spix et Agassiz, 1829) (Teleostei: Characidae) from Caicara del Orinoco, Venezuela

Cytogenetic characterization of Brycon amazonicus (Spix et Agassiz, 1829) (Teleostei: Characidae) from Caicara del Orinoco, Venezuela

Cytogenetic Studies Comparing Three Characidae Fish Species from the Iguatemi River Basin, Brazil

Conserved Cytogenetic Features in the Amazonian Arapaima, Arapaima gigas (Schinz 1822) from Jamari River, Rondônia–Brazil

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