Cytogenetic characterization of a population of Bryconamericus aff. iheringii (Characidae,Tetragonopterinae)

Paintner-Marques, Tânia Regina; Giuliano-Caetano, Lúcia; Dias, Ana Lúcia

doi:10.1590/s1415-47572003000200007

Cited by 12 publications

(26 citation statements)

References 18 publications

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“…iheringii from the Água da Floresta River, Tibagi River Basin, analyzed by Paintner-Marques et al (2003), a single NOR in the region of the short arm of a submetacentric chromosome pair was observed, as evidenced also in some individuals, subject of this study. Paintner-Marques et al (2002b), analyzing Bryconamericus aff.…”

Section: Resultssupporting

confidence: 65%

“…iheringii, the subject of the present study, proved equal to cytotype II of Bryconamericus aff. exodon Eigenmann, 1907 also from the Três Bocas Stream/PR, with 10m+24sm+6st+12a and FN=92, a population that was analyzed by Paintner-Marques et al (2002a), thence leading to the conclusion that they are different species with the same karyotype or that this karyotype similarity may indicate that they are the same species, as were collected in the same locality. Wasko and Galetti Jr. (1998) analyzed Bryconamericus sp.…”

Section: Resultsmentioning

confidence: 99%

“…However, simple NORs have already been found in 2 populations of B. aff. iheringii Boulenger, 1887 by Paintner-Marques et al (2003) and Capistano et al (2008), and recently, Santos et al (2012) have observed single and multiple NORs in the same population of Bryconamericus ecai.…”

mentioning

confidence: 94%

“…E, analyzed by Wasko and Galetti Jr (1998), presents a different diploid number, 2n=54 and the variations in the karyotypic structure of this group of fish are significant, as listed in Table 1. The nucleolus organizer regions (NORs) are also quite variable in this genus, and may present intra-and intervariations in the number and location of ribosomal DNA cistrons, thus featuring Bryconamericus as a group with multiple NORs (Wasko et al 1996, Wasko and Galetti Jr. 1999, Paintner-Marques et al 2002a, Capistano et al 2008, Santos et al 2012. However, simple NORs have already been found in 2 populations of B. aff.…”

mentioning

confidence: 99%

“…The species of the genus Bryconamericus present specific C-banding patterns, showing variability in the heterochromatin location, are commonly found in pericentromeric heterochromatic regions and terminal (Paintner-Marques et al 2003 and some additional interstitial bands (Wasko et al 1996, Santos et al 2012.…”

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confidence: 99%

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Occurrence of Cytotypes and Variability of AgNORs in a Population of Bryconamericus aff. iheringii (Characidae)

et al. 2012

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SummaryIn the present study, we analyzed 20 specimens of Bryconamericus aff. iheringii (12 males and 8 females), collected from the Três Bocas Stream, a tributary of the Tibagi River/PR. All individuals analyzed presented 2n=52 and different karyotypic formulae resulting in 4 cytotypes: cytotype I, with 12m+16sm+10st+14a and FN=90; cytotype II, with 14m+18sm+10st+10a and FN=94; cytotype III, with 10m+24sm+6st+12a and FN=92; and cytotype IV with 10m+14sm+8st+20a and NF=84. Such structural karyotypic variations among Bryconamericus aff. iheringii specimens are probably due to the occurrence of chromosomal rearrangements, such as pericentric inversions. In some individuals, nucleolus organizer regions (AgNORs) were observed on the short arm of a single submetacentric chromosome pair. In other individuals of this same population, an interindividual variation from 2-5 NOR-bearing chromosomes with markings located on chromosomes of different types and size was detected, along with AgNOR size heteromorphism between the homologous chromosomes in a metacentric pair. Thence, this population of Bryconamericus aff. iheringii from the Três Bocas Stream seems to show the occurrence of both multiple and single NOR systems, and also the presence of different karyotypes (cytotypes), which might suggest the occurrence of 2 different species of Bryconamericus living in sympatry in that location. The data discussed here and those presented in the literature show the need for a taxonomic revision in this group of fish.

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Section: Resultssupporting

confidence: 65%

Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 94%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Occurrence of Cytotypes and Variability of AgNORs in a Population of Bryconamericus aff. iheringii (Characidae)

et al. 2012

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Occurrence of two cytotypes in Bryconamericus aff. iheringii (Characidae): karyotype analysis by C- and G-banding and replication bands

et al. 2007

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Cytogenetic analyses of Bryconamericus aff. iheringii specimens from the upper Paraná River basin (State of Paraná, Brazil) are provided. They had 2n = 52 chromosomes and two cytotypes with variations in their karyotypic formulae: cytotype I with 12 metacentric, 18 submetacentric, 8 subtelocentric and 14 acrocentric chromosomes with a fundamental number (FN) of 90; cytotype II with 8 metacentric, 28 submetacentric, 6 subtelocentric and 10 acrocentric chromosomes with a fundamental number (FN) of 94. Differences in C- and G-band patterns between the cytotypes, distinguishing marker chromosomes for each karyotype, were reported. The R-band pattern by 5-bromodeoxyuridine incorporation was obtained in chromosomes of the cytotype II sample. In some metaphases, the second pair of submetacentric chromosomes is distinctive: its short arm is heterochromatic (positive C-band), corresponding to a late replication region. In the same cytotype, a G- and R-band size heteromorphism w as recorded in the long arm of pair 9 (submetacentric). These methodologies revealed an actual karyotypic differentiation in the B. aff. iheringii population analyzed. Morphometrical comparative analyses and a discussion of evolutionary aspects of chromosome diversification in species of this genus are provided as well.

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Chromosomal Mapping of Repetitive DNA Sequences in the Genus Bryconamericus (Characidae) and DNA Barcoding to Differentiate Populations

et al. 2017

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The mapping of repetitive DNA sites by fluorescence in situ hybridization has been widely used for karyotype studies in different species of fish, especially when dealing with related species or even genera presenting high chromosome variability. This study analyzed three populations of Bryconamericus, with diploid number preserved, but with different karyotype formulae. Bryconamericus ecai, from the Forquetinha river/RS, presented three new cytotypes, increasing the number of karyotype forms to seven in this population. Other two populations of Bryconamericus sp. from the Vermelho stream/PR and Cambuta river/PR exhibited interpopulation variation. The chromosome mapping of rDNA sites revealed unique markings among the three populations, showing inter- and intrapopulation variability located in the terminal region. The molecular analysis using DNA barcoding complementing the cytogenetic analysis also showed differentiation among the three populations. The U2 small nuclear DNA repetitive sequence exhibited conserved features, being located in the interstitial region of a single chromosome pair. This is the first report on its occurrence in the genus Bryconamericus. Data obtained revealed a karyotype variability already assigned to the genus, along with polymorphism of ribosomal sites, demonstrating that this group of fish can be undergoing a divergent evolutionary process, constituting a substantive model for studies of chromosomal evolution.

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Cytogenetic characterization of a population of Bryconamericus aff. iheringii (Characidae,Tetragonopterinae)

Cited by 12 publications

References 18 publications

Occurrence of Cytotypes and Variability of AgNORs in a Population of <i>Bryconamericus</i> aff. <i>iheringii</i> (Characidae)

Occurrence of Cytotypes and Variability of AgNORs in a Population of <i>Bryconamericus</i> aff. <i>iheringii</i> (Characidae)

Occurrence of two cytotypes in Bryconamericus aff. iheringii (Characidae): karyotype analysis by C- and G-banding and replication bands

Chromosomal Mapping of Repetitive DNA Sequences in the Genus Bryconamericus (Characidae) and DNA Barcoding to Differentiate Populations

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