Multiple NORs in Bryconamericus aff. exodon (Osteichthyes, Characidae, Tetragonopterinae)

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

doi:10.1034/j.1601-5223.2002.01651.x

Cited by 19 publications

(19 citation statements)

References 17 publications

(19 reference statements)

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“…However, despite the macrostructural similarity among karyotypes, the lutjanids presented a relative diversification in the location of ribosomal sites. Thus, interstitial Ag-NORs on large chromosomal pairs have been detected in L. alexandrei, L. cyanopterus and O. chrysurus Multiple NORs have rarely been reported in Perciformes (Galetti et al, 2000), although they are common in Characiformes and Siluriformes (Mantovani et al, 2000;Paintner-Marques et al, 2002). Mostly, such variation results from chromosomal rearrangements, but transposition events have also been indicated as one major factor for the numerical variability of NORs in fishes (Galetti et al, 1995;Almeida-Toledo et al, 1996;Castro et al, 1996;Vitturi et al, 1996).…”

Section: Discussionmentioning

confidence: 99%

Cytogenetic analysis in western Atlantic snappers (Perciformes, Lutjanidae)

Rocha

Molina

2008

Genet. Mol. Biol.

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The Lutjanidae or snappers are a family of perciform fishes, mainly marine but with some members living in estuaries and entering fresh water to feed. Some are important food fish. Cytogenetic data for Lutjanidae are scarce. In the present work, we cytogenetically characterized through conventional Giemsa staining techniques, Ag-NOR and C-banding the species Ocyurus chrysurus, Lutjanus analis, L. alexandrei, L. cyanopterus, L. jocu and L. synagris, all found along the Brazilian coast. Karyotype analysis of all six species showed a modal value of 2n = 48 acrocentric chromosomes. Single NORs were found at pericentromeric position on the long arms of the 2 nd pair in O. chrysurus, L. alexandrei and L. cyanopterus, on the 5 th pair in L. analis and on the 23 rd pair in L. synagris. The species L. jocu presented multiple NORs located on the 2 nd pair at a pericentromeric region and on the 5 th pair at a telomeric region. Heterochromatic blocks were identified at the centromeric region of all chromosomes of the studied species. These results indicate that, despite of the chromosomal stability of this family, a relative structural diversification seems to have occurred in the chromosome evolution of the group. Such diversification was evidenced by divergent number and location of ribosomal sites among species. The NOR-bearing pairs represented an efficient cytotaxonomic marker for most of the analyzed species. The data suggest that the presence of interstitially located single NORs on a large acrocentric pair should represent a basal condition for lutjanids.

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Section: Discussionmentioning

confidence: 99%

Cytogenetic analysis in western Atlantic snappers (Perciformes, Lutjanidae)

Rocha

Molina

2008

Genet. Mol. Biol.

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“…A similar condition has been reported in Bryconamericus aff. exodon, where 2 to 5 Ag-NOR sites and eight 18S rDNA sites were detected (Paintner-Marques et al, 2002b). The FISH approach using an 18S rDNA probe was extremely important for the distinction between cytotypes I and II with regard to numbers of structural NORs.…”

Section: Discussionmentioning

confidence: 99%

“…Chromosome banding in Bryconamericus species has contributed towards a better understanding of the structural chromosome diversity of the group. Bryconamericus showed extensive variability of NORs (Wasko and Galetti Jr., 1999;Paintner-Marques et al, 2002b), and each species could be characterized by a specific C-banding pattern (Wasko and Galletti Jr., 1998).…”

Section: Discussionmentioning

confidence: 99%

Chromosome divergence and NOR polymorphism in Bryconamericus aff. iheringii (Teleostei, Characidae) in the hydrographic systems of the Paranapanema and Ivaí Rivers, Paraná, Brazil

2008

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Cytogenetic studies were carried out in three populations of Bryconamericus aff. iheringii from two hydrographic systems of the Paranapanema and Ivaí Rivers, separated by a watershed, both belonging to the upper Paraná River basin. Specimens had a constant diploid number 2n = 52 chromosomes. However, three karyotype formulae were identified in the three populations: B. aff. iheringii from the Maringá stream had 12M+18SM+8ST+14A (FN = 90); specimens from Keller River showed 8M+28SM+6ST+10A (FN = 94) and specimens from the Tatupeba stream had 8M+20SM+8ST+16A (FN = 88). Nucleolar organizer regions (NORs) were identified by silver nitrate staining and fluorescent in situ hybridization (FISH) with an 18S rDNA probe. Specimens from Tatupeba stream had a simple NOR system located in a terminal position of the short arm of a pair of large submetacentric chromosomes. Ag-NOR and FISH methodologies revealed multiple NORs in specimens of the Maringá stream and Keller River. Differences in chromosome structure and in NOR patterns in the three populations of B. aff. iheringii revealed fixed evolutionary chromosome divergence. Aspects related to karyotypic variations and to geographic isolation of these populations are discussed.

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“…This is in agreement with several previous reports on Moenkhausia sanctaefilomenae (Foresti et al 1989), Aphanius fasciatus (Vitturi et al 1995), Leporinus friderici (Galetti et al 1995), Salmo trutta (Castro et al 1996), Salvelinus alpines (Reed and Phillips 1997), Chondrostoma lusitanicum (Rodrigues andCollares-Pereira 1996, Collares-Pereira andRáb 1999), Hoplias malabaricus (Born and Bertollo 2000), Oedalechilus labeo (Rossi et al 2000), Astyanax scabripinnis (Mantovani et al 2000, Marco-Ferro et al 2001, Soza et al 2001, A. altiparanae (Pacheco et al 2001, Mantovani et al 2005, Bryconamericus aff. exodon (Paintner-Marques et al 2002), Apareiodon affinis (Jorge and Filho 2004), Aphanius fasciatus (Vitturi et al 2005), Prochilodus lineatus (Gras et al 2007), B. aff. iheringii (Capistano et al 2008), and Puntioplites proctozysron (Supiwong et al 2012).…”

Section: Resultsmentioning

confidence: 99%

First Report of NOR Polymorphism and Chromosome Analysis of John's Snapper, <i>Lutjanus johnii</i> (Perciformes, Lutjanidae) in Thailand

et al. 2013

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SummaryThe present study reports the first finding of the NOR (nucleolar organizer region) polymorphism and chromosome analysis in the John's snapper (Lutjanus johnii) from Thailand. Kidney cell samples were taken from four male and four female fish. Mitotic chromosome preparations were conducted using the standard squash technique, as well as directly from kidney cells. Metaphase spreads were performed on microscopic slides and then air-dried. Conventional and Ag-NOR banding techniques were applied to stain the chromosome. The results showed that the diploid chromosome number of L. johnii was 2n=48, and the fundamental number (NF) was 48 in both male and female. Karyotpes were present as 28 large telocentric, 16 medium telocentric, and 4 small telocentric chromosomes. No strange-sized chromosomes related to sex were observed. The results indicated that the long arm subcentromeric of the telocentric chromosome pair 1 showed clearly observable NORs (satellite chromosomes). In addition, a heteromorphism of one female had differentsized NORs in chromosome pair 1 (1a1b), while three females and four males had equal-sized NORs in chromosome pair 1 with a homomorphism (1a1a). The karyotype formula for L. johnii is as follows:2n ( The family Lutjanidae (lutjanid fish), or snappers, is a family of perciform fishes, mainly marine but with some members living in estuaries and entering freshwater to feed. Some of them are important food fish. Species from the family Lutjanidae represent one of the major resources for marine fishery. Lutjanid fish are widespread over the Atlantic, Pacific, and Indian oceans. Fishes of the family Lutjanidae occur in tropical and subtropical seas from shallow waters to depths of approximately 550 m. This family comprises 17 genera with about 105 species, and the genus Lutjanus with 64 species is the largest genus including over half of the species in this family (Nelson 2006).In spite of the high number of species and its worldwide distribution, the family Lutjanidae has been little investigated, and contradictory results have been obtained concerning the phylogenetic relationships and the taxonomic status of some of its genera and species. For example, the validity of the genus Ocyurus has been extensively discussed (Chow and Walsh 1992, Domeier and Clarke 1992, Loftus 1992, leading some authors to propose the synonymization of genus

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Multiple NORs in Bryconamericus aff. exodon (Osteichthyes, Characidae, Tetragonopterinae)

Cited by 19 publications

References 17 publications

Cytogenetic analysis in western Atlantic snappers (Perciformes, Lutjanidae)

Cytogenetic analysis in western Atlantic snappers (Perciformes, Lutjanidae)

Chromosome divergence and NOR polymorphism in Bryconamericus aff. iheringii (Teleostei, Characidae) in the hydrographic systems of the Paranapanema and Ivaí Rivers, Paraná, Brazil

First Report of NOR Polymorphism and Chromosome Analysis of John's Snapper, <i>Lutjanus johnii</i> (Perciformes, Lutjanidae) in Thailand

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