Structural chromosome polymorphism in a Pimelodus maculatus La Cepède, 1803 population (Siluriformes, Pimelodidae) from the Paranapanema River basin, PR, Brazil

Mazzuchelli, Juliana; Ac, Swarça; Al, Dias

doi:10.1590/s1519-69842007000500018

Cited by 9 publications

(6 citation statements)

References 11 publications

(13 reference statements)

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“…This kind of rearrangements have been reported for a number of other fish species (Garcia and Moreira-Filho, 2005; Mazzuchelli et al , 2007; Nakayama et al , 2008, 2012; Schneider et al , 2012). Besides having 2n = 54 as its exclusive diploid number, the “pacus” clade is the only one whose species consistently present only biarmed chromosomes (metacentric, submetacentric, and subtelocentric).…”

Section: Discussionsupporting

confidence: 78%

Chromosome mapping of repetitive sequences in four Serrasalmidae species (Characiformes)

2014

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The Serrasalmidae family is composed of a number of commercially interesting species, mainly in the Amazon region where most of these fishes occur. In the present study, we investigated the genomic organization of the 18S and 5S rDNA and telomeric sequences in mitotic chromosomes of four species from the basal clade of the Serrasalmidae family: Colossoma macropomum, Mylossoma aureum, M. duriventre, and Piaractus mesopotamicus, in order to understand the chromosomal evolution in the family. All the species studied had diploid numbers 2n = 54 and exclusively biarmed chromosomes, but variations of the karyotypic formulas were observed. C-banding resulted in similar patterns among the analyzed species, with heterochromatic blocks mainly present in centromeric regions. The 18S rDNA mapping of C. macropomum and P. mesopotamicus revealed multiple sites of this gene; 5S rDNA sites were detected in two chromosome pairs in all species, although not all of them were homeologs. Hybridization with a telomeric probe revealed signals in the terminal portions of chromosomes in all the species and an interstitial signal was observed in one pair of C. macropomum.

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Section: Discussionsupporting

confidence: 78%

Chromosome mapping of repetitive sequences in four Serrasalmidae species (Characiformes)

2014

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“…There are differences in the karyotype formula and FN between the two populations, mainly due to the greater amount of acrocentric chromosomes in the population of the Upper Paraná . A similar case occurs with Pimelodus maculatus (2n = 56 chromosomes), in which different populations have the same diploid number and variations in the karyotype formula and FN; inversion and/or translocation rearrangements are proposed to explain this diversity (Mazzuchelli et al, 2007;Treco et al, 2008). Compared with findings on the other P. galeatus population in the Upper Paraná , the data from the present study indicate that these chromosomal rearrangements may also account for the karyotype differences.…”

Section: Discussionsupporting

confidence: 75%

First description of B chromosomes in the family Auchenipteridae, Parauchenipterus galeatus (Siluriformes) of the São Francisco River basin (MG, Brazil)

Lui

Blanco

Margarido

et al. 2009

Micron

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“…The diploid number (2n = 56) found for the population of A. inermis analyzed in this work is equal to the one found for a population of the Solimões River (Fenocchio & Bertollo, 1992) (Amazon basin); however, in the population of Catalão Lake (Amazon basin), a lower diploid number (2n = 54) was found (Santos & Nakayama, 2011). Despite the conservation of the diploid number between the population of the Solimões River and the population of the present study, there are some small differences related to the karyotypic constitution that may be due to translocations and/or pericentric inversions, a situation commonly observed in other fish species, for example Rhamdia quelen (Heptapteridae) (Garcia et al, 2010;Martinez et al, 2011), Parauchenipterus galeatus (Auchenipteridae) , Hoplias malabaricus (Erythrinidae) , Pimelodus maculatus (Pimelodidae) (Mazzuchelli et al, 2007;Treco et al, 2008), Hypostomus ancistroides (Loricariidae) (Bueno et al, 2012(Bueno et al, , 2013, among others.…”

Section: Discussionmentioning

confidence: 64%

The role of chromosomal fusion in the karyotypic evolution of the genus Ageneiosus (Siluriformes: Auchenipteridae)

et al. 2013

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Ageneiosus is the most widely distributed genus of the family Auchenipteridae among South American river basins. Although chromosome studies in the family are scarce, this genus has the largest number of analyzed species, with 2n = 54 to 56 chromosomes, differing from the rest of the family (2n = 58). This study aimed to analyze Ageneiosus inermis from the Araguaia River basin. The diploid number found was of 56 chromosomes. Heterochromatin was allocated in terminal region of most chromosomes, plus a pericentromeric heterochromatic block in pair 1, a pair distinguished by size in relation to other chromosomes pairs. AgNORs were detected in only one submetacentric chromosome pair, which was confirmed by FISH. 5S rDNA was present in only one metacentric chromosome pair. Hybridization with [TTAGGG] n sequence marked the telomeres of all chromosomes, in addition to an ITS in the proximal region of the short arm of pair 1. The repetitive [GATA] n sequence was dispersed, with preferential location in terminal region of the chromosomes. Ageneiosus has a genomic organization somewhat different when compared to other Auchenipteridae species. Evidences indicate that a chromosomal fusion originated the first metacentric chromosome pair in A. inermis, rearrangement which may be a basal event for the genus.Ageneiosus é o gênero da família Auchenipteridae mais amplamente distribuído em bacias da América do Sul. Apesar dos estudos cromossômicos nesta família serem escassos, este gênero tem o maior número de espécies analisadas, com número diploide variando de 54 a 56 cromossomos, o que difere do restante da família (2n = 58). Este estudo objetivou analisar Ageneiosus inermis da bacia do rio Araguaia. O número diploide encontrado foi de 56 cromossomos. A heterocromatina se mostrou localizada na região terminal da maioria dos cromossomos, além de um bloco heterocromático pericentromérico no par 1, um par facilmente distinguível no cariótipo pelo seu maior tamanho quando comparado aos outros pares do complemento. AgRONs foram detectadas em somente um par de cromossomos submetacêntricos, que foi confirmado pela FISH. 5S rDNA se mostrou presente em somente um par de cromossomos metacêntricos. A hibridização com a sequência [TTAGGG] n marcou os telômeros de todos os cromossomos, além de um ITS (sequência telomérica intersticial) na região proximal do braço curto do par 1. A sequência repetitiva [GATA] n se mostrou dispersa, com localização preferencial na região terminal dos cromossomos. Ageneiosus apresenta uma organização genômica um pouco diferente quando comparada a outras espécies de Auchenipteridae. As evidências indicam que uma fusão cromossômica originou o primeiro par de cromossomos metacêntricos de A. inermis, rearranjo que parece ser um evento basal para o gênero.

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Structural chromosome polymorphism in a Pimelodus maculatus La Cepède, 1803 population (Siluriformes, Pimelodidae) from the Paranapanema River basin, PR, Brazil

Cited by 9 publications

References 11 publications

Chromosome mapping of repetitive sequences in four Serrasalmidae species (Characiformes)

Chromosome mapping of repetitive sequences in four Serrasalmidae species (Characiformes)

First description of B chromosomes in the family Auchenipteridae, Parauchenipterus galeatus (Siluriformes) of the São Francisco River basin (MG, Brazil)

The role of chromosomal fusion in the karyotypic evolution of the genus Ageneiosus (Siluriformes: Auchenipteridae)

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