Cytogenetic studies in fishes of the genera Hassar, Platydoras and Opsodoras (Doradidae, Siluriformes) from Jarí and Xingú Rivers, Brazil

Suely, Susana; Milhomem, Rodrigues; Cesar, A.C.G.; Souza, Augusto César Paes de; Lira, Aline De Oliveira; Carvalho, Jaime Ribeiro; Feldberg, Eliana; Pieczarka, Júlio César; Nagamachi, Cleusa Yoshiko

doi:10.1590/s1415-47572008000200017

Cited by 21 publications

(19 citation statements)

References 6 publications

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“…Except for the Ageneiosus species, the other genera with cytogenetic analyses (Auchenipterus, Glanidium, Parauchenipterus and Tatia) also show this conserved pattern of the diploid number 58. The sister-group of Auchenipteridae is the Doradidae family (Pinna, 1998), which presents a basal diploid number equal to 58 chromosomes (Eler et al, 2007;Milhomem et al, 2008), the same that is considered basal for Auchenipteridae (Lui et al, 2013a). This same diploid number was found for the population of G. ribeiroi in this paper, and for other populations of the same species previously studied (see Table 1) (Ravedutti and Julio Junior, 2001;Fenocchio et al, 2008).…”

Section: Discussionsupporting

confidence: 81%

Karyotypic variation of Glanidium ribeiroi Haseman, 1911 (Siluriformes, Auchenipteridae) along the Iguazu river basin

et al. 2015

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The Iguazu river is a tributary of the left margin of the Paraná river, isolated from this basin about 22 million years ago with the appearance of the Iguazu Falls. The Iguazu river is characterized by high endemism due to two factors: its rugged topography and the old isolation caused by formation of the Iguazu Falls. This study analyzed cytogenetically a population of Glanidium ribeiroi collected in a region at the final stretch of this basin, by Giemsa staining, C-banding, impregnation by silver nitrate, and FISH with probes of 5S rDNA, 18S rDNA, telomeric sequence [TTAGGG] n , and [GATA] n repeats. The diploid number was equal to 58 chromosomes. The heterochromatin was present in the terminal region of almost all chromosomes. The Ag-NORs were simple and presented interstitially on the short arm of the submetacentric pair 14, which was confirmed by FISH with 18S rDNA probe. The 5S rDNA-FISH marked only the submetacentric pair 16 on the long arm in interstitial position. The FISH with [TTAGGG] n probe presented all telomeres labeled as expected, with an absence of Interstitial Telomeric Sequence (ITS). The repetitive [GATA] n sequence was dispersed throughout the genome, with preferential location in the terminal region of all chromosomes. The data obtained are discussed herein with other species of Auchenipteridae, and other previously analyzed populations of G. ribeiroi from the Iguazu river, verifying differences among these populations, which should be mainly related to the rugged topography of this basin.Keywords: geographical barriers, ribosomal DNA, Glanidium ribeiroi, Iguazu river. Variação cariotípica de Glanidium ribeiroi

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Section: Discussionsupporting

confidence: 81%

Karyotypic variation of Glanidium ribeiroi Haseman, 1911 (Siluriformes, Auchenipteridae) along the Iguazu river basin

et al. 2015

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“…Based on cytogenetic data of 41 Neotropical cichlid species, Thompson (1979) inferred that the karyotype in this fish group has been enough conservative, with a diploid number (2n) about 48 and FN ranging from 48 to 70. This inference has been confirmed by many recent studies (LOUREIRO, 1999;MARESCALCHI, 2005;MIZOGUCHI et al, 2007;BENZAQUEM et al, 2008;VALENTE et al, 2012).…”

Section: Resultssupporting

confidence: 57%

“…This characteristic has been proposed by some authors as a conserved trait for this family, suggesting that the ancestral karyotype consisted of 48 acrocentric chromosomes (THOMPSON, 1979;MARTINS et al, 1995;FELDBERG et al, 2003;PERAZZO et al, 2011). Based on cytogenetic data of 41 Neotropical cichlid species, Thompson (1979) inferred that the karyotype in this fish group has been enough conservative, with a diploid number (2n) about 48 and FN ranging from 48 to 70.…”

Section: Resultsmentioning

confidence: 60%

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Description of the karyotype of Geophagus cf. proximus (Perciformes, Cichlidae, Geophaginae)

Rocha

Souza

Rayol

et al. 2013

Acta Sci. Biol. Sci.

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ABSTRACT. This study described the karyotype of Geophagus cf. proximus. Specimens were collected in Água Preta Lake, Parque Ambiental de Belém, Pará State, Brazil. The karyotype were 2n = 48 chromosomes (FN = 60: 12M/SM+36ST/A) and no sexual chromosome differentiation. C-banding showed centromeric staining in all chromosomes. The first chromosome pair, besides centromeric coloration, presented a totally heterochromatic long arm. The nucleolus organizer regions (NORs) were studied by means of AgNO 3 . NORs were located at the short arm of the second chromosome pair.Keywords: cytogenetic, C-banding, Ag-NOR technique, Geophagus.Descrição do cariótipo de Geophagus cf. proximus (Perciformes, Cichlidae, Geophaginae) RESUMO. Este estudo descreve o cariótipo de Geophagus cf. proximus. Espécimes foram coletados no lago ÁguaPreta, Parque Ambiental de Belém, Estado do Pará, Brasil. O cariótipo obtido apresentou 2n = 48 cromossomos (NF = 60: 12M/SM+36ST/A), sem diferenciação de cromossomos sexuais. O bandeamento C mostrou marcações centroméricas em todos os cromossomos. O primeiro par cromossômico, além da coloração centromérica, apresentou o braço longo totalmente heterocromático. As regiões organizadoras do nucléolo (RONs) foram estudadas por meio da coloração de AgNO 3 . As RONs foram encontradas no braço curto do segundo par de cromossomos.

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“…Although the diploid number in Doradidae vary from 56 to 66 chromosomes (Eler et al, 2007), the modal diploid number is 58 chromosomes, found in 14 out of the 16 previously analyzed species (Eler et al, 2007;Milhomem et al, 2008). According to Milhomem et al (2008), the diploid number of 58 should be considered basal to Doradidae. Thus, it is likely that the same diploid number (58) should be also considered basal for Auchenipteridae.…”

Section: Discussionmentioning

confidence: 97%

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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Cytogenetic studies in fishes of the genera Hassar, Platydoras and Opsodoras (Doradidae, Siluriformes) from Jarí and Xingú Rivers, Brazil

Cited by 21 publications

References 6 publications

Karyotypic variation of Glanidium ribeiroi Haseman, 1911 (Siluriformes, Auchenipteridae) along the Iguazu river basin

Karyotypic variation of Glanidium ribeiroi Haseman, 1911 (Siluriformes, Auchenipteridae) along the Iguazu river basin

Description of the karyotype of Geophagus cf. proximus (Perciformes, Cichlidae, Geophaginae)

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

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