Chromosome Studies in Hypoptopomatinae (Pisces, siluriformes, Loricariidae): I. XX/XY Sex Chromosome Heteromorphism in Pseudotocinclus tietensis.

Andreata, Artur Antonio; Almeida-Toledo, Lurdes Foresti de; Oliveira, Claudio; Filho, Sílvio de Almeida Toledo

doi:10.1508/cytologia.57.369

Cited by 44 publications

(36 citation statements)

References 12 publications

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“…The same diploid number and interstitial Ag-NORs have being found in almost all species of Hypoptopomatinae (Andreata et al, 1992;Andreata et al, 1993;Andreata et al, 1994), reinforcing the hypothesis that 64 Cytogenetic studies on Hisonotus this group is karyotypically very conserved (Andreata et al, 1994). Although the species of the subfamily Hypoptopomatinae show a similar karyotypic macrostructure, the Cbanding pattern has been useful in distinguishing species limits and determining local samples of some species (Andreata et al, 1993).…”

Section: Discussionmentioning

confidence: 82%

Karyological characterization of four Neotropical fish species of the genus Hisonotus (Teleostei, Loricariidae, Hypoptopomatinae) from distinct Brazilian river basins

Andreata¹,

Oliveira

Foresti

2006

Genet. Mol. Biol.

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The karyotypes of four Hisonotus species (two provisionally-named species A and D, H. nigricauda, and H. leucofrenatus) were found to have the same diploid number of 2n = 54 and interstitial silver-staining nucleolus organizer regions (Ag-NORs) located on the long arm of the largest metacentric pair. The C-banding pattern appeared to be species-specific, with one group (H. nigricauda and the unnamed species A and D) being characterized by small amounts of positive C-banded segments and containing a sub-group (species A and D) identified by a large positive C-banded segment on a small metacentric chromosome pair. The second group contained different samples of H. leucofrenatus, characterized by a larger amount of C-band positive segments spread over several chromosome arms. Heterochromatin appears to play an important evolutionary role in chromosome differentiation in Hisonotus species, especially in H. leucofrenatus. The geographic isolation of several H. leucofrenatus populations seems to have favored chromosome evolution of each sample analyzed.

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Section: Discussionmentioning

confidence: 82%

Karyological characterization of four Neotropical fish species of the genus Hisonotus (Teleostei, Loricariidae, Hypoptopomatinae) from distinct Brazilian river basins

Andreata¹,

Oliveira

Foresti

2006

Genet. Mol. Biol.

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“…It also differs from closely related taxonomic groups, like most species analyzed in the subfamily Hypoptopomatinae (Andreata et al, 1992(Andreata et al, , 1993(Andreata et al, , 2006 and in the tribe Pterygoplichthini (Alves et al, 2006).…”

Section: Discussionmentioning

confidence: 91%

“…Besides Ancistrus, other Loricariidae genera also present species with sex chromosome systems, such as Hypostomus (Michele et al, 1977;Artoni et al, 1998), Microlepidogaster and Pseudotocinclus (Andreata et al, 1992(Andreata et al, , 1993, Table 1. Analyzed Ancistrus species with their respective hydrographic basins and locality.…”

Section: Discussionmentioning

confidence: 99%

Diversity and chromosomal evolution in the genus Ancistrus Kner, 1854 (Loricariidae: Ancistrini) from three hydrographic basins of Mato Grosso State, Brazil

2013

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Cytogenetic analyses were carried out in 117 specimens of seven species of the genus Ancistrus from three hydrographic in Mato Grosso State: Paraguay, Araguaia-Tocantins and Amazon basins. Conventional cytogenetic techniques were used to obtain mitotic chromosomes. C-banding was performed to detect heterochromatic regions and silver nitrate staining was used to identify nucleolar organizer regions (Ag-NORs). The counted and paired chromosomes revealed diploid numbers ranging from 2n = 40 to 2n = 54 with karyotype formulae varying from FN = 80 to FN = 86. Single marks in distinct chromosomes identified the nucleolar organizer regions. The constitutive heterochromatin was scarce in the diploid number from 2n = 50 to 2n = 54 and conspicuous blocks were observed in a single species with 2n = 40 chromosomes. These data corroborate the hypotheses of reduction of diploid number in species with derived features such as presence of sex chromosomes and polymorphisms, besides allowing inferences about the evolutionary mechanisms and the ancestor karyotype that favored the diversification of this important genus in the tribe Ancistrini. Foram realizadas análises citogenéticas de 117 espécimes do gênero Ancistrus de três bacias hidrográficas do estado de MatoGrosso: Paraguai, Araguaia-Tocantins e Amazônica, utilizando as técnicas de citogenética convencional para obtenção de cromossomos mitóticos, visualização de regiões heterocromáticas e regiões organizadoras de nucléolos. Os cromossomos pareados revelaram uma variação no número diploide de 2n = 40 a 2n = 54 e número fundamental de NF = 80 a NF = 86. As regiões organizadoras de nucléolos foram evidenciadas em um único par de cromossomos para todas as espécies e a heterocromatina é escassa nas espécies com números diploides elevados (2n = 50 a 2n = 54). Os blocos heterocromáticos mais evidentes foram observados nos pares portadores das AgRONs e em cromossomos da espécie com 2n = 40. Estes dados contribuem para a hipótese de redução do número diploide nas espécies que apresentam polimorfismos cromossômicos e cromossomos sexuais, além de contribuir para inferências sobre os mecanismos de evolução cariotípica que favoreceu a diversificação do gênero Ancistrus, o mais representativo na tribo Ancistrini.

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“…The same occurs with heteromorphic sex chromosomes in this family. Male and female heterogamety, such as the XX/XY and ZZ/ZW systems, have already been identified for some Loricariidae (Michelle et al, 1977;Andreata et al, 1992Andreata et al, , 1993Andreata et al, , 1994Scavone and Jú lio Jr, 1995;Artoni et al, 1998), but represent isolated events in this group.…”

Section: Discussionmentioning

confidence: 91%

Karyotypic diversity and evolution of Loricariidae (Pisces, Siluriformes)

et al. 2004

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We present cytogenetic analyses of four fish species, belonging to four Loricariidae subfamilies: Neoplecostomus microps (Neoplecostominae) with 2n ¼ 54 chromosomes, Harttia loricariformis (Loricariinae) with 2n ¼ 56 chromosomes, Hypostomus affinis (Hypostominae) with 2n ¼ 66 chromosomes and Upsilodus sp. (Upsilodinae), with 2n ¼ 96 chromosomes. In addition to karyotypes, data on the location of 18s rDNA sites are presented, derived from indirect (silver nitrate impregnation) and direct (FISH) methods. There is only one pair of nucleolar organizing regions (NORs) per species, except in H. affinis. Diversity and NOR macrokaryotypic evolution in the species analyzed are discussed in relation to the evolution of the Loricariidae as a whole. In addition, a revision of the cytogenetic data available for this family is presented.

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Chromosome Studies in Hypoptopomatinae (Pisces, siluriformes, Loricariidae): I. XX/XY Sex Chromosome Heteromorphism in Pseudotocinclus tietensis.

Cited by 44 publications

References 12 publications

Karyological characterization of four Neotropical fish species of the genus Hisonotus (Teleostei, Loricariidae, Hypoptopomatinae) from distinct Brazilian river basins

Karyological characterization of four Neotropical fish species of the genus Hisonotus (Teleostei, Loricariidae, Hypoptopomatinae) from distinct Brazilian river basins

Diversity and chromosomal evolution in the genus Ancistrus Kner, 1854 (Loricariidae: Ancistrini) from three hydrographic basins of Mato Grosso State, Brazil

Karyotypic diversity and evolution of Loricariidae (Pisces, Siluriformes)

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