First report of a B chromosome in a natural population of Astyanax altiparanae (Characiformes, Characidae)

Hashimoto, Diogo Teruo; Gonçalves, Vanessa Regina; Bortolozzi, Jehud; Foresti, Fausto; Porto‐Foresti, Fábio

doi:10.1590/s1415-47572008000200021

Cited by 21 publications

(19 citation statements)

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“…The analysis of constitutive heterochromatin patterns showed heterochromatic blocks in the pericentromeric regions of most chromosomes and evident signals in the terminal regions of some chromosomes (Figure 2), similar to those found in other populations of A. bockmanni (Kavalco et al 2009;Hashimoto and Porto-Foresti 2010). In relation to the B chromosomes, all three morphological variants (B M , B m , and B a ) were identified as heterochromatic (Figure 2), in accordance with a common characteristic reported for B chromosomes in the genus Astyanax (Néo et al 2000;Moreira-Filho et al 2001;Hashimoto et al 2008;Machado et al 2012).…”

Section: Resultssupporting

confidence: 87%

Cytogenetic characterization of distinct B chromosomes in a population of the fish Astyanax bockmanni (Teleostei, Characiformes)

et al. 2012

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Individuals of Astyanax bockmanni from one population belonging to the Paranapanema River basin, southeastern Brazil, were cytogenetically examined. In the present paper, we report a diploid number of 50 chromosomes, with some individuals bearing additional chromosomes, characterized as different variants of B chromosomes. The B microchromosome of acrocentric morphology (B a ) was the most frequent type in this population (77.7%). Two other variants were identified as metacentric B chromosomes, but of distinct sizes, characterized as macrochromosome (B M ) and microchromosome (B m ). Conspicuous heterochromatic blocks were observed in the terminal regions of some chromosomes of the standard karyotype and partially heterochromatic blocks were detected in all B chromosomes. 18S ribosomal RNA genes were distributed in the terminal region of several chromosomes, but were not located on the B chromosomes.

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Section: Resultssupporting

confidence: 87%

Cytogenetic characterization of distinct B chromosomes in a population of the fish Astyanax bockmanni (Teleostei, Characiformes)

et al. 2012

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“…However, Voltolin et al (2011) recently detected the presence of eight and nine supernumerary chromosomes in individuals of this species resulting from induced crossings. Supernumerary chromosomes exhibit a remarkable variation in size and morphology among fish, i.e., the occurrence of large genomic elements as macrochromosomes was described in species of the genus Astyanax (Maistro et al 1992, Salvador and Moreira-Filho 1992, Vicente et al 1996, Moreira-Filho et al 2001, Ferro et al 2003, Hashimoto et al 2008; of medium size in Rhamdia Bertollo 1990, Fenocchio et al 2000); and also as small elements identified as microchromosomes in Prochilodus (Pauls and Bertollo 1983, Venere et al 1999, Cavallaro et al 2000, Oliveira et al 2003, Voltolin et al 2009). Artoni et al (2006), studying specimens of P. lineatus from the Mogi-Guaçu River, observed the presence of three types of supernumerary microchromosomes in this species, which were classified as B-acrocentric, B-metacentric, and B-submetacentric.…”

Section: -1377mentioning

confidence: 99%

Transmission rate variation among three B chromosome variants in the fish Prochilodus lineatus (Characiformes, Prochilodontidae)

Penitente

Voltolin

Senhorini

et al. 2013

An. Acad. Bras. Ciênc.

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Cytogenetic studies were developed in Prochilodus lineatus (Valenciennes 1836), describing an interesting system of small supernumerary chromosomes. The purpose of this work is to study the frequency and morphology of B chromosomes in individuals from the parental line and the inheritance patterns of these elements in individuals obtained from controlled crosses in the species P. lineatus. The transmission rate of B chromosomes revealed a k B =0.388 for the acrocentric type, a kB=0.507 for the metacentric type and a k B =0.526 for the submetacentric type. The obtained results raise hypothesis that B-acrocentric chromosomes are involved in an extinction process in this species, while the metacentric and submetacentric supernumerary elements comprises a neutral mechanism and follows a Mendelian transmission rate.

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“…Therefore, little is known about the karyotype structure of this group, and the literature is practically limited to the genus Astyanax (Baird and Girard, 1854), for which a wide numeric and morphologic variability is very evident (Pazza et al, 2006;Hashimoto et al, 2008;Kantek et al, 2008;among others).…”

Section: Introductionmentioning

confidence: 99%

Karyotype diversity of four species of the incertae sedis group (Characidae) from different hydrographic basins: analysis of AgNORs, CMA3 and 18S rDNA

Mm¹,

R²,

Giuliano-Caetano³

et al. 2011

Genet. Mol. Res.

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ABSTRACT.A large number of genera in the tropical fish family Characidae are incertae sedis. Cytogenetic analysis was made of four of these species: Astyanax eigenmanniorum, Deuterodon stigmaturus, Hyphessobrycon luetkenii, and H. anisitsi, collected from various hydrographic basins: hydrographic system from Laguna dos Patos/RS, Tramandaí basin/RS and Tibagi River basin/PR. The first two species were collected in their type locality in the State of Rio Grande do Sul. The 2n = 48 karyotype was observed only in A. eigenmanniorum, while the other species had 2n = 50 chromosomes, with different karyotypic formulas. There was weak heterochromatin staining in the pericentromeric region of A. eigenmanniorum, D. stigmaturus and H. luetkenni chromosomes. In H. anisitsi, heterochromatin appeared to be more abundant and distributed in the pericentromeric and terminal regions of the chromosomes; three pairs showed more evident heterochromatic blocks. There were multiple Ag-NORs in all populations, visualized by FISH with an 18S rDNA probe. While D. stigmaturus and H. luetkenii ©FUNPEC-RP www.funpecrp.com.br Genetics and Molecular Research 10 (4): 3596-3608 (2011) Karyotype diversity of an incertae sedis group in Characidae 3597 had conserved AgNOR, CMA 3 and 18S rDNA sites, the other two species showed intra-and interindividual variation at these sites. The karyotype variability was high, as is common in this group of fish. Different species arising from isolated hydrographic basins maintain an elevated level of karyotype differentiation, mainly with respect to chromosome structure, heterochromatin distribution and rDNA localization. This is the first report with cytogenetic data for D. stigmaturus and H. luetkenii.

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First report of a B chromosome in a natural population of Astyanax altiparanae (Characiformes, Characidae)

Cited by 21 publications

References 20 publications

Cytogenetic characterization of distinct B chromosomes in a population of the fish Astyanax bockmanni (Teleostei, Characiformes)

Cytogenetic characterization of distinct B chromosomes in a population of the fish Astyanax bockmanni (Teleostei, Characiformes)

Transmission rate variation among three B chromosome variants in the fish Prochilodus lineatus (Characiformes, Prochilodontidae)

Karyotype diversity of four species of the incertae sedis group (Characidae) from different hydrographic basins: analysis of AgNORs, CMA3 and 18S rDNA

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