B-chromosome frequency stability in Prochilodus lineatus (Characiformes, Prochilodontidae)

Voltolin, Tatiana Aparecida; Senhorini, José Augusto; Oliveira, Cláudio; Foresti, Fausto; Bortolozzi, Jehud; Porto‐Foresti, Fábio

doi:10.1007/s10709-009-9420-9

Cited by 7 publications

(8 citation statements)

References 26 publications

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“…These data are consistent with those described by Cavallaro et al [2000], Oliveira et al [1997], and Voltolin et al [2009], who studied B chromosomes in P. lineatus from the Mogi-Guaçu River and suggested a stable frequency ( table 1 ). In contrast, intraindividual variation was not found in our study, as was previously proposed by Oliveira et al [1997] and Cavallaro et al [2000] and confirmed by Voltolin et al [2010b]. Nevertheless, the stabilization of B chromosome frequencies in P. lineatus does not apply to all the variant forms.…”

Section: Resultssupporting

confidence: 73%

Transmission Behavior of B Chromosomes in Prochilodus lineatus (Characiformes, Prochilodontidae)

Penitente

Daniel²,

Senhorini³

et al. 2015

Cytogenet Genome Res

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The population of Prochilodus lineatus found in the Mogi-Guaçu River is karyotypically polymorphic, carrying acrocentric, metacentric, and submetacentric B chromosomes. The analysis of each B chromosome frequency in this species revealed a variation in the distribution pattern, with the metacentric type having the highest frequency (73.30%), followed by submetacentric (25.22%) and acrocentric B chromosomes (1.48%). The transmission pattern of the supernumerary chromosomes was identified by controlled crosses, and it was shown that the acro- and submetacentric B chromosomes have a transmission pattern below the Mendelian rate (k_B = 0.333 and k_B = 0.385, respectively), but the metacentric variant has a cumulative transmission pattern (k_B = 0.587). These results indicate that the acro- and submetacentric B chromosomes are undergoing an extinction process, while the metacentric B chromosomes appear to be accumulating in frequency with each generation.

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Section: Resultssupporting

confidence: 73%

Transmission Behavior of B Chromosomes in Prochilodus lineatus (Characiformes, Prochilodontidae)

Penitente

Daniel²,

Senhorini³

et al. 2015

Cytogenet Genome Res

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“…To date, the cytogenetic data of Neotropical fishes have shown some major trends: karyotypic stability in Anostomidae [ 57 , 58 ], Prochilodontidae [ 58 , 59 – 61 ], and Curimatidae [ 57 , 62 ], and the existence of species complexes in the genera Astyanax [ 63 ] and Hoplias [ 64 ]. However, the cytogenetic pattern observed in bryconine from Brazilian southeastern coastal basins represents the first case in which synapomorphies of chromosomal banding show monophyly of well-defined morphological species.…”

Section: Discussionmentioning

confidence: 99%

Cytogenetic and Molecular Data Demonstrate that the Bryconinae (Ostariophysi, Bryconidae) Species from Southeastern Brazil Form a Phylogenetic and Phylogeographic Unit

et al. 2015

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Brycon spp. occur in Neotropical watersheds to the west and east of the Andes, and as they are sensitive to anthropogenic changes, many these species are endangered in southeastern Brazil. Coastal rivers in southeastern Brazil are characterized by the presence of relatively few freshwater fish species and high endemism of this fauna. The objective of this study was to examine whether Brycon spp. occurring in the coastal basins of southeastern Brazil are monophyletic, using cytogenetic data, mitochondrial, and nuclear molecular markers. All the species showed a diploid number of 50 chromosomes, a conserved number within the subfamily Bryconinae. However, the karyotypic formulas were unique to most species, including Brycon devillei (26m+22sm+2st), Brycon ferox (26m+12sm+12st), Brycon insignis (22m+20sm+8st), Brycon opalinus, and Brycon vermelha (24m+20sm+6st), indicating the prevalence of pericentric and paracentric inversions in the chromosomal evolution of these species. All of them had nucleolar organizer regions in the first pair of subtelocentric chromosomes and no equilocal distribution of heterochromatin in the first pair of chromosomes of the karyotype. These two features, not seen in any other Brycon spp. examined to date, indicate that Bryconinae species from the Brazilian southeastern coastal basins, including the monotypic genus Henochilus, are monophyletic. Also, this is the first study that reports NOR location and C-banding patterns as synapomorphies for a Neotropical fish species group. The monophyly was also supported by a phylogenetic analysis of 16S rDNA (16S), cytochrome oxidase subunit I (COI), alpha-myosin (MYH6) genes and S72 intron molecular data. Our results partially corroborate the “Brycon acuminatus” group proposed by Howes in 1982: our proposed clade keeps B. devillei, B. ferox, and B. insignis; but it also includes B. opalinus, B. vermelha, and H. weatlandii whereas it excludes B. nattereri. The phylogeographic unit formed by Bryconinae species in southeastern Brazil reflects the long and isolated paleohydrological history of these coastal basins relative to the continental watersheds.

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“…In fish, the possibility of neutralization through mitotic stabilization of B-chromosomes was also observed in Prochilodus lineatus , in the population from the Mogi-Guaçu River (Brazil) ( Oliveira et al 1997 ). Afterwards, in this same population, Cavallaro et al (2000) found a drastic temporal decline in the degree of B mitotic instability; Voltolin et al (2010) showed that the stabilization process was continuous for over 15 years; and currently, the population of Prochilodus lineatus from the Mogi-Guaçu River presents a total mitotic stability index (MI = 0) and the B chromosomes were considered completely neutralized.…”

Section: Resultsmentioning

confidence: 89%

Cytogenetic analysis of B chromosomes in one population of the fish Moenkhausia sanctaefilomenae (Steindachner, 1907) (Teleostei, Characiformes)

Hashimoto¹,

Voltolin²,

Paes³

et al. 2012

CCG

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The aim of this study was to characterize cytogenetically one population of the fish Moenkhausia sanctaefilomenae (Steindachner, 1907), with emphasis on the analysis of B chromosomes. The nucleolar activity in the B microchromosomes was characterized, and an analysis of mitotic instability of these microchromosomes was accomplished. The results showed a diploid chromosome number of 50 chromosomes. In all individuals, we observed the presence of B microchromosomes with intra- and inter-individual variability. The analysis of the nucleolus organizing regions (NORs) by silver nitrate staining demonstrated multiple NORs. We observed active sites of ribosomal DNA in the B microchromosomes, with a frequency of 20% in the analyzed cells, which shows gene activity in these chromosomal elements. The analysis of constitutive heterochromatin patterns showed that the B microchromosomes are heterochromatic or euchromatic, which demonstrates differentiation of DNA composition between these genomic elements. The calculation of the mitotic instability index implied that B chromosomes in this species might be in a final stage of instability.

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B-chromosome frequency stability in Prochilodus lineatus (Characiformes, Prochilodontidae)

Cited by 7 publications

References 26 publications

Transmission Behavior of B Chromosomes in <b><i>Prochilodus lineatus </i></b>(Characiformes, Prochilodontidae)

Transmission Behavior of B Chromosomes in <b><i>Prochilodus lineatus </i></b>(Characiformes, Prochilodontidae)

Cytogenetic and Molecular Data Demonstrate that the Bryconinae (Ostariophysi, Bryconidae) Species from Southeastern Brazil Form a Phylogenetic and Phylogeographic Unit

Cytogenetic analysis of B chromosomes in one population of the fish Moenkhausia sanctaefilomenae (Steindachner, 1907) (Teleostei, Characiformes)

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