Abstract
In Prochilodus lineatus B-chromosomes are visualized as reduced size extra elements identified as microchromosomes and are variable in morphology and number. We describe the specific total probe (B-chromosome probe) in P. lineatus obtained by chromosome microdissection and a whole genomic probe (genomic probe) from an individual without B-chromosome. The specific B-chromosome was scraped and processed to obtain DNA with amplification by DOP-PCR, and so did the genomic probe DNA. Fluorescence in situ hybridization using the B-chromosome probe labeled with dUTP-Tetramethyl-rhodamine and the genomic probe labeled with digoxigenin-FITC permitted to establish that in this species supernumerary chromosomes with varying number and morphology had different structure of chromatin when compared to that of the regular chromosomes or A complement, since only these extra elements were labeled in the metaphases. The present findings suggest that modifications in the chromatin structure of B-chromosomes to differentiate them from the A chromosomes could occur along their dispersion in the individuals of the population.
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Acknowledgments
This work was supported by Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) and Centro de Pesquisa e Gestão de Recursos Pesqueiros Continentais (CEPTA/ICMBio). F.P.F. was granted with a fellowship from Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP).
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Voltolin, T.A., Laudicina, A., Senhorini, J.A. et al. Origin and molecular organization of supernumerary chromosomes of Prochilodus lineatus (Characiformes, Prochilodontidae) obtained by DNA probes. Genetica 138, 1133–1139 (2010). https://doi.org/10.1007/s10709-010-9502-8
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DOI: https://doi.org/10.1007/s10709-010-9502-8