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Volume 69, Issue 10


Sex chromosome composition revealed in Characidium fishes (Characiformes: Crenuchidae) by molecular cytogenetic methods

Marlon Pazian
  • Laboratório de Biologia e Genética de Peixes, Departamento de Morfologia, Instituto de Biocięncias, Universidade Estadual Paulista (UNESP), Distrito de Rubião Júnior S/N, Botucatu, SP, CEP 18618-000, Brasil
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/ Claudio Oliveira
  • Laboratório de Biologia e Genética de Peixes, Departamento de Morfologia, Instituto de Biocięncias, Universidade Estadual Paulista (UNESP), Distrito de Rubião Júnior S/N, Botucatu, SP, CEP 18618-000, Brasil
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/ Fausto Foresti
  • Laboratório de Biologia e Genética de Peixes, Departamento de Morfologia, Instituto de Biocięncias, Universidade Estadual Paulista (UNESP), Distrito de Rubião Júnior S/N, Botucatu, SP, CEP 18618-000, Brasil
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Published Online: 2014-11-07 | DOI: https://doi.org/10.2478/s11756-014-0434-0


The W chromosome of the fishes Characidium cf. fasciatum, Characidium sp. and Characidium cf. gomesi is heterochromatic, as is usually seen in most Characidium species. Samples of W-chromatin were collected by mechanical microdissection and amplified by DOP-PCR (degenerate oligonucleotide-primed polymerase chain reaction), to be used as painting probes (DCg and CgW) and for sequence analysis. FISH (fluorescence in situ hybridization) with DCg probe painted the whole W chromosome, the pericentromeric region of Z chromosomes and the terminal region of B chromosomes. DOP-PCR-generated fragments were cloned, sequenced and tested by in situ hybridization, but only CgW4 produced positive hybridization signals. Clone sequence analysis recovered seven distinct sequences, of which six did not reveal any similarity to other known sequences in the GenBank or GIRI databases. Only CgW9 clone sequence was recognized as probably derived from a Helitron-transposon similar to that found in the genome of the zebrafish Danio rerio. Our results show that the composition of Characidium’s W chromosome does seem rich in repetitive sequences as well as other W chromosomes found in several species with a ZW sex-determining mechanism.

Keywords: fish; W chromosome paint; repetitive DNA; female heterogamety

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About the article

Published Online: 2014-11-07

Published in Print: 2014-10-01

Citation Information: Biologia, Volume 69, Issue 10, Pages 1410–1416, ISSN (Online) 1336-9563, ISSN (Print) 0006-3088, DOI: https://doi.org/10.2478/s11756-014-0434-0.

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© 2014 Slovak Academy of Sciences. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License. BY-NC-ND 3.0

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