Differentiation of the XY Sex Chromosomes in the Fish Hoplias malabaricus (Characiformes, Erythrinidae): Unusual Accumulation of Repetitive Sequences on the X Chromosome

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dc.contributor.authorCioffi, M. B.
dc.contributor.authorMartins, C. [UNESP]
dc.contributor.authorVicari, M. R.
dc.contributor.authorRebordinos, L.
dc.contributor.authorBertollo, L. A. C.
dc.contributor.institutionUniversidade Federal de São Carlos (UFSCar)
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversidade Estadual de Ponta Grossa (UEPG)
dc.contributor.institutionUniv Cadiz
dc.date.accessioned2014-05-20T13:52:01Z
dc.date.available2014-05-20T13:52:01Z
dc.date.issued2010-01-01
dc.description.abstractThe wolf fish Hoplias malabaricus (Erythrinidae) presents a high karyotypic diversity, with 7 karyomorphs identified. Karyomorph A is characterized by 2n = 42 chromosomes, without morphologically differentiated sex chromosomes. Karyomorph B also has 2n = 42 chromosomes for both sexes, but differs by a distinct heteromorphic XX/XY sex chromosome system. The cytogenetic mapping of 5 classes of repetitive DNA indicated similarities between both karyomorphs and the probable derivation of the XY chromosomes from pair No. 21 of karyomorph A. These chromosomes appear to be homeologous since the distribution of (GATA)(n) sequences, 18S rDNA and 5SHindIII-DNA sites supports their potential relatedness. Our data indicate that the differentiation of the long arms of the X chromosome occurred by accumulation of heterochromatin and 18S rDNA cistrons from the ancestral homomorphic pair No. 21 present in karyomorph A. These findings are further supported by the distribution of the Cot-1 DNA fraction. In addition, while the 18S rDNA cistrons were maintained and amplified on the X chromosomes, they were lost in the Y chromosome. The X chromosome was a clearly preferred site for the accumulation of DNA repeats, representing an unusual example of an X clustering more repetitive sequences than the Y during sex chromosome differentiation in fish. Copyright (C) 2010 S. Karger AG, Baselen
dc.description.affiliationUniversidade Federal de São Carlos (UFSCar), Dept Genet Evolucao, BR-13565905 São Carlos, SP, Brazil
dc.description.affiliationUniv Estadual Paulista, Inst Biociencias, Dept Morfol, Botucatu, SP, Brazil
dc.description.affiliationUniversidade Estadual de Ponta Grossa (UEPG), Dept Biol Estrutural Mol Genet, Ponta Grossa, Brazil
dc.description.affiliationUniv Cadiz, Fac Ciencias Mar & Ambient, Genet Lab, Puerto Real, Spain
dc.description.affiliationUnespUniv Estadual Paulista, Inst Biociencias, Dept Morfol, Botucatu, SP, Brazil
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.description.sponsorshipFundação Araucária de Apoio ao Desenvolvimento Científico e Tecnológico do Paraná (FAADCT/PR)
dc.description.sponsorshipIdFAPESP: 07/05565-5
dc.description.sponsorshipIdCAPES: 083/2007
dc.description.sponsorshipIdFundação Araucaria: 17217
dc.format.extent176-185
dc.identifierhttp://dx.doi.org/10.1159/000309726
dc.identifier.citationSexual Development. Basel: Karger, v. 4, n. 3, p. 176-185, 2010.
dc.identifier.doi10.1159/000309726
dc.identifier.issn1661-5425
dc.identifier.lattes8858800699425352
dc.identifier.orcid0000-0003-3534-974X
dc.identifier.urihttp://hdl.handle.net/11449/18583
dc.identifier.wosWOS:000278967300006
dc.language.isoeng
dc.publisherKarger
dc.relation.ispartofSexual Development
dc.relation.ispartofjcr1.913
dc.relation.ispartofsjr1,114
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjectCot-1 DNAen
dc.subjectFishesen
dc.subjectHeterochromatin accumulationen
dc.subjectMolecular cytogeneticsen
dc.subjectRepetitive DNAen
dc.subjectSex chromosome differentiationen
dc.titleDifferentiation of the XY Sex Chromosomes in the Fish Hoplias malabaricus (Characiformes, Erythrinidae): Unusual Accumulation of Repetitive Sequences on the X Chromosomeen
dc.typeResumo
dcterms.licensehttp://www.karger.com/Services/RightsPermissions
dcterms.rightsHolderKarger
unesp.author.lattes8858800699425352[2]
unesp.author.orcid0000-0001-6255-9449[4]
unesp.author.orcid0000-0003-3913-9889[3]
unesp.author.orcid0000-0003-3534-974X[2]
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Biociências, Botucatupt

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