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dc.contributor.authorGunski, R. J-
dc.contributor.authorKretschmer, R-
dc.contributor.authorSouza, M. Santos de-
dc.contributor.authorFuro, I. de Oliveira-
dc.contributor.authorBarcelos, S. A-
dc.contributor.authorCosta, A. L-
dc.contributor.authorCioffi, M. B-
dc.contributor.authorOliveira, Edivaldo Herculano Correa de-
dc.contributor.authorGarnero, A. del Valle-
dc.date.accessioned2019-08-09T13:06:45Z-
dc.date.available2019-08-09T13:06:45Z-
dc.date.issued2019-
dc.identifier.citationGUNSKI, R. J. et al. Evolution of bird sex chromosomes narrated by repetitive sequences: unusual W chromosome enlargement in Gallinula melanops (Aves: Gruiformes: Rallidae). Cytogenetic and Genome Research, v. xx, n. xx, p. xx, 2019.pt_BR
dc.identifier.issn1424-859X-
dc.identifier.urihttp://patua.iec.gov.br//handle/iec/3820-
dc.description.abstractAmong birds, species with the ZZ/ZW sex determination system generally show significant differences in morphology and size between the Z and W chromosomes (with the W usually being smaller than the Z). In the present study, we report for the first time the karyotype of the spot-flanked gallinule (Gallinula melanops) by means of classical and molecular cytogenetics. The spot-flanked gallinule has 2n = 80 (11 pairs of macrochromosomes and 29 pairs of microchromosomes) with an unusual W chromosome that is larger than the Z. Besides being totally heterochromatic, it has a secondary constriction in its long arm corresponding to the nucleolar organizer region, as confirmed by both silver staining and mapping of 18S rDNA probes. This is an unprecedented fact among birds. Additionally, 18S rDNA sites were also observed in 6 microchromosomes, while 5S rDNA was found in just 1 microchromosomal pair. Seven out of the 11 used microsatellite sequences were found to be accumulated in microchromosomes, and 6 microsatellite sequences were found in the W chromosome. In addition to the involvement of heterochromatin and repetitive DNAs in the differentiation of the large W chromosome, the results also show an alternative scenario that highlights the plasticity that shapes the evolutionary history of bird sex chromosomes.pt_BR
dc.language.isoengpt_BR
dc.publisherKarger Publisherspt_BR
dc.rightsAcesso Embargadopt_BR
dc.titleEvolution of bird sex chromosomes narrated by repetitive sequences: unusual W chromosome enlargement in Gallinula melanops (Aves: Gruiformes: Rallidae)pt_BR
dc.typeArtigopt_BR
dc.subject.decsPrimaryAves / anatomia & histologiapt_BR
dc.subject.decsPrimaryAves / genéticapt_BR
dc.subject.decsPrimaryCromossomos Sexuais / genética
dc.subject.decsPrimaryAnálise Citogenética / veterináriapt_BR
dc.subject.decsPrimaryRepetições de Microssatélites / genéticapt_BR
dc.subject.decsPrimaryGallinula melanopspt_BR
dc.creator.affilliationUniversidade Federal do Pampa. Programa de Pós-Graduação em Ciências Biológicas. São Gabriel, RS, Brazil.pt_BR
dc.creator.affilliationUniversidade Federal do Rio Grande do Sul. Programa de Pós-Graduação em Genética e Biologia Molecular. Porto Alegre, RS, Brazil.pt_BR
dc.creator.affilliationUniversidade Federal do Pampa. Programa de Pós-Graduação em Ciências Biológicas. São Gabriel, RS, Brazil.pt_BR
dc.creator.affilliationUniversidade Federal do Pará. Programa de Pós-Graduação em Genética e Biologia Molecular. Belém, PA, Brazil.pt_BR
dc.creator.affilliationUniversidade Federal do Pampa. Programa de Pós-Graduação em Ciências Biológicas. São Gabriel, RS, Brazil.pt_BR
dc.creator.affilliationUniversidade Federal do Pampa. Graduação em Ciências Biológicas. São Gabriel, RS, Brazil.pt_BR
dc.creator.affilliationUniversidade Federal de São Carlos. Departamento de Genética e Evolução. São Carlos, SP, Brazil.pt_BR
dc.creator.affilliationUniversidade Federal do Pará. Instituto de Ciências Exatas e Naturais. Belém, PA, Brazil / Ministério da Saúde. Secretaria de Vigilância em Saúde. Instituto Evandro Chagas. Laboratório de Cultura de Tecidos e Citogenética. Ananindeua, PA, Brasil.pt_BR
dc.creator.affilliationUniversidade Federal do Pampa. Programa de Pós-Graduação em Ciências Biológicas. São Gabriel, RS, Brazil.pt_BR
dc.identifier.doi10.1159/000501381-


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