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dc.contributor.authorViana, Patrik Ferreira-
dc.contributor.authorEzaz, Tariq Tariq-
dc.contributor.authorMarajó, Leandro-
dc.contributor.authorFerreira, Milena-
dc.contributor.authorZuanon, Jansen-
dc.contributor.authorCioffi, Marcelo de Bello-
dc.contributor.authorBertollo, Luiz Antônio Carlos-
dc.contributor.authorGross, Maria Claudia-
dc.contributor.authorFeldberg, Eliana-
dc.date.accessioned2020-06-15T21:37:52Z-
dc.date.available2020-06-15T21:37:52Z-
dc.date.issued2018-
dc.identifier.urihttps://repositorio.inpa.gov.br/handle/1/16988-
dc.description.abstractThe genus Colomesus is the sole representative of the family Tetraodontidae in the Amazon region. Here, Colomesus asellus was analyzed using conventional and molecular cytogenetic protocols. Its diploid chromosome number is 2n = 46 with 12 meta-, 10 submeta-, 16 subtelo-, and 8 acrocentric chromosomes and a fundamental number of FN = 84. An XX/XY sex chromosome system was identified. Mapping of 18S rDNA correlated with the nucleolus organizer regions (Ag-NORs) in the short arms of the 2 X chromosomes in females and in the Y chromosome in males. C-banding revealed heterochromatin in the centromeric regions of all chromosomes, except for pair 3. Prominent sex chromosome-specific heterochromatin amplification was observed, covering the short arms of the Y chromosome almost entirely. FISH with telomeric and tropomyosin (tpm1) sequences, respectively, revealed terminal signals in all chromosomes. The analysis of extended DNA fibers confirmed the colocalization and the interspersed pattern of the telomeric and tpm1 sequences. Thus, this study highlights the remarkable evolutionary dynamism presented by the Amazonian puffer fish regarding the differentiation of a heteromorphic XY sex chromosome system and a particular sex-specific amplification of rDNA sites. This is the first record of such an association in the Tetraodontidae family. © 2018 S. Karger AG, Basel.en
dc.language.isoenpt_BR
dc.relation.ispartofVolume 153, Número 2, Pags. 96-104pt_BR
dc.rightsRestrito*
dc.subjectDna 18sen
dc.subjectRepetitive Dnaen
dc.subjectTropomyosinen
dc.subjectCell Nucleus Antigenen
dc.subjectNucleolar Organizer Region Associated Proteinsen
dc.subjectRibosome Dnaen
dc.subjectRna 18sen
dc.subjectTropomyosinen
dc.subjectAcrocentric Chromosomeen
dc.subjectC Bandingen
dc.subjectChromosome Noren
dc.subjectChromosome Numberen
dc.subjectCytogeneticsen
dc.subjectDiploidyen
dc.subjectFemaleen
dc.subjectIn Situ Hybridization, Fluorescenceen
dc.subjectHeterochromatinen
dc.subjectKaryotypeen
dc.subjectMaleen
dc.subjectNonhumanen
dc.subjectPriority Journalen
dc.subjectPuffer Fishen
dc.subjectSex Chromosomeen
dc.subjectTelomereen
dc.subjectX Chromosomeen
dc.subjectY Chromosomeen
dc.subjectAnimalsen
dc.subjectChromosome Banding Patternen
dc.subjectGene Amplificationen
dc.subjectGeneticsen
dc.subjectNucleotide Repeaten
dc.subjectSex Chromosomeen
dc.subjectSex Determination Processesen
dc.subjectTetraodontiformesen
dc.subjectUltrastructureen
dc.subjectAnimalen
dc.subjectAntigens, Nuclearen
dc.subjectChromosome Bandingen
dc.subjectRibosomal Dnaen
dc.subjectFemaleen
dc.subjectGene Amplificationen
dc.subjectIn Situ Hybridization, Fluorescenceen
dc.subjectMaleen
dc.subjectRepetitive Sequences, Nucleic Aciden
dc.subjectRna, Ribosomal, 18sen
dc.subjectSex Chromosomesen
dc.subjectSex Determination Processesen
dc.subjectTelomereen
dc.subjectTetraodontiformesen
dc.subjectTropomyosinen
dc.titleGenomic Organization of Repetitive DNAs and Differentiation of an XX/XY Sex Chromosome System in the Amazonian Puffer Fish, Colomesus asellus (Tetraodontiformes)en
dc.typeArtigopt_BR
dc.identifier.doi10.1159/000484423-
dc.publisher.journalCytogenetic and Genome Researchpt_BR
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