Chromosome polymorphism in the Brazilian dwarf brocket deer, Mazama nana (Mammalia, Cervidae)

dc.contributorUniversidade Estadual Paulista (UNESP)
dc.creatorAbril, Vanessa Veltrini
dc.creatorDuarte, José Maurício Barbanti
dc.date2014-05-20T13:18:18Z
dc.date2014-05-20T13:18:18Z
dc.date2008-01-01
dc.date.accessioned2017-04-05T19:40:42Z
dc.date.available2017-04-05T19:40:42Z
dc.identifierGenetics and Molecular Biology. Sociedade Brasileira de Genética, v. 31, n. 1, p. 53-57, 2008.
dc.identifier1415-4757
dc.identifierhttp://hdl.handle.net/11449/4439
dc.identifier10.1590/S1415-47572008000100011
dc.identifierS1415-47572008000100011
dc.identifierWOS:000254487000011
dc.identifierS1415-47572008000100011.pdf
dc.identifierhttp://dx.doi.org/10.1590/S1415-47572008000100011
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/853726
dc.descriptionThe Brazilian dwarf brocket deer (Mazama nana) is the smallest deer species in Brazil and is considered threatened due to the reduction and alteration of its habitat, the Atlantic Rainforest. Moreover, previous work suggested the presence of intraspecific chromosome polymorphisms which may contribute to further population instability because of the reduced fertility arising from the deleterious effects of chromosome rearrangements during meiosis. We used G- and C-banding, and nucleolus organizer regions localization by silver-nitrate staining (Ag-NOR) to investigate the causes of this variation. Mazama nana exhibited eight different karyotypes (2n = 36 through 39 and FN = 58) resulting from centric fusions and from inter and intraindividual variation in the number of B chromosomes (one to six). Most of the animals were heterozygous for a single fusion, suggesting one or several of the following: a) genetic instability in a species that has not reached its optimal karyotypic evolutionary state yet; b) negative selective pressure acting on accumulated rearrangements; and c) probable positive selection pressure for heterozygous individuals which maintains the polymorphism in the population (in contrast with the negative selection for many rearrangements within a single individual).
dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.languageeng
dc.publisherSociedade Brasileira de Genética
dc.relationGenetics and Molecular Biology
dc.rightsinfo:eu-repo/semantics/openAccess
dc.subjectMazama nana
dc.subjectBrazilian dwarf brocket deer
dc.subjectCytogenetics
dc.subjectchromosome polymorphism
dc.subjectcentric fusions
dc.titleChromosome polymorphism in the Brazilian dwarf brocket deer, Mazama nana (Mammalia, Cervidae)
dc.typeOtro


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