Accentuated polymorphism of heterochromatin and nucleolar organizer regions in Astyanax scabripinnis (Pisces, Characidae): tools for understanding karyotypic evolution

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dc.contributor.authorMantovani, M.
dc.contributor.authorAbel, LDD
dc.contributor.authorMestriner, C. A.
dc.contributor.authorMoreira, O.
dc.contributor.institutionUniversidade Federal de São Carlos (UFSCar)
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2014-05-20T13:24:37Z
dc.date.available2014-05-20T13:24:37Z
dc.date.issued2000-01-01
dc.description.abstractAstyanax scabripinnis has been considered a species complex because it presents high karyotypic and morphological variability among its populations. In this work, individuals of two A. scabripinnis populations from different streams in the same hydrographic basin were analyzed through C-banding and AgNOR. Although they present distinct diploid numbers, they show meta and submetacentric chromosome groups highly conserved (numerically and morphologically). Other chromosomal characteristics are also shared by both populations, as the pattern of constitutive heterochromatin distribution (large blocks in the telomeric regions of subtelocentric and acrocentric chromosomes) and some nucleolar chromosomes. Inter-individual variations both in the number and size of heterochromatic blocks, and in the number and localization of NORs were verified in the studied populations, characterizing them as polymorphics for these regions. The mechanisms involved in the dispersion of heterochromatin and NORs through the karyotypes, as well as the possible events related to the generation of polymorphism of those regions are discussed. Furthermore, relationships between these populations and within the context of the scabripinnis complex are also approached.en
dc.description.affiliationUniv Fed Sao Carlos, Dept Genet & Evolucao, BR-13565905 Sao Carlos, SP, Brazil
dc.description.affiliationUNESP, Fac Ciências Farmaceut, Dept Ciências Biol, BR-14801902 Araraquara, SP, Brazil
dc.description.affiliationUnespUNESP, Fac Ciências Farmaceut, Dept Ciências Biol, BR-14801902 Araraquara, SP, Brazil
dc.format.extent161-168
dc.identifierhttp://dx.doi.org/10.1023/A:1017546601065
dc.identifier.citationGenetica. Dordrecht: Kluwer Academic Publ, v. 109, n. 3, p. 161-168, 2000.
dc.identifier.doi10.1023/A:1017546601065
dc.identifier.issn0016-6707
dc.identifier.urihttp://hdl.handle.net/11449/7699
dc.identifier.wosWOS:000169127000002
dc.language.isoeng
dc.publisherKluwer Academic Publ
dc.relation.ispartofGenetica
dc.relation.ispartofjcr1.366
dc.relation.ispartofsjr0,649
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjectAstyanax scabripinnispt
dc.subjectconstitutive heterochromatinpt
dc.subjectkaryotypic evolutionpt
dc.subjectnucleolar organizer regions (NORs)pt
dc.subjectpolymorphismpt
dc.titleAccentuated polymorphism of heterochromatin and nucleolar organizer regions in Astyanax scabripinnis (Pisces, Characidae): tools for understanding karyotypic evolutionen
dc.typeArtigo
dcterms.licensehttp://www.springer.com/open+access/authors+rights
dcterms.rightsHolderKluwer Academic Publ
unesp.campusUniversidade Estadual Paulista (Unesp), Faculdade de Ciências Farmacêuticas, Araraquarapt

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Artigos - Ciências Biológicas - FCFAR