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

dc.contributorUniversidade Estadual Paulista (UNESP)
dc.creatorMantovani, M.
dc.creatorAbel, LDD
dc.creatorMestriner, C. A.
dc.creatorMoreira, O.
dc.date2014-05-20T13:24:37Z
dc.date2016-10-25T16:45:21Z
dc.date2014-05-20T13:24:37Z
dc.date2016-10-25T16:45:21Z
dc.date2000-01-01
dc.date.accessioned2017-04-05T20:00:51Z
dc.date.available2017-04-05T20:00:51Z
dc.identifierGenetica. Dordrecht: Kluwer Academic Publ, v. 109, n. 3, p. 161-168, 2000.
dc.identifier0016-6707
dc.identifierhttp://hdl.handle.net/11449/7699
dc.identifierhttp://acervodigital.unesp.br/handle/11449/7699
dc.identifier10.1023/A:1017546601065
dc.identifierWOS:000169127000002
dc.identifierhttp://dx.doi.org/10.1023/A:1017546601065
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/856279
dc.descriptionAstyanax 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.
dc.languageeng
dc.publisherKluwer Academic Publ
dc.relationGenetica
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.subjectAstyanax scabripinnis
dc.subjectconstitutive heterochromatin
dc.subjectkaryotypic evolution
dc.subjectnucleolar organizer regions (NORs)
dc.subjectpolymorphism
dc.titleAccentuated polymorphism of heterochromatin and nucleolar organizer regions in Astyanax scabripinnis (Pisces, Characidae): tools for understanding karyotypic evolution
dc.typeOtro


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