2010
DOI: 10.1590/s1679-62252010000400016
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Abstract: Karyotype and other chromosomal markers as revealed by C-banding and silver (Ag) impregnation in two Astyanax bockmanni populations (Barra Seca Stream and Campo Novo River) were examined. The diploid chromosome number 2n = 50 and nearly identical karyotypes were documented. C-banding revealed heterochromatic blocks on the terminal regions of some chromosomes, with high frequencies of polymorphisms. The Ag-impregnation showed that the nucleolus organizer regions (NORs) varied in number, location and organizatio… Show more

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Cited by 17 publications
(12 citation statements)
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“…These data corroborate previous information about the diploid chromosome number and karyotype characteristics reported by Hashimoto et al (2011). In contrast to the species complexes Astyanax fasciatus and Astyanax scabripinnis, which show variable diploid chromosome numbers in different individuals living in sympatry (Moreira-Filho and Bertollo 1991; Artoni, Shibatta et al 2006, Machado et al 2012, cytogenetic studies in some populations of A. bockmanni demonstrated a stable 2n (Kavalco et al 2009;Fernandes et al 2010;Hashimoto and Porto-Foresti 2010).…”
Section: Resultssupporting
confidence: 90%
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“…These data corroborate previous information about the diploid chromosome number and karyotype characteristics reported by Hashimoto et al (2011). In contrast to the species complexes Astyanax fasciatus and Astyanax scabripinnis, which show variable diploid chromosome numbers in different individuals living in sympatry (Moreira-Filho and Bertollo 1991; Artoni, Shibatta et al 2006, Machado et al 2012, cytogenetic studies in some populations of A. bockmanni demonstrated a stable 2n (Kavalco et al 2009;Fernandes et al 2010;Hashimoto and Porto-Foresti 2010).…”
Section: Resultssupporting
confidence: 90%
“…However, according to the isochromosomes origin, the centromere misdivision of an acrocentric chromosome ancestor and subsequent chromatid non-disjunction may simultaneously originate Conversely, our results showed the occurrence of B M and B microchromosome variants together in the same population, which supports the isochromosome origin of ). The analysis of constitutive heterochromatin patterns showed heterochromatic blocks in the pericentromeric regions of most chromosomes and evident signals in the terminal regions of some chromosomes (Figure 2), similar to those found in other populations of A. bockmanni (Kavalco et al 2009;Hashimoto and Porto-Foresti 2010). In relation to the B chromosomes, all three morphological variants (B M , B m , and B a ) were identified as heterochromatic (Figure 2), in accordance with a common characteristic reported for B chromosomes in the genus Astyanax (Néo et al 2000;Moreira-Filho et al 2001;Hashimoto et al 2008;Machado et al 2012).…”
Section: Resultssupporting
confidence: 83%
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“…These characteristics are related to distinct karyotype macrostructure and diploid number, ranging from 36 to 50 chromosomes [Moreira-Filho and Bertollo, 1991;Almeida-Toledo et al, 2002;Pazza et al, 2008], occurrence of B chromosomes Hashimoto et al, 2011], different patterns of constitutive heterochromatin distribution [Mantovani et al, 2000;Hashimoto and Porto-Foresti, 2010], and differential dispersion of repetitive DNAs [Almeida-Toledo et al, 2002;Kantek et al, 2009]. In A .…”
Section: Discussionmentioning
confidence: 99%