2003
DOI: 10.1034/j.1601-5223.2003.01714.x
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Abstract: Cytogenetic studies were performed in two syntopic species of Characidium, C. lauroi and Characidium sp. cf. C. alipioi, from Ribeirão Grande, Paraíba do Sul river basin. Both species have diploid number 2n =50 chromosomes, but differ in chromosome shape, C-banding pattern and location of nucleolar organizing regions. In Characidium sp. cf. C. alipioi a new type of ZW sex chromosome system composed of equal sized metacentric chromosomes is reported for the first time in the genus Characidium. Species of Charac… Show more

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Cited by 34 publications
(61 citation statements)
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“…The species studied presented a conserved karyotypic macrostructure, mainly in relation to their diploid number and the presence of metacentric and submetacentric chromosomes. Nevertheless, the presence of B chromosomes in C. pterostictum and C. oiticicai, the occurrence of sex chromosomes in most of the analyzed species, the occurrence of NORs associated with sex chromosomes, and the occurrence of a pair of acrocentric chromosomes in C. pterostictum (Table 2) reinforce the evidence already postulated for some species of Characidium, which suggested the existence of a great chromosome variability among the representatives of this genus (Maistro et al, 1998(Maistro et al, , 2004Centofante et al, 2001Centofante et al, , 2003Vicari et al, 2008;Noleto et al, 2009).…”
Section: Discussionsupporting
confidence: 74%
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“…The species studied presented a conserved karyotypic macrostructure, mainly in relation to their diploid number and the presence of metacentric and submetacentric chromosomes. Nevertheless, the presence of B chromosomes in C. pterostictum and C. oiticicai, the occurrence of sex chromosomes in most of the analyzed species, the occurrence of NORs associated with sex chromosomes, and the occurrence of a pair of acrocentric chromosomes in C. pterostictum (Table 2) reinforce the evidence already postulated for some species of Characidium, which suggested the existence of a great chromosome variability among the representatives of this genus (Maistro et al, 1998(Maistro et al, , 2004Centofante et al, 2001Centofante et al, , 2003Vicari et al, 2008;Noleto et al, 2009).…”
Section: Discussionsupporting
confidence: 74%
“…Thus, the heterochromatinization mechanism appears to play an important role in the differentiation of W chromosome from the protosex chromosome among populations/species in an independent pathway. In the present study, the identification and analysis of sexual chromosomes in C. lanei, C. pterostictum, C. lauroi, C. oiticicai, C. schubarti, and Characidium sp., which characterize Z and W heteromorphic chromosome systems in distinct stages of differentiation, supports the propositions postulated by Centofante et al (2001Centofante et al ( , 2003 and Vicari et al (2008) that heterochromatinization events could have occurred in the ancestors of these species and that sex chromosomes differentiated independently during the speciation process. This could explain the differences found among the level of heterochromatinization in some species analyzed, possibly reinforcing the hypothesis of a common origin for heteromorphic sex chromosomes followed by an independent process of differentiation in the Characidium species.…”
Section: Discussionsupporting
confidence: 73%
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