Identification and description of distinct B chromosomes in Cyphocharax modestus (Characiformes, Curimatidae)
Cytogenetic analyses were performed in Cyphocharax modestus, collected at Paranapanema River and Tietê River (São Paulo State, Brazil). A karyotype with 2n = 54 chromosomes was observed in the animals from both Brazilian freshwater river systems. One to four B chromosomes were also detected in indiv...
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| Format: | Article |
| Language: | English |
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Sociedade Brasileira de Genética
2008-01-01
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| Series: | Genetics and Molecular Biology |
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| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572008000200019 |
| _version_ | 1811307960084725760 |
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| author | Lessandra Viviane De Rosa Santos Fausto Foresti Cesar Martins Claudio Oliveira Adriane Pinto Wasko |
| author_facet | Lessandra Viviane De Rosa Santos Fausto Foresti Cesar Martins Claudio Oliveira Adriane Pinto Wasko |
| author_sort | Lessandra Viviane De Rosa Santos |
| collection | DOAJ |
| description | Cytogenetic analyses were performed in Cyphocharax modestus, collected at Paranapanema River and Tietê River (São Paulo State, Brazil). A karyotype with 2n = 54 chromosomes was observed in the animals from both Brazilian freshwater river systems. One to four B chromosomes were also detected in individuals from the Paranapanema River, which represents the probable first report of more than a single supernumerary element in a species of the Curimatidae group. C-banding revealed centromeric and telomeric heterochromatin blocks in several chromosomes of the normal karyotype complement of C. modestus. Moreover, while some B chromosomes were characterized by the complete absence of C-bands, others were totally heterochromatic. Although there was a prevalence of B chromosomes in males of C. modestus, at least one supernumerary element was found in males and/or females of several other populations of the species, which suggests that the presence of these chromosomes seems to represent a general trait of C. modestus. A possible origin of the described B chromosomes may be related to the occurrence of a chromosome non-disjunction followed by the loss of euchromatic segments, an event that should have occurred in chromosomes that present conspicuous centromeric heterochromatic blocks and even in chromosomes that lack C-bands in this region, resulting in small supernumerary elements. |
| first_indexed | 2024-04-13T09:13:35Z |
| format | Article |
| id | doaj.art-885f6e7af68147fe93eaa75519b25634 |
| institution | Directory Open Access Journal |
| issn | 1415-4757 1678-4685 |
| language | English |
| last_indexed | 2024-04-13T09:13:35Z |
| publishDate | 2008-01-01 |
| publisher | Sociedade Brasileira de Genética |
| record_format | Article |
| series | Genetics and Molecular Biology |
| spelling | doaj.art-885f6e7af68147fe93eaa75519b256342022-12-22T02:52:49ZengSociedade Brasileira de GenéticaGenetics and Molecular Biology1415-47571678-46852008-01-0131126526910.1590/S1415-47572008000200019Identification and description of distinct B chromosomes in Cyphocharax modestus (Characiformes, Curimatidae)Lessandra Viviane De Rosa SantosFausto ForestiCesar MartinsClaudio OliveiraAdriane Pinto WaskoCytogenetic analyses were performed in Cyphocharax modestus, collected at Paranapanema River and Tietê River (São Paulo State, Brazil). A karyotype with 2n = 54 chromosomes was observed in the animals from both Brazilian freshwater river systems. One to four B chromosomes were also detected in individuals from the Paranapanema River, which represents the probable first report of more than a single supernumerary element in a species of the Curimatidae group. C-banding revealed centromeric and telomeric heterochromatin blocks in several chromosomes of the normal karyotype complement of C. modestus. Moreover, while some B chromosomes were characterized by the complete absence of C-bands, others were totally heterochromatic. Although there was a prevalence of B chromosomes in males of C. modestus, at least one supernumerary element was found in males and/or females of several other populations of the species, which suggests that the presence of these chromosomes seems to represent a general trait of C. modestus. A possible origin of the described B chromosomes may be related to the occurrence of a chromosome non-disjunction followed by the loss of euchromatic segments, an event that should have occurred in chromosomes that present conspicuous centromeric heterochromatic blocks and even in chromosomes that lack C-bands in this region, resulting in small supernumerary elements.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572008000200019B chromosomesC-bandingCurimatidaeCyphocharax modestussupernumerary chromosomes |
| spellingShingle | Lessandra Viviane De Rosa Santos Fausto Foresti Cesar Martins Claudio Oliveira Adriane Pinto Wasko Identification and description of distinct B chromosomes in Cyphocharax modestus (Characiformes, Curimatidae) Genetics and Molecular Biology B chromosomes C-banding Curimatidae Cyphocharax modestus supernumerary chromosomes |
| title | Identification and description of distinct B chromosomes in Cyphocharax modestus (Characiformes, Curimatidae) |
| title_full | Identification and description of distinct B chromosomes in Cyphocharax modestus (Characiformes, Curimatidae) |
| title_fullStr | Identification and description of distinct B chromosomes in Cyphocharax modestus (Characiformes, Curimatidae) |
| title_full_unstemmed | Identification and description of distinct B chromosomes in Cyphocharax modestus (Characiformes, Curimatidae) |
| title_short | Identification and description of distinct B chromosomes in Cyphocharax modestus (Characiformes, Curimatidae) |
| title_sort | identification and description of distinct b chromosomes in cyphocharax modestus characiformes curimatidae |
| topic | B chromosomes C-banding Curimatidae Cyphocharax modestus supernumerary chromosomes |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572008000200019 |
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