B chromosomes in a population of Astyanax eigenmanniorum (Characiformes, Characidae) from the Araguari River Basin (Uberlândia, MG, Brazil)
A cytogenetic study was conducted on an Astyanax eigenmanniorum population from the Caetano Stream (18° 44' 56" S/ 048° 18' 39" W) - in Uberlândia, MG, Brazil - showing a modal diploid number of 48 chromosomes in the standard male and female karyotypes. However, in several specim...
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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 |
| Subjects: | |
| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572008000200015 |
| _version_ | 1819076548534206464 |
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| author | Alessandra Ribeiro Torres-Mariano Sandra Morelli |
| author_facet | Alessandra Ribeiro Torres-Mariano Sandra Morelli |
| author_sort | Alessandra Ribeiro Torres-Mariano |
| collection | DOAJ |
| description | A cytogenetic study was conducted on an Astyanax eigenmanniorum population from the Caetano Stream (18° 44' 56" S/ 048° 18' 39" W) - in Uberlândia, MG, Brazil - showing a modal diploid number of 48 chromosomes in the standard male and female karyotypes. However, in several specimens it was also possible to observe metaphases with one or two B chromosomes, increasing the diploid number to 49 or 50 chromosomes, respectively. The supernumerary chromosomes were totally heterochromatic and highlighted after C-banding. The silver-stained nucleolus organizing regions (Ag-NORs) were located in at least five chromosomes of the standard karyotype, thus characterizing a multiple NOR system in the species. This is the first occurrence of an A. eigenmanniorum population with 2n = 48 chromosomes, bearing supernumerary chromosomes. |
| first_indexed | 2024-12-21T18:43:03Z |
| format | Article |
| id | doaj.art-608e3523c95841deb78b37efb41c2f2e |
| institution | Directory Open Access Journal |
| issn | 1415-4757 1678-4685 |
| language | English |
| last_indexed | 2024-12-21T18:43:03Z |
| publishDate | 2008-01-01 |
| publisher | Sociedade Brasileira de Genética |
| record_format | Article |
| series | Genetics and Molecular Biology |
| spelling | doaj.art-608e3523c95841deb78b37efb41c2f2e2022-12-21T18:53:57ZengSociedade Brasileira de GenéticaGenetics and Molecular Biology1415-47571678-46852008-01-0131124624910.1590/S1415-47572008000200015B chromosomes in a population of Astyanax eigenmanniorum (Characiformes, Characidae) from the Araguari River Basin (Uberlândia, MG, Brazil)Alessandra Ribeiro Torres-MarianoSandra MorelliA cytogenetic study was conducted on an Astyanax eigenmanniorum population from the Caetano Stream (18° 44' 56" S/ 048° 18' 39" W) - in Uberlândia, MG, Brazil - showing a modal diploid number of 48 chromosomes in the standard male and female karyotypes. However, in several specimens it was also possible to observe metaphases with one or two B chromosomes, increasing the diploid number to 49 or 50 chromosomes, respectively. The supernumerary chromosomes were totally heterochromatic and highlighted after C-banding. The silver-stained nucleolus organizing regions (Ag-NORs) were located in at least five chromosomes of the standard karyotype, thus characterizing a multiple NOR system in the species. This is the first occurrence of an A. eigenmanniorum population with 2n = 48 chromosomes, bearing supernumerary chromosomes.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572008000200015CharacidaeAstyanax eigenmanniorumsupernumerary chromosomeheterochromatinnucleolus organizing regions (NORs) |
| spellingShingle | Alessandra Ribeiro Torres-Mariano Sandra Morelli B chromosomes in a population of Astyanax eigenmanniorum (Characiformes, Characidae) from the Araguari River Basin (Uberlândia, MG, Brazil) Genetics and Molecular Biology Characidae Astyanax eigenmanniorum supernumerary chromosome heterochromatin nucleolus organizing regions (NORs) |
| title | B chromosomes in a population of Astyanax eigenmanniorum (Characiformes, Characidae) from the Araguari River Basin (Uberlândia, MG, Brazil) |
| title_full | B chromosomes in a population of Astyanax eigenmanniorum (Characiformes, Characidae) from the Araguari River Basin (Uberlândia, MG, Brazil) |
| title_fullStr | B chromosomes in a population of Astyanax eigenmanniorum (Characiformes, Characidae) from the Araguari River Basin (Uberlândia, MG, Brazil) |
| title_full_unstemmed | B chromosomes in a population of Astyanax eigenmanniorum (Characiformes, Characidae) from the Araguari River Basin (Uberlândia, MG, Brazil) |
| title_short | B chromosomes in a population of Astyanax eigenmanniorum (Characiformes, Characidae) from the Araguari River Basin (Uberlândia, MG, Brazil) |
| title_sort | b chromosomes in a population of astyanax eigenmanniorum characiformes characidae from the araguari river basin uberlandia mg brazil |
| topic | Characidae Astyanax eigenmanniorum supernumerary chromosome heterochromatin nucleolus organizing regions (NORs) |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572008000200015 |
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