Karyotypic differentiation through chromosome fusion and number reduction in Imparfinis hollandi (Ostariophysi, Heptapteridae)
The Neotropical Heptapteridae fish Imparfinis hollandi, endemic to the Iguaçu River Basin (Brazil), was cytogenetically analyzed and the diploid chromosome number of 2n = 42 chromosomes was determined (22m + 10sm + 10st), the lowest diploid number in this genus and family. Like other Heptapteridae s...
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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=S1415-47572008000200012 |
| _version_ | 1818516794927742976 |
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| author | Vladimir Pavan Margarido Orlando Moreira-Filho |
| author_facet | Vladimir Pavan Margarido Orlando Moreira-Filho |
| author_sort | Vladimir Pavan Margarido |
| collection | DOAJ |
| description | The Neotropical Heptapteridae fish Imparfinis hollandi, endemic to the Iguaçu River Basin (Brazil), was cytogenetically analyzed and the diploid chromosome number of 2n = 42 chromosomes was determined (22m + 10sm + 10st), the lowest diploid number in this genus and family. Like other Heptapteridae species, only one NOR-bearing chromosome pair was detected by silver nitrate staining. Dark heterochromatic blocks were visualized in only three chromosome pairs, and chromomycin A3+ bands were coincident with Ag-NORs. Although no intercalary (TTAGGG)n sequence was observed through FISH with a telomere probe, an asymmetric karyotype showing four large chromosome pairs with diploid chromosome number reduction suggests that tandem chromosome fusions probably occurred during the karyotypic differentiation of Imparfinis hollandi. |
| first_indexed | 2024-12-11T00:47:16Z |
| format | Article |
| id | doaj.art-41124bd137d3457bab64666921c98f2e |
| institution | Directory Open Access Journal |
| issn | 1415-4757 1678-4685 |
| language | English |
| last_indexed | 2024-12-11T00:47:16Z |
| publishDate | 2008-01-01 |
| publisher | Sociedade Brasileira de Genética |
| record_format | Article |
| series | Genetics and Molecular Biology |
| spelling | doaj.art-41124bd137d3457bab64666921c98f2e2022-12-22T01:26:44ZengSociedade Brasileira de GenéticaGenetics and Molecular Biology1415-47571678-46852008-01-0131123523810.1590/S1415-47572008000200012Karyotypic differentiation through chromosome fusion and number reduction in Imparfinis hollandi (Ostariophysi, Heptapteridae)Vladimir Pavan MargaridoOrlando Moreira-FilhoThe Neotropical Heptapteridae fish Imparfinis hollandi, endemic to the Iguaçu River Basin (Brazil), was cytogenetically analyzed and the diploid chromosome number of 2n = 42 chromosomes was determined (22m + 10sm + 10st), the lowest diploid number in this genus and family. Like other Heptapteridae species, only one NOR-bearing chromosome pair was detected by silver nitrate staining. Dark heterochromatic blocks were visualized in only three chromosome pairs, and chromomycin A3+ bands were coincident with Ag-NORs. Although no intercalary (TTAGGG)n sequence was observed through FISH with a telomere probe, an asymmetric karyotype showing four large chromosome pairs with diploid chromosome number reduction suggests that tandem chromosome fusions probably occurred during the karyotypic differentiation of Imparfinis hollandi.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572008000200012Siluriformeschromosome bandingchromosomal rearrangements(TTAGGG)n |
| spellingShingle | Vladimir Pavan Margarido Orlando Moreira-Filho Karyotypic differentiation through chromosome fusion and number reduction in Imparfinis hollandi (Ostariophysi, Heptapteridae) Genetics and Molecular Biology Siluriformes chromosome banding chromosomal rearrangements (TTAGGG)n |
| title | Karyotypic differentiation through chromosome fusion and number reduction in Imparfinis hollandi (Ostariophysi, Heptapteridae) |
| title_full | Karyotypic differentiation through chromosome fusion and number reduction in Imparfinis hollandi (Ostariophysi, Heptapteridae) |
| title_fullStr | Karyotypic differentiation through chromosome fusion and number reduction in Imparfinis hollandi (Ostariophysi, Heptapteridae) |
| title_full_unstemmed | Karyotypic differentiation through chromosome fusion and number reduction in Imparfinis hollandi (Ostariophysi, Heptapteridae) |
| title_short | Karyotypic differentiation through chromosome fusion and number reduction in Imparfinis hollandi (Ostariophysi, Heptapteridae) |
| title_sort | karyotypic differentiation through chromosome fusion and number reduction in imparfinis hollandi ostariophysi heptapteridae |
| topic | Siluriformes chromosome banding chromosomal rearrangements (TTAGGG)n |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572008000200012 |
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