| Texto completo | |
| Autor(es): Mostrar menos - |
Deon, Geize Aparecida
;
Glugoski, Larissa
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Hatanaka, Terumi
;
Cavalcante Sassi, Francisco de Menezes
;
Nogaroto, Viviane
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Carlos Bertollo, Luiz Antonio
;
Liehr, Thomas
;
Al-Rikabi, Ahmed
;
Moreira Filho, Orlando
;
Cioffi, Marcelo de Bello
;
Vicari, Marcelo Ricardo
Número total de Autores: 11
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| Tipo de documento: | Artigo Científico |
| Fonte: | GENETICS AND MOLECULAR BIOLOGY; v. 45, n. 2, p. 12-pg., 2022-01-01. |
| Resumo | |
The Neotropical armored catfish genus Harttia presents a wide variation of chromosomal rearrangements among its representatives. Studies indicate that translocation and Robertsonian rearrangements have triggered the karyotype evolution in the genus, including differentiation of sex chromosome systems. However, few studies used powerful tools, such as comparative whole chromosome painting, to clarify this highly diversified scenario. Here, we isolated probes from the X-1 (a 5S rDNA carrier) and the X-2 (a 45S rDNA carrier) chromosomes of Harttia punctata, which displays an X1X1X2X2/X1X2Y multiple sex chromosome system. Those probes were applied in other Harttia species to evidence homeologous chromosome blocks. The resulting data reinforce that translocation events played a role in the origin of the X1X2 Y sex chromosome system in H. punctata. The repositioning of homologous chromosomal blocks carrying rDNA sites among ten Harttia species has also been demonstrated. Anchored to phylogenetic data it was possible to evidence some events of the karyotype diversification of the studied species and to prove an independent origin for the two types of multiple sex chromosomes, XX/XY1Y2 and X1X1X2X2/X1X2Y, that occur in Harttia species. The results point to evolutionary breakpoint regions in the genomes within or adjacent to rDNA sites that were widely reused in Harttia chromosome remodeling. (AU) | |
| Processo FAPESP: | 17/24695-9 - Pontos de quebras de DNA e rearranjos cromossômicos em peixes da família Loricariidae (Teleostei, Siluriformes): Uma abordagem citogenética e molecular |
| Beneficiário: | Orlando Moreira Filho |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |