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(Reference retrieved automatically from SciELO through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Evolutionary breakpoint regions and chromosomal remodeling in Harttia (Siluriformes: Loricariidae) species diversification

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Geize Aparecida Deon ; Larissa Glugoski ; Terumi Hatanaka [3] ; Francisco de Menezes Cavalcante Sassi [4] ; Viviane Nogaroto [5] ; Luiz Antonio Carlos Bertollo [6] ; Thomas Liehr [7] ; Ahmed Al-Rikabi ; Orlando Moreira Filho [9] ; Marcelo de Bello Cioffi [10] ; Marcelo Ricardo Vicari [11]
Total Authors: 11
Document type: Journal article
Source: GENETICS AND MOLECULAR BIOLOGY; v. 45, n. 2 2022-05-20.

Abstract 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 X1 (a 5S rDNA carrier) and the X2 (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 X1X2Y 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)

FAPESP's process: 17/24695-9 - DNA breakpoints and chromosomal rearrangements in Loricariidae fishes (Teleostei, Siluriformes): A cytogenetic and molecular approach
Grantee:Orlando Moreira Filho
Support Opportunities: Regular Research Grants