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Corrêa de Sousa RP, Dos Santos JLA, Silva-Oliveira GC, Furo IDO, de Oliveira EHC, Vallinoto M. Characterization of a new cytotype and ocurrence of a B microchromosome in two spot astyanax, Astyanax bimaculatus Linnaeus, 1758 (Characiformes: Characidae). JOURNAL OF FISH BIOLOGY 2023; 102:520-524. [PMID: 36321966 DOI: 10.1111/jfb.15265] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/22/2022] [Accepted: 10/31/2022] [Indexed: 06/16/2023]
Abstract
Although Astyanax bimaculatus is the most representative species of the genus in the Amazon region, there are no cytogenetic studies of A. bimaculatus species in Amazon region. Thus, we aimed to analyse the chromosome complements of specimens from this area using classic and molecular cytogenetic approaches. The results revealed the existence of a distinct cytotype and this is the first report of the occurrence of a B microchromosome in the species. Overall, these data indicate that the karyotypic evolution of this species is complex, involving the occurrence of chromosomal rearrangements.
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Affiliation(s)
| | | | | | | | - Edivaldo Herculano Corrêa de Oliveira
- Instituto de Ciências Exatas e Naturais, Universidade Federal do Pará, Belém, Brazil
- Laboratório de Culturas de Células e Citogenética, Instituto Evandro Chagas, Ananindeua, Brazil
| | - Marcelo Vallinoto
- Laboratório de Evolução, Instituto de Estudos Costeiros, Universidade Federal do Pará, Bragança, Brazil
- Centro de Investigação em Biodiversidade e Recursos Genéticos, Laboratório associado, Universidade do Porto, Vairão, Portugal
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de Sousa RPC, Vasconcelos CP, Rosário NFD, Oliveira-Filho ABD, de Oliveira EHC, de Bello Cioffi M, Vallinoto M, Silva-Oliveira GC. Evolutionary Dynamics of Two Classes of Repetitive DNA in the Genomes of Two Species of Elopiformes (Teleostei, Elopomorpha). Zebrafish 2022; 19:24-31. [PMID: 35171711 DOI: 10.1089/zeb.2021.0027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
The order Elopiformes includes fish species of medium to large size with a circumglobal distribution, in both the open sea, coastal, and estuarine waters. The Elopiformes are considered an excellent model for evolutionary studies due to their ample adaptive capacity, which allow them to exploit a range of different ecological niches. In this study, we analyzed the karyotype structure and distribution of two classes of repetitive DNA (microsatellites and transposable elements) in two Elopiformes species (Elops smithi and Megalops atlanticus). The results showed that the microsatellite sequences had a very similar distribution in these species, primarily associated to heterochromatin (centromeres and telomeres), suggesting these sequences contribute to the chromosome structure. In contrast, specific signals detected throughout the euchromatic regions indicate that some of these sequences may play a role in the regulation of gene expression. By contrast, the transposable elements presented a distinct distribution in the two species, pointing to a possible interspecific difference in the function of these sequences in the genomes of the two species. Therefore, the comparative genome mapping provides new insights into the structure and organization of these repetitive sequences in the Elopiformes genome.
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Affiliation(s)
- Rodrigo Petry Corrêa de Sousa
- Instituto de Estudos Costeiros, Universidade Federal do Pará, Laboratório de Evolução, Bragança, Brazil.,Instituto de Ciências Biológicas and Universidade Federal do Pará, Belém, Brazil
| | | | - Nayara Furtado do Rosário
- Instituto de Estudos Costeiros, Universidade Federal do Pará, Laboratório de Evolução, Bragança, Brazil
| | | | - Edivaldo Herculano Corrêa de Oliveira
- Instituto de Ciências Exatas e Naturais, Universidade Federal do Pará, Belém, Brazil.,Laboratório de Culturas de Células e Citogenética, Instituto Evandro Chagas, Ananindeua, Brazil
| | - Marcelo de Bello Cioffi
- Laboratório de Citogenética de Peixes, Departamento de Evolução e Genética, Universidade Federal de São Carlos, São Carlos, Brazil
| | - Marcelo Vallinoto
- Instituto de Estudos Costeiros, Universidade Federal do Pará, Laboratório de Evolução, Bragança, Brazil.,Research Center in Biodiversity and Genetic Resources, Associated Laboratory, Campus Agrário de Vairão, Universidade do Porto, Vairão, Portugal
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