| Autor: |
de Sousa RPC; Instituto de Estudos Costeiros, Universidade Federal do Pará, Laboratório de Evolução, Bragança, Brazil.; Instituto de Ciências Biológicas and Universidade Federal do Pará, Belém, Brazil., Vasconcelos CP; Instituto de Ciências Biológicas and Universidade Federal do Pará, Belém, Brazil., Rosário NFD; Instituto de Estudos Costeiros, Universidade Federal do Pará, Laboratório de Evolução, Bragança, Brazil., Oliveira-Filho AB; Instituto de Estudos Costeiros, Universidade Federal do Pará, Laboratório de Evolução, Bragança, Brazil., de Oliveira EHC; Instituto de Ciências Exatas e Naturais, Universidade Federal do Pará, Belém, Brazil.; Laboratório de Culturas de Células e Citogenética, Instituto Evandro Chagas, Ananindeua, Brazil., de Bello Cioffi M; Laboratório de Citogenética de Peixes, Departamento de Evolução e Genética, Universidade Federal de São Carlos, São Carlos, Brazil., Vallinoto M; 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., Silva-Oliveira GC; Instituto de Estudos Costeiros, Universidade Federal do Pará, Laboratório de Evolução, Bragança, Brazil. |
| Abstrakt: |
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. |
