Tracking the evolutionary pathways among Brazilian Lebiasina species (Teleostei: Lebiasinidae): a chromosomal and genomic comparative investigation

Author(s)

de Macedo Leite, Priscila Polaquini ; Cavalcante Sassi, Francisco de Menezes ; Ferreira Marinho, Manoela Maria ; Nirchio, Mauro ; Rosa de Moraes, Renata Luiza ; Toma, Gustavo Akira ; Carlos Bertollo, Luiz Antonio ; Cioffi, Marcelo de Bello

• Document type: Journal article
• Source: Neotropical Ichthyology; v. 20, n. 1, p. 14-pg., 2022-01-01.

Abstract

Despite several difficulties in chromosomal analyses of small-sized fishes, the cytogenetics of the Lebiasinidae was largely improved in the last years, showing differential patterns in the chromosomal evolution inside the family. In this context, it has been shown that genus Lebiasina preserves its karyotypic macrostructure, composed of 2n = 36 chromosomes, whereas the other genera generally present higher 2n. This study focused on the comparative cytogenetics of three Lebiasina species, one of them analyzed here for the first time, using conventional and molecular procedures. The results reinforced the differentiated evolutionary path of the genus Lebiasina while, at the same time, highlighted the genomic particularities that have accompanied the evolution of each species. In this sense, the repetitive components of the genome played a significant role in the differentiation of each species. It is also notable that L. minuta and L. melanoguttata, the two species that occur exclusively in the Brazilian territory, show greater chromosomal similarities to each other than to the trans-Andean sister species, L. bimaculata. (AU)

• FAPESP's process: 20/03046-5 - Evolutionary relationships in the genus Lebiasina (Characiformes, Lebiasinidae), with emphasis in Lebiasina minuta
• Grantee: Priscila Polaquini de Macedo Leite
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• FAPESP's process: 20/11772-8 - An integrative approach for the analysis of dispersal, adaptive and evolutionary processes between realted species with intercontinental distribution: the Osteoglossidae family (Teleostei, Osteoglossiformes) as an investigative model: part IV
• Grantee: Marcelo de Bello Cioffi
• Support Opportunities: Regular Research Grants
• FAPESP's process: 20/02681-9 - Evolutionary relationships and demographic history in Loricariidae (Siluriformes) species, with emphasis on Harttia genus
• Grantee: Francisco de Menezes Cavalcante Sassi
• Support Opportunities: Scholarships in Brazil - Doctorate