High Genetic Diversity despite Conserved Karyotype Organization in the Giant Trahiras from Genus Hoplias (Characiformes, Erythrinidae)

Author(s):Show less -

de M. C. Sassi, Francisco ^[1] ; Perez, Manolo F. ^[1] ; Oliveira, Vanessa Cristina S. ^[1] ; Deon, Geize A. ^[1] ; de Souza, Fernando H. S. ^[1] ; Ferreira, Pedro H. N. ^[1] ; de Oliveira, Ezequiel A. ^[2] ; Hatanaka, Terumi ^[1] ; Liehr, Thomas ^[3] ; Bertollo, Luiz A. C. ^[1] ; de B. Cioffi, Marcelo ^[1]

Affiliation

^[1] Univ Fed Sao Carlos, Dept Genet & Evolucao, Lab Citogenet Peixes, BR-13565905 Sao Carlos, SP - Brazil

^[2] Secretaria Estado Educ Mato Grosso SEDUC MT, BR-78049909 Cuiaba, MT - Brazil

^[3] Univ Hosp Jena, Inst Human Genet, D-07747 Jena - Germany

• Document type: Journal article
• Source: GENES; v. 12, n. 2 FEB 2021.
• Web of Science Citations: 0

Abstract

In the fish genus Hoplias, two major general groups can be found, one of which is formed by the ``common trahiras{''} (Hoplias malabaricus group) and the other by the ``giant trahiras{''} (Hoplias lacerdae group, in addition to Hoplias aimara), which usually comprises specimens of larger body size. Previous investigations from the giant trahiras group recovered 2n = 50 meta/submetacentric chromosomes and no sex chromosome differentiation, indicating a probable conservative pattern for their karyotype organization. Here, we conducted comparative cytogenetic studies in six giant trahiras species, two of them for the first time. We employed standard and advanced molecular cytogenetics procedures, including comparative genomic hybridization (CGH), as well as genomic assessments of diversity levels and phylogenetic relationships among them. The results strongly suggest that the giant trahiras have a particular and differentiated evolutionary pathway inside the Hoplias genus. While these species share the same 2n and karyotypes, their congeneric species of the H. malabaricus group show a notable chromosomal diversity in number, morphology, and sex chromosome systems. However, at the same time, significant changes were characterized at their inner chromosomal level, as well as in their genetic diversity, highlighting their current relationships resulting from different evolutionary histories. (AU)

• FAPESP's process: 18/24235-0 - Karyotype and sex chromosome evolution in Neotropical fishes. Part III.
• Grantee: Luiz Antonio Carlos Bertollo
• Support Opportunities: Regular Research Grants
• FAPESP's process: 18/22033-1 - An intercontinental approach for the investigation of chromosome evolution, genetic diversity and biogeography in the order Osteoglossiformes (Teleostei: Osteoglossomorpha). Part III
• 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