Chromosomes of Asian cyprinid fishes: Variable karyotype patterns and evolutionary trends in the genus Osteochilus (Cyprinidae, Labeoninae, “Osteochilini”)

Autor(es)

Pasakorn Saenjundaeng ^[1] ; Weerayuth Supiwong ^[2] ; Francisco M. C. Sassi ^[3] ; Luiz A. C. Bertollo ^[4] ; Petr Rab ^[5] ; Rafael Kretschmer ^[6] ; Alongklod Tanomtong ^[7] ; Chatmongkon Suwannapoom ^[8] ; Montri Reungsing ^[9] ; Marcelo de Bello Cioffi ^[10]

Afiliação do(s) autor(es)

^[1] Khon Kaen University. Faculty of Interdisciplinary Studies - Tailândia

^[2] Khon Kaen University. Faculty of Interdisciplinary Studies - Tailândia

^[3] Universidade Federal de São Carlos. Departamento de Genética e Evolução - Brasil

^[4] Universidade Federal de São Carlos. Departamento de Genética e Evolução - Brasil

^[5] Czech Academy of Sciences. Institute of Animal Physiology and Genetics. Laboratory of Fish Genetics - República Tcheca

^[6] Universidade Federal do Rio Grande do Sul. Programa de Pós-Graduação em Genética e Biologia Molecular - Brasil

^[7] KhonKaen University. Faculty of Science. Department of Biology - Tailândia

^[8] University of Phayao. School of Agriculture and Natural Resources. Department of Fishery - Tailândia

^[9] Rajamangala University of Technology Tawan-ok. Faculty of Science and Technology. Department of Biotechnology - Tailândia

^[10] Universidade Federal de São Carlos. Departamento de Genética e Evolução - Brasil

• Tipo de documento: Artigo Científico
• Fonte: GENETICS AND MOLECULAR BIOLOGY; v. 43, n. 4 2020-11-06.

Resumo

Abstract The Cyprinidae family is a highly diversified but demonstrably monophyletic lineage of cypriniform fishes. Among them, the genus Osteochilus contains 35 recognized valid species distributed from India, throughout Myanmar, Laos, Thailand, Malaysia, Indonesian archipelago to southern China. In this study, karyotypes and other chromosomal characteristics of five Osteochilus species occurring in Thailand, namely O. lini, O. melanopleura, O. microcephalus, O. vittatus and O. waandersii were examined using conventional and molecular cytogenetic protocols. Our results showed they possessed diploid chromosome number (2n) invariably 2n = 50, but the ratio of uni- and bi-armed chromosomes was highly variable among their karyotypes, indicating extensive chromosomal rearrangements. Only one chromosome pair bearing 5S rDNA sites occurred in most species, except O. melanopleura, where two sites were detected. In contrast, only one chromosomal pair bearing 18S rDNA sites were observed among their karyotypes, but in different positions. These cytogenetic patterns indicated that the cytogenomic divergence patterns of these Osteochilus species were largely corresponding to the inferred phylogenetic tree. Similarly, different patterns of the distributions of rDNAs and microsatellites across genomes of examined species as well as their different karyotype structures indicated significant evolutionary differentiation of Osteochilus genomes. (AU)

• Processo FAPESP: 18/22033-1 - Uma abordagem intercontinental para a investigação da evolução cromossômica, diversidade genética e biogeografia na ordem Osteoglossiformes (Teleostei: Osteoglossomorpha). Parte III.
• Beneficiário: Marcelo de Bello Cioffi
• Modalidade de apoio: Auxílio à Pesquisa - Regular