Chromosomes of Asian cyprinid fishes: Variable karyotype patterns and evolutionary trends in the genus Osteochilus (Cyprinidae, Labeoninae, 'Osteochilini')
| Autor: | Rafael Kretschmer, Francisco de Menezes Cavalcante Sassi, Alongklod Tanomtong, Montri Reungsing, Weerayuth Supiwong, Marcelo de Bello Cioffi, Luiz Antonio Carlos Bertollo, Pasakorn Saenjundaeng, Petr Ráb, Chatmongkon Suwannapoom |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
0106 biological sciences
0301 basic medicine Fish cytogenetics Lineage (evolution) QH426-470 01 natural sciences 03 medical and health sciences Monophyly Genus Genetics Molecular Biology Thai ichthyofauna Phylogenetic tree biology karyotype evolution Karyotype Microcephalus biology.organism_classification Labeoninae 030104 developmental biology Evolutionary biology Osteochilus repetitive DNAs Animal Genetics 010606 plant biology & botany |
| Zdroj: | Genetics and Molecular Biology, Vol 43, Iss 4 (2020) Genetics and Molecular Biology Genetics and Molecular Biology, Volume: 43, Issue: 4, Article number: e20200195, Published: 06 NOV 2020 Genetics and Molecular Biology v.43 n.4 2020 Sociedade Brasileira de Genética (SBG) instacron:SBG |
| ISSN: | 1678-4685 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|