Karyomorphology of Two Cyprinid Barbels (Teleostei: Cyprinidae) from Gediz River, Turkey

Gaffaroğlu, Muhammet; Ayata, Muradiye Karasu; Unal-Karakus, Sevgi

doi:10.3103/s0095452722060032

Cited by 1 publication

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“…In general, available data demonstrate that although almost all cyprinoid species share the same macrostructure of their karyotypes (i.e. : 2n = 50 and karyotypes dominated by bi-armed chromosomes), they diverge in patterns of C-positive heterochromatin, and rDNA distribution [18,[20][21][22][23][24][25][26]. Considering this scenario, our study provides novel cytogenetic data for five Labeoninae species, namely Epalzeorhynchos bicolor Smith (1931), E. munense Smith (1934), Henicorhynchus siamensis Sauvage (1881), Thynnichthys thynnoides Bleeker (1852) and Labeo chrysophekadion Bleeker (1849) from two tribes (Osteochilini and Labeonini sensu Tan & Armbruster, 2018).…”

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confidence: 99%

Chromosomes of Asian cyprinid fishes: Novel insight into the chromosomal evolution of Labeoninae (Teleostei, Cyprinidae)

Khensuwan,

de Menezes Cavalcante Sassi,

Rosa de Moraes

et al. 2024

PLoS ONE

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The Labeoninae subfamily is a highly diversified but demonstrably monophyletic lineage of cyprinid fishes comprising five tribes and six incertae sedis genera. This widely distributed assemblage contains some 48 genera and around 480 recognized species distributed in freshwaters of Africa and Asia. In this study, the karyotypes and other chromosomal properties of five Labeoninae species found in Thailand Labeo chrysophekadion (Labeonini) and Epalzeorhynchos bicolor, Epalzeorhynchos munense, Henicorhynchus siamensis, Thynnichthys thynnoides (´Osteochilini´) were examined using conventional and molecular cytogenetic protocols. Our results confirmed a diploid chromosome number (2n) invariably 2n = 50, but the ratio of uni- and bi-armed chromosomes was highly variable among their karyotypes, indicating extensive structural chromosomal rearrangements. Karyotype of L. chrysophekadion contained 10m+6sm+20st+14a, 32m+10sm+8st for H. siamensis, 20m+12sm+10st+8a in E. bicolor, 20m+8sm+8st+14a in E. munense, and 18m+24sm+8st in T. thynnoides. Except for H. siamensis, which had four sites of 5S rDNA sites, other species under study had only one chromosome pair with those sites. In contrast, only one pair containing 18S rDNA sites were found in the karyotypes of three species, whereas two sites were found in that of E. bicolor. These cytogenetic patterns indicated that the cytogenomic divergence patterns of these labeonine species largely corresponded to the inferred phylogenetic tree. In spite of the 2n stability, diverse patterns of rDNA and microsatellite distribution as well as their various karyotype structures demonstrated significant evolutionary differentiation of Labeoninae genomes as exemplified in examined species. Labeoninae offers a traditional point of view on the evolutionary forces fostering biological diversity, and the recent findings add new pieces to comprehend the function of structural chromosomal rearrangements in adaption and speciation.

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