Karyotype and Repetitive DNA Analysis in Turcichondrostoma fahirae (Cypriniformes, Leuciscidae): A Step toward the Use of Molecular Cytogenetics in Taxonomy of Freshwater Fishes in Türkiye

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985904%3A_____%2F25%3A00636672" target="_blank" >RIV/67985904:_____/25:00636672 - isvavai.cz</a>

Result on the web

<a href="https://karger.com/cgr/article-abstract/165/1/39/925128/Karyotype-and-Repetitive-DNA-Analysis-in?redirectedFrom=fulltext" target="_blank" >https://karger.com/cgr/article-abstract/165/1/39/925128/Karyotype-and-Repetitive-DNA-Analysis-in?redirectedFrom=fulltext</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1159/000544909" target="_blank" >10.1159/000544909</a>

Result language

angličtina

Original language name

Karyotype and Repetitive DNA Analysis in Turcichondrostoma fahirae (Cypriniformes, Leuciscidae): A Step toward the Use of Molecular Cytogenetics in Taxonomy of Freshwater Fishes in Türkiye

Original language description

Introduction: Turkiye houses rich freshwater ichthyofauna with many endemic species. This diversity, however, poses taxonomic challenges and leads to ongoing re-evaluations of various fish genera and species. Here, we sought to analyze the karyotype and other chromosomal characteristics of the newly erected monotypic genus Turcichondrostoma to produce and validate cytogenetic markers potentially informative for future comparative studies. Methods: We examined an endemic species Turcichondrostoma fahirae (Tefenni nase) using conventional karyotyping and chromosome banding procedures (C-, fluorescent, and silver-nitrate banding/staining), as well as chromosomal mapping of 5S/18S ribosomal DNA (rDNA), U1/U2 small nuclear DNA (snDNA), and telomeric repeats. Results: A diploid chromosome number (2n) of T. fahirae was 50, consistent with conservative leuciscid pattern. The karyotype was composed of 12 metacentric, 22 submetacentric, 10 subtelocentric, and 6 acrocentric chromosomes. Low amount of constitutive heterochromatin was distributed almost exclusively across the pericentromeric regions of all chromosomes, with the most prominent C-bands being placed on a single chromosome pair carrying nucleolar organizer region (NOR). NORs (visualized consistently by silver-nitrate staining, chromomycin A3, and fluorescence in situ hybridization) exhibited marked size heteromorphism and were adjacent to a more centromere-proximal 5S rDNA site on the long arm. Additional 5S rDNA clusters occupied short arms of four acrocentric chromosomes, and another single subtelocentric pair carried a single co-localized U1/U2 snDNA site. No interstitial telomeric sequences were detected. Conclusion: We performed a pioneer molecular cytogenetic study in Turkish freshwater fish species and our data suggest that molecular cytogenetic markers will aid in future taxonomic comparisons. Our findings further corroborate conserved karyotype structure of leuciscid fishes in general.

Czech name

—

Czech description

—

Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10603 - Genetics and heredity (medical genetics to be 3)

Project

—

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2025

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Cytogenetic and Genome Research

ISSN

1424-8581

e-ISSN

1424-859X

Volume of the periodical

165

Issue of the periodical within the volume

1

Country of publishing house

CH - SWITZERLAND

Number of pages

12

Pages from-to

39-50

UT code for WoS article

001506118100001

EID of the result in the Scopus database

2-s2.0-105005759667