Cytogenetics of the Hybridogenetic Frog Pelophylax grafi and Its Parental Species Pelophylax perezi

0581029 - ÚŽFG 2024 RIV US eng J - Journal Article
Dudzik, A. - Dedukh, Dmitrij - Crochet, P-A. - Rozenblut-Koscisty, B. - Rybka, H. - Doniol-Valcroze, P. - Choleva, Lukáš - Ogielska, M. - Chmielewska, M.
Cytogenetics of the Hybridogenetic Frog Pelophylax grafi and Its Parental Species Pelophylax perezi.
Genome Biology and Evolution. Roč. 15, č. 12 (2023), č. článku evad215. ISSN 1759-6653. E-ISSN 1759-6653
Institutional support: RVO:67985904
Keywords : hybridogenesis * karyotype * Pelophylax grafi * Pelophylax perezi * fluorescent in situ hybridization * comparative genomic hybridization
OECD category: Biology (theoretical, mathematical, thermal, cryobiology, biological rhythm), Evolutionary biology
Impact factor: 3.3, year: 2022
Method of publishing: Open access
https://academic.oup.com/gbe/article/15/12/evad215/7453301?login=true

Hybrid taxa from the genus Pelophylax can propagate themselves in a modified way of sexual reproduction called hybridogenesis ensuring the formation of clonal gametes containing the genome of only one parental (host) species. Pelophylax grafi from South-Western Europe is a hybrid composed of P. ridibundus and P. perezi genomes and it lives with a host species P. perezi (P-G system). Yet it is unknown, whether non-Mendelian inheritance is fully maintained in such populations. In this study, we characterize P. perezi and P. grafi somatic karyotypes by using comparative genomic hybridization, genomic in situ hybridization, fluorescent in situ hybridization, and actinomycin D-DAPI. Here, we show the homeology of P. perezi and P. grafi somatic karyotypes to other Pelophylax taxa with 2n = 26 and equal contribution of ridibundus and perezi chromosomes in P. grafi which supports F1 hybrid genome constitution as well as a hemiclonal genome inheritance. We show that ridibundus chromosomes have larger regions of interstitial (TTAGGG)n repeats flanking the nucleolus organizing region on chromosome no. 10 and a high quantity of AT pairs in the centromeric regions. In P. perezi, we found species-specific sequences in metaphase chromosomes and marker structures in lampbrush chromosomes. Pericentromeric RrS1 repeat sequence was present in perezi and ridibundus chromosomes, but the blocks were stronger in ridibundus. Various cytogenetic techniques applied to the P-G system provide genome discrimination between ridibundus and perezi chromosomal sets. They could be used in studies of germ-line cells to explain patterns of clonal gametogenesis in P. grafi and broaden the knowledge about reproductive strategies in hybrid animals.
Permanent Link: https://hdl.handle.net/11104/0349697