Variation in hybridogenetic hybrid emergence between populations of water frogs from the Pelophylax esculentus complex


Autoři: Dmitrij Dedukh aff001;  Julia Litvinchuk aff001;  Anton Svinin aff002;  Spartak Litvinchuk aff003;  Juriy Rosanov aff003;  Alla Krasikova aff001
Působiště autorů: Saint-Petersburg State University, Saint-Petersburg, Russia aff001;  Mari State University, Mari El Republic, Russia aff002;  Institute of Cytology, Russian Academy of Sciences, Saint-Petersburg, Russia aff003;  Department of Zoology and Physiology, Dagestan State University, Makhachkala, Russia aff004
Vyšlo v časopise: PLoS ONE 14(11)
Kategorie: Research Article
doi: 10.1371/journal.pone.0224759

Souhrn

Many closely related species are capable of mating to produce hybrid offspring, which are usually sterile. Nevertheless, altering the gametogenesis of hybrid offspring can rescue hybrids from sterility by enabling asexual reproduction. Hybridogenesis is one of the most complicated asexual reproductive modes, and it includes drastic genome reorganization only in the germline; this is achieved through elimination of one parental genome and duplication of the remaining one to restore diploid chromosomal set and overcome blocks in meiotic progression. We investigated a model of hybridogenesis, namely, water frogs from the Pelophylax esculentus complex, for the emergence of asexual reproduction. Further, we assessed the impact of its asexual reproduction on the maintenance of interspecies hybrids from two populations on the western edge of the P. esculentus range, in which hybrids coexist with either both parental species or with only one parental species. After analysing tadpole karyotypes, we conclude that in both studied populations, the majority of diploid hybrid males produced haploid gametes with the P. ridibundus genome after elimination of the P. lessonae genome. Hybrid females exhibited problems with genome elimination and duplication; they usually produced oocytes with univalents, but there were observations of individual oocytes with 13 bivalents and even 26 bivalents. In some hybrid tadpoles, especially F1 crosses, we observed failed germ cell development, while in tadpoles from backcrosses, germ cells were normally distributed and contained micronuclei. By identifying chromosomes present in micronuclei, we estimated that the majority of tadpoles from all crosses were able to selectively eliminate the P. lessonae chromosomes. According to our results, hybridogenesis in hybrids can appear both from crosses of parental species and crosses between sexual species with hybrid individuals. The ability to eliminate a genome and perform endoreplication to ensure gamete formation differed between male and female hybrids from the studied populations. Some diploid hybrid females can rarely produce not only haploid gametes but also diploid gametes, which is a crucial step in the formation of triploid hybrids.

Klíčová slova:

Amphibian genomics – Frogs – Gametogenesis – Germ cells – Gonads – Micronuclei – Oocytes – Tadpoles


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2019 Číslo 11