Наукові видання Біологічний факультет
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Документ Distinct fate of the asexual genomes in two convergently evolved Pelophylax hybridogenetic systems(Sex uncovered: the evolutionary biology of reproductive systems. – Roscoff (Brittany), France., 2018) Mazepa, G.; Doležálková, M.; Choleva, L.; Ploetner, J.; Biriuk, O.; Drohvalenko, M.; Korshunov, O.; Shabanov, D.; Wolf, J.; Perrin, N.Документ Mutual maintenance of di- and triploid Pelophylax esculentus hybrids in R-E systems: results fro(BMC Evolutionary Biology, 2017) Dedukh, D.; Litvinchuk, S.; Rosanov, Yu.; Shabanov, D.; Krasikova, A.Background: Interspecies animal hybrids can employ clonal or hemiclonal reproduction modes where one or all parental genomes are transmitted to the progeny without recombination. Nevertheless, some interspecies hybrids retain strong connection with the parental species needed for successful reproduction. Appearance of polyploid hybrid animals may play an important role in the substitution of parental species and in the speciation process. Results: To establish the mechanisms that enable parental species, diploid and polyploid hybrids coexist we have performed artificial crossing experiments of water frogs of Pelophylax esculentus complex. We identified tadpole karyotypes and oocyte genome composition in all females involved in the crossings. The majority of diploid and triploid hybrid frogs produced oocytes with 13 bivalents leading to haploid gametes with the same genome as parental species hybrids usually coexist with. After fertilization of such gametes only diploid animals appeared. Oocytes with 26 bivalents produced by some diploid hybrid frogs lead to diploid gametes, which give rise to triploid hybrids after fertilization. In gonads of all diploid and triploid hybrid tadpoles we found DAPI-positive micronuclei (nucleus-like bodies) involved in selective genome elimination. Hybrid male and female individuals produced tadpoles with variable karyotype and ploidy even in one crossing owing to gametes with various genome composition. Conclusions: We propose a model of diploid and triploid hybrid frog reproduction in R-E population systems. Triploid Pelophylax esculentus hybrids can transmit genome of parental species they coexist with by producing haploid gametes with the same genome composition. Triploid hybrids cannot produce triploid individuals after crossings with each other and depend on diploid hybrid females producing diploid eggs. In contrast to other population systems, the majority of diploid and triploid hybrid females unexpectedly produced gametes with the same genome as parental species hybrids coexist with.Документ Pecularities of oogenesis in hybridogenetic european water frog complex (Pelophylax esculentus com-plex)(Bologna: Dipartimento BiGeA Complesso Belmeloro, 2013) Dedukh, D.; Mazepa, G.; Shabanov, D.; Rosanov, J.; Litvinchuk, S.; Saifitdinova, A.; Krasikova, A.Документ Sustainable coexistence of the parental species and hemiclonal interspecific hybrids is provided by the variety of ontogenetic strategies: simulation HPS Pelophylax esculentus complex preliminary results(Daugavpils University, 2015) Shabanov, D.; Usova, O.; Kravchenko, M.; Leonov, A.; Korshunov, O.; Mair, Q.; Meleshko, O.; Newman, J.; Vladymyrova, M.; Zholtkevych, G.Документ Composition and characteristic of subadult water frogs sample (Pelophylax esculentus complex)(Daugavpils University, 2015) Biriuk, O.; Usova, O.; Meleshko, O.; Shabanov, D.Документ Simulation of the Expanded Iterated Version of the Prisoner's Dilemma Game Recognisers(Proc. 7-th Int. Conf. ICTERI 2011, 2011) Vlasova, T.; Vladymyrova, M.; Shabanov, D.This paper presents the model and software to explore pair interactions of objects with different behavior and their patterns. The research is based on the enhanced version of a classic prisoner’s dilemma game. The non-cooperative finite and infinite pair games with non-zero sums are investigated. Pure and mixed strategies with finite and infinite memory developed by Biology School of V. N. Karazin Kharkiv National University are used to analyze the results.Документ Optional endoreplication and selective elimination of parental genomes during oogenesis in diploid and triploid hybrid european water frogs(PLoS ONE, 2015) Dedukh, D.; Litvinchuk, S.; Rosanov, Ju.; Mazepa, G.; Saifitdinova, A.; Shabanov, D.; Krasikova, A.Incompatibilities between parental genomes decrease viability of interspecific hybrids; however, deviations from canonical gametogenesis such as genome endoreplication and elimination can rescue hybrid organisms. To evaluate frequency and regularity of genome elimination and endoreplication during gametogenesis in hybrid animals with different ploidy, we examined genome composition in oocytes of di- and triploid hybrid frogs of the Pelophylax esculentus complex. Obtained results allowed us to suggest that during oogenesis the endoreplication involves all genomes occurring before the selective genome elimination. We accepted the hypothesis that only elimination of one copied genome occurs premeiotically in most of triploid hybrid females. At the same time, we rejected the hypothesis stating that the genome of parental species hybrid frogs co-exist with is always eliminated during oogenesis in diploid hybrids. Diploid hybrid frogs demonstrate an enlarged frequency of deviations in oogenesis comparatively to triploid hybrids. Typical for hybrid frogs deviations in gametogenesis increase variability of produced gametes and provide a mechanism for appearance of different forms of hybrids.Документ Sustainable coexistence of the parental species and hemiclonal interspecific hybrids is provided by the variety of ontogenetic strategies(Herpetological Facts Journal, 2015) Shabanov, D.; Usova, O.; Kravchenko, M.; Biriuk, O.; Leonov, A.; Korshunov, O.; Mair, Quentin; Meleshko, O.; Newman, Ju.; Vladymyrova, M.; Zholtkevych, G.Factors determining the sustainability of Hemiclonal Population Systems in which the interspecies hybrids Pelophylax esculentus complex coexist with members of parental species were studied using a combination of empirical data and computer simulation modeling. The empirical data demonstrates the existence of different intrapopulation strategies by partitioning a sample of individuals into two groups on the basis of their body size at a given age and comparing selected groups in terms of factors such as growth rate, life span, females’ fecundity and the age at which breeding commences. Then by using simulation modeling, we study the probable importance of intrapopulation ontogenetic strategies for the stability of Pelophylax esculentus complex HPS.Документ Cytological maps of lampbrush chromosomes of European water frogs (Pelophylax esculentus complex) from the Eastern Ukraine(BMC Genetics, 2013) Dedukh, D.; Mazepa, G.; Shabanov, D.; Rosanov, Ju.; Litvinchuk, S.; Borkin, L.; Saifitdinova, A.; Krasikova, A.Hybridogenesis (hemiclonal inheritance) is a kind of clonal reproduction in which hybrids between parental species are reproduced by crossing with one of the parental species. European water frogs (Pelophylax esculentus complex) represent an appropriate model for studying interspecies hybridization, processes of hemiclonal inheritance and polyploidization. P. esculentus complex consists of two parental species, P. ridibundus (the lake frog) and P. lessonae (the pool frog), and their hybridogenetic hybrid – P. esculentus (the edible frog). Parental and hybrid frogs can reproduce syntopically and form hemiclonal population systems. For studying mechanisms underlying the maintenance of water frog population systems it is required to characterize the karyotypes transmitted in gametes of parental and different hybrid animals of both sexes. In order to obtain an instrument for characterization of oocyte karyotypes in hybrid female frogs, we constructed cytological maps of lampbrush chromosomes from oocytes of both parental species originating in Eastern Ukraine. We further identified certain molecular components of chromosomal marker structures and mapped coilin-rich spheres and granules, chromosome associated nucleoli and special loops accumulating splicing factors. We recorded the dissimilarities between P. ridibundus and P. lessonae lampbrush chromosomes in the length of orthologous chromosomes, number and location of marker structures and interstitial (TTAGGG) n–repeat sites as well as activity of nucleolus organizer. Satellite repeat RrS1 was mapped in centromere regions of lampbrush chromosomes of the both species. Additionally, we discovered transcripts of RrS1 repeat in oocytes of P. ridibundus and P. lessonae. Moreover, G-rich transcripts of telomere repeat were revealed in association with terminal regions of P. ridibundus and P. lessonae lampbrush chromosomes.