The role of deleterious mutations in the stability of hybridogenetic water frog complexes

Bove, Pasquale; Milazzo, Paolo; Barbuti, Roberto

doi:10.1186/1471-2148-14-107

Cited by 9 publications

(3 citation statements)

References 70 publications

(64 reference statements)

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“…Christiansen [4] simulated reproduction of P. esculentus using deterministic model whereas our model allows modelling random events during animals' competition and breeding. The works of Bove et al [3] and Quilodran et al [12] are recent studies based on the simulation of water frogs' HPSs. These studies consider the stability of specific types of HPSs under certain conditions.…”

Section: Reproduction Within Hpssmentioning

confidence: 99%

Information and Communication Technologies in Education, Research, and Industrial Applications

2020

Communications in Computer and Information Science

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Studying any system requires development of ways to describe the variety of its conditions. Such development includes three steps. The first one is to identify groups of similar systems (associative typology). The second one is to identify groups of objects which are similar in characteristics important for their description (analytic typology). The third one is to arrange systems into groups based on their predicted common future (dynamic typology). We propose a method to build such a dynamic topology for a system. The first step is to build a simulation model of studied systems. The model must be undetermined and simulate stochastic processes. The model generates distribution of the studied systems output parameters with the same initial parameters. We prove the correctness of the model by aligning the parameters sets generated by the model with the set of the original systems conditions evaluated empirically. In case of a close match between the two, we can presume that the model is adequately describing the dynamics of the studied systems. On the next stage, we should determine the probability distribution of the systems transformation outcome. Such outcomes should be defined based on the simulation of the transformation of the systems during the time sufficient to determine its fate. If the systems demonstrate asymptotic behavior, its phase space can be divided into pools corresponding to its different future state prediction. A dynamic typology is determined by which of these pools each system falls into. We implemented the pipeline described above to study water frog hemiclonal population systems. Water frogs (Pelophylax esculentus complex) is an animal group displaying interspecific hybridization and non-mendelian inheritance.

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Section: Reproduction Within Hpssmentioning

confidence: 99%

Information and Communication Technologies in Education, Research, and Industrial Applications

2020

Communications in Computer and Information Science

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“…This is because clonal genomes are sheltered by sexual host genomes that prevent their occurrence in the homozygous state and reduce the predisposition to a certain disorder by their epistatic interactions (Vorburger et al, 2009). Counterintuitive, such deleterious mutations could be beneficial for hybrids by increasing their chances of mating with females of the sexual host (Bove, Milazzo and Barbuti, 2014).…”

Section: Morphology Of Hybrid Malesmentioning

confidence: 99%

Body size variation in hybrids among populations of European water frogs (Pelophylax esculentus complex) with different breeding systems

et al. 2020

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Abstract In some populations, hybrids reproduce with a parental species by eliminating the genome of this species from their own germline and produce gametes that only contain the genome of the other parental species (sexual host). This mode of reproduction, known as hybridogenesis, leads to a conflict of interest between the two parties because the sexual host should avoid mating with the hybrid to prevent a reduction in reproductive success, whereas the hybrid depends on such matings for survival. We investigated European water frogs (Pelophylax esculentus complex), including hybrids (P. esculentus, genotype LR) and two sexual host species (P. lessonae, LL and P. ridibundus, RR). We hypothesized that to maximize fitness, hybrid males should be morphologically more similar to the sexual host that is preferred by females for successful reproduction. To test this hypothesis, we compared hybrid males in two different population types, L-E (hybrids coexist with LL) and L-E-R (hybrids coexist with both LL and RR). The latter was described in terms of genome composition, sex ratio, and mate choice preferences; the sex ratio of hybrids was significantly male-biased. We found that LR males from the L-E-R populations were significantly larger than those from the L-E, which makes them more similar to P. ridibundus, the largest species within the P. esculentus complex. We suggest that a larger body size of hybrid males may provide a reproductive advantage in the L-E-R population type, where the most common type of pair caught in the breeding season was LR males × RR females.

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“…In the lessonae-esculentus system (L-E), common in Western Europe, LR hybrids exclude their L genome and produce clonal R gametes. Inter-hybrid crosses yield unviable RR offspring because the R hemiclone irreversibly accumulated deleterious mutations through Müller’s ratchet [12–14]. Pelophylax.…”

Section: Introductionmentioning

confidence: 99%

Population genomics of an exceptional hybridogenetic system of Pelophylax water frogs

Dubey

Maddalena²,

Bonny

et al. 2019

BMC Evol Biol

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Background Hybridogenesis can represent the first stage towards hybrid speciation where the hybrid taxon eventually weans off its parental species. In hybridogenetic water frogs, the hybrid Pelophylax kl. esculentus (genomes RL) usually eliminates one genome from its germline and relies on its parental species P. lessonae (genomes LL) or P. ridibundus (genomes RR) to perpetuate in so-called L-E and R-E systems. But not exclusively: some all-hybrid populations (E-E system) bypass the need for their parental species and fulfill their sexual cycle via triploid hybrid frogs. Genetic surveys are essential to understand the great diversity of these hybridogenetic dynamics and their evolution. Here we conducted such study using RAD-sequencing on Pelophylax from southern Switzerland (Ticino), a geographically-isolated region featuring different assemblages of parental P. lessonae and hybrid P. kl. esculentus . Results We found two types of hybridogenetic systems in Ticino: an L-E system in northern populations and a presumably all-hybrid E-E system in the closely-related southern populations, where P. lessonae was not detected. In the latter, we did not find evidence for triploid individuals from the population genomic data, but identified a few P. ridibundus (RR) as offspring from interhybrid crosses (LR × LR). Conclusions Assuming P. lessonae is truly absent from southern Ticino, the putative maintenance of all-hybrid populations without triploid individuals would require an unusual lability of genome elimination, namely that P. kl. esculentus from both sexes are capable of producing gametes with either L or R genomes. This could be achieved by the co-existence of L- and R- eliminating lineages or by “hybrid amphigamy”, i. e. males and females producing sperm and eggs among which both genomes are represented. These hypotheses imply that polyploidy is not the exclusive evolutionary pathway for hybrids to become reproductively independent, and challenge the classical view that hybridogenetic taxa are necessarily sexual parasites. Electronic supplementary material The online version of this article (10.1186/s12862-019-1482-4) contains supplementary material, which is available to authorized users.

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The role of deleterious mutations in the stability of hybridogenetic water frog complexes

Cited by 9 publications

References 70 publications

Information and Communication Technologies in Education, Research, and Industrial Applications

Information and Communication Technologies in Education, Research, and Industrial Applications

Body size variation in hybrids among populations of European water frogs (Pelophylax esculentus complex) with different breeding systems

Population genomics of an exceptional hybridogenetic system of Pelophylax water frogs

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