Parthenogenesis in the genusSchistosoma: Electrophoretic evidence for this reproduction system inS. japonicum andS. mansoni

Imbert-Establet, D.; Mingyi, Xia; Jourdane, J.

doi:10.1007/bf00932672

Cited by 9 publications

(4 citation statements)

References 18 publications

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“…Finally, because F1 progeny only harbor the mother genotype, it can only infect the snail corresponding to the mother species (B. truncatus for S. bovis and B. glabrata for S. mansoni). A similar result has been observed in S. japonicum × S. mansoni crosses, where female S. japonicum × male S. mansoni can only infect Oncomelania hupensis snail while where female S. mansoni × male S. japonicum can only infect B. glabrata [36].…”

Section: Resultssupporting

confidence: 82%

Mating Interactions between Schistosoma bovis and S. mansoni and Compatibility of Their F1 Progeny with Biomphalaria glabrata and Bulinus truncatus

et al. 2022

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Contrary to the majority of other Trematoda, Schistosoma species are gonochoric. Consequently, in endemic areas where several schistosome species overlap and can co-infect the same definitive host, there may be frequent opportunities for interspecific pairing. Our experimental study provides novel insight on the pairing behavior between Schistosoma bovis and S. mansoni in mixed infections in mice. We used six mate choice experiments to assess mating interactions between the two schistosome species. We show that mating between the two Schistosoma species is not random and that S. mansoni exhibits greater mate recognition compared to S. bovis. We also performed reciprocal crosses (male S. mansoni × female S. bovis) and (female S. mansoni × male S. bovis) that produce active swimming miracidia. These miracidia were genotyped by ITS2 sequencing and proposed for mollusc infection. Molecular analyses show that all the miracidia are parthenogenetically produced (i.e., their harbor the mother ITS2 genotype) and as a consequence can only infect the mollusc of the maternal species. Offspring produced by male S. mansoni × female S. bovis pairing can only infect Bulinus truncatus whereas offspring produced by female S. mansoni × male S. bovis can only infect Biomphalaria glabrata snails. Evolutionary and epidemiological consequences are discussed.

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Section: Resultssupporting

confidence: 82%

Mating Interactions between Schistosoma bovis and S. mansoni and Compatibility of Their F1 Progeny with Biomphalaria glabrata and Bulinus truncatus

et al. 2022

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“…Within the S. haematobium species group, examples of hybridization either in humans or in animals are well documented (Pitchford 1961;Wright & Southgate, 1976;Burchard & Kern, 1985;Kriiger et al 1986;Rollinson et al 1990). Sexual interactions also exist between schistosome species belonging to different groups (Basch & Basch, 1984;Tchuem Tchuente et al 1993;Imbert-Establet, Xia & Jourdane, 1994). With regard to our model, the results showed that in mixed infections of 5. intercalatum and S. mansoni in the same definitive host, there is an homospecific mate preference.…”

Section: Sexual Interactionssupporting

confidence: 50%

Competitive exclusion in human schistosomes: the restricted distribution ofSchistosoma intercalatum

et al. 1996

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A study on the immune and mating interactions between Schistosoma intercalatum and S. mansoni has been carried out. The immunologically mediated interactions and mating patterns observed between the two species demonstrate that S. mansoni is competitively dominant over S. intercalatum. When S. mansoni females are absent, S. mansoni males are more competitive than S. intercalatum males at pairing with S. intercalatum females. The use of a mathematical model shows how the abundance of S. mansoni worms per host could dramatically affect the mating probability of S. intercalatum females with their homologous males. It appears that the competitive exclusion between these two species of schistosomes may probably be an important factor restricting the distribution of S. intercalatum in Africa.

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“…mansoni × male S . japonicum ) inside mammal hosts [39,40,45]. However, given the propensity of certain schistosome species to form interspecies hybrids [46], it is challenging to distinguish between genetic hybridization and true parthenogenesis.…”

Section: Discussionmentioning

confidence: 99%

Systematically improved in vitro culture conditions reveal new insights into the reproductive biology of the human parasite Schistosoma mansoni

2019

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Schistosomes infect over 200 million people. The prodigious egg output of these parasites is the sole driver of pathology due to infection, yet our understanding of sexual reproduction by schistosomes is limited because normal egg production is not sustained for more than a few days in vitro. Here, we describe culture conditions that support schistosome sexual development and sustained egg production in vitro. Female schistosomes rely on continuous pairing with male worms to fuel the maturation of their reproductive organs. Exploiting these new culture conditions, we explore the process of male-stimulated female maturation and demonstrate that physical contact with a male worm, and not insemination, is sufficient to induce female development and the production of viable parthenogenetic haploid embryos. We further report the characterization of a nuclear receptor (NR), which we call Vitellogenic Factor 1 (VF1), that is essential for female sexual development following pairing with a male worm. Taken together, these results provide a platform to study the fascinating sexual biology of these parasites on a molecular level, illuminating new strategies to control schistosome egg production.

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Parthenogenesis in the genusSchistosoma: Electrophoretic evidence for this reproduction system inS. japonicum andS. mansoni

Cited by 9 publications

References 18 publications

Mating Interactions between Schistosoma bovis and S. mansoni and Compatibility of Their F1 Progeny with Biomphalaria glabrata and Bulinus truncatus

Mating Interactions between Schistosoma bovis and S. mansoni and Compatibility of Their F1 Progeny with Biomphalaria glabrata and Bulinus truncatus

Competitive exclusion in human schistosomes: the restricted distribution ofSchistosoma intercalatum

Systematically improved in vitro culture conditions reveal new insights into the reproductive biology of the human parasite Schistosoma mansoni

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