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GPCR and IR genes in Schistosoma mansoni miracidia
Journal article   Open access   Peer reviewed

GPCR and IR genes in Schistosoma mansoni miracidia

Di Liang, Min Zhao, Tianfang Wang, Donald P McManus and Scott F Cummins
Parasites & vectors, Vol.9, 563
2016
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url
https://doi.org/10.1186/s13071-016-1837-2View
Published Version

Abstract

schistosoma mansoni G protein-coupled receptor ionotropic receptor biomphalaria glabrata
Background: Schistosoma species are responsible for the disease schistosomiasis, a highly prevalent helminthic disease that requires a freshwater snail as intermediate host. The S. mansoni free-living miracidium must utilize olfaction to find a suitable snail host, and certain types of rhodopsin G protein-coupled receptors (GPCRs) and ionotropic receptors (IRs) have been identified as olfactory receptors in other animal phyla. The Schistosoma genome project, together with the recent availability of proteomic databases, allowed for studies to explore receptors within S. mansoni, some of which may contribute to host finding. Results: We have identified 17 rhodopsin-type GPCR sequences in S. mansoni belonging to four subclasses, including ligand-specific GPCRs (i.e. neuropeptide and opsin). RT-PCR demonstrated the expression of nine out of the 17 GPCRs in the free-living miracidia, each of which have been characterized for homology to S. haematobium. Among the nine GPCRs, two are predicted as Gq-opsins. We also describe the characterization of a Schistosoma-encoded IR based on similarity with other species IR and conservation of IR-like domains. Schistosoma mansoni IR is expressed in miracidia at 3 and 6 h post-hatch. Conclusions: The identification of receptors in S. mansoni miracidia, presented here, contributes not only to further understanding of Schistosoma biology and signal transduction but also provides a basis for approaches that may modify parasite behaviour.

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