Abstract
Background
Oncomelania hupensis hupensis is the only intermediate host of Schistosoma japonicum, the causative agent of schistosomiasis in China and is therefore of significant medical and veterinary health importance. Although tremendous progress has been achieved, there remains an understudied area of approximately 2.06 billion m2 of potential snail habitats. This area could be further increased by annual flooding. Therefore, an understanding of population genetics of snails in these areas may be useful for future monitoring and control activities.
Methods and results
We sampled snails from Hexian (HX), Zongyang (ZY) and Shitai (ST) in Anhui (schistosomiasis transmission control), and from Hengtang (HT), Taicang (TC), Dongsan (DS) and Xisan (XS) in Jiangsu (schistosomiasis transmission interrupted), downstream of Anhui. ST, DS and XS are classified as hilly and mountainous areas, and HX, ZY, TC and HT as lake and marshland areas. The mitochondrial cytochrome c oxidase subunit I gene were sequenced. Out of 115 snails analyzed, 29 haplotypes were identified. We observed 56 (8.72%) polymorphic sites consisting of 51 transitions, four transversions and one multiple mutational change. The overall haplotype and nucleotide diversity were 0.899 and 0.01569, respectively. Snail populations in Anhui had higher genetic diversity than in Jiangsu. 73.32% of total variation was distributed among sites and 26.68% within sites. Snails were significantly separated according to eco-epidemiological settings in both network and phylogenetic analyses.
Conclusion
Our results could provide important guidance towards assessing coevolutionary interactions of snails with S. japonicum, as well as for future molluscan host monitoring and control activities.
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Acknowledgements
We are very grateful to Prof. Joanne P. Webster from Royal Veterinary College, University of London for her great help in improving the quality of the English language in the article.
Funding
The authors are currently funded by the National Science Foundation of China (to DL, No. 81971957), by the Suzhou-2019′ 18th scientific and technological development projects (Minsheng Technology) (to ZZ, No. SS2019044).
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DL, JZ and MG contributed to the study conception and design. All authors performed the experiments. The first draft of the manuscript was written by JZ and MG, and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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11033_2021_6907_MOESM4_ESM.tiff
Supplementary Fig. S1 Phylogram of O. h. hupensis based on COX1 sequences. Values beside the branch represent posterior probabilities in which the node was recovered for NJ via 1000 bootstrap pseudo-replicates. The letters after each branch represent different haplotype individuals coded by Haplotype No. and its detailed sites. O. h. quadrasi was obtained from GenBank under accession No. LC276227.1 and was used as an out-group. (TIFF 2150 KB)
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Zhang, JY., Gu, MM., Yu, QF. et al. Genetic diversity and structure of Oncomelania hupensis hupensis in two eco-epidemiological settings as revealed by the mitochondrial COX1 gene sequences. Mol Biol Rep 49, 511–518 (2022). https://doi.org/10.1007/s11033-021-06907-8
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DOI: https://doi.org/10.1007/s11033-021-06907-8