Objective: To characterize a species of the genus and parasitized trematodes in schistosomiasis-endemic areas of Yunnan Province using a molecular analysis, so as to understand their taxonomic positions.
Methods: spp. and snails were collected from Xiangyun County, Yunnan Province, and cercaria parasitizing snails were observed using crushing followed by microscopy. Cercaria parasitizing snails at various morphologies were sampled using a shedding method. Genomic DNA was extracted from snail soft tissues and cercariae, and the , , genes in snails and the and genes in cercariae were amplified using a PCR assay and sequenced. The species of snails and their parasitized trematodes was characterized using sequence alignment and phylogenetic analysis.
Results: Among 382 snails detected, there were three types of trematode cercariae found, including the non-forked (20.94%, 80/382), double-forked (3.40%, 13/382) and swallow shapes (7.07%, 27/382). Sequence and phylogenetic analyses showed that the , and gene sequences of this species of had high homology to those in , and were clustered in a branch. Sequencing analysis of the and genes revealed that the non-forked cercariae belonged to the family Pleu- rogenidae, the swallow-shaped cercariae belonged to the family Opecoelidae, and the double-forked cercariae belonged to another species of the genus that was different from and .
Conclusions: The species and taxonomy of spp. and their parasitized trematodes are preliminarily determined in schistosomiasis-endemic areas of Yunnan Province; however, further studies are required to investigate the more definite taxonomy and pathogenicity.
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Article Synopsis
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