Abstract
Indoplanorbis exustus, a freshwater pulmonate snail, is widely distributed in tropical and subtropical zones and plays a significant role as an intermediate host for trematode parasites. Various genetic markers have been used for species identification and phylogenetic studies of this snail. However, there are limited studies about their molecular genetics based on nuclear ribosomal DNA (rDNA) genes. A genetic analysis of I. exustus in Thailand was conducted based on the nuclear 18S rDNA (339 bp) and 28S rDNA (1036 bp) genes. Indoplanorbis snails were collected from 29 localities in 21 provinces covering six regions of Thailand. Nucleotide sequences from 44 snails together with sequences from the GenBank database were examined for phylogenetic relationships and genetic diversity. All sequences of the selected nucleotide regions exhibited a high level of similarity (99%) to the sequences of I. exustus in the GenBank database. The maximum likelihood tree based on the 18S and 28S rDNA fragment sequences of I. exustus in Thailand revealed only one group with clear separation from another genus in the family Planorbidae. The I. exustus 28S rDNA sequences showed intraspecific genetic divergence ranging from 0 to 0.78% and were classified into 8 different haplotypes. Conversely, the 18S rDNA data showed lower variation than the 28S rDNA data and revealed a single haplotype and intraspecific distances of zero among all sampled individuals. The haplotype network of 28S rDNA sequences of I. exustus in Thailand revealed six unique haplotypes and two haplotypes shared by at least two regions. Overall, both markers were successful in the identification of I. exustus. However, these markers, particularly the 18S rDNA, may not be suitable for genetic analysis within the species, particularly for population genetic studies, due to their limited variation as seen in this study. In summary, this study not only enhances understanding of genetic variation in I. exustus but is also useful for the selection of molecular markers in future genetic research.
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We would like to thank the Department of Microbiology and Parasitology, Faculty of Medical Science, Naresuan University, for providing the necessary support and access to facilities.
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This study was supported by Naresuan University (NU) and the National Science, Research and Innovation Fund (NSRF), Thailand (grant no. R2566B046). This funding sponsor had no role in the design of the study.
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AD performed experiments, analyzed data, and wrote the paper. CS performed experiments and wrote the paper. JA performed experiments and wrote the paper. SP performed experiments and wrote the paper. CH performed experiments and wrote the paper. AT provided materials and wrote the paper. AV performed experiments, analyzed data, provided materials, and wrote the paper.
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Dumidae, A., Subkrasae, C., Ardpairin, J. et al. Genetic variation of the freshwater snail Indoplanorbis exustus (Gastropoda: Planorbidae) in Thailand, inferred from 18S and 28S rDNA sequences. Parasitol Res 123, 93 (2024). https://doi.org/10.1007/s00436-024-08120-5
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DOI: https://doi.org/10.1007/s00436-024-08120-5