Korean J Parasitol.  2020 Dec;58(6):635-645. 10.3347/kjp.2020.58.6.635.

Morphological and Molecular Characteristics of Clinostomid Metacercariae from Korea and Myanmar

Affiliations
  • 1Departments of Parasitology and Tropical Medicine, Chonnam National University Medical School, Gwangju 61469, Korea
  • 2Institute of Parasitic Diseases, Korea Association of Health Promotion, Seoul 07649, Korea
  • 3Department of Tropical Medicine and Parasitology, Seoul National University College of Medicine, Seoul 03080, Korea
  • 4Department of Parasitology and Tropical Medicine, and Institute of Health Sciences, Gyeongsang National University College of Medicine, Jinju 52727, Korea

Abstract

Morphological and molecular characterization of clinostomid metacercariae (CMc) was performed with the specimens collected in fish from Korea and Myanmar. Total 6 batches of clinostomid specimens by the fish species and geographical localities, 5 Korean and 1 Myanmar isolates, were analyzed with morphological (light microscopy and SEM) and molecular methods (the cytochrome c oxidase 1 gene and internal transcribed spacer 1/5.8S rRNA sequence). There were some morphological variations among CMc specimens from Korea. However, some morphometrics, i.e., the size of worm body and each organ, ratio of body length to body width, and morphology of cecal lumens, were considerably different between the specimens from Korea and Myanmar. The surface ultrastructures were somewhat different between the specimens from Korea and Myanmar. The CO1 sequences of 5 Korean specimens ranging 728-736 bp showed 99.6-100% identity with Clinostomum complanatum (GenBank no. KM923964). They also showed 99.9-100% identity with C. complanatum (FJ609420) in the ITS1 sequences ranging 692-698 bp. Meanwhile, the ITS1 sequences of Myanmar specimen showed 99.9% identity with Euclinostomum heterostomum (KY312847). Five sequences from Korean specimens clustered with the C. complanatum genes, but not clustered with Myanmar specimens. Conclusively, it was confirmed that CMc from Korea were morphologically and molecularly identical with C. complanatum and those from Myanmar were E. heterostomum.

Keyword

clinostomid fluke; metacercaria; morphology; molecular analysis; Korea; Myanmar
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