Abstract
Understanding the population structure of Fasciola flukes in domestic and wild animals is important for determining the extent of cross-infection between them. Although the parthenogenetic Fasciola flukes in Japan have been shown to comprise five genetic types based on the ribosomal internal transcribed spacer 1 (ITS1) and mitochondrial NADH dehydrogenase subunit 1 (nad1) regions, these genetic regions are not suitable for analyzing their population structure. In the present study, the genetic diversity and population structure of the parthenogenetic Fasciola flukes in Japan were studied using microsatellite DNA, ITS1, and nad1 regions. A total of 144 parthenogenetic Fasciola flukes, obtained from cattle and sika deer in 16 localities, were individually analyzed using PCR-RFLP for ITS1, PCR-direct sequence analysis for nad1, and post-labeling PCR and capillary electrophoresis for microsatellite DNA regions. The flukes showed higher genetic diversity in the microsatellite DNA regions than ITS1 and nad1. The population structures of parthenogenetic Fasciola flukes were unclear, however, it was suggested that the flukes are more diverse populations. We hypothesized that their distribution throughout Japan is closely related to livestock movement dependent on human activity. Moreover, it is considered that cross-infection of the flukes between cattle and sika deer possibly has occurred in the past.
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The datasets analyzed during the current study available from the corresponding author on reasonable request.
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Acknowledgments
The research was supported by the staff of many slaughterhouses for the fluke collection. We are grateful to Assistant Professor Naoko Kitamoto and Assistant Professor Hideharu Tsukagoshi of the Department of Animal Risk Management, Faculty of Agriculture, Iwate University for helping with the microsatellite analysis.
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Ohari, Y., Matsuo, K., Yoshida, A. et al. Genetic diversity and population structure analyses based on microsatellite DNA of parthenogenetic Fasciola flukes obtained from cattle and sika deer in Japan. Parasitol Res 120, 1341–1350 (2021). https://doi.org/10.1007/s00436-021-07061-7
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DOI: https://doi.org/10.1007/s00436-021-07061-7