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Molecular characterization and immunological properties of Echinococcus granulosus sensu stricto (G1) ADK1 and ADK8

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Abstract

Adenylate kinases (ADKs) are one of the important enzymes regulating adenosine triphosphate (ATP) metabolism in Echinococcus granulosus sensu lato. The objective of the present study was to explore the molecular characteristics and immunological properties of E. granulosus sensu stricto (G1) adenylate kinase 1 (EgADK1) and adenylate kinase 8 (EgADK8). EgADK1 and EgADK8 were cloned and expressed, and the molecular characteristics of EgADK1 and EgADK8 were analyzed through different bioinformatics tools. Western blotting was used to examine the reactogenicity of recombinant adenylate kinase 1 (rEgADK1) and recombinant adenylate kinase 8 (rEgADK8) and to evaluate their diagnostic value. The expression profiles of EgADK1 and EgADK8 in 18-day-old strobilated worms and protoscoleces were analyzed by quantitative real-time PCR, and their distribution in 18-day-old strobilated worms, the germinal layer, and protoscoleces was determined by immunofluorescence localization. EgADK1 and EgADK8 were successfully cloned and expressed. Bioinformatics analysis predicted that EgADK1 and EgADK8 have multiple phosphorylation sites and B-cell epitopes. Compared with EgADK8, EgADK1 and other parasite ADKs have higher sequence similarity. In addition, both cystic echinococcosis (CE)–positive sheep sera and Cysticercus tenuicollis–infected goat sera could recognize rEgADK1 and rEgADK8. EgADK1 and EgADK8 were localized in protoscoleces, the germinal layer, and 18-day-old strobilated worms. EgADK1 and EgADK8 showed no significant difference in their transcription level in 18-day-old strobilated worms and protoscoleces, suggesting that EgADK1 and EgADK8 may play an important role in the growth and development of E. granulosus sensu lato. Since EgADK1 and EgADK8 can be recognized by other parasite-positive sera, they are not suitable as candidate antigens for the diagnosis of CE.

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Acknowledgements

The authors thank Ning Wang, Cheng Guo, Maodi Wu, Lang Xiong, and Nengxing Shen (Sichuan Agricultural University) for their constructive suggestions on the manuscript preparation. We would like to thank the native English–speaking scientists of Elixigen Company (Huntington Beach, CA) for editing our manuscript.

Funding

This research was funded by the National Natural Science Foundation of China (Grant No. 31672547) and the Key Technology R&D Program of Sichuan Province, China (No. 2022YFN0013).

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Contributions

Guang-You Yang conceived and designed the study. Hong-Yu Song and Jia-Fei Zhan performed the experiments, analyzed the data, and wrote the manuscript. Rui-Qi Hua, Xue He, and Xiao-Di Du contributed to sample collection and performed the experiments. Jing Xu, Ran He, Xiao-Bin Gu, and Xue-Rong Peng contributed reagents/materials/analysis tools. Guang-You Yang and Yue Xie critically revised the manuscript. All authors read and approved the final version of the manuscript.

Corresponding author

Correspondence to Guang-You Yang.

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Ethics approval

The animal study was reviewed and approved by the Animal Care and Use Committee of Sichuan Agricultural University (SYXK2019-187). All animal procedures used in this study were carried out in accordance with the Guide for the Care and Use of Laboratory Animals (National Research Council, Bethesda, MD, USA) and recommendations of the ARRIVE guidelines (https://www.nc3rs.org.uk/arrive-guidelines). All methods were carried out in accordance with relevant guidelines and regulations.

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The authors declare no competing interests.

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Section Editor: Bruno Gottstein

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436_2023_7857_MOESM1_ESM.jpg

Supplementary file1 Fig. 1 Sequence alignment of ADK1 (a) and ADK8 (b) of E. granulosus s.s. (G1). GenBank accession numbers are shown in parentheses. (a) Eg: Echinococcus granulosus (CDS21649.1); Em: Echinococcus multilocularis (CDI97370.1); Ht: Hydatigera taeniaeformis (VDM30539.1); Hm: Hymenolepis microstoma (CDS32281.1); Mc: Mesocestoides corti (VDD80334.1); Ta: Taenia asiatica (VDK35971.1); Sm: Schistosoma mansoni (XP_018648199.1); Ss: Schistocephalus solidus (VDL93760.1); Fh: Fasciola hepatica (THD21832.1); Cs: Clonorchis sinensis (GAA27625.1). (b) Eg: Echinococcus granulosus (CDS20102.1); Em: Echinococcus multilocularis (CDI98446.); Ta: Taenia asiatica (VDK22632.1); Mc: Mesocestoides corti (VDD74805.1); Ss: Schistocephalus solidus (VDL91208.1); Hd: Hymenolepis diminuta (VUZ47486.1); Cs: Clonorchis sinensis (RJW60895.1); Sj: Schistosoma japonicum (TNN19731.1); Fh: Fasciola hepatica (THD23244.1); Hm: Hymenolepis microstoma (CDS28946.1). (JPG 5471 KB)

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Song, HY., Zhan, JF., Hua, RQ. et al. Molecular characterization and immunological properties of Echinococcus granulosus sensu stricto (G1) ADK1 and ADK8. Parasitol Res 122, 1557–1565 (2023). https://doi.org/10.1007/s00436-023-07857-9

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