Establishment and preliminary application of a recombinase-aided isothermal amplification assay-based multiplex nucleic acid assay for detection of three Echinococcus species
10.16250/j.32.1374.2021094
- VernacularTitle:基于重组酶介导等温扩增技术的3种棘球绦虫 核酸检测方法的建立及初步应用
- Author:
Xue-Yong ZHANG
1
,
2
;
Ying-Na JIAN
1
,
2
;
Zhi-Hong GUO
3
;
Hong DUO
3
;
Yan-Ming WEI
1
Author Information
1. College of Veterinary Medicine, Gansu Agricultural University, Lanzhou 730070, China
2. Qinghai Academy of Animal Sciences and Veterinary Medicine, Qinghai University, China
3. Qinghai Academy of Animal Sciences and Veterinary Medicine, Qinghai University, China
- Publication Type:Journal Article
- Keywords:
Echinococcus multilocularis;
Echinococcus granulosus;
Echinococcus shiquicus;
Recombinase-aided isothermal amplification assay;
Multiplex nucleic acid detection
- From:
Chinese Journal of Schistosomiasis Control
2021;33(4):339-345
- CountryChina
- Language:Chinese
-
Abstract:
Objective To establish a multiplex nucleic acid assay for rapid detection of Echinococcus multilocularis, E. granulosus and E. shiquicus based on the recombinase-aided isothermal amplification assay (RAA) and to preliminarily assess its diagnostic efficiency. Methods The mitochondrial genomic sequences of E. multilocularis (GenBank accession number: NC_000928), E. granulosus (GenBank accession number: NC_044548) and E. shiquicus (GenBank accession number: NC_009460) were used as target sequences, and three pairs of primers were designed based on the RAA primer design principle and synthesized for the subsequent multiple RAA amplification. The genomic DNA of E. multilocularis, E. granulosus and E. shiquicus at different concentrations and the recombinant plasmids containing the target gene at various concentrations were amplified to evaluate the diagnostic sensitivity of the multiplex RAA assay, and the genomic DNA of E. multilocularis, E. granulosus, E. shiquicus, Taenia multiceps, T. saginata, T. asiatica, Dipylidium caninum, T. hydatigena, Toxocara canis, Fasciola hepatica, T. pisiformis, Mesocestoides lineatus and Cryptosporidiumn canis was detected using the multiplex RAA assay to evaluate its specificity. In addition, the reaction condition of the multiplex RAA assay was optimized, and was then employed to detect the tissues with echinococcosis lesions, simulated canine fecal samples and field captured fox fecal samples to examine its application values. Results The multiplex RAA assay was effective to specifically amplify the mitochondrial gene fragments of E. multilocularis, E. granulosus and E. shiquicus within 40 min at 39 °C, with sequence lengths of 540, 430 bp and 200 bp, respectively. This multiplex RAA assay showed the minimum detection limits of 2.0, 2.5 pg/μL and 3.1 pg/μL for detection of the genomic DNA of E. multilocularis, E. granulosus and E. shiquicus, and presented the minimum detection limit of 200 copies/μL for detection of the recombinant plasmids containing E. multilocularis, E. granulosus and E. shiquicus target genes. This multiplex RAA assay was effective to simultaneously detect single and multiple infections with E. multilocularis, E. granulosus and E. shiquicus, but failed to amplify the genomic DNA of T. multiceps, T. saginata, T. asiatica, D. caninum, T. hydatigena, T. canis, F. hepatica, T. pisiformis, M. lineatus and C. canis. In addition, the optimized multiplex RAA assay was effective to detect all positive samples from the tissue samples with echinococcosis lesions, simulated canine fecal samples and field captured fox fecal samples, which was fully consistent with the detection of the single PCR assay. Conclusion A sensitive and specific multiplex nucleic acid assay for rapid detection of E. multilocularis, E. granulosus and E. shiquicus has been successfully established.
