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Kong Q, Zhuo X, Yang X, Ding H, Ding J, Lou D, Tong Q, Wu Z, Lu S. Early Detection of Trichinella spiralis DNA in Rat Feces Based on Tracing Phosphate Ions Generated During Loop-Mediated Isothermal Amplification. J Parasitol 2021; 107:141-146. [PMID: 33662114 DOI: 10.1645/19-137] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
Early diagnosis of trichinellosis is still difficult because of the lack of specific symptoms and limited window for serological detection. Here we established an assay based on tracing phosphate ions generated during loop-mediated isothermal amplification (LAMP) to detect Trichinella spiralis DNA in rat feces during its early stage of infection. By targeting a 1.6-kb repetitive element of Tri. spiralis, the assay was able to detect Tri. spiralis DNA in the feces of all infected rats as early as 1 day postinfection (dpi). The positive detection lasted to 7 dpi in the rats infected with 250 muscle larvae, and 21 dpi in the rats infected with 5,000 larvae. The assay was highly sensitive, and could detect 1.7 femtograms (fg) of Tri. spiralis DNA with high specificity, and with no cross reactivity with the DNA from Anisakis pegreffii, Gnathostoma spinigerum, Angiostrongylus cantonensis, Enterobius vermicularis, Schistosoma japonicum, and Trypanosoma evansi. Our present study provided a reliable technique for the early diagnosis of trichinellosis with the advantages of simplicity and speed, as well as high sensitivity and specificity.
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Affiliation(s)
- Qingming Kong
- Department of Immunity and Biochemistry, Institute of Parasitic Disease, Hangzhou Medical College, Hangzhou, 310053, China
| | - Xunhui Zhuo
- Department of Immunity and Biochemistry, Institute of Parasitic Disease, Hangzhou Medical College, Hangzhou, 310053, China
| | - Xiaodi Yang
- Department of Microbiology and Parasitology, Anhui Key Laboratory of Infection and Immunity, Bengbu Medical College, Bengbu, 233030, China
| | - Haojie Ding
- Department of Immunity and Biochemistry, Institute of Parasitic Disease, Hangzhou Medical College, Hangzhou, 310053, China
| | - Jianzu Ding
- Department of Immunity and Biochemistry, Institute of Parasitic Disease, Hangzhou Medical College, Hangzhou, 310053, China
| | - Di Lou
- Department of Immunity and Biochemistry, Institute of Parasitic Disease, Hangzhou Medical College, Hangzhou, 310053, China
| | - Qunbo Tong
- Department of Immunity and Biochemistry, Institute of Parasitic Disease, Hangzhou Medical College, Hangzhou, 310053, China
| | - Zhiliang Wu
- Department of Parasitology, Gifu University Graduate School of Medicine, Yanagido 1-1, Gifu 501-1194, Japan
| | - Shaohong Lu
- Department of Immunity and Biochemistry, Institute of Parasitic Disease, Hangzhou Medical College, Hangzhou, 310053, China
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Tantrawatpan C, Saijuntha W, Manochantr S, Kheolamai P, Thanchomnang T, Sadaow L, Intapan PM, Maleewong W. A singleplex real-time fluorescence resonance energy transfer PCR with melting curve analysis for the differential detection of Paragonimus heterotremus, Echinostoma malayanum and Fasciola gigantica eggs in faeces. Trans R Soc Trop Med Hyg 2016; 110:74-83. [PMID: 26740365 DOI: 10.1093/trstmh/trv098] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
BACKGROUND Because the eggs of Paragonimus, Echinostoma and Fasciola are very similar in size and shape, it is difficult to distinguish and accurately identify species by the morphology of their eggs, which is a standard diagnostic method. METHODS In this study, a novel assay combining a real-time fluorescence resonance energy transfer PCR and melting curve analysis using one set of primers and fluorophore-labelled hybridization probes specific for the 28S rDNA region was developed for the molecular detection of Paragonimus heterotremus, Echinostoma malayanum and Fasciola gigantica eggs. RESULTS This assay could detect and distinguish P. heterotremus, E. malayanum and F. gigantica DNA with the distinct melting temperature (Tm) values of 57.99±0.08, 62.12±0.15 and 74.10±0.18, respectively. The assay can also be used to detect and distinguish DNA from P. bangkokensis, P. harinasutai, P. machorchis, E. revolutum, Hypodereum conoideum and F. hepatica, which have different Tm values. The sensitivity of this assay enabled the detection of one egg of P. heterotremus, E. malayanum or F. gigantica per 100 mg of faeces. In addition, the specificity testing showed no fluorescence signal for other parasites. CONCLUSIONS Due to the sensitivity and specificity of our assay in detecting P. heterotremus, E. malayanum and F. gigantica, our method could be used to accurately diagnose these three medically important parasitic groups and has potential implications for molecular epidemiological investigations of human and/or animal infections.
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Affiliation(s)
- Chairat Tantrawatpan
- Division of Cell Biology, Department of Preclinical Sciences, Faculty of Medicine, Thammasat University, Pathumthani, Thailand Center of Excellence in Stem Cell Research, Thammasat University, Pathumthani, Thailand Research and Diagnostic Center for Emerging Infectious Diseases, Khon Kaen University, Khon Kaen, Thailand
| | - Weerachai Saijuntha
- Walai Rukhavej Botanical Research Institute (WRBRI), Mahasarakham University, Maha Sarakham, Thailand
| | - Sirikul Manochantr
- Division of Cell Biology, Department of Preclinical Sciences, Faculty of Medicine, Thammasat University, Pathumthani, Thailand Center of Excellence in Stem Cell Research, Thammasat University, Pathumthani, Thailand
| | - Pakpoom Kheolamai
- Division of Cell Biology, Department of Preclinical Sciences, Faculty of Medicine, Thammasat University, Pathumthani, Thailand Center of Excellence in Stem Cell Research, Thammasat University, Pathumthani, Thailand
| | - Tongjit Thanchomnang
- Research and Diagnostic Center for Emerging Infectious Diseases, Khon Kaen University, Khon Kaen, Thailand Faculty of Medicine, Mahasarakham University, Mahasarakham, Thailand
| | - Lakkhana Sadaow
- Research and Diagnostic Center for Emerging Infectious Diseases, Khon Kaen University, Khon Kaen, Thailand Department of Parasitology, Faculty of Medicine, Khon Kaen University, Khon Kaen, Thailand
| | - Pewpan M Intapan
- Research and Diagnostic Center for Emerging Infectious Diseases, Khon Kaen University, Khon Kaen, Thailand Department of Parasitology, Faculty of Medicine, Khon Kaen University, Khon Kaen, Thailand
| | - Wanchai Maleewong
- Research and Diagnostic Center for Emerging Infectious Diseases, Khon Kaen University, Khon Kaen, Thailand Department of Parasitology, Faculty of Medicine, Khon Kaen University, Khon Kaen, Thailand
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Gao F, Wang R, Liu M. Trichinella spiralis, potential model nematode for epigenetics and its implication in metazoan parasitism. Front Physiol 2014; 4:410. [PMID: 24454291 PMCID: PMC3887316 DOI: 10.3389/fphys.2013.00410] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2013] [Accepted: 12/26/2013] [Indexed: 01/02/2023] Open
Abstract
The recent discovery of DNA methylation in the nematode T.spiralis may raise the possibility of using it as a potential model organism for epigenetic studies instead of C. elegans, which is deficient in this important epigenetic modification. In contrast to the free-living nematode C. elegans, T. spiralis is a parasitic worm that possesses a complicated life cycle and undergoes a complex developmental regulation of genes. We emphasize that the differential methylomes in the different life-history stages of T. spiralis can provide insight on how DNA methylation is triggered and regulated. In particular, we have demonstrated that DNA methylation is involved in the regulation of its parasitism-related genes. Further computational analyses indicated that the regulatory machinery for DNA methylation can also be found in the T. spiralis genome. By a logical extension of this point, we speculate that comprehensively addressing the epigenetic machinery of T. spiralis may help to understand epigenetics in invertebrates. Furthermore, considering the implication of epigenetics in metazoan parasitism, using T. spiralis as an epigenetic model organism may further contribute to drug development against metazoan parasites.
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Affiliation(s)
- Fei Gao
- Science and Technology Department, BGI-Shenzhen, Beishan Industrial Zone Shenzhen, China
| | - Rui Wang
- Science and Technology Department, BGI-Shenzhen, Beishan Industrial Zone Shenzhen, China
| | - Mingyuan Liu
- Key Lab for Zoonosis Research, Ministry of Education, Institute of Zoonosis, Jilin University Changchun, China ; Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses Yangzhou, China
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