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Datta P, Garg P, Rattan D, Bagga R, Rohilla M, Khurana S, Sehgal R. Comparison of B1 and RE 529 gene targets by real time PCR and LAMP assay for diagnosis of toxoplasmosis in pregnant females. Indian J Med Microbiol 2024; 47:100481. [PMID: 37924678 DOI: 10.1016/j.ijmmb.2023.100481] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2023] [Revised: 09/09/2023] [Accepted: 09/12/2023] [Indexed: 11/06/2023]
Abstract
PURPOSE The aim of this study is to accurately diagnose the presence of toxoplasmosis in pregnant women. In this study we evaluated two gene targets B1 and RE-529 using two different molecular methods i.e., real-time PCR and LAMP. PROCEDURE A total of 150 blood samples were collected from pregnant women attending the PGIMER outpatient clinic. The serum and Buffy layer were extracted and various serological (ELISA) and molecular tests (qPCR and LAMP) targeting B1 and RE-529 were carried out. FINDING Out of 150 patients, 32 were seropositive. Amongst which for the RE-529 gene, 18 were LAMP positive and 16 were qPCR positive, while for the B1 gene, 14 were LAMP positive and 13 were qPCR positive. CONCLUSIONS Molecular methods were more sensitive than serological tests to diagnose congenital toxoplasmosis in antenatal females. Few seronegative patients were reported positive using molecular methods. In addition, LAMP targeting the RE-529 gene is more sensitive than qPCR, and LAMP targets the B1 gene.
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Affiliation(s)
- Priya Datta
- Department of Medical Parasitology, PGIMER, Chandigarh, 160012, India.
| | - Puja Garg
- Department of Medical Parasitology, PGIMER, Chandigarh, 160012, India.
| | - Divya Rattan
- Department of Medical Parasitology, PGIMER, Chandigarh, 160012, India.
| | - Rashmi Bagga
- Department of Obstetrics and Gynaecology, PGIMER, Chandigarh, 160012, India.
| | - Minakshi Rohilla
- Department of Obstetrics and Gynaecology, PGIMER, Chandigarh, 160012, India.
| | - Sumeeta Khurana
- Department of Medical Parasitology, PGIMER, Chandigarh, 160012, India.
| | - Rakesh Sehgal
- Department of Medical Parasitology, PGIMER, Chandigarh, 160012, India.
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Sheng L, Xue Q, Xu S, Can F, Yao N, Zou M, Teng Q, Li Y, El-Ashram S, Ji Y, Zhao J. Rapid and visual detection of Toxoplasma gondii oocyst in cat feces using loop-mediated isothermal amplification (LAMP) assay. Sci Rep 2023; 13:17269. [PMID: 37828080 PMCID: PMC10570283 DOI: 10.1038/s41598-023-44658-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2023] [Accepted: 10/11/2023] [Indexed: 10/14/2023] Open
Abstract
Toxoplasma gondii is an obligate parasitic protozoon that transmits to animals and humans via ingested food. Cats that act as T. gondii's final hosts play a critical role in T. gondii transmission by shedding millions of oocysts. Timely diagnosis of infected cats is essential for preventing toxoplasmosis because oocysts are a putative T. gondii source in epidemiology. We developed a new visual LAMP assay targeting the B1 gene to analyze single oocysts in cat feces in this study. The amplification result could be visually estimated based on the color change. LAMP assay analytical sensitivity was 101 copies/µL for the B1 gene plasmid, which was tenfold better than the PCR reaction. There were no cross-reactions with other parasites. The LAMP assay can detect a single T. gondii oocyst in 200 mg of cat feces. The LAMP assay detected a single oocyst in 200 mg cat feces at a higher rate than the PCR assay (83.3% vs. 50.0%).
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Affiliation(s)
- Lingwei Sheng
- Medical Laboratory Science, Wannan Medical College, Wuhu, 241002, Anhui, China
| | - Qiqi Xue
- Department of Medical Parasitology, Wannan Medical College, Wuhu, 241002, Anhui, China
| | - Sijia Xu
- Medical Laboratory Science, Wannan Medical College, Wuhu, 241002, Anhui, China
| | - Fang Can
- School of Public Health, Wannan Medical College, Wuhu, 241002, Anhui, China
| | - Ning Yao
- School of Public Health, Wannan Medical College, Wuhu, 241002, Anhui, China
| | - Minghui Zou
- Department of Medical Parasitology, Wannan Medical College, Wuhu, 241002, Anhui, China
| | - Qiao Teng
- Department of Medical Parasitology, Wannan Medical College, Wuhu, 241002, Anhui, China
| | - Yuanyuan Li
- Department of Medical Parasitology, Wannan Medical College, Wuhu, 241002, Anhui, China
| | - Saeed El-Ashram
- College of Life Science and Engineering, Foshan University, Foshan, 528231, Guangdong, China
- Faculty of Science, Kafrelsheikh University, Kafr El-Sheikh, 33516, Egypt
| | - Yongsheng Ji
- Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, 230026, Anhui, China.
| | - Jinhong Zhao
- Department of Medical Parasitology, Wannan Medical College, Wuhu, 241002, Anhui, China.
- Anhui Provincial Key Laboratory of Biological Macro-Molecules, Wuhu, 241002, Anhui, China.
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Wu Y, Zhang Y, Zhu ZW, Xue QQ, Zou MH, Sun M, Li YY, Zhao JH. Rapid and Visual Detection of Toxoplasma gondii in Blood Samples from Pet Cats and Dogs by Loop-Mediated Isothermal Amplification. Vector Borne Zoonotic Dis 2022; 22:512-519. [PMID: 36201229 DOI: 10.1089/vbz.2022.0001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Background: Toxoplasma gondii is an obligate intracellular parasite that invades nearly all nucleated cells of a broad spectrum of vertebrate hosts, and which may cause serious disease in immunocompromised patients, as well as in the immunologically incompetent fetus. This study aimed to establish a loop-mediated isothermal amplification (LAMP) technique to rapidly detect T. gondii in the blood infection by targeting the 529 bp repeat element of T. gondii. Methods: A turbidity monitoring system, together with visual reagent, was used to test the amplification result of the LAMP assay. In addition, the specificity and sensitivity of the LAMP assay were measured. Results: The results suggest that the successfully established LAMP assay profile can detect the DNA of T. gondii at 67°C within 40 min. The limit of detection of the LAMP assay was 101 copies/μL. No cross reaction occurred with Plasmodium vivax, Toxocara cati, Clonorchis sinensi, Spirometra mansoni or Cryptosporidium parvum. We validated the developed LAMP assay by detecting T. gondii in DNA extracted from 353 blood samples collected from domestic cats and dogs. The percentages of positive results in detecting these blood samples by LAMP and conventional PCR were 5.38% and 2.83%, respectively. Conclusions: Our findings show that the developed LAMP assay offers higher analytical sensitivity than conventional PCR and good analytical specificity, minimizes aerosol contamination, and can be applied to on-site rapid detection of T. gondii.
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Affiliation(s)
- Yan Wu
- School of Medical Laboratory Science, Wannan Medical College, Wuhu, China
| | - Yan Zhang
- School of Medical Laboratory Science, Wannan Medical College, Wuhu, China
| | - Zhi-Wei Zhu
- Department of Medical Parasitology, Wannan Medical College, Wuhu, China
| | - Qi-Qi Xue
- Department of Medical Parasitology, Wannan Medical College, Wuhu, China
| | - Ming-Hui Zou
- Department of Medical Parasitology, Wannan Medical College, Wuhu, China
| | - Ming Sun
- Tiantian Pet Hospital, Wuhu, China
| | - Yuan-Yuan Li
- Department of Medical Parasitology, Wannan Medical College, Wuhu, China
| | - Jin-Hong Zhao
- Department of Medical Parasitology, Wannan Medical College, Wuhu, China.,Anhui Provincial Key Laboratory of Biological Macromolecules, Wuhu, China
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