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Fernandes LP, Rocha MN, Duarte CG, Minozzo JC, do Monte-Neto RL, Felicori LF. Validation of a colorimetric LAMP to detect Loxosceles experimental envenomation. Toxicon 2022; 216:50-56. [PMID: 35787893 DOI: 10.1016/j.toxicon.2022.06.017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2022] [Revised: 06/10/2022] [Accepted: 06/27/2022] [Indexed: 11/28/2022]
Abstract
Diagnostic tests for brown spider accidents are unavailable and impact treatment decisions, increasing costs and patient risks. In this work, we used for the first time a fast, simple, and visual method based on the loop-mediated isothermal amplification assay (LAMP) to detect Loxosceles envenomation. Using the DNA from L. similis legs, we observed a high sensitivity using this test since as low as 0.32 pg of DNA could be detected. This pH-dependent colorimetric assay was 64 times more sensitive than PCR to detect spider DNA. The test was specific for Loxosceles once no cross-reaction was observed when testing DNA from different agents that cause similar dermonecrotic injuries. The test allowed the detection of Loxosceles intermedia DNA from hair, serum, and exudate samples obtained from experimentally-envenomed rabbit within 72 h. The method sensitivity varied according to the sample and the collection time, reaching 100% sensitivity in serum and hair, respectively, 1 h and 24 h after the experimental envenomation. Due to its ease of execution, speed, sensitivity, and specificity, LAMP presents an excellent potential for identifying Loxosceles spp. Envenomation. This can reduce the burden on the Health System and the morbidity for the patient by implementing the appropriate therapy immediately.In addition, this work opens up the perspective to other venomous animal accident identification using LAMP.
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Affiliation(s)
- Luana Paula Fernandes
- Laboratory of Synthetic Biology and Biomimetics, Departamento de Bioquímica e Imunologia, Universidade Federal de Minas Gerais, Belo Horizonte, MG, 31270-901, Brazil
| | - Marcele Neves Rocha
- Laboratory of Synthetic Biology and Biomimetics, Departamento de Bioquímica e Imunologia, Universidade Federal de Minas Gerais, Belo Horizonte, MG, 31270-901, Brazil
| | - Clara Guerra Duarte
- Centro de Pesquisa e Desenvolvimento, Fundação Ezequiel Dias, 30510-010, Belo Horizonte, MG, Brazil
| | - João Carlos Minozzo
- Production and Research Centre of Immunobiological Products, Department of Health of the State of Paraná, Piraquara 83302-200, Brazil
| | - Rubens L do Monte-Neto
- Biotechnology Applied to Patogens (BAP) - Instituto René Rachou - Fundação Oswaldo Cruz, Belo Horizonte, 30190-009, Minas Gerais, Brazil
| | - Liza F Felicori
- Laboratory of Synthetic Biology and Biomimetics, Departamento de Bioquímica e Imunologia, Universidade Federal de Minas Gerais, Belo Horizonte, MG, 31270-901, Brazil.
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Zhang Y, Tanner NA. Improving RT-LAMP detection of SARS-CoV-2 RNA through primer set selection and combination. PLoS One 2022; 17:e0254324. [PMID: 35363770 PMCID: PMC8974972 DOI: 10.1371/journal.pone.0254324] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2021] [Accepted: 03/21/2022] [Indexed: 11/18/2022] Open
Abstract
Reverse transcription loop-mediated isothermal amplification (RT-LAMP) has emerged as a viable molecular diagnostic method to expand the breadth and reach of nucleic acid testing, particularly for SARS-CoV-2 detection and surveillance. While rapidly growing in prominence, RT-LAMP remains a relatively new method compared to the standard RT-qPCR, and contribution to our body of knowledge on designing LAMP primer sets and assays can have significant impact on its utility and adoption. Here we select and evaluate 18 LAMP primer sets for SARS-CoV-2 previously identified as sensitive ones under various conditions, comparing their speed and sensitivity with two LAMP formulations each with 2 reaction temperatures. We find that both LAMP formulations have some effects on the speed and detection sensitivity and identify several primer sets with similar high sensitivity for different SARS-CoV-2 gene targets. Significantly we observe a consistent sensitivity enhancement by combining primer sets for different targets, confirming and building on earlier work to create a simple, general approach to building better and more sensitive RT-LAMP assays.
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Affiliation(s)
- Yinhua Zhang
- Research Department, New England Biolabs, Ipswich, Massachusetts, United States of America
| | - Nathan A. Tanner
- Research Department, New England Biolabs, Ipswich, Massachusetts, United States of America
- * E-mail:
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3
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Londono-Avendano MA, Libreros G, Osorio L, Parra B. A Rapid RT-LAMP Assay for SARS-CoV-2 with Colorimetric Detection Assisted by a Mobile Application. Diagnostics (Basel) 2022; 12:diagnostics12040848. [PMID: 35453896 PMCID: PMC9032071 DOI: 10.3390/diagnostics12040848] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2021] [Revised: 01/12/2022] [Accepted: 01/21/2022] [Indexed: 02/04/2023] Open
Abstract
Loop-mediated amplification has been promoted for SARS-CoV-2 screening, however, antigen tests are preferred in low-income countries and remote zones. Poor training in molecular biology, plus the need for RNA purification or reading instruments to overcome issues of sensitivity in colorimetric detection, are some of the reasons limiting the use of this technique. In this study, nasopharyngeal swabs, aspirates and saliva were amplified in an in-house LAMP assay and subject to colorimetric detection, achieved by the naked eye and by image analysis with a mobile application. Accuracy of detection by the naked eye ranged from 61–74% but improved to 75–86% when using the application. Sensitivity of the digital approach was 81% and specificity 83%, with poor positive predictive value, and acceptable negative predictive value. Additionally to the reported effect of some transport media’s pH, the presence of mucus and warming up of reagents while setting up the reaction critically affected performance. Accuracy per type of sample was 55, 70 and 80%, for swabs, aspirates and saliva, respectively, suggesting potential to improve the test in saliva. This assay, carried out in a closed tube, reduces contamination, has few pipetting steps and requires minimal equipment. Strategies to improve performance and implications of the use this sort of colorimetric LAMP for massive testing are discussed.
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Affiliation(s)
- María Aurora Londono-Avendano
- Departamento de Microbiología, Escuela de Ciencias Básicas, Facultad de Salud, Universidad del Valle, Calle 4B # 36-00, edificio 120, oficina 223/229, Cali 760043, Colombia; (G.L.); (B.P.)
- Correspondence: ; Tel.: +573-3212100 (ext. 5205)
| | - Gerardo Libreros
- Departamento de Microbiología, Escuela de Ciencias Básicas, Facultad de Salud, Universidad del Valle, Calle 4B # 36-00, edificio 120, oficina 223/229, Cali 760043, Colombia; (G.L.); (B.P.)
| | - Lyda Osorio
- Escuela de Salud Pública, Facultad de Salud, Universidad del Valle, Calle 4B # 36-00, edificio 120, oficina 223/229, Cali 760043, Colombia;
| | - Beatriz Parra
- Departamento de Microbiología, Escuela de Ciencias Básicas, Facultad de Salud, Universidad del Valle, Calle 4B # 36-00, edificio 120, oficina 223/229, Cali 760043, Colombia; (G.L.); (B.P.)
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4
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Lai MY, Suppiah J, Thayan R, Ismail I, Mustapa NI, Soh TST, Hassan AH, Peariasamy KM, Lee YL, Lau YL. RNA purification-free detection of SARS-CoV-2 using reverse transcription loop-mediated isothermal amplification (RT-LAMP). Trop Med Health 2022; 50:2. [PMID: 34980275 PMCID: PMC8723997 DOI: 10.1186/s41182-021-00396-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2021] [Accepted: 12/27/2021] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Current diagnosis of SARS-CoV-2 infection relies on RNA purification prior to amplification. Typical extraction methods limit the processing speed and turnaround time for SARS-CoV-2 diagnostic testing. METHODS Here, we applied reverse transcription loop-mediated isothermal amplification directly onto human clinical swabs samples to amplify the RNA from SARS-CoV-2 swab samples after processing with chelating resin. RESULTS By testing our method on 64 samples, we managed to develop an RT-LAMP assay with 95.9% sensitivity (95% CI 86 to 99.5%) and 100% specificity (95% CI 78.2-100%). CONCLUSION The entire process including sample processing can be completed in approximately 50 min. This method has promising potential to be applied as a fast, simple and inexpensive diagnostic tool for the detection of SARS-CoV-2.
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Affiliation(s)
- Meng Yee Lai
- Department of Parasitology, Faculty of Medicine, University Malaya, 50603, Kuala Lumpur, Malaysia
| | - Jeyanthi Suppiah
- Virology Unit, Infectious Disease Research Centre, Institute for Medical Research, National Institutes of Health, Ministry of Health, Shah Alam, Selangor, Malaysia
| | - Ravindran Thayan
- Virology Unit, Infectious Disease Research Centre, Institute for Medical Research, National Institutes of Health, Ministry of Health, Shah Alam, Selangor, Malaysia
| | - Ilyiana Ismail
- Department of Pathology, Hospital Sungai Buloh, Ministry of Health, Sungai Buloh, Selangor, Malaysia
| | - Nur Izati Mustapa
- Department of Pathology, Hospital Sungai Buloh, Ministry of Health, Sungai Buloh, Selangor, Malaysia
| | - Tuan Suhaila Tuan Soh
- Department of Pathology, Hospital Sungai Buloh, Ministry of Health, Sungai Buloh, Selangor, Malaysia
| | - Afifah Haji Hassan
- Department of Pathology, Hospital Sungai Buloh, Ministry of Health, Sungai Buloh, Selangor, Malaysia
| | - Kalaiarasu M Peariasamy
- Institute for Clinical Research, National Institutes of Health, Ministry of Health, Shah Alam, Selangor, Malaysia
| | - Yee Leng Lee
- Clinical Research Centre, Hospital Sungai Buloh, Ministry of Health, Sungai Buloh, Selangor, Malaysia
| | - Yee Ling Lau
- Department of Parasitology, Faculty of Medicine, University Malaya, 50603, Kuala Lumpur, Malaysia.
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Affiliation(s)
- Yufan Zhang
- State Key Laboratory of Medicinal Chemical Biology, Frontiers Science Center for Cell Responses, Key Laboratory of Bioactive Materials, Ministry of Education, and College of Life Sciences Nankai University Tianjin China
| | - Dan Ding
- State Key Laboratory of Medicinal Chemical Biology, Frontiers Science Center for Cell Responses, Key Laboratory of Bioactive Materials, Ministry of Education, and College of Life Sciences Nankai University Tianjin China
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