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Bravo-González S, González-González E, Perales-Salinas V, Rodríguez-Sánchez IP, Ortiz-Castillo JE, Vargas-Martínez A, Perez-Gonzalez VH, Luna-Aguirre CM, Trujillo-de Santiago G, Alvarez MM. Self-Diagnosis of SARS-CoV-2 from Saliva Samples at Home: Isothermal Amplification Enabled by Do-It-Yourself Portable Incubators and Laminated Poly-ethyl Sulfonate Membranes. Diagnostics (Basel) 2024; 14:221. [PMID: 38275468 PMCID: PMC10814948 DOI: 10.3390/diagnostics14020221] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2023] [Revised: 12/04/2023] [Accepted: 12/07/2023] [Indexed: 01/27/2024] Open
Abstract
COVID-19 made explicit the need for rethinking the way in which we conduct testing for epidemic emergencies. During the COVID-19 pandemic, the dependence on centralized lab facilities and resource-intensive methodologies (e.g., RT-qPCR methods) greatly limited the deployment of widespread testing efforts in many developed and underdeveloped countries. Here, we illustrate the development of a simple and portable diagnostic kit that enables self-diagnosis of COVID-19 at home from saliva samples. We describe the development of a do-it-yourself (DIY) incubator for Eppendorf tubes that can be used to conduct SARS-CoV-2 detection with competitive sensitivity and selectivity from saliva at home. In a proof-of-concept experiment, we assembled Eppendorf-tube incubators at our home shop, prepared a single-tube mix of reagents and LAMP primers in our lab, and deployed these COVID-19 detection kits using urban delivery systems (i.e., Rappifavor or Uber) to more than 15 different locations in Monterrey, México. This straightforward strategy enabled rapid and cost-effective at-home molecular diagnostics of SARS-CoV-2 from real saliva samples with a high sensitivity (100%) and high selectivity (87%).
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Affiliation(s)
- Sergio Bravo-González
- Centro de Biotecnología-FEMSA, Tecnologico de Monterrey, Monterrey 64849, NL, Mexico; (S.B.-G.); (E.G.-G.); (V.P.-S.); (C.M.L.-A.)
- Departamento de Bioingeniería, Tecnologico de Monterrey, Monterrey 64849, NL, Mexico
| | - Everardo González-González
- Centro de Biotecnología-FEMSA, Tecnologico de Monterrey, Monterrey 64849, NL, Mexico; (S.B.-G.); (E.G.-G.); (V.P.-S.); (C.M.L.-A.)
- Departamento de Bioingeniería, Tecnologico de Monterrey, Monterrey 64849, NL, Mexico
| | - Valeria Perales-Salinas
- Centro de Biotecnología-FEMSA, Tecnologico de Monterrey, Monterrey 64849, NL, Mexico; (S.B.-G.); (E.G.-G.); (V.P.-S.); (C.M.L.-A.)
- Departamento de Bioingeniería, Tecnologico de Monterrey, Monterrey 64849, NL, Mexico
| | - Iram Pablo Rodríguez-Sánchez
- Laboratorio de Fisiología Molecular y Estructural, Facultad de Ciencias Biológicas, Universidad Autónoma de Nuevo León, San Nicolás de los Garza 66455, NL, Mexico;
- Alfa Medical Center, Guadalupe 67100, NL, Mexico
| | - Jose E. Ortiz-Castillo
- Departamento de Ingeniería Mecátrónica y Eléctrica, Tecnologico de Monterrey, Monterrey 64849, NL, Mexico; (J.E.O.-C.); (A.V.-M.); (V.H.P.-G.)
| | - Adriana Vargas-Martínez
- Departamento de Ingeniería Mecátrónica y Eléctrica, Tecnologico de Monterrey, Monterrey 64849, NL, Mexico; (J.E.O.-C.); (A.V.-M.); (V.H.P.-G.)
| | - Victor H. Perez-Gonzalez
- Departamento de Ingeniería Mecátrónica y Eléctrica, Tecnologico de Monterrey, Monterrey 64849, NL, Mexico; (J.E.O.-C.); (A.V.-M.); (V.H.P.-G.)
| | - Claudia Maribel Luna-Aguirre
- Centro de Biotecnología-FEMSA, Tecnologico de Monterrey, Monterrey 64849, NL, Mexico; (S.B.-G.); (E.G.-G.); (V.P.-S.); (C.M.L.-A.)
- Departamento de Bioingeniería, Tecnologico de Monterrey, Monterrey 64849, NL, Mexico
| | - Grissel Trujillo-de Santiago
- Centro de Biotecnología-FEMSA, Tecnologico de Monterrey, Monterrey 64849, NL, Mexico; (S.B.-G.); (E.G.-G.); (V.P.-S.); (C.M.L.-A.)
- Departamento de Ingeniería Mecátrónica y Eléctrica, Tecnologico de Monterrey, Monterrey 64849, NL, Mexico; (J.E.O.-C.); (A.V.-M.); (V.H.P.-G.)
| | - Mario Moisés Alvarez
- Centro de Biotecnología-FEMSA, Tecnologico de Monterrey, Monterrey 64849, NL, Mexico; (S.B.-G.); (E.G.-G.); (V.P.-S.); (C.M.L.-A.)
- Departamento de Ingeniería Mecátrónica y Eléctrica, Tecnologico de Monterrey, Monterrey 64849, NL, Mexico; (J.E.O.-C.); (A.V.-M.); (V.H.P.-G.)
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Strachan S, Chakraborty M, Sallam M, Bhuiyan SA, Ford R, Nguyen NT. Maximising Affordability of Real-Time Colorimetric LAMP Assays. MICROMACHINES 2023; 14:2101. [PMID: 38004958 PMCID: PMC10673270 DOI: 10.3390/mi14112101] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/05/2023] [Revised: 10/31/2023] [Accepted: 11/10/2023] [Indexed: 11/26/2023]
Abstract
Molecular diagnostics have become indispensable in healthcare, agriculture, and environmental monitoring. This diagnostic form can offer rapid and precise identification of pathogens and biomarkers. However, traditional laboratory-based molecular testing methods can be expensive and require specialised training, limiting their accessibility in resource-limited settings and on-site applications. To overcome these challenges, this study proposes an innovative approach to reducing costs and complexity in portable colorimetric loop-mediated isothermal amplification (LAMP) devices. The research evaluates different resistive heating systems to create an energy-efficient, cost-effective, and compact device to heat a polydimethylsiloxane (PDMS) block for precise temperature control during LAMP reactions. By combining this novel heating system with an off-the-shelf red-green-blue (RGB) sensor to detect and quantify colour changes, the integrated system can accurately detect Leifsonia xyli subsp. xyli, the bacteria responsible for ratoon stunting disease (RSD) in sugarcane. The experimental validation of this system demonstrates its ability to detect the target pathogen in real time, making it an important development for low cost, portable, and easy-to-use molecular diagnostics in healthcare, agriculture, and environmental monitoring applications.
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Affiliation(s)
- Simon Strachan
- School of Environment and Science, Griffith University, Nathan Campus, Brisbane, QLD 4111, Australia; (M.C.); (M.S.); (R.F.)
- Queensland Micro- and Nanotechnology Centre (QMNC), Griffith University, Nathan Campus, Brisbane, QLD 4111, Australia; (S.A.B.); (N.-T.N.)
| | - Moutoshi Chakraborty
- School of Environment and Science, Griffith University, Nathan Campus, Brisbane, QLD 4111, Australia; (M.C.); (M.S.); (R.F.)
- Centre for Planetary Health and Food Security, Griffith University, Nathan Campus, Brisbane, QLD 4111, Australia
| | - Mohamed Sallam
- School of Environment and Science, Griffith University, Nathan Campus, Brisbane, QLD 4111, Australia; (M.C.); (M.S.); (R.F.)
- Queensland Micro- and Nanotechnology Centre (QMNC), Griffith University, Nathan Campus, Brisbane, QLD 4111, Australia; (S.A.B.); (N.-T.N.)
- Griffith Institute for Drug Discovery, Griffith University, Nathan Campus, Brisbane, QLD 4111, Australia
| | - Shamsul A. Bhuiyan
- Queensland Micro- and Nanotechnology Centre (QMNC), Griffith University, Nathan Campus, Brisbane, QLD 4111, Australia; (S.A.B.); (N.-T.N.)
- Sugar Research Australia, Woodford, QLD 4514, Australia
| | - Rebecca Ford
- School of Environment and Science, Griffith University, Nathan Campus, Brisbane, QLD 4111, Australia; (M.C.); (M.S.); (R.F.)
- Centre for Planetary Health and Food Security, Griffith University, Nathan Campus, Brisbane, QLD 4111, Australia
| | - Nam-Trung Nguyen
- Queensland Micro- and Nanotechnology Centre (QMNC), Griffith University, Nathan Campus, Brisbane, QLD 4111, Australia; (S.A.B.); (N.-T.N.)
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Tarim EA, Oksuz C, Karakuzu B, Appak O, Sayiner AA, Tekin HC. Electromechanical RT-LAMP device for portable SARS-CoV-2 detection. Talanta 2023; 254:124190. [PMID: 36521325 PMCID: PMC9733968 DOI: 10.1016/j.talanta.2022.124190] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2022] [Revised: 12/06/2022] [Accepted: 12/08/2022] [Indexed: 12/14/2022]
Abstract
Rapid point-of-care tests for infectious diseases are essential, especially in pandemic conditions. We have developed a point-of-care electromechanical device to detect SARS-CoV-2 viral RNA using the reverse-transcription loop-mediated isothermal amplification (RT-LAMP) principle. The developed device can detect SARS-CoV-2 viral RNA down to 103 copies/mL and from a low amount of sample volumes (2 μL) in less than an hour of standalone operation without the need for professional labor and equipment. Integrated Peltier elements in the device keep the sample at a constant temperature, and an integrated camera allows automated monitoring of LAMP reaction in a stirring sample by using colorimetric analysis of unfocused sample images in the hue/saturation/value color space. This palm-fitting, portable and low-cost device does not require a fully focused sample image for analysis, and the operation could be stopped automatically through image analysis when the positive test results are obtained. Hence, viral infections can be detected with the portable device produced without the need for long, expensive, and labor-intensive tests and equipment, which can make the viral tests disseminated at the point-of-care.
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Affiliation(s)
- E. Alperay Tarim
- Department of Bioengineering, Izmir Institute of Technology, Izmir 35430, Turkey
| | - Cemre Oksuz
- Department of Bioengineering, Izmir Institute of Technology, Izmir 35430, Turkey
| | - Betul Karakuzu
- Department of Bioengineering, Izmir Institute of Technology, Izmir 35430, Turkey
| | - Ozgur Appak
- Department of Medical Microbiology, Dokuz Eylul University, Faculty of Medicine, Izmir 35330, Turkey
| | - Ayca Arzu Sayiner
- Department of Medical Microbiology, Dokuz Eylul University, Faculty of Medicine, Izmir 35330, Turkey
| | - H. Cumhur Tekin
- Department of Bioengineering, Izmir Institute of Technology, Izmir 35430, Turkey,METU MEMS Center, Ankara 06520, Turkey,Corresponding author. Department of Bioengineering, Izmir Institute of Technology, Izmir 35430, Turkey
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Hong-min Z, Jian Y, Ying L, Yuan Y, Cui-ping W, Yu-cheng D, Jia-jia C. Rapid detection of Heterobasidion annosum using a loop-mediated isothermal amplification assay. Front Cell Infect Microbiol 2023; 13:1134921. [PMID: 37187469 PMCID: PMC10175688 DOI: 10.3389/fcimb.2023.1134921] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2022] [Accepted: 04/11/2023] [Indexed: 05/17/2023] Open
Abstract
Heterobasidion annosum is one of the most aggressive pathogens of Pinus forests in Europe, causing considerable economic losses. To detect H. annosum for disease diagnosis and control, we developed a loop-mediated isothermal amplification (LAMP) reaction with a primer set designed from the glyceraldehyde 3-phosphate dehydrogenase (GAPDH) DNA sequences of H. annosum. In our study, this LAMP assay was found to be capable of efficiently amplifying the target gene within 60 min at 63°C. In specificity tests, H. annosum was positively detected, and other species were negative. The detection limit of this assay was found to be 100 pg·μL-1, and the assay was also successfully tested for use with basidiospore suspensions and wood samples. This study provides a rapid method for diagnosing root and butt rot caused by H. annosum, which will be of use in port surveillance of logs imported from Europe.
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Affiliation(s)
- Zhou Hong-min
- Institute of Microbiology, School of Ecology and Nature Conservation, Beijing Forestry University, Beijing, China
- College of Landscape Architecture, Jiangsu Vocational College of Agriculture and Forestry, Zhenjiang, China
| | - Yu Jian
- College of Landscape Architecture, Jiangsu Vocational College of Agriculture and Forestry, Zhenjiang, China
| | - Liu Ying
- College of Landscape Architecture, Jiangsu Vocational College of Agriculture and Forestry, Zhenjiang, China
| | - Yuan Yuan
- Institute of Microbiology, School of Ecology and Nature Conservation, Beijing Forestry University, Beijing, China
| | - Wu Cui-ping
- Animal, Plant and Food Inspection Center, Nanjing Customs, Nanjing, China
| | - Dai Yu-cheng
- Institute of Microbiology, School of Ecology and Nature Conservation, Beijing Forestry University, Beijing, China
- *Correspondence: Dai Yu-cheng, ; Chen Jia-jia,
| | - Chen Jia-jia
- College of Landscape Architecture, Jiangsu Vocational College of Agriculture and Forestry, Zhenjiang, China
- *Correspondence: Dai Yu-cheng, ; Chen Jia-jia,
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Yu H, Zhang H, Li J, Zhao Z, Deng M, Ren Z, Li Z, Xue C, Li MG, Chen Z. Rapid and Unamplified Detection of SARS-CoV-2 RNA via CRISPR-Cas13a-Modified Solution-Gated Graphene Transistors. ACS Sens 2022; 7:3923-3932. [PMID: 36472865 PMCID: PMC9745736 DOI: 10.1021/acssensors.2c01990] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2022] [Accepted: 11/22/2022] [Indexed: 12/12/2022]
Abstract
The disease caused by severe acute respiratory syndrome coronavirus, SARS-CoV-2, is termed COVID-19. Even though COVID-19 has been out for more than two years, it is still causing a global pandemic. Due to the limitations of sample collection, transportation, and kit performance, the traditional reverse transcription-quantitative polymerase chain reaction (RT-qPCR) method has a long detection period and high testing costs. An increased risk of infection is inevitable, since many patients may not be diagnosed in time. The CRISPR-Cas13a system can be designed for RNA identification and knockdown, as a promising platform for nucleic acid detection. Here, we designed a solution-gated graphene transistor (SGGT) biosensor based on the CRISPR-Cas13a system. Using the gene-targeting capacity of CRISPR-Cas13a and gate functionalization via multilayer modification, SARS-CoV-2 nucleic acid sequences can be quickly and precisely identified without the need for amplification or fluorescence tagging. The limit of detection (LOD) in both buffer and serum reached the aM level, and the reaction time was about 10 min. The results of the detection of COVID-19 clinical samples from throat swabs agree with RT-PCR. In addition, the interchangeable gates significantly minimize the cost and time of device fabrication. In a nutshell, our biosensor technology is broadly applicable and will be suitable for point-of-care (POC) testing.
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Affiliation(s)
- Haiyang Yu
- State Key Laboratory of Advanced Technology for
Materials Synthesis and Processing, Wuhan University of
Technology, Wuhan430070, China
- Collaborative Innovation Center for Advanced Organic
Chemical Materials Co-constructed by the Province and Ministry, Key Laboratory for the
Green Preparation and Application of Functional Materials, Ministry of Education, Hubei
Key Laboratory of Polymer Materials, School of Materials Science and Engineering,
Hubei University, Wuhan430062, China
| | - Huibin Zhang
- Collaborative Innovation Center for Advanced Organic
Chemical Materials Co-constructed by the Province and Ministry, Key Laboratory for the
Green Preparation and Application of Functional Materials, Ministry of Education, Hubei
Key Laboratory of Polymer Materials, School of Materials Science and Engineering,
Hubei University, Wuhan430062, China
| | - Jinhua Li
- Collaborative Innovation Center for Advanced Organic
Chemical Materials Co-constructed by the Province and Ministry, Key Laboratory for the
Green Preparation and Application of Functional Materials, Ministry of Education, Hubei
Key Laboratory of Polymer Materials, School of Materials Science and Engineering,
Hubei University, Wuhan430062, China
| | - Zheng Zhao
- State Key Laboratory of Advanced Technology for
Materials Synthesis and Processing, Wuhan University of
Technology, Wuhan430070, China
- Sanya Science and Education Innovation Park
of Wuhan University of Technology, Sanya572000,
China
| | - Minhua Deng
- Collaborative Innovation Center for Advanced Organic
Chemical Materials Co-constructed by the Province and Ministry, Key Laboratory for the
Green Preparation and Application of Functional Materials, Ministry of Education, Hubei
Key Laboratory of Polymer Materials, School of Materials Science and Engineering,
Hubei University, Wuhan430062, China
| | - Zhanpeng Ren
- Collaborative Innovation Center for Advanced Organic
Chemical Materials Co-constructed by the Province and Ministry, Key Laboratory for the
Green Preparation and Application of Functional Materials, Ministry of Education, Hubei
Key Laboratory of Polymer Materials, School of Materials Science and Engineering,
Hubei University, Wuhan430062, China
| | - Ziqin Li
- Collaborative Innovation Center for Advanced Organic
Chemical Materials Co-constructed by the Province and Ministry, Key Laboratory for the
Green Preparation and Application of Functional Materials, Ministry of Education, Hubei
Key Laboratory of Polymer Materials, School of Materials Science and Engineering,
Hubei University, Wuhan430062, China
| | - Chenglong Xue
- Collaborative Innovation Center for Advanced Organic
Chemical Materials Co-constructed by the Province and Ministry, Key Laboratory for the
Green Preparation and Application of Functional Materials, Ministry of Education, Hubei
Key Laboratory of Polymer Materials, School of Materials Science and Engineering,
Hubei University, Wuhan430062, China
| | - Mitch Guijun Li
- Division of Integrative Systems and Design,
The Hong Kong University of Science and Technology, Clear
Water Bay, Kowloon, Hong Kong SAR999077, China
| | - Zhaowei Chen
- Division of Nephrology, Renmin Hospital
of Wuhan University, Wuhan430060, China
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