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Zhang L, Zhou Q, Liu J, Liu M, Hu J, Bao Z, Wang M. Development of recombinase amplification assays for the rapid detection of infectious myonecrosis virus. J Invertebr Pathol 2024; 205:108143. [PMID: 38810834 DOI: 10.1016/j.jip.2024.108143] [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: 12/11/2023] [Revised: 05/01/2024] [Accepted: 05/26/2024] [Indexed: 05/31/2024]
Abstract
Infectious myonecrosis virus (IMNV) has affected shrimp farming in many countries, such as northeastern Brazil and southeast Asia, and poses a serious threat to the global shrimp industry. Reverse transcription enzymatic recombinant amplification technology (RT-ERA) is a rapid DNA amplification assay with high specificity in isothermal conditions and has been widely applied to the pathogen's detection. In this study, two novel ERA assays of IMNV, real-time RT-ERA and an RT-ERA combined with lateral flow dipsticks assay (RT-ERA-LFD), were developed and evaluated. The real-time RT-ERA assay could be carried out at 38-42 °C and had the highest end-point fluorescence value and the smallest Ct value at 41 °C. The brightness and width of the detection line were at a maximum at 39 °C and 30 min, and these conditions were selected in RT-ERA-LFD. Both real-time RT-ERA and RT-ERA-LFD produced positive results with IMNV standard plasmids only and showed no cross-reaction with Vibrio parahaemolyticus, which causes acute hepatopancreatic necrosis disease (VpAHPND); white spot syndrome virus (WSSV); infectious hypodermal and hematopoietic necrosis virus (IHHNV); or Ecytonucleospora hepatopenaei (EHP). Meanwhile, we compared the sensitivities of nested RT-PCR, real-time RT-PCR, real-time RT-ERA, and RT-ERA-LFD. The sensitivities of real-time RT-ERA and RT-ERA-LFD were both 101 copies/μL. The detection sensitivities of nested RT-PCR and real-time RT-PCR were 100 and 102 copies/μL, respectively. As a result, two ERA assays were determined to be specific, sensitive, and economical methods for the on-site diagnosis of IMNV infection, showing great potential for the control of IMNV infections.
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Affiliation(s)
- Lu Zhang
- Key Laboratory of Tropical Aquatic Germplasm of Hainan province, Sanya Oceanographic Institution, Ocean University of China, Sanya 572024, China; MOE Key Laboratory of Marine Genetics and Breeding, Ocean University of China, Qingdao 266003, China
| | - Qingqian Zhou
- Key Laboratory of Tropical Aquatic Germplasm of Hainan province, Sanya Oceanographic Institution, Ocean University of China, Sanya 572024, China; MOE Key Laboratory of Marine Genetics and Breeding, Ocean University of China, Qingdao 266003, China
| | - Junjiang Liu
- Key Laboratory of Tropical Aquatic Germplasm of Hainan province, Sanya Oceanographic Institution, Ocean University of China, Sanya 572024, China; MOE Key Laboratory of Marine Genetics and Breeding, Ocean University of China, Qingdao 266003, China
| | - Mengran Liu
- Key Laboratory of Tropical Aquatic Germplasm of Hainan province, Sanya Oceanographic Institution, Ocean University of China, Sanya 572024, China; MOE Key Laboratory of Marine Genetics and Breeding, Ocean University of China, Qingdao 266003, China.
| | - Jingjie Hu
- Key Laboratory of Tropical Aquatic Germplasm of Hainan province, Sanya Oceanographic Institution, Ocean University of China, Sanya 572024, China; MOE Key Laboratory of Marine Genetics and Breeding, Ocean University of China, Qingdao 266003, China; Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou 511458, China
| | - Zhenmin Bao
- Key Laboratory of Tropical Aquatic Germplasm of Hainan province, Sanya Oceanographic Institution, Ocean University of China, Sanya 572024, China; MOE Key Laboratory of Marine Genetics and Breeding, Ocean University of China, Qingdao 266003, China; Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou 511458, China
| | - Mengqiang Wang
- Key Laboratory of Tropical Aquatic Germplasm of Hainan province, Sanya Oceanographic Institution, Ocean University of China, Sanya 572024, China; MOE Key Laboratory of Marine Genetics and Breeding, Ocean University of China, Qingdao 266003, China; Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou 511458, China.
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Yu Y, Yang Z, Wang L, Sun F, Lee M, Wen Y, Qin Q, Yue GH. LAMP for the rapid diagnosis of iridovirus in aquaculture. AQUACULTURE AND FISHERIES 2022. [DOI: 10.1016/j.aaf.2021.08.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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Chen Y, Zhang L, Xu L, Guo X, Yang H, Zhuang L, Li Y, Wang Z, Gu B. Rapid and sensitive detection of Shigella flexneri using fluorescent microspheres as label for immunochromatographic test strip. ANNALS OF TRANSLATIONAL MEDICINE 2019; 7:565. [PMID: 31807546 DOI: 10.21037/atm.2019.09.46] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Background Bacillary dysentery caused by Shigella genus is a major cause of morbidity and mortality worldwide. In China, the popular strain was mainly Shigella flexneri (S. flexneri). Therefore, fluorescent microspheres (FMs)-based immunochromatographic test strip (ICTS), as a novel, reliable, sensitive and uncomplicated method, was evaluated to detect S. flexneri. Methods Sixty-three clinical samples of S. flexneri were collected in this paper. Polymerase chain reaction (PCR) combined with FMs-ICTS based on magnetic purification assay was developed for the quantitative detection of Shigella. And the genus-specific gene of ipaH and drug resistant gene of CTX-M-9 from Shigella were selected to investigate the potential of this new method. The sensitivity and specificity of this method were demonstrated by classical microbiological methods (API Coryne System), PCR assay based on agarose gel electrophoresis (PCR-GE) and the real-time fluorescent quantitative PCR (RTFQ-PCR) method. Results Under optimized conditions, the lower detection limits of PCR-ICTS, PCR-GE and RTFQ-PCR were 2.5×10-7, 2.5×10-5 and the 3.2×10-7 ng/µL, respectively. Experiments demonstrated the PCR-ICTS has a diagnostic agreement of 100% with conventional PCR and RTFQ-PCR on detection of clinical samples and could correctly recognize Shigella and non-Shigella from different microbial samples. After the purification of PCR products with Silicon coated magnetic nanoparticles (Si-MNPs), the false positive results were removed because of the strong screening ability of the purification process. Our results showed that FM-based ICTS was promising for measurable and sensitive detection of S. flexneri within 3 h. Conclusions The results from immunochromatographic test were agreement with those from API Coryne system and RTFQ-PCR. Hence, this developed method might be useful for screening and monitoring clinical sample of S. flexneri, due to its speed, non-poisonous, simplicity and low-cost and helpful for promoting the prevention and control of communicable diseases caused by enteric pathogens such as S. flexneri.
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Affiliation(s)
- Ying Chen
- School of Medical Technology, Xuzhou Medical University, Xuzhou 221004, China
| | - Linyan Zhang
- School of Medical Technology, Xuzhou Medical University, Xuzhou 221004, China
| | - Ling Xu
- School of Medical Technology, Xuzhou Medical University, Xuzhou 221004, China
| | - Xinjian Guo
- School of Medical Technology, Xuzhou Medical University, Xuzhou 221004, China
| | - Huan Yang
- School of Medical Technology, Xuzhou Medical University, Xuzhou 221004, China
| | - Linlin Zhuang
- School of Biological Science and Medical Engineering, Southeast University, Nanjing 210096, China.,Nanjing Nanoeast biotech Co., Ltd., Nanjing 210000, China
| | - Ying Li
- School of Medical Technology, Xuzhou Medical University, Xuzhou 221004, China
| | - Zhenzhen Wang
- School of Medical Technology, Xuzhou Medical University, Xuzhou 221004, China
| | - Bing Gu
- School of Medical Technology, Xuzhou Medical University, Xuzhou 221004, China
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Loop-mediated isothermal amplification (LAMP) assays for detection and identification of aquaculture pathogens: current state and perspectives. Appl Microbiol Biotechnol 2014; 98:2881-95. [DOI: 10.1007/s00253-014-5531-z] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2013] [Revised: 01/08/2014] [Accepted: 01/09/2014] [Indexed: 11/26/2022]
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Zhang S, Xue M, Zhang J, Chen Q, Chen J, Wang Z, Zhou W, Chen P, Xia N, Ge S. A one-step dipstick assay for the on-site detection of nucleic acid. Clin Biochem 2013; 46:1852-6. [PMID: 24161476 DOI: 10.1016/j.clinbiochem.2013.10.013] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2013] [Revised: 10/12/2013] [Accepted: 10/15/2013] [Indexed: 11/18/2022]
Abstract
OBJECTIVES We have developed a one-step nucleic acid dipstick assay (NADA) for visually detecting polymerase chain reaction (PCR) products within 3min. "One-step" means that there were no additional procedures between amplification and detection. METHODS This method was achieved through the use of asymmetric PCR and specially designed probes with appropriate melting temperature values. We initially combined one-step NADA with asymmetric capillary convective PCR (ACCPCR), an easy and rapid nucleic acid amplification technique, to construct an on-site nucleic acid diagnostic platform. RESULTS We developed a diagnostic assay for the hepatitis B virus based on the ACCPCR-NADA platform to verify its feasibility. It exhibited an analytical sensitivity of three copies per test and a broad detection spectrum including genotype A-I. It also showed 97.9% sensitivity and 100% specificity based on the results observed using 67 serum samples with the Roche COBAS AmpliPrep/COBAS TaqMan (COBAS) system as the standard for comparison. CONCLUSION The results provide evidence for the feasibility of using an ACCPCR-NADA platform in practical applications, especially in on-site test.
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Affiliation(s)
- Shiyin Zhang
- National Institute of Diagnostics and Vaccine Development in Infectious Disease, School of Life Science, Xiamen University, Xiamen, China
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Arunrut N, Kampeera J, Suebsing R, Kiatpathomchai W. Rapid and sensitive detection of shrimp infectious myonecrosis virus using a reverse transcription loop-mediated isothermal amplification and visual colorogenic nanogold hybridization probe assay. J Virol Methods 2013; 193:542-7. [PMID: 23876366 DOI: 10.1016/j.jviromet.2013.07.017] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2013] [Revised: 07/01/2013] [Accepted: 07/10/2013] [Indexed: 10/26/2022]
Abstract
This study reports a novel strategy for the detection of reverse transcription loop-mediated isothermal amplification (RT-LAMP) products derived from infectious myonecrosis virus (IMNV), causes a serious myonecrosis in Penaeus (Litopenaeus) vannamei, by using a ssDNA-labeled with gold nanoparticle (AuNP) probe. This technique relies on a self-aggregation method, when the AuNP aggregation is induced by an increasing of salt concentrations with visual detection. The presence of IMNV-LAMP target prevented an AuNP aggregation and a solution remained as pink color of AuNP, while non-complementary targets cannot prevent AuNP aggregation, resulting in a visible color change to purple color after addition of salt. By using the combination of LAMP and AuNP probe system, the total assay interval required approximately 50 min (exclude RNA preparation). Detection limit was 10 copies of IMNV RNA in vitro transcript that comparable to that of LAMP followed by LFD and nested RT-PCR, but it was 100-times more sensitive than RT-PCR methods. This assay can be adapted easily for rapid detection of other shrimp infectious diseases agents at low-cost with robust reagents and using a simple colorimetric detection method.
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Affiliation(s)
- Narong Arunrut
- Center of Excellence for Shrimp Molecular Biology and Biotechnology (CENTEX Shrimp), Faculty of Science, Mahidol University, Rama VI Road, Bangkok 10400, Thailand; National Center for Genetic Engineering and Biotechnology (BIOTEC), National Science and Technology Development Agency, Pathumthani 12120, Thailand
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Loy JD, Loy DS, Mogler MA, Janke B, Kamrud K, Harris DLH, Bartholomay LC. Sequence-optimized and targeted double-stranded RNA as a therapeutic antiviral treatment against infectious myonecrosis virus in Litopenaeus vannamei. DISEASES OF AQUATIC ORGANISMS 2013; 105:57-64. [PMID: 23836770 DOI: 10.3354/dao02600] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Infectious myonecrosis virus (IMNV) is a significant and emerging pathogen that has a tremendous impact on the culture of the Pacific white shrimp Litopenaeus vannamei. IMNV first emerged in Brazil in 2002 and subsequently spread to Indonesia, causing large economic losses in both countries. No existing therapeutic treatments or effective interventions currently exist for IMNV. RNA interference (RNAi) is an effective technique for preventing viral disease in shrimp. Here, we describe the efficacy of a double-stranded RNA (dsRNA) applied as an antiviral therapeutic following virus challenge. The antiviral molecule is an optimized dsRNA construct that targets an IMNV sequence at the 5' end of the genome and that showed outstanding antiviral protection previously when administered prior to infection. At least 50% survival is observed with a low dose of dsRNA administered 48 h post-infection with a lethal dose of IMNV; this degree of protection was not observed when dsRNA was administered 72 h post-infection. Additionally, administration of the dsRNA antiviral resulted in a significant reduction of the viral load in the muscle of shrimp that died from disease or survived until termination of the present study, as assessed by quantitative RT-PCR. These data indicate that this optimized RNAi antiviral molecule holds promise for use as an antiviral therapeutic against IMNV.
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Affiliation(s)
- J Dustin Loy
- Department of Animal Sciences, Iowa State University, Ames, Iowa 50011, USA
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LaBarre P, Hawkins KR, Gerlach J, Wilmoth J, Beddoe A, Singleton J, Boyle D, Weigl B. A simple, inexpensive device for nucleic acid amplification without electricity-toward instrument-free molecular diagnostics in low-resource settings. PLoS One 2011; 6:e19738. [PMID: 21573065 PMCID: PMC3090398 DOI: 10.1371/journal.pone.0019738] [Citation(s) in RCA: 100] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2010] [Accepted: 04/14/2011] [Indexed: 12/20/2022] Open
Abstract
BACKGROUND Molecular assays targeted to nucleic acid (NA) markers are becoming increasingly important to medical diagnostics. However, these are typically confined to wealthy, developed countries; or, to the national reference laboratories of developing-world countries. There are many infectious diseases that are endemic in low-resource settings (LRS) where the lack of simple, instrument-free, NA diagnostic tests is a critical barrier to timely treatment. One of the primary barriers to the practicality and availability of NA assays in LRS has been the complexity and power requirements of polymerase chain reaction (PCR) instrumentation (another is sample preparation). METHODOLOGY/PRINCIPAL FINDINGS In this article, we investigate the hypothesis that an electricity-free heater based on exothermic chemical reactions and engineered phase change materials can successfully incubate isothermal NA amplification assays. We assess the heater's equivalence to commercially available PCR instruments through the characterization of the temperature profiles produced, and a minimal method comparison. Versions of the prototype for several different isothermal techniques are presented. CONCLUSIONS/SIGNIFICANCE We demonstrate that an electricity-free heater based on exothermic chemical reactions and engineered phase change materials can successfully incubate isothermal NA amplification assays, and that the results of those assays are not significantly different from ones incubated in parallel in commercially available PCR instruments. These results clearly suggest the potential of the non-instrumented nucleic acid amplification (NINA) heater for molecular diagnostics in LRS. When combined with other innovations in development that eliminate power requirements for sample preparation, cold reagent storage, and readout, the NINA heater will comprise part of a kit that should enable electricity-free NA testing for many important analytes.
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Affiliation(s)
- Paul LaBarre
- PATH, Seattle, Washington, United States of America.
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Blažková M, Javůrková B, Fukal L, Rauch P. Immunochromatographic strip test for detection of genus Cronobacter. Biosens Bioelectron 2010; 26:2828-34. [PMID: 21169009 DOI: 10.1016/j.bios.2010.10.001] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2010] [Revised: 09/17/2010] [Accepted: 10/02/2010] [Indexed: 12/11/2022]
Abstract
Members of the genus Cronobacter are opportunistic pathogens formerly known as Enterobacter sakazakii, which induce severe meningitis and sepsis in neonates and infants, with a high fatality rate. In this work, a simple and rapid immunochromatographic strip test for the detection of this pathogen was developed. Following the shortened bacteria cultivation and isolation of DNA, a specific gene sequence targeting 16S rRNA from Cronobacter spp. was amplified by PCR using 5'-end labelled specific primers. The PCR product, amplicon labelled with digoxigenin on one side and biotin on the other side, was directly added to the immunochromatographic strip test, composed of nitrocellulose membrane with bound antibody against digoxigenin in the test line. The visualization was mediated by colloidal carbon conjugated to neutravidin, and the appearance of grey/black line was indicative of the presence of specific amplicon. Colour intensity of the test line in pathogen-positive assay was visually distinguishable from that of negative sample within 10 min. The visual detection limit of PCR product was 8 ng. The specificity of the developed method was confirmed by standard microbiological techniques. Whole detection procedure with the incorporated immunostrip was applied to analysis of infant formulae samples, contaminated with less than 10 cells of Cronobacter spp. per 10 g. The results from immunochromatographic test indicated the absolute agreement with those from standard microbiological methods. Moreover, the developed procedure considerably reduced the total analysis time to 16 h whereas the reference microbiological method needs 6-7 days.
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Affiliation(s)
- Martina Blažková
- Department of Biochemistry and Microbiology, Institute of Chemical Technology, Technická 3, 166 28 Prague, Czech Republic
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Seibert CH, Borsa M, Rosa RD, Cargnin-Ferreira E, Pereira AML, Grisard EC, Zanetti CR, Pinto AR. Detection of major capsid protein of infectious myonecrosis virus in shrimps using monoclonal antibodies. J Virol Methods 2010; 169:169-75. [PMID: 20678523 DOI: 10.1016/j.jviromet.2010.07.020] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2010] [Revised: 07/16/2010] [Accepted: 07/22/2010] [Indexed: 12/12/2022]
Abstract
Infectious myonecrosis virus (IMNV) has been causing a progressive disease in farm-reared shrimps in Brazil and Indonesia. Immunodiagnostic methods for IMNV detection, although reliable, are not employed currently because monoclonal antibodies (MAbs) against this virus are not available. In this study, a fragment of the IMNV major capsid protein gene, comprising amino acids 300-527 (IMNV(300-527)), was cloned and expressed in Escherichia coli. The nucleotide sequence of the recombinant IMNV(300-527) fragment displayed a high degree of identity to the major capsid protein of IMNV isolates from Brazil (99%) and Indonesia (98%). Ten MAbs were generated against the expressed fragment, and eight of these, mostly IgG(2a) or IgG(2b), were able to bind to IMNV in tissue extracts from shrimps infected naturally in immunodot-blot assays. Six of these MAbs recognized a approximately 100 kDa protein in a Western-blot, which is the predicted mass of IMNV major capsid protein, and also bound to viral inclusions present in muscle fibroses and in coagulative myonecrosis, as demonstrated by immunohistochemistry. Among all those MAbs created, four did not cross-react with non-infected shrimp tissues; this observation supports their applicability as a sensitive and specific immunodiagnosis of IMNV infection in shrimps.
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Affiliation(s)
- Caroline H Seibert
- Departamento de Microbiologia, Imunologia e Parasitologia, Universidade Federal de Santa Catarina, 88040-970, Florianópolis, SC, Brazil
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Rigano LA, Marano MR, Castagnaro AP, Do Amaral AM, Vojnov AA. Rapid and sensitive detection of Citrus Bacterial Canker by loop-mediated isothermal amplification combined with simple visual evaluation methods. BMC Microbiol 2010; 10:176. [PMID: 20565886 PMCID: PMC2895605 DOI: 10.1186/1471-2180-10-176] [Citation(s) in RCA: 69] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2009] [Accepted: 06/18/2010] [Indexed: 11/13/2022] Open
Abstract
Background Citrus Bacterial Canker (CBC) is a major, highly contagious disease of citrus plants present in many countries in Asia, Africa and America, but not in the Mediterranean area. There are three types of Citrus Bacterial Canker, named A, B, and C that have different genotypes and posses variation in host range within citrus species. The causative agent for type A CBC is Xanthomonas citri subsp. citri, while Xanthomonas fuscans subsp. aurantifolii, strain B causes type B CBC and Xanthomonas fuscans subsp. aurantifolii strain C causes CBC type C. The early and accurate identification of those bacteria is essential for the protection of the citrus industry. Detection methods based on bacterial isolation, antibodies or polymerase chain reaction (PCR) have been developed previously; however, these approaches may be time consuming, laborious and, in the case of PCR, it requires expensive laboratory equipment. Loop-mediated isothermal amplification (LAMP), which is a novel isothermal DNA amplification technique, is sensitive, specific, fast and requires no specialized laboratory equipment. Results A loop-mediated isothermal amplification assay for the diagnosis of Citrus Bacterial Canker (CBC-LAMP) was developed and evaluated. DNA samples were obtained from infected plants or cultured bacteria. A typical ladder-like pattern on gel electrophoresis was observed in all positive samples in contrast to the negative controls. In addition, amplification products were detected by visual inspection using SYBRGreen and using a lateral flow dipstick, eliminating the need for gel electrophoresis. The sensitivity and specificity of the assay were evaluated in different conditions and using several sample sources which included purified DNA, bacterium culture and infected plant tissue. The sensitivity of the CBC-LAMP was 10 fg of pure Xcc DNA, 5 CFU in culture samples and 18 CFU in samples of infected plant tissue. No cross reaction was observed with DNA of other phytopathogenic bacteria. The assay was capable of detecting CBC-causing strains from several geographical origins and pathotypes. Conclusions The CBC-LAMP technique is a simple, fast, sensitive and specific method for the diagnosis of Citrus Bacterial Canker. This method can be useful in the phytosanitary programs of the citrus industry worldwide.
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Affiliation(s)
- Luciano A Rigano
- Instituto de Ciencia y Tecnología Dr. Cesar Milstein, Fundación Pablo Cassará, Consejo Nacional de Investigaciones Científicas y Técnicas, Saladillo, Ciudad de Buenos Aires, Argentina
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