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Tan L, Li J, Duan Y, Liu J, Zheng S, Liang X, Fang C, Zuo M, Tian G, Yang Y. Current knowledge on the epidemiology and prevention of Avian leukosis virus in China. Poult Sci 2024; 103:104009. [PMID: 39002365 PMCID: PMC11298916 DOI: 10.1016/j.psj.2024.104009] [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: 04/23/2024] [Revised: 05/26/2024] [Accepted: 06/19/2024] [Indexed: 07/15/2024] Open
Abstract
Avian leukosis virus (ALV) is an enveloped retrovirus with a single-stranded RNA genome, belonging to the genus Alpharetrovirus within the family Retroviridae. The disease (Avian leukosis, AL) caused by ALV is mainly characterized by tumor development and immunosuppression in chickens, which increases susceptibility to other pathogens and leads to significant economic losses in the Chinese poultry industry. The government and poultry industry have made lots of efforts to eradicate ALV, but the threat of which remains not vanished. This review provides a summary of the updated understanding of ALV in China, which mainly focuses on genetic and molecular biology, epidemiology, and diagnostic methods. Additionally, promising antiviral agents and ALV eradication strategies performed in China are also included.
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Affiliation(s)
- Lei Tan
- College of Animal Science and Technology, Yangtze University, Jingzhou, China; Yunnan Sino-Science Gene Technology Co. Ltd. Kunming, Yunnan, China
| | - Juan Li
- Yunnan Sino-Science Gene Technology Co. Ltd. Kunming, Yunnan, China; Hunan Provincial Key Laboratory of the TCM Agricultural Biogenomics, Changsha Medical University, Changsha, Hunan, China
| | - Yuqing Duan
- College of Animal Science and Technology, Yangtze University, Jingzhou, China
| | - Jing Liu
- College of Animal Science and Technology, Yangtze University, Jingzhou, China
| | - Shiling Zheng
- College of Animal Science and Technology, Yangtze University, Jingzhou, China
| | - Xiongyan Liang
- College of Animal Science and Technology, Yangtze University, Jingzhou, China
| | - Chun Fang
- College of Animal Science and Technology, Yangtze University, Jingzhou, China
| | - Mengting Zuo
- Hunan Provincial Key Laboratory of the TCM Agricultural Biogenomics, Changsha Medical University, Changsha, Hunan, China
| | - Guangming Tian
- College of Animal Science and Technology, Yangtze University, Jingzhou, China.
| | - Yuying Yang
- College of Animal Science and Technology, Yangtze University, Jingzhou, China.
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Li J, Zhang Z, Zhang Z, Chen X, Wang C, Zhai X, Zhang T. Rapid detection of avian leukemia virus using CRISPR/Cas13a based lateral flow dipstick. Front Vet Sci 2024; 11:1424238. [PMID: 39220765 PMCID: PMC11362082 DOI: 10.3389/fvets.2024.1424238] [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: 04/27/2024] [Accepted: 08/06/2024] [Indexed: 09/04/2024] Open
Abstract
Avian leukemia virus (ALV) is one of the main pathogens of poultry tumor diseases, and has caused significant economic losses to the poultry industry since its discovery. Therefore, establishing a rapid detection method is essential to effectively prevent and control the spread of ALV. In this study, specific CRISPR RNA (crRNA) and recombinase-aided amplification (RAA) primers with T7 promoter were designed based on the relatively conserved sequence of avian leukemia virus. When crRNA recognized the target sequence, Cas13a protein was activated to cut the reporting probes, and then the detection results were read by using lateral flow dipstick (LFD). The RAA-CRISPR/Cas13a-LFD reaction system was constructed. The RAA amplification time, Cas13a protein concentration, crRNA concentration and CRISPR reaction time were optimized to evaluate the specificity, sensitivity and reproducibility of the system. Finally, RAA-CRISPR/Cas13a-LFD method was compared with Polymerase chain reaction (PCR)-Agarose electrophoresis method and qPCR method in the detection of clinical samples, and the reliability of RAA-CRISPR/Cas13a-LFD method was evaluated. The results showed that the RAA-CRISPR/Cas13a-LFD method could effectively amplify the target gene at 37°C for 40 min, and the test results could be determined by LFD visual observation. The method had good specificity and no cross-reaction with Marek's disease virus (MDV), Fowl adenovirus (FAdV), Infectious bursal disease virus (IBDV), Newcastle disease virus (NDV), Infectious laryngotracheitis virus (ILTV), and Infectious bronchitis virus (IBV). The minimum detection limit of the method was 100 copies/μL, and it had good repeatability and stability. The coincidence rate of clinical detection reached 97.69% and 99.23%. In summary, this study established a simple, efficient, accurate and visualized ALV detection method, which can be used for the prevention and rapid clinical diagnosis of avian leukosis (AL).
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Affiliation(s)
- Jing Li
- College of Veterinary Medicine, Hebei Agricultural University, Baoding, China
| | - Zichuang Zhang
- Institute of Special Animal and Plant Sciences, Chinese Academy of Agricultural Sciences, Changchun, China
| | - Zongshu Zhang
- College of Veterinary Medicine, Hebei Agricultural University, Baoding, China
| | - Xi Chen
- College of Veterinary Medicine, Hebei Agricultural University, Baoding, China
| | - Chunguang Wang
- College of Veterinary Medicine, Hebei Agricultural University, Baoding, China
| | - Xianghe Zhai
- College of Veterinary Medicine, Hebei Agricultural University, Baoding, China
| | - Tie Zhang
- College of Veterinary Medicine, Hebei Agricultural University, Baoding, China
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Xu Q, Zhang Y, Sadigh Y, Tang N, Chai J, Cheng Z, Gao Y, Qin A, Shen Z, Yao Y, Nair V. Specific and Sensitive Visual Proviral DNA Detection of Major Pathogenic Avian Leukosis Virus Subgroups Using CRISPR-Associated Nuclease Cas13a. Viruses 2024; 16:1168. [PMID: 39066330 PMCID: PMC11281634 DOI: 10.3390/v16071168] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2024] [Revised: 07/04/2024] [Accepted: 07/09/2024] [Indexed: 07/28/2024] Open
Abstract
Avian leukosis viruses (ALVs) include a group of avian retroviruses primarily associated with neoplastic diseases in poultry, commonly referred to as avian leukosis. Belonging to different subgroups based on their envelope properties, ALV subgroups A, B, and J (ALV-A, ALV-B, and ALV-J) are the most widespread in poultry populations. Early identification and removal of virus-shedding birds from infected flocks are essential for the ALVs' eradication. Therefore, the development of rapid, accurate, simple-to-use, and cost effective on-site diagnostic methods for the detection of ALV subgroups is very important. Cas13a, an RNA-guided RNA endonuclease that cleaves target single-stranded RNA, also exhibits non-specific endonuclease activity on any bystander RNA in close proximity. The distinct trans-cleavage activity of Cas13 has been exploited in the molecular diagnosis of multiple pathogens including several viruses. Here, we describe the development and application of a highly sensitive Cas13a-based molecular test for the specific detection of proviral DNA of ALV-A, B, and J subgroups. Prokaryotically expressed LwaCas13a, purified through ion exchange and size-exclusion chromatography, was combined with recombinase polymerase amplification (RPA) and T7 transcription to establish the SHERLOCK (specific high-sensitivity enzymatic reporter unlocking) molecular detection system for the detection of proviral DNA of ALV-A/B/J subgroups. This novel method that needs less sample input with a short turnaround time is based on isothermal detection at 37 °C with a color-based lateral flow readout. The detection limit of the assay for ALV-A/B/J subgroups was 50 copies with no cross reactivity with ALV-C/D/E subgroups and other avian oncogenic viruses such as reticuloendotheliosis virus (REV) and Marek's disease virus (MDV). The development and evaluation of a highly sensitive and specific visual method of detection of ALV-A/B/J nucleic acids using CRISPR-Cas13a described here will help in ALV detection in eradication programs.
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Affiliation(s)
- Qingqing Xu
- The Pirbright Institute and UK-China Centre of Excellence for Research on Avian Diseases, Pirbright, Guildford, Surrey GU24 ONF, UK; (Q.X.); (Y.Z.); (Y.S.)
- UK-China Centre of Excellence for Research on Avian Diseases, Shandong Binzhou Animal Science and Veterinary Medicine Academy, Binzhou 256600, China; (N.T.); (Z.S.)
- Sino-UK Laboratory for Poultry Disease Research, Shandong Binzhou Animal Science and Veterinary Medicine Academy, Binzhou 256600, China
| | - Yaoyao Zhang
- The Pirbright Institute and UK-China Centre of Excellence for Research on Avian Diseases, Pirbright, Guildford, Surrey GU24 ONF, UK; (Q.X.); (Y.Z.); (Y.S.)
| | - Yashar Sadigh
- The Pirbright Institute and UK-China Centre of Excellence for Research on Avian Diseases, Pirbright, Guildford, Surrey GU24 ONF, UK; (Q.X.); (Y.Z.); (Y.S.)
| | - Na Tang
- UK-China Centre of Excellence for Research on Avian Diseases, Shandong Binzhou Animal Science and Veterinary Medicine Academy, Binzhou 256600, China; (N.T.); (Z.S.)
- Sino-UK Laboratory for Poultry Disease Research, Shandong Binzhou Animal Science and Veterinary Medicine Academy, Binzhou 256600, China
| | - Jiaqian Chai
- College of Veterinary Medicine, Shandong Agricultural University, Tai’an 271018, China; (J.C.); (Z.C.)
| | - Ziqiang Cheng
- College of Veterinary Medicine, Shandong Agricultural University, Tai’an 271018, China; (J.C.); (Z.C.)
| | - Yulong Gao
- State Key Laboratory of Veterinary Biotechnology, Division of Avian Infectious Diseases, Harbin Veterinary Research Institute, The Chinese Academy of Agricultural Sciences, Harbin 150008, China;
| | - Aijian Qin
- Ministry of Education Key Lab for Avian Preventive Medicine, Yangzhou University, Yangzhou 225109, China;
| | - Zhiqiang Shen
- UK-China Centre of Excellence for Research on Avian Diseases, Shandong Binzhou Animal Science and Veterinary Medicine Academy, Binzhou 256600, China; (N.T.); (Z.S.)
- Sino-UK Laboratory for Poultry Disease Research, Shandong Binzhou Animal Science and Veterinary Medicine Academy, Binzhou 256600, China
| | - Yongxiu Yao
- The Pirbright Institute and UK-China Centre of Excellence for Research on Avian Diseases, Pirbright, Guildford, Surrey GU24 ONF, UK; (Q.X.); (Y.Z.); (Y.S.)
| | - Venugopal Nair
- The Pirbright Institute and UK-China Centre of Excellence for Research on Avian Diseases, Pirbright, Guildford, Surrey GU24 ONF, UK; (Q.X.); (Y.Z.); (Y.S.)
- The Jenner Institute Laboratories, University of Oxford, Oxford OX3 7DQ, UK
- Department of Biology, University of Oxford, Oxford OX1 3RB, UK
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Xu Z, Ma X, Wang X, Zhang R, Zhang T, Ma M, Shi F, Chen C. Rapid and sensitive visual detection of avian leukosis virus by reverse transcription loop-mediated isothermal amplification combined with a lateral flow immunochromatographic strip assay. Arch Virol 2024; 169:94. [PMID: 38594417 DOI: 10.1007/s00705-024-05977-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2023] [Accepted: 12/15/2023] [Indexed: 04/11/2024]
Abstract
Considering that avian leukosis virus (ALV) infection has inflicted massive economic losses on the poultry breeding industry in most countries, its early diagnosis remains an important measure for timely treatment and control of the disease, for which a rapid and sensitive point-of-care test is required. We established a user-friendly, economical, and rapid visualization method for ALV amplification products based on reverse transcription loop-mediated isothermal amplification (RT-LAMP) combined with an immunochromatographic strip in a lateral flow device (LFD). Using the ALVp27 gene as the target, five RT-LAMP primers and one fluorescein-isothiocyanate-labeled probe were designed. After 60 min of RT-LAMP amplification at 64 °C, the products could be visualized directly using the LFD. The detection limit of this assay for ALV detection was 102 RNA copies/μL, and the sensitivity was 100 times that of reverse transcription polymerase chain reaction (RT-PCR), showing high specificity and sensitivity. To verify the clinical practicality of this assay for detecting ALV, the gold standard RT-PCR method was used for comparison, and consistent results were obtained with both assays. Thus, the assay described here can be used for rapid detection of ALV in resource-limited environments.
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Affiliation(s)
- Zhihua Xu
- College of Life Science, Shihezi University, Shihezi, 832003, China
| | - Xiaoyu Ma
- College of Life Science, Shihezi University, Shihezi, 832003, China
| | - Xuejing Wang
- College of Life Science, Shihezi University, Shihezi, 832003, China
| | - Renyin Zhang
- College of Life Science, Shihezi University, Shihezi, 832003, China
| | - Tieying Zhang
- College of Life Science, Shihezi University, Shihezi, 832003, China
| | - Mingze Ma
- College of Life Science, Shihezi University, Shihezi, 832003, China
| | - Feng Shi
- College of Life Science, Shihezi University, Shihezi, 832003, China.
| | - Chuangfu Chen
- College of Animal Science and Technology, Shihezi University, Shihezi, 832003, Xinjiang, China.
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Wu M, Hu S, Zhu Y, Cong F, Liu S. Simultaneous Detection of Three Subgroups of Avian Leukosis Virus Using the Nanoparticle-Assisted PCR Assay. Viruses 2023; 16:15. [PMID: 38275950 PMCID: PMC10819818 DOI: 10.3390/v16010015] [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: 08/30/2023] [Revised: 10/28/2023] [Accepted: 11/02/2023] [Indexed: 01/27/2024] Open
Abstract
Nanoparticle-assisted polymerase chain reaction (nanoPCR) is a novel method for the rapid detection of pathogens. A sensitive and specific multiple nanoPCR assay was developed for simultaneous detection of avian leucosis virus (ALV) subgroups A, B and J. In this study, three pairs of primers were designed, based on the conserved region of the gp85 gene. An exploration of the optimal primer concentration and annealing temperature were carried out, for better performance of the nanoPCR assay. According to the results, the multiple nanoPCR assay amplified 336 pb, 625 bp and 167 bp fragments of ALV-A, -B and -J, respectively, and showed no cross-reactivity with irrelevant pathogens, suggesting the excellent specificity of the assay. The constructed standard DNA templates were used to estimate the limit of detection. As shown by the results, the detection limit of the nanoPCR assay was nearly 10 copies/μL. To further evaluate the detection ability of the assay, 186 clinical samples were detected using the nanoPCR assay, among which, 14 samples were confirmed as ALV positive; the results were further confirmed by sequencing. In conclusion, a highly specific and sensitive nanoPCR assay was successfully developed, which could be a useful tool for clinical diagnosis as well as for the discrimination of ALV-A, -B and -J.
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Affiliation(s)
- Miaoli Wu
- Division of Avian Infectious Diseases, State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin 150026, China;
- Guangdong Laboratory Animals Monitoring Institute and Guangdong Provincial Key Laboratory of Laboratory Animals, Guangzhou 510633, China;
| | - Shuaiqi Hu
- College of Animal Science, Anhui Science and Technology University and Anhui Province Key Laboratory of Animal Nutritional Regulation and Health, Fengyang 233100, China;
| | - Yujun Zhu
- Guangdong Laboratory Animals Monitoring Institute and Guangdong Provincial Key Laboratory of Laboratory Animals, Guangzhou 510633, China;
| | - Feng Cong
- Guangdong Laboratory Animals Monitoring Institute and Guangdong Provincial Key Laboratory of Laboratory Animals, Guangzhou 510633, China;
| | - Shengwang Liu
- Division of Avian Infectious Diseases, State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin 150026, China;
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Wu X, Chu F, Zhang L, Chen S, Gao L, Zhang H, Huang H, Wang J, Chen M, Xie Z, Chen F, Zhang X, Xie Q. New rapid detection by using a constant temperature method for avian leukosis viruses. Front Microbiol 2022; 13:968559. [PMID: 36060773 PMCID: PMC9433894 DOI: 10.3389/fmicb.2022.968559] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2022] [Accepted: 07/28/2022] [Indexed: 11/17/2022] Open
Abstract
The avian leukemia virus causes avian leukemia (AL), a severe immunosuppressive disease in chickens (ALV). Since the 1990s, the diversity of ALV subpopulations caused by ALV genome variation and recombination, and the complexity of the infection and transmission, with currently no effective commercial vaccine and therapeutic for ALV, has resulted in severe economic losses to the chicken business in various parts of the world. Therefore, as a key means of prevention and control, an effective, rapid, and accurate detection method is imperative. A new real-time reverse transcription recombinase-aided amplification (RT-RAA) assay for ALV with rapid, highly specific, low-cost, and simple operational characteristics have been developed in this study. Based on the amplification of 114 base pairs from the ALV P12 gene, real-time RT-RAA primers and a probe were designed for this study. The lowest detection line was 10 copies of ALV RNA molecules per response, which could be carried out at 39°C in as fastest as 5 min and completed in 30 min, with no cross-reactivity with Marek's disease virus, avian reticuloendothelial virus, Newcastle disease virus, infectious bronchitis virus, infectious bursal disease virus, infectious laryngotracheitis virus, and avian influenza virus. Furthermore, the kappa value of 0.91 (>0.81) was compared with reverse transcription–polymerase chain reaction (RT-PCR) for 44 clinical samples, and the coefficients of variation were within 5.18% of the repeated assays with three low-level concentration gradients. These results indicate that using a real-time RT-RAA assay to detect ALV could be a valuable method.
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Affiliation(s)
- Xiuhong Wu
- Heyuan Branch, Guangdong Provincial Laboratory of Lingnan Modern Agricultural Science and Technology and Guangdong Provincial Key Lab of Agro-Animal Genomics and Molecular Breeding, College of Animal Science, South China Agricultural University, Guangzhou, China
- Guangdong Engineering Research Center for Vector Vaccine of Animal Virus, Guangzhou, China
- South China Collaborative Innovation Center for Poultry Disease Control and Product Safety, Guangzhou, China
| | - Fengsheng Chu
- Heyuan Branch, Guangdong Provincial Laboratory of Lingnan Modern Agricultural Science and Technology and Guangdong Provincial Key Lab of Agro-Animal Genomics and Molecular Breeding, College of Animal Science, South China Agricultural University, Guangzhou, China
- Guangdong Engineering Research Center for Vector Vaccine of Animal Virus, Guangzhou, China
- South China Collaborative Innovation Center for Poultry Disease Control and Product Safety, Guangzhou, China
| | - Luxuan Zhang
- School of Pharmaceutical Science, Sun Yat-sen University, Guangzhou, China
| | - Sheng Chen
- Heyuan Branch, Guangdong Provincial Laboratory of Lingnan Modern Agricultural Science and Technology and Guangdong Provincial Key Lab of Agro-Animal Genomics and Molecular Breeding, College of Animal Science, South China Agricultural University, Guangzhou, China
- Guangdong Engineering Research Center for Vector Vaccine of Animal Virus, Guangzhou, China
- South China Collaborative Innovation Center for Poultry Disease Control and Product Safety, Guangzhou, China
| | - Liguo Gao
- Heyuan Branch, Guangdong Provincial Laboratory of Lingnan Modern Agricultural Science and Technology and Guangdong Provincial Key Lab of Agro-Animal Genomics and Molecular Breeding, College of Animal Science, South China Agricultural University, Guangzhou, China
- Guangdong Engineering Research Center for Vector Vaccine of Animal Virus, Guangzhou, China
- South China Collaborative Innovation Center for Poultry Disease Control and Product Safety, Guangzhou, China
| | - Hao Zhang
- Heyuan Branch, Guangdong Provincial Laboratory of Lingnan Modern Agricultural Science and Technology and Guangdong Provincial Key Lab of Agro-Animal Genomics and Molecular Breeding, College of Animal Science, South China Agricultural University, Guangzhou, China
- Guangdong Engineering Research Center for Vector Vaccine of Animal Virus, Guangzhou, China
| | - Haohua Huang
- Heyuan Branch, Guangdong Provincial Laboratory of Lingnan Modern Agricultural Science and Technology and Guangdong Provincial Key Lab of Agro-Animal Genomics and Molecular Breeding, College of Animal Science, South China Agricultural University, Guangzhou, China
- Guangdong Engineering Research Center for Vector Vaccine of Animal Virus, Guangzhou, China
| | - Jin Wang
- Heyuan Branch, Guangdong Provincial Laboratory of Lingnan Modern Agricultural Science and Technology and Guangdong Provincial Key Lab of Agro-Animal Genomics and Molecular Breeding, College of Animal Science, South China Agricultural University, Guangzhou, China
- Guangdong Engineering Research Center for Vector Vaccine of Animal Virus, Guangzhou, China
| | - Mengjun Chen
- Heyuan Branch, Guangdong Provincial Laboratory of Lingnan Modern Agricultural Science and Technology and Guangdong Provincial Key Lab of Agro-Animal Genomics and Molecular Breeding, College of Animal Science, South China Agricultural University, Guangzhou, China
- Guangdong Engineering Research Center for Vector Vaccine of Animal Virus, Guangzhou, China
| | - Zi Xie
- Heyuan Branch, Guangdong Provincial Laboratory of Lingnan Modern Agricultural Science and Technology and Guangdong Provincial Key Lab of Agro-Animal Genomics and Molecular Breeding, College of Animal Science, South China Agricultural University, Guangzhou, China
- Guangdong Engineering Research Center for Vector Vaccine of Animal Virus, Guangzhou, China
- South China Collaborative Innovation Center for Poultry Disease Control and Product Safety, Guangzhou, China
| | - Feng Chen
- Heyuan Branch, Guangdong Provincial Laboratory of Lingnan Modern Agricultural Science and Technology and Guangdong Provincial Key Lab of Agro-Animal Genomics and Molecular Breeding, College of Animal Science, South China Agricultural University, Guangzhou, China
- Guangdong Engineering Research Center for Vector Vaccine of Animal Virus, Guangzhou, China
- South China Collaborative Innovation Center for Poultry Disease Control and Product Safety, Guangzhou, China
| | - Xinheng Zhang
- Heyuan Branch, Guangdong Provincial Laboratory of Lingnan Modern Agricultural Science and Technology and Guangdong Provincial Key Lab of Agro-Animal Genomics and Molecular Breeding, College of Animal Science, South China Agricultural University, Guangzhou, China
- Guangdong Engineering Research Center for Vector Vaccine of Animal Virus, Guangzhou, China
- South China Collaborative Innovation Center for Poultry Disease Control and Product Safety, Guangzhou, China
- *Correspondence: Xinheng Zhang
| | - Qingmei Xie
- Heyuan Branch, Guangdong Provincial Laboratory of Lingnan Modern Agricultural Science and Technology and Guangdong Provincial Key Lab of Agro-Animal Genomics and Molecular Breeding, College of Animal Science, South China Agricultural University, Guangzhou, China
- Guangdong Engineering Research Center for Vector Vaccine of Animal Virus, Guangzhou, China
- South China Collaborative Innovation Center for Poultry Disease Control and Product Safety, Guangzhou, China
- Qingmei Xie
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Islam MM, Koirala D. Toward a next-generation diagnostic tool: A review on emerging isothermal nucleic acid amplification techniques for the detection of SARS-CoV-2 and other infectious viruses. Anal Chim Acta 2022; 1209:339338. [PMID: 35569864 PMCID: PMC8633689 DOI: 10.1016/j.aca.2021.339338] [Citation(s) in RCA: 19] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2021] [Revised: 11/22/2021] [Accepted: 11/27/2021] [Indexed: 01/09/2023]
Abstract
As the COVID-19 pandemic continues to affect human health across the globe rapid, simple, point-of-care (POC) diagnosis of infectious viruses such as SARS-CoV-2 remains challenging. Polymerase chain reaction (PCR)-based diagnosis has risen to meet these demands and despite its high-throughput and accuracy, it has failed to gain traction in the rapid, low-cost, point-of-test settings. In contrast, different emerging isothermal amplification-based detection methods show promise in the rapid point-of-test market. In this comprehensive study of the literature, several promising isothermal amplification methods for the detection of SARS-CoV-2 are critically reviewed that can also be applied to other infectious viruses detection. Starting with a brief discussion on the SARS-CoV-2 structure, its genomic features, and the epidemiology of the current pandemic, this review focuses on different emerging isothermal methods and their advancement. The potential of isothermal amplification combined with the revolutionary CRISPR/Cas system for a more powerful detection tool is also critically reviewed. Additionally, the commercial success of several isothermal methods in the pandemic are highlighted. Different variants of SARS-CoV-2 and their implication on isothermal amplifications are also discussed. Furthermore, three most crucial aspects in achieving a simple, fast, and multiplexable platform are addressed.
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Wu XH, Yao ZQ, Zhao QQ, Chen S, Hu ZZ, Xie Z, Chen LY, Ji J, Chen F, Zhang XH, Xie QM. Development and application of a reverse-transcription recombinase-aided amplification assay for subgroup J Avian leukosis virus. Poult Sci 2022; 101:101743. [PMID: 35240352 PMCID: PMC8889409 DOI: 10.1016/j.psj.2022.101743] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2021] [Revised: 01/15/2022] [Accepted: 01/17/2022] [Indexed: 11/29/2022] Open
Abstract
Subgroup J Avian leukosis virus (ALV-J) is an important pathogen of poultry tumor diseases. Since its discovery, it has caused significant economic losses to the poultry industry. Thus, the rapid detection of molecular level with strong specificity is particularly important whether poultry are infected with ALV-J. In this study, we designed primers and probe for real-time fluorescent reverse-transcription recombinase-aided amplification assay (RT-RAA) based on the ALV-J gp85 sequence. We had established a real-time fluorescent RT-RAA method and confirmed this system by verifying the specificity and sensitivity of the primers and probe. In addition, repeatability tests and clinical sample regression tests were used for preliminary evaluation of this detection method. The sensitivity of established method was about 101 copies/μL, and the repeatability of the CV of the CT value is 4%, indicating repeatability is good. Moreover, there was no cross-reactivity with NDV, IBV, IBDV, H9N2, MDV, and REV, and other avian leukosis virus subgroups, such as subgroups A, B, C, D, K and E. Importantly, the real-time fluorescent RT-RAA completed the test within 30 min at a constant temperature of 41°C. Forty-two clinical samples with known background were tested, and the test results were coincided with 100%. Overall, these results suggested that the real-time fluorescent RT-RAA developed in this study had strong specificity, high sensitivity, and good feasibility. The method is simple, easy, and portable, that is suitable for clinical and laboratory diagnosis, and provides technical support for the prevention and control of ALV-J.
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Affiliation(s)
- X H Wu
- Heyuan Branch, Guangdong Provincial Laboratory of Lingnan Modern Agricultural Science and Technology, College of Animal Science, South China Agricultural University, Guangzhou 510642, P. R. China; Guangdong Engineering Research Center for Vector Vaccine of Animal Virus, Guangzhou 510642, P. R. China; South China Collaborative Innovation Center for Poultry Disease Control and Product Safety, Guangzhou 510642, P. R. China
| | - Z Q Yao
- Heyuan Branch, Guangdong Provincial Laboratory of Lingnan Modern Agricultural Science and Technology, College of Animal Science, South China Agricultural University, Guangzhou 510642, P. R. China; Guangdong Engineering Research Center for Vector Vaccine of Animal Virus, Guangzhou 510642, P. R. China; South China Collaborative Innovation Center for Poultry Disease Control and Product Safety, Guangzhou 510642, P. R. China
| | - Q Q Zhao
- Heyuan Branch, Guangdong Provincial Laboratory of Lingnan Modern Agricultural Science and Technology, College of Animal Science, South China Agricultural University, Guangzhou 510642, P. R. China; Guangdong Engineering Research Center for Vector Vaccine of Animal Virus, Guangzhou 510642, P. R. China; South China Collaborative Innovation Center for Poultry Disease Control and Product Safety, Guangzhou 510642, P. R. China
| | - S Chen
- Heyuan Branch, Guangdong Provincial Laboratory of Lingnan Modern Agricultural Science and Technology, College of Animal Science, South China Agricultural University, Guangzhou 510642, P. R. China; Guangdong Engineering Research Center for Vector Vaccine of Animal Virus, Guangzhou 510642, P. R. China; South China Collaborative Innovation Center for Poultry Disease Control and Product Safety, Guangzhou 510642, P. R. China
| | - Z Z Hu
- Heyuan Branch, Guangdong Provincial Laboratory of Lingnan Modern Agricultural Science and Technology, College of Animal Science, South China Agricultural University, Guangzhou 510642, P. R. China; Guangdong Engineering Research Center for Vector Vaccine of Animal Virus, Guangzhou 510642, P. R. China; South China Collaborative Innovation Center for Poultry Disease Control and Product Safety, Guangzhou 510642, P. R. China
| | - Z Xie
- Heyuan Branch, Guangdong Provincial Laboratory of Lingnan Modern Agricultural Science and Technology, College of Animal Science, South China Agricultural University, Guangzhou 510642, P. R. China; Guangdong Engineering Research Center for Vector Vaccine of Animal Virus, Guangzhou 510642, P. R. China; South China Collaborative Innovation Center for Poultry Disease Control and Product Safety, Guangzhou 510642, P. R. China
| | - L Y Chen
- Heyuan Branch, Guangdong Provincial Laboratory of Lingnan Modern Agricultural Science and Technology, College of Animal Science, South China Agricultural University, Guangzhou 510642, P. R. China; Guangdong Engineering Research Center for Vector Vaccine of Animal Virus, Guangzhou 510642, P. R. China; South China Collaborative Innovation Center for Poultry Disease Control and Product Safety, Guangzhou 510642, P. R. China
| | - J Ji
- Henan Provincial Engineering and Technology Center of Health Products for Livestock and Poultry, Nanyang Normal University, Nanyang 473061, P. R. China
| | - F Chen
- Heyuan Branch, Guangdong Provincial Laboratory of Lingnan Modern Agricultural Science and Technology, College of Animal Science, South China Agricultural University, Guangzhou 510642, P. R. China; Guangdong Engineering Research Center for Vector Vaccine of Animal Virus, Guangzhou 510642, P. R. China; South China Collaborative Innovation Center for Poultry Disease Control and Product Safety, Guangzhou 510642, P. R. China; Key Laboratory of Animal Health Aquaculture and Environmental Control, Guangzhou, Guangdong 510642, P. R. China
| | - X H Zhang
- Heyuan Branch, Guangdong Provincial Laboratory of Lingnan Modern Agricultural Science and Technology, College of Animal Science, South China Agricultural University, Guangzhou 510642, P. R. China; Guangdong Engineering Research Center for Vector Vaccine of Animal Virus, Guangzhou 510642, P. R. China; South China Collaborative Innovation Center for Poultry Disease Control and Product Safety, Guangzhou 510642, P. R. China; Key Laboratory of Animal Health Aquaculture and Environmental Control, Guangzhou, Guangdong 510642, P. R. China
| | - Q M Xie
- Heyuan Branch, Guangdong Provincial Laboratory of Lingnan Modern Agricultural Science and Technology, College of Animal Science, South China Agricultural University, Guangzhou 510642, P. R. China; Guangdong Engineering Research Center for Vector Vaccine of Animal Virus, Guangzhou 510642, P. R. China; South China Collaborative Innovation Center for Poultry Disease Control and Product Safety, Guangzhou 510642, P. R. China; Key Laboratory of Animal Health Aquaculture and Environmental Control, Guangzhou, Guangdong 510642, P. R. China.
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9
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Padzil F, Mariatulqabtiah AR, Tan WS, Ho KL, Isa NM, Lau HY, Abu J, Chuang KP. Loop-Mediated Isothermal Amplification (LAMP) as a Promising Point-of-Care Diagnostic Strategy in Avian Virus Research. Animals (Basel) 2021; 12:ani12010076. [PMID: 35011181 PMCID: PMC8744981 DOI: 10.3390/ani12010076] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2021] [Revised: 12/02/2021] [Accepted: 12/04/2021] [Indexed: 12/16/2022] Open
Abstract
Simple Summary Many of the existing screening methods of avian viruses depend on clinical symptoms and pathological gross examinations that still necessitate confirmatory microscopic testing. Confirmation of a virus is often conducted at centralized laboratories that are well-equipped with instruments for virus isolation, hemagglutinin inhibition, virus neutralization, ELISA, PCR and qPCR. These assays are known for their great accuracy and sensitivity, and hence are set as standard practices. Nevertheless, limitations arise due to the time, cost and on-site applicability. As the technology progresses, molecular diagnostics should be more accessible to isolated areas and even practicable for use by non-skilled personnel such as farmers and private breeders. One of the point-of-care diagnostic strategies to consider for such matters is loop-mediated isothermal amplification (LAMP). Abstract Over the years, development of molecular diagnostics has evolved significantly in the detection of pathogens within humans and their surroundings. Researchers have discovered new species and strains of viruses, while mitigating the viral infections that occur, owing to the accessibility of nucleic acid screening methods such as polymerase chain reaction (PCR), quantitative (real-time) polymerase chain reaction (qPCR) and reverse-transcription qPCR (RT-qPCR). While such molecular detection methods are widely utilized as the benchmark, the invention of isothermal amplifications has also emerged as a reliable tool to improvise on-field diagnosis without dependence on thermocyclers. Among the established isothermal amplification technologies are loop-mediated isothermal amplification (LAMP), recombinant polymerase amplification (RPA), strand displacement activity (SDA), nucleic acid sequence-based amplification (NASBA), helicase-dependent amplification (HDA) and rolling circle amplification (RCA). This review highlights the past research on and future prospects of LAMP, its principles and applications as a promising point-of-care diagnostic method against avian viruses.
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Affiliation(s)
- Faiz Padzil
- Laboratory of Vaccine and Biomolecules, Institute of Bioscience, Universiti Putra Malaysia, Serdang 43400, Selangor, Malaysia; (F.P.); (W.S.T.); (N.M.I.)
- Institute for Medical Research, National Institute of Health, Setia Alam, Shah Alam 40170, Selangor, Malaysia
| | - Abdul Razak Mariatulqabtiah
- Laboratory of Vaccine and Biomolecules, Institute of Bioscience, Universiti Putra Malaysia, Serdang 43400, Selangor, Malaysia; (F.P.); (W.S.T.); (N.M.I.)
- Department of Cell and Molecular Biology, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, Serdang 43400, Selangor, Malaysia
- Correspondence: ; Tel.: +60-297-691-938
| | - Wen Siang Tan
- Laboratory of Vaccine and Biomolecules, Institute of Bioscience, Universiti Putra Malaysia, Serdang 43400, Selangor, Malaysia; (F.P.); (W.S.T.); (N.M.I.)
- Department of Microbiology, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, Serdang 43400, Selangor, Malaysia
| | - Kok Lian Ho
- Department of Pathology, Faculty of Medicine and Health Sciences, Universiti Putra Malaysia, Serdang 43400, Selangor, Malaysia;
| | - Nurulfiza Mat Isa
- Laboratory of Vaccine and Biomolecules, Institute of Bioscience, Universiti Putra Malaysia, Serdang 43400, Selangor, Malaysia; (F.P.); (W.S.T.); (N.M.I.)
- Department of Cell and Molecular Biology, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, Serdang 43400, Selangor, Malaysia
| | - Han Yih Lau
- Biotechnology and Nanotechnology Research Centre, Malaysian Agricultural Research and Development Institute (MARDI), Persiaran MARDI-UPM, Serdang 43400, Selangor, Malaysia;
| | - Jalila Abu
- Department of Veterinary Clinical Studies, Faculty of Veterinary Medicine, Universiti Putra Malaysia, Serdang 43400, Selangor, Malaysia;
| | - Kuo-Pin Chuang
- International Degree Program in Animal Vaccine Technology, International College, National Pingtung University of Science and Technology, Pingtung 912, Taiwan;
- Graduate Institute of Animal Vaccine Technology, College of Veterinary Medicine, National Pingtung University of Science and Technology, Pingtung 912, Taiwan
- School of Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung 807, Taiwan
- Research Center for Animal Biologics, National Pingtung University of Science and Technology, Pingtung 912, Taiwan
- School of Dentistry, Kaohsiung Medical University, Kaohsiung 807, Taiwan
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10
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Wang H, Chen X, Zhu L, Fang X, Gao K, Fang C, Liu J, Gu Y, Liang X, Yang Y. Preparation of a novel monoclonal antibody against Avian leukosis virus subgroup J Gp85 protein and identification of its epitope. Poult Sci 2021; 100:101108. [PMID: 34116348 PMCID: PMC8192869 DOI: 10.1016/j.psj.2021.101108] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2020] [Revised: 03/01/2021] [Accepted: 03/02/2021] [Indexed: 11/22/2022] Open
Abstract
Avian leukosis virus subgroup J (ALV-J) is an avian oncogenic retrovirus that has caused huge economic losses in the poultry industry due to its great pathogenicity and transmission ability. However, the continuous emergence of new strains would bring challenges to diagnosis and control of ALV-J. .This study focuses on preparing the monoclonal antibody (MAb) against ALV-J Gp85 and identifying its epitope. The truncated ALV-J gp85 gene fragment was amplified and then cloned into expression vectors. Purified GST-Gp85 was used to immune mice and His-Gp85 was used to screen MAb. Finally, a hybridoma cell line named J16 that produced specific MAb against the ALV-J. Immunofluorescence assay showed that MAb J16 specifically recognized ALV-J rather than ALV-A or ALV-K infected DF-1 cells. To identify the epitope recognized by MAb J16, fourteen partially overlapping ALV-J Gp85 fragments were prepared and tested by Western blot. The results indicated that peptide 150-LIRPYVNQ-157 was the minimal epitope of ALV-J Gp85 recognized by MAb J16. Alignment analysis of Gp85 from different ALV subgroups showed that the epitope keep high conservation among 36 ALV-J strains, but significant different from that of ALV subgroup A, B, C, D, E and K. Overall, we prepared a MAb specific against ALV-J and identified peptide 150-LIRPYVNQ-157 as a novel specific epitope of ALV-J Gp85, which may assist in laying the foundation for specific ALV-J detection methods.
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Affiliation(s)
- Houkun Wang
- School of Animal Science, Yangtze University, Jingzhou 434025, China
| | - Xueyang Chen
- School of Animal Science, Yangtze University, Jingzhou 434025, China
| | - Lilin Zhu
- School of Animal Science, Yangtze University, Jingzhou 434025, China
| | - Xiaowei Fang
- School of Animal Science, Yangtze University, Jingzhou 434025, China
| | - Keli Gao
- School of Animal Science, Yangtze University, Jingzhou 434025, China
| | - Chun Fang
- School of Animal Science, Yangtze University, Jingzhou 434025, China
| | - Jing Liu
- School of Animal Science, Yangtze University, Jingzhou 434025, China
| | - Yufang Gu
- School of Animal Science, Yangtze University, Jingzhou 434025, China
| | - Xiongyan Liang
- School of Animal Science, Yangtze University, Jingzhou 434025, China
| | - Yuying Yang
- School of Animal Science, Yangtze University, Jingzhou 434025, China.
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11
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Rapid detection of avian leukosis virus subgroup J by cross-priming amplification. Sci Rep 2021; 11:10946. [PMID: 34040071 PMCID: PMC8155010 DOI: 10.1038/s41598-021-90479-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2020] [Accepted: 05/12/2021] [Indexed: 11/30/2022] Open
Abstract
Avian leukosis virus subgroup J (ALV-J) causes oncogenic disease in chickens in China, resulting in great harm to poultry production, and remains widespread in China. Herein, we employed a cross-priming amplification (CPA) approach and a nucleic acid detection device to establish a visual rapid detection method for ALV-J. The sensitivity of CPA, polymerase chain reaction (PCR) and real-time PCR (RT-PCR) was compared, and the three methods were used to detect ALV-J in the cell cultures which inoculated with clinical plasma. The result showed when the amplification reaction was carried out at 60 °C for just 60 min, the sensitivity of CPA was 10 times higher than conventional PCR, with high specificity, which was comparable with RT-PCR, based on detection of 123 cell cultures which inoculated with clinical plasma, the coincidence rate with real-time PCR was 97.3% (71/73). CPA detection of ALV-J does not require an expensive PCR instrument; a simple water bath or incubator is sufficient for complete DNA amplification, and the closed nucleic acid detection device avoids aerosol pollution, making judgment of results more intuitive and objective. The CPA assay would be a promising simple, rapid and sensitive method for identification of ALV-J.
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12
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Loop-mediated Isothermal Amplification (LAMP) for Identification of Pythium insidiosum. Int J Infect Dis 2020; 101:149-159. [PMID: 32987181 DOI: 10.1016/j.ijid.2020.09.1430] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2020] [Revised: 09/18/2020] [Accepted: 09/19/2020] [Indexed: 02/07/2023] Open
Abstract
OBJECTIVE Pythium insidiosum causes a life-threatening condition called pythiosis. High morbidity and mortality of pythiosis are consequences of delayed diagnosis. We aimed to develop a loop-mediated isothermal amplification (LAMP) assay for the rapid detection of P. insidiosum for use in remote areas, where pythiosis is prevalent. METHODS We designed four LAMP primers to amplify the rDNA sequence. A side-by-side comparison evaluated performances of LAMP and the previously-established multiplex PCR (M-PCR), using gDNA samples extracted from colonies of P. insidiosum (n = 28) and other fungi (n = 54), and tissues of animals with (n = 16) or without (n = 13) pythiosis. RESULTS LAMP demonstrated a 50% shorter assay duration (1.5 h) and a 10-fold lower limit of detection (10-4 ng) than did M-PCR. Based on colony-extracted gDNAs, LAMP and M-PCR correctly reported P. insidiosum in all 28 samples, providing 100% sensitivity. While M-PCR did not amplify all fungal controls (100% specificity), LAMP falsely detected one organism (98% specificity). Based on the clinical samples, LAMP and M-PCR provided an equivalently-high specificity (100%). However, LAMP showed a markedly-higher sensitivity than that of M-PCR (88% vs. 56%). CONCLUSIONS LAMP is a simple, useful, efficient assay for the detection of P. insidiosum in clinical specimens and pure cultures in resource-limited laboratories.
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13
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Wang H, Guan J, Liu X, Shi Y, Wu Q, Luo M, Zhu Y, Wang Z, Wang L, Pan Y. Rapid detection of avian leukosis virus using a fluorescent microsphere immunochromatographic test strip assay. Poult Sci 2020; 98:6492-6496. [PMID: 31553793 PMCID: PMC8913972 DOI: 10.3382/ps/pez547] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2019] [Accepted: 09/09/2019] [Indexed: 01/23/2023] Open
Abstract
We developed a rapid fluorescent microsphere immunochromatographic test strip (FM-ICTS) assay for the quantitative detection of avian leukosis virus (ALV). A monoclonal antibody specific for the ALV major capsid protein encoded by the gag gene was coupled to label fluorescent microspheres. ALV antibodies were coated on a nitrocellulose membrane to prepare a test line for sample detection. The fluorescence signals of the test and control lines can be read either visually by exposure to UV light or using a fluorescence analyzer. ALV could be detected quantitatively using the ratio of fluorescence signals of the test and control lines (T/C). The assay threshold was determined as a T/C value of 0.0606. The fitting curve equation was established between 1 and 2,048 ng/mL P27 protein with an r2 value of 0.9998. The assay showed no cross reactivity with Newcastle disease virus, infectious laryngotracheitis virus, infectious bronchitis virus, Marek's disease virus, infectious bursal disease, Reoviridae virus, or avian influenza virus. The repeatability was satisfactory with an overall average CV of 8.65%. The Kappa coefficient between a commercial ELISA kit was 0.7031 using clinical chicken meconium samples. Thus, a simple, rapid, sensitive, and specific fluorescent microsphere immunochromatographic test strip was developed based on specific anti-capsid protein p27 monoclonal antibodies.
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Affiliation(s)
- Huanan Wang
- Department of Veterinary Medicine, Zhejiang Provincial Key Laboratory of Preventive Veterinary Medicine and College of Animal Sciences, Zhejiang University, Hangzhou 310058, China
| | - Jianchi Guan
- College of Animal Science and Technology, Guangdong Polytechnic of Science and Trade, Guangzhou 510640, China
| | - Xiangnan Liu
- College of Animal Science and Technology, Guangdong Polytechnic of Science and Trade, Guangzhou 510640, China.,Guangzhou Veterinary Biotechnology Co.Ltd, Guangzhou 510000, China
| | - Yue Shi
- Beijing Senkang Biotech Development Co., Ltd, Beijing 101400, China
| | - Qiwen Wu
- Guangzhou Veterinary Biotechnology Co.Ltd, Guangzhou 510000, China
| | - Mengzhen Luo
- Guangzhou Veterinary Biotechnology Co.Ltd, Guangzhou 510000, China
| | - Yujun Zhu
- Guangzhou Bozhi Biotechnology Co.Ltd, Guangzhou 510000, China
| | - Zizengchen Wang
- Department of Veterinary Medicine, Zhejiang Provincial Key Laboratory of Preventive Veterinary Medicine and College of Animal Sciences, Zhejiang University, Hangzhou 310058, China
| | - Lefeng Wang
- Department of Veterinary Medicine, Zhejiang Provincial Key Laboratory of Preventive Veterinary Medicine and College of Animal Sciences, Zhejiang University, Hangzhou 310058, China
| | - Yu Pan
- Guangzhou Veterinary Biotechnology Co.Ltd, Guangzhou 510000, China
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14
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Zhao ZJ, Rao MZ, Chen J, Zhang J, Yuan L, Liao M, Cao W. A cell line resistant to avian leukosis virus subgroup B infection. Poult Sci 2020; 98:6026-6033. [PMID: 31376350 PMCID: PMC6771772 DOI: 10.3382/ps/pez414] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2018] [Accepted: 07/06/2019] [Indexed: 11/20/2022] Open
Abstract
The expression of env proteins that bind to viral cell receptors on avian leukosis virus (ALV)-susceptible cells can block ALV infection. In this study, we constructed a cell line (DF-1/B) by expressing the ALV-B env protein in DF-1 cells. PCR, immune fluorescence assay, Western blot, and immune electron microscopy results showed that the env gene can be stably expressed in DF-1cells and the env protein could be detected on the DF-1 cell membrane. An antiviral experiment concluded that the DF-1/B cell line could be resistant to 1 × 104 TCID50 ALV-B virus infection, but had no inhibitory effect on other subgroup ALV. This means that the DF-1/B cell line is specifically resistant to ALV-B and can be used as a tool for ALV-B diagnosis.
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Affiliation(s)
- Zi Jun Zhao
- Key Laboratory of Veterinary Vaccine Innovation of the Ministry of Agriculture, Key Laboratory of Zoonosis Prevention and Control of Guangdong Province, PR China, College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China
| | - Ming Zhang Rao
- Key Laboratory of Veterinary Vaccine Innovation of the Ministry of Agriculture, Key Laboratory of Zoonosis Prevention and Control of Guangdong Province, PR China, College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China
| | - Jian Chen
- Key Laboratory of Veterinary Vaccine Innovation of the Ministry of Agriculture, Key Laboratory of Zoonosis Prevention and Control of Guangdong Province, PR China, College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China
| | - Jie Zhang
- Key Laboratory of Veterinary Vaccine Innovation of the Ministry of Agriculture, Key Laboratory of Zoonosis Prevention and Control of Guangdong Province, PR China, College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China
| | - Lixia Yuan
- Key Laboratory of Veterinary Vaccine Innovation of the Ministry of Agriculture, Key Laboratory of Zoonosis Prevention and Control of Guangdong Province, PR China, College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China
| | - Ming Liao
- Key Laboratory of Veterinary Vaccine Innovation of the Ministry of Agriculture, Key Laboratory of Zoonosis Prevention and Control of Guangdong Province, PR China, College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China
| | - Weisheng Cao
- Key Laboratory of Veterinary Vaccine Innovation of the Ministry of Agriculture, Key Laboratory of Zoonosis Prevention and Control of Guangdong Province, PR China, College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China
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15
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Zhao VXT, Wong TI, Zheng XT, Tan YN, Zhou X. Colorimetric biosensors for point-of-care virus detections. MATERIALS SCIENCE FOR ENERGY TECHNOLOGIES 2019; 3:237-249. [PMID: 33604529 PMCID: PMC7148662 DOI: 10.1016/j.mset.2019.10.002] [Citation(s) in RCA: 54] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/23/2019] [Revised: 10/13/2019] [Accepted: 10/14/2019] [Indexed: 05/05/2023]
Abstract
Colorimetric biosensors can be used to detect a particular analyte through color changes easily by naked eyes or simple portable optical detectors for quantitative measurement. Thus, it is highly attractive for point-of-care detections of harmful viruses to prevent potential pandemic outbreak, as antiviral medication must be administered in a timely fashion. This review paper summaries existing and emerging techniques that can be employed to detect viruses through colorimetric assay design with detailed discussion of their sensing principles, performances as well as pros and cons, with an aim to provide guideline on the selection of suitable colorimetric biosensors for detecting different species of viruses. Among the colorimetric methods for virus detections, loop-mediated isothermal amplification (LAMP) method is more favourable for its faster detection, high efficiency, cheaper cost, and more reliable with high reproducible assay results. Nanoparticle-based colorimetric biosensors, on the other hand, are most suitable to be fabricated into lateral flow or lab-on-a-chip devices, and can be coupled with LAMP or portable PCR systems for highly sensitive on-site detection of viruses, which is very critical for early diagnosis of virus infections and to prevent outbreak in a swift and controlled manner.
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Affiliation(s)
- Victoria Xin Ting Zhao
- College of Engineering, Nanyang Technological University, 70 Nanyang Drive, Singapore 637457, Singapore
| | - Ten It Wong
- Institute of Materials Research and Engineering, ASTAR (Agency for Science, Technology and Research), 2 Fusionopolis Way, #08-03, Innovis, Singapore 138634, Singapore
| | - Xin Ting Zheng
- Institute of Materials Research and Engineering, ASTAR (Agency for Science, Technology and Research), 2 Fusionopolis Way, #08-03, Innovis, Singapore 138634, Singapore
| | - Yen Nee Tan
- Institute of Materials Research and Engineering, ASTAR (Agency for Science, Technology and Research), 2 Fusionopolis Way, #08-03, Innovis, Singapore 138634, Singapore
- Faculty of Science, Agriculture & Engineering, Newcastle University, Newcastle Upon Tyne NE1 7RU, United Kingdom
| | - Xiaodong Zhou
- Institute of Materials Research and Engineering, ASTAR (Agency for Science, Technology and Research), 2 Fusionopolis Way, #08-03, Innovis, Singapore 138634, Singapore
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16
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GHODSIAN S, ROUHANI S, FALLAHI S, SEYYEDTABAEI SJ, TAGHIPOUR N. Detection of Spiked Fasciola hepatica Eggs in Stool Specimens Using LAMP Technique. IRANIAN JOURNAL OF PARASITOLOGY 2019; 14:387-393. [PMID: 31673256 PMCID: PMC6815858] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 10/29/2022]
Abstract
BACKGROUND Fascioliasis is one of the most important food-borne worm disease caused by Fasciola sp. Parasitological diagnosis is more difficult due to the low parasite burden and a few eggs shedding of helminths. Therefore, it will be valuable to development of simple, fast and reliable diagnostic tests for detection of human and animal fascioliasis. METHODS Infected liver collected from abattoir in Tehran, Iran in 2017. F. hepatica eggs were detached from the uterus of worms under a stereo microscope. Various numbers of eggs were spiked to 200 mgr. of negative feces samples. DNA was extracted and then target regions (nuclear IGS) were amplified by LAMP assay using six primers. Fecal specimens without egg and DNA of other helminths were used as negative controls. F. hepatica sample which confirmed by morphologic criteria and PCR-RFLP was used as positive control. RESULTS LAMP products by using SYBR Green I could detect even a single egg in fecal samples which was visible by change of color from orange to green. There was no cross amplification by other helminths including; Taenia saginata, Dicrosolium dendriticum and F. gigantica. CONCLUSION LAMP seems a rapid, sensitive, cost-effective technique for detection of human fascioliasis.
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Affiliation(s)
- Sahar GHODSIAN
- Department of Parasitology and Mycology, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Soheila ROUHANI
- Department of Parasitology and Mycology, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran,Correspondence
| | - Shirzad FALLAHI
- Department of Parasitology and Mycology, School of Medicine, Lorestan University of Medical Sciences, Khorramabad, Iran
| | - Seyyed Javad SEYYEDTABAEI
- Department of Parasitology and Mycology, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Niloofar TAGHIPOUR
- Department of Parasitology and Mycology, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
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17
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Chen J, Zhao Z, Chen Y, Zhang J, Yan L, Zheng X, Liao M, Cao W. Development and application of a SYBR green real-time PCR for detection of the emerging avian leukosis virus subgroup K. Poult Sci 2018; 97:2568-2574. [PMID: 29617900 PMCID: PMC6016701 DOI: 10.3382/ps/pey086] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2017] [Accepted: 03/19/2018] [Indexed: 12/23/2022] Open
Abstract
Avian leukosis virus subgroup K (ALV-K) is an emerging ALV tumor virus of chickens. We developed a SYBR green-based real-time polymerase chain reaction (PCR) assay for the rapid and economical detection of ALV-K in chicken flocks. The assay was specific for ALV-K and did not cross-react with other ALV subgroup or avian influenza virus, Newcastle disease virus, or Marek's Disease virus. The method was 100 times more sensitive than conventional PCR and 10 times more sensitive than the enzyme-linked immunosorbent assay (ELISA) for the P27 antigen. The assay was also more sensitive than conventional PCR in tests of 86 clinical plasma samples. DF-1 tissue culture cells infected with 1 TCID50 ALV-K particle were identified as negative using ELISA but tested positive with the real-time PCR method. The viral loads in organs and tissues in infected chickens were highest in kidney, lungs, and glandular stomach, and these results matched ELISA findings.
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Affiliation(s)
- Jian Chen
- College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, People's Republic of China
| | - Zijun Zhao
- College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, People's Republic of China
| | - Yangyijun Chen
- College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, People's Republic of China
| | - Jie Zhang
- College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, People's Republic of China
| | - Lifu Yan
- College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, People's Republic of China
| | - Xiaocui Zheng
- College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, People's Republic of China
| | - Ming Liao
- College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, People's Republic of China.,Key Laboratory of Veterinary Vaccine Innovation of the Ministry of Agriculture.,South China Collaborative Innovation Center for Prevention and Control of Poultry Infectious Diseases and Safety of Poultry Products, Guangzhou, People's Republic of China.,National and Regional Joint Engineering Laboratory for Medicament of Zoonosis Prevention and Control, People's Republic of China.,Key Laboratory of Zoonosis Prevention and Control of Guangdong Province, People's Republic of China
| | - Weisheng Cao
- College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, People's Republic of China.,Key Laboratory of Veterinary Vaccine Innovation of the Ministry of Agriculture.,South China Collaborative Innovation Center for Prevention and Control of Poultry Infectious Diseases and Safety of Poultry Products, Guangzhou, People's Republic of China.,National and Regional Joint Engineering Laboratory for Medicament of Zoonosis Prevention and Control, People's Republic of China.,Key Laboratory of Zoonosis Prevention and Control of Guangdong Province, People's Republic of China
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18
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Mingzhang R, Zijun Z, Lixia Y, Jian C, Min F, Jie Z, Ming L, Weisheng C. The construction and application of a cell line resistant to novel subgroup avian leukosis virus (ALV-K) infection. Arch Virol 2017; 163:89-98. [PMID: 28986681 PMCID: PMC5756289 DOI: 10.1007/s00705-017-3563-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2017] [Accepted: 08/03/2017] [Indexed: 11/26/2022]
Abstract
A novel avian leukosis viruses (ALV) subgroup named ALV-K was recently isolated from Chinese indigenous chickens which is different from the subgroups (A to E and J) that have previously been reported to infect chickens. More and more ALV-K strains have recently been isolated from local breeds of Chinese chickens. However, there are no more effective diagnostic methods for ALV-K other than virus isolation followed by envelope gene sequencing and comparison. Viral infection can be blocked through expression of the viral receptor-binding protein. In this study, we have engineered a cell line, DF-1/K, that expresses ALV-K env protein and thereby confers resistance to ALV-K infection. DF-1/K can be used in combination with the ALV-K susceptible cell line DF-1 as a specific diagnostic tool for ALV-K and provides a good tool for further research into the molecular mechanisms of interaction between ALV-K env protein and the host cell receptor.
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Affiliation(s)
- Rao Mingzhang
- College of Veterinary Medicine, South China Agricultural University, 483 Wushan Road, Tianhe District, Guangzhou, 510642, People's Republic of China
| | - Zhao Zijun
- College of Veterinary Medicine, South China Agricultural University, 483 Wushan Road, Tianhe District, Guangzhou, 510642, People's Republic of China
| | - Yuan Lixia
- College of Veterinary Medicine, South China Agricultural University, 483 Wushan Road, Tianhe District, Guangzhou, 510642, People's Republic of China
| | - Chen Jian
- College of Veterinary Medicine, South China Agricultural University, 483 Wushan Road, Tianhe District, Guangzhou, 510642, People's Republic of China
| | - Feng Min
- College of Veterinary Medicine, South China Agricultural University, 483 Wushan Road, Tianhe District, Guangzhou, 510642, People's Republic of China
| | - Zhang Jie
- College of Veterinary Medicine, South China Agricultural University, 483 Wushan Road, Tianhe District, Guangzhou, 510642, People's Republic of China
| | - Liao Ming
- College of Veterinary Medicine, South China Agricultural University, 483 Wushan Road, Tianhe District, Guangzhou, 510642, People's Republic of China.
- Key Laboratory of Veterinary Vaccine Innovation of the Ministry of Agriculture, Guangzhou, People's Republic of China.
- South China Collaborative Innovation Center for Prevention and Control of Poultry Infectious Diseases and Safety of Poultry Products, Guangzhou, People's Republic of China.
- National and Regional Joint Engineering Laboratory for Medicament of Zoonosis Prevention and Control, Guangzhou, People's Republic of China.
- Key Laboratory of Zoonosis Prevention and Control of Guangdong Province, Guangzhou, People's Republic of China.
| | - Cao Weisheng
- College of Veterinary Medicine, South China Agricultural University, 483 Wushan Road, Tianhe District, Guangzhou, 510642, People's Republic of China.
- Key Laboratory of Veterinary Vaccine Innovation of the Ministry of Agriculture, Guangzhou, People's Republic of China.
- South China Collaborative Innovation Center for Prevention and Control of Poultry Infectious Diseases and Safety of Poultry Products, Guangzhou, People's Republic of China.
- National and Regional Joint Engineering Laboratory for Medicament of Zoonosis Prevention and Control, Guangzhou, People's Republic of China.
- Key Laboratory of Zoonosis Prevention and Control of Guangdong Province, Guangzhou, People's Republic of China.
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Khairy WOA, Wang L, Tian X, Ye J, Qian K, Shao H, Qin A. Identification of a novel linear B-cell epitope in the p27 of Avian leukosis virus. Virus Res 2017; 238:253-257. [PMID: 28698047 DOI: 10.1016/j.virusres.2017.07.007] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2017] [Revised: 07/04/2017] [Accepted: 07/05/2017] [Indexed: 11/18/2022]
Abstract
Avian leukosis virus (ALV) is an avian oncogenic retrovirus that can induce virus-associated neoplasia and causes great economic loss in poultry industry. It is known that the capsid antigen p27 is the group-specific antigen that is highly conserved among all ALV subgroups, and is the most abundant immunogenic viral protein. In the present study, five overlapping fragments (GST- p27-F1/2, GST- p27-F2-1/2/3) of ALV-p27 were subjected to Western blotting analysis using a monoclonal antibody (5D3) against ALV-p27 to identify the epitope. The result showed that the epitope recognized by 5D3 is located within 173-240 amino acid of the ALV-p27 protein. For precise mapping of this epitope, a set of overlapping peptides were synthesized. Indirect enzyme linked immunosorbent assay (ELISA) revealed that 193CFRQKSQPDI202 motif was the minimal fragment recognized by 5D3, so this motif represented a linear B-cell epitope of ALV-p27. Homology analysis indicated that 5D3 defined epitope is highly conserved among ALV strains. The identified epitope might be useful in clinical applications and as a tool for further study of the structure and function of ALV-p27.
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Affiliation(s)
- Wiaam O A Khairy
- Ministry of Education Key Laboratory for Avian Preventive Medicine, Yangzhou University, Yangzhou, Jiangsu Province, China; Key Laboratory of Jiangsu Preventive Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu Province, China; Department of Microbiology, Faculty of Veterinary Medicine, University of Khartoum, Khartoum North 13314, Sudan.
| | - Lin Wang
- Ministry of Education Key Laboratory for Avian Preventive Medicine, Yangzhou University, Yangzhou, Jiangsu Province, China; Key Laboratory of Jiangsu Preventive Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu Province, China.
| | - Xue Tian
- Ministry of Education Key Laboratory for Avian Preventive Medicine, Yangzhou University, Yangzhou, Jiangsu Province, China; Key Laboratory of Jiangsu Preventive Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu Province, China.
| | - Jianqiang Ye
- Ministry of Education Key Laboratory for Avian Preventive Medicine, Yangzhou University, Yangzhou, Jiangsu Province, China; Key Laboratory of Jiangsu Preventive Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu Province, China; Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou University, Yangzhou, Jiangsu Province, China.
| | - Kun Qian
- Ministry of Education Key Laboratory for Avian Preventive Medicine, Yangzhou University, Yangzhou, Jiangsu Province, China; Key Laboratory of Jiangsu Preventive Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu Province, China; Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou University, Yangzhou, Jiangsu Province, China.
| | - Hongxia Shao
- Ministry of Education Key Laboratory for Avian Preventive Medicine, Yangzhou University, Yangzhou, Jiangsu Province, China; Key Laboratory of Jiangsu Preventive Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu Province, China; Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou University, Yangzhou, Jiangsu Province, China.
| | - Aijian Qin
- Ministry of Education Key Laboratory for Avian Preventive Medicine, Yangzhou University, Yangzhou, Jiangsu Province, China; Key Laboratory of Jiangsu Preventive Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu Province, China; Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou University, Yangzhou, Jiangsu Province, China.
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20
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Identification of a linear B-cell epitope on the avian leukosis virus P27 protein using monoclonal antibodies. Arch Virol 2016; 161:2871-7. [PMID: 27438076 DOI: 10.1007/s00705-016-2971-z] [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] [Received: 03/25/2016] [Accepted: 07/04/2016] [Indexed: 10/21/2022]
Abstract
Avian leukosis virus (ALV) is an avian oncogenic retrovirus that can induce various clinical tumors. The capsid protein P27 is the group-specific antigen of ALV and has many viral antigen sites that are easy to detect. In this study, we produced a monoclonal antibody (mAb), 3A9, that is specific for the P27 protein. A series of partially overlapping peptides were screened to define (181)PPSAR(185) as the minimal linear epitope recognized by mAb 3A9. The identified epitope could be recognized by chicken anti-ALV and mouse anti-ALV P27 sera. The epitope was highly conserved among a number of ALV-A, ALV-B and ALV-J strains. MAb 3A9 might be a valuable tool for the development of new immunodiagnostic approaches for ALV, and the defined linear epitope might help further our understanding of the antigenic structure of the P27 protein.
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21
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Liao SC, Peng J, Mauk MG, Awasthi S, Song J, Friedman H, Bau HH, Liu C. Smart Cup: A Minimally-Instrumented, Smartphone-Based Point-of-Care Molecular Diagnostic Device. SENSORS AND ACTUATORS. B, CHEMICAL 2016; 229:232-238. [PMID: 26900258 PMCID: PMC4756427 DOI: 10.1016/j.snb.2016.01.073] [Citation(s) in RCA: 117] [Impact Index Per Article: 14.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
Nucleic acid amplification-based diagnostics offer rapid, sensitive, and specific means for detecting and monitoring the progression of infectious diseases. However, this method typically requires extensive sample preparation, expensive instruments, and trained personnel. All of which hinder its use in resource-limited settings, where many infectious diseases are endemic. Here, we report on a simple, inexpensive, minimally-instrumented, smart cup platform for rapid, quantitative molecular diagnostics of pathogens at the point of care. Our smart cup takes advantage of water-triggered, exothermic chemical reaction to supply heat for the nucleic acid-based, isothermal amplification. The amplification temperature is regulated with a phase-change material (PCM). The PCM maintains the amplification reactor at a constant temperature, typically, 60-65°C, when ambient temperatures range from 12 to 35°C. To eliminate the need for an optical detector and minimize cost, we use the smartphone's flashlight to excite the fluorescent dye and the phone camera to record real-time fluorescence emission during the amplification process. The smartphone can concurrently monitor multiple amplification reactors and analyze the recorded data. Our smart cup's utility was demonstrated by amplifying and quantifying herpes simplex virus type 2 (HSV-2) with LAMP assay in our custom-made microfluidic diagnostic chip. We have consistently detected as few as 100 copies of HSV-2 viral DNA per sample. Our system does not require any lab facilities and is suitable for use at home, in the field, and in the clinic, as well as in resource-poor settings, where access to sophisticated laboratories is impractical, unaffordable, or nonexistent.
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Affiliation(s)
- Shih-Chuan Liao
- Department of Mechanical Engineering and Applied Mechanics, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
- Department of Biomechatronics Engineering, National Pingtung University of Science and Technology, Pingtung 912, Taiwan, ROC
| | - Jing Peng
- Department of Mechanical Engineering and Applied Mechanics, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
| | - Michael G. Mauk
- Department of Mechanical Engineering and Applied Mechanics, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
| | - Sita Awasthi
- Infectious Diseases Division, Department of Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
| | - Jinzhao Song
- Department of Mechanical Engineering and Applied Mechanics, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
| | - Harvey Friedman
- Infectious Diseases Division, Department of Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
| | - Haim H. Bau
- Department of Mechanical Engineering and Applied Mechanics, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
| | - Changchun Liu
- Department of Mechanical Engineering and Applied Mechanics, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
- Corresponding author: Dr. Changchun Liu, Department of Mechanical Engineering and Applied Mechanics, University of Pennsylvania, 216 Towne Building, 220 South 33 St., Philadelphia, Pennsylvania 19104-6315, USA, Phone: (215)898-1380,
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Peng H, Qin L, Bi Y, Wang P, Zou G, Li J, Yang Y, Zhong X, Wei P. Rapid detection of the common avian leukosis virus subgroups by real-time loop-mediated isothermal amplification. Virol J 2015; 12:195. [PMID: 26596553 PMCID: PMC4657318 DOI: 10.1186/s12985-015-0430-1] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2015] [Accepted: 11/17/2015] [Indexed: 11/16/2022] Open
Abstract
Background Subgroups A, B, E and J are the major subgroups of avian leukosis virus (ALV) infecting chickens. ALV infection has become endemic in China and has a significant negative effect on the poultry industry. Consequently, there is an urgent need for a specific, sensitive and rapid method for diagnosis and eradication of ALV. Therefore, we developed a simple and rapid real-time loop-mediated isothermal amplification (LAMP) reaction for the timely detection of the common ALV subgroups, whereby the amplification can be obtained in 35 min under isothermal conditions at 63 °C, ability to specific, sensitive and rapid detect all the common ALV subgroups. Methods A set of four specific primers was designed to target the sequences of the pol gene of ALV, and the loop-mediated isothermal amplification (LAMP) assay were developed and compared with PCR and virus isolation methods. Results The results from specificity of the LAMP assay showed that only target ALVs DNA was amplified. The LAMP assay demonstrated a sensitivity of 20 copies/reaction of ALV DNA, which was 10 times higher than the conventional PCR measurement. To further evaluate the reliability of the method, the assay was evaluated with ALV DNA from a panel of 81 clinical samples suspected of ALV infection. The results verify that the LAMP method was more sensitive than the conventional PCR and virus isolation method. Conclusion In conclusion, the developed LAMP assay was a simple, inexpensive, sensitive method for the rapid detection of the most common subgroups of ALV, and it provided a useful and practical tool in the eradication program for ALV in the poultry industry.
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Affiliation(s)
- Hao Peng
- Institute for Poultry Science and Health, Guangxi University, Nanning, 530004, China. .,Guangxi Key Laboratory of Animal Vaccines and Diagnostics, Guangxi Veterinary Research Institute, 51 Youai Bei Road, Nanning, 530001, China.
| | - Lili Qin
- Institute for Poultry Science and Health, Guangxi University, Nanning, 530004, China.
| | - Yuyu Bi
- Institute for Poultry Science and Health, Guangxi University, Nanning, 530004, China.
| | - Peikun Wang
- Institute for Poultry Science and Health, Guangxi University, Nanning, 530004, China.
| | - Guangzhen Zou
- Institute for Poultry Science and Health, Guangxi University, Nanning, 530004, China.
| | - Jun Li
- Guangxi Key Laboratory of Animal Vaccines and Diagnostics, Guangxi Veterinary Research Institute, 51 Youai Bei Road, Nanning, 530001, China.
| | - Yongli Yang
- Institute for Poultry Science and Health, Guangxi University, Nanning, 530004, China.
| | - Xingfu Zhong
- Institute for Poultry Science and Health, Guangxi University, Nanning, 530004, China.
| | - Ping Wei
- Institute for Poultry Science and Health, Guangxi University, Nanning, 530004, China.
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Dai M, Feng M, Liu D, Cao W, Liao M. Development and application of SYBR Green I real-time PCR assay for the separate detection of subgroup J Avian leukosis virus and multiplex detection of avian leukosis virus subgroups A and B. Virol J 2015; 12:52. [PMID: 25889925 PMCID: PMC4403717 DOI: 10.1186/s12985-015-0291-7] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2014] [Accepted: 03/30/2015] [Indexed: 11/10/2022] Open
Abstract
Background Subgroup A, B, and J ALVs are the most prevalent avian leukosis virus (ALV). Our study attempted to develop two SYBR Green I-based real-time PCR (RT-PCR) assays for specific detection of ALV subgroup J (ALV-J) and multiplex detection of ALV subgroups A and B (ALV-A/B), respectively. Results The two assays showed high specificity for ALV-J and ALV-A/B and the sensitivity of the two assays was at least 100 times higher than that of the routine PCR assay. The minimum virus detection limit of virus culture, routine PCR and real-time PCR for detection of ALV-A strain was 103 TCID50 units, 102 TCID50 units and fewer than 10 TCID50 units, respectively. In addition, the coefficients of variation for intra- and inter-assay were both less than 5%. Forty clinical plasma samples were evaluated by real-time PCR, routine PCR, and virus culture with positive rates of 80% (32/40), 72.5% (29/40) and 62.5% (25/40), respectively. When the assay for detection of ALV-J was used to quantify the viral load of various organ tissues in chicken inoculated by ALV-J strains CHN06 and NX0101, the results exhibited that ALV-J genes could be detected in all organ tissues examined and the highest copies of ALV-J were mainly in heart and kidney samples at 30 weeks post-infection. Except in lung, the virus copies of CHN06 group were higher than that of NX0101 group in various organ tissues. Conclusions The SYBR Green I-based real-time RT-PCR assay provides a powerful tool for the detection of ALV and study of virus replication and infection.
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Affiliation(s)
- Manman Dai
- College of Veterinary Medicine, South China Agricultural University, Guangzhou, People's Republic of China. .,Key Laboratory of Veterinary Vaccine Innovation of the Ministry of Agriculture, Guangzhou, People's Republic of China.
| | - Min Feng
- College of Animal Science, South China Agricultural University, Guangzhou, People's Republic of China.
| | - Di Liu
- College of Veterinary Medicine, South China Agricultural University, Guangzhou, People's Republic of China. .,Key Laboratory of Veterinary Vaccine Innovation of the Ministry of Agriculture, Guangzhou, People's Republic of China.
| | - Weisheng Cao
- College of Veterinary Medicine, South China Agricultural University, Guangzhou, People's Republic of China. .,Key Laboratory of Veterinary Vaccine Innovation of the Ministry of Agriculture, Guangzhou, People's Republic of China.
| | - Ming Liao
- Key Laboratory of Veterinary Vaccine Innovation of the Ministry of Agriculture, Guangzhou, People's Republic of China.
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24
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Identification of a novel B-cell epitope specific for avian leukosis virus subgroup J gp85 protein. Arch Virol 2015; 160:995-1004. [PMID: 25655260 DOI: 10.1007/s00705-014-2318-6] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2014] [Accepted: 12/14/2014] [Indexed: 10/24/2022]
Abstract
Avian leukosis virus subgroup J (ALV-J) is an avian oncogenic retrovirus that has caused severe economic losses in China. Gp85 protein is the main envelope protein and the most variable structural protein of ALV-J. It is also involved in virus neutralization. In this study, a specific monoclonal antibody, 4A3, was produced against the ALV-J gp85 protein. Immunofluorescence assays showed that 4A3 could react with different strains of ALV-J, including the British prototype isolate HPRS103, the American strains, an early Chinese broiler isolate, and layer isolates. A linear epitope on the gp85 protein was identified using a series of partially overlapping fragments spanning the gp85-encoding gene and subjecting them to western blot analysis. The results indicated that (134)AEAELRDFI(142) was the minimal linear epitope that could be recognized by mAb 4A3. Enzyme-linked immunosorbent assay (ELISA) revealed that chicken anti-ALV-J sera and mouse anti-ALV-J gp85 sera could also recognize the minimal linear epitope. Alignment analysis of amino acid sequences indicated that the epitope was highly conserved among 34 ALV-J strains. Furthermore, the epitope was not conserved among subgroup A and B of avian leukosis virus (ALV). Taken together, the mAb and the identified epitope may provide valuable tools for the development of new diagnostic methods for ALV-J.
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25
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Nyan DC, Ulitzky LE, Cehan N, Williamson P, Winkelman V, Rios M, Taylor DR. Rapid detection of hepatitis B virus in blood plasma by a specific and sensitive loop-mediated isothermal amplification assay. Clin Infect Dis 2014; 59:16-23. [PMID: 24704724 PMCID: PMC4305128 DOI: 10.1093/cid/ciu210] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2013] [Accepted: 03/25/2014] [Indexed: 01/05/2023] Open
Abstract
BACKGROUND Hepatitis B virus (HBV) is an important blood-borne pathogen that causes hepatic inflammation and can lead to liver cirrhosis and hepatocellular carcinoma. Conventional methods of HBV detection are time consuming and require highly trained personnel and elaborate equipment. This report describes the development of a rapid, simple, specific, and sensitive loop-mediated isothermal amplification assay (LAMP) for detection of HBV genotypes A, B, C, D, E, and F in blood samples. METHODS HBV standard plasma panels and clinical donor plasma specimens were used for the development and validation of the LAMP assay. Amplification was performed at 60°C for 60 minutes using extracted DNA or heat-treated plasma specimens without DNA extraction. The assay was evaluated for its ability to detect various HBV genotypes and for its sensitivity, specificity, and time-point of detection. RESULTS The LAMP assay detected HBV genotypes A-F and demonstrated a sensitivity of 10-100 IU per reaction of HBV DNA. The assay also detected 69 of 75 (92%) HBV-positive donor plasma specimens tested and demonstrated a specificity of 100%. CONCLUSIONS These results demonstrate that our HBV-LAMP assay is rapid, sensitive and specific, and capable of detecting the major HBV genotypes. This assay could be used in clinical point-of-care settings, mainly in endemic and resource-limited environments for HBV diagnostics, donor screening, epidemiological studies, and therapeutic monitoring of patients undergoing antiviral treatment.
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Affiliation(s)
- Dougbeh-Chris Nyan
- Laboratory of Emerging Pathogens, Office of Blood Research and Review, Division of Emerging and Transfusion-Transmitted Diseases, Center for Biologics Evaluation and Research, US Food and Drug Administration, Bethesda, Maryland
| | - Laura E. Ulitzky
- Laboratory of Emerging Pathogens, Office of Blood Research and Review, Division of Emerging and Transfusion-Transmitted Diseases, Center for Biologics Evaluation and Research, US Food and Drug Administration, Bethesda, Maryland
| | - Nicoleta Cehan
- Laboratory of Emerging Pathogens, Office of Blood Research and Review, Division of Emerging and Transfusion-Transmitted Diseases, Center for Biologics Evaluation and Research, US Food and Drug Administration, Bethesda, Maryland
| | | | | | - Maria Rios
- Laboratory of Emerging Pathogens, Office of Blood Research and Review, Division of Emerging and Transfusion-Transmitted Diseases, Center for Biologics Evaluation and Research, US Food and Drug Administration, Bethesda, Maryland
| | - Deborah R. Taylor
- Laboratory of Emerging Pathogens, Office of Blood Research and Review, Division of Emerging and Transfusion-Transmitted Diseases, Center for Biologics Evaluation and Research, US Food and Drug Administration, Bethesda, Maryland
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Effective signal-on photoelectrochemical immunoassay of subgroup J avian leukosis virus based on Bi2S3 nanorods as photosensitizer and in situ generated ascorbic acid for electron donating. Biosens Bioelectron 2014; 54:237-43. [DOI: 10.1016/j.bios.2013.11.021] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2013] [Revised: 10/29/2013] [Accepted: 11/06/2013] [Indexed: 01/13/2023]
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Ming H, Wang M, Zhang X, Yin H. Determination of Subgroup J Avian Leukosis Virus by Surface Plasmon Resonance Immunosensor. ANAL LETT 2014. [DOI: 10.1080/00032719.2013.858259] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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28
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Yin H, Wang M, Zhou Y, Zhang X, Sun B, Wang G, Ai S. Photoelectrochemical biosensing platform for microRNA detection based on in situ producing electron donor from apoferritin-encapsulated ascorbic acid. Biosens Bioelectron 2014; 53:175-81. [DOI: 10.1016/j.bios.2013.09.053] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2013] [Revised: 09/24/2013] [Accepted: 09/24/2013] [Indexed: 12/28/2022]
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Liu X, Li Y, Xu C, Qin J, Hao J, Feng M, Tan L, Jia W, Liao M, Cao W. Real-time fluorescence loop-mediated isothermal amplification for the diagnosis of hemorrhagic enteritis virus. Virus Res 2014; 183:50-5. [PMID: 24487182 DOI: 10.1016/j.virusres.2014.01.023] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2013] [Revised: 01/21/2014] [Accepted: 01/22/2014] [Indexed: 10/25/2022]
Abstract
Suspected cases of hemorrhagic enteritis associated with hemorrhagic enteritis virus (HEV) are becoming more frequent among yellow chickens in the Guangdong Province of China. In this study, we have developed a one-step, ecumenical, real-time fluorescence loop-mediated isothermal amplification (RealAmp) assay for the rapid diagnosis of HEV. The RealAmp assay was performed at 63°C and reduced the assay time to 15min, using a simple and portable device, the ESE-Quant Tube Scanner. The detection limit of DNA was 1fg/μl, and the detection was specific only to HEV. We also used nested PCR to evaluate the application of the RealAmp assay. The coincidence rate of the two methods was 100%. Our data indicated that the RealAmp assay provides a sensitive, specific, and user-friendly diagnostic tool for the identification and quantification of HEV for field diagnosis and in laboratory research.
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Affiliation(s)
- Xuemei Liu
- Key Laboratory of Veterinary Vaccine Innovation of the Ministry of Agriculture, College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, The People's Republic of China
| | - Yuhao Li
- Key Laboratory of Veterinary Vaccine Innovation of the Ministry of Agriculture, College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, The People's Republic of China
| | - Chenggang Xu
- Key Laboratory of Veterinary Vaccine Innovation of the Ministry of Agriculture, College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, The People's Republic of China
| | - Jianru Qin
- Key Laboratory of Veterinary Vaccine Innovation of the Ministry of Agriculture, College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, The People's Republic of China
| | - Jianyong Hao
- Key Laboratory of Veterinary Vaccine Innovation of the Ministry of Agriculture, College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, The People's Republic of China
| | - Min Feng
- Key Laboratory of Veterinary Vaccine Innovation of the Ministry of Agriculture, College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, The People's Republic of China
| | - Liqiang Tan
- Key Laboratory of Veterinary Vaccine Innovation of the Ministry of Agriculture, College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, The People's Republic of China
| | - Weixin Jia
- Key Laboratory of Veterinary Vaccine Innovation of the Ministry of Agriculture, College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, The People's Republic of China
| | - Ming Liao
- Key Laboratory of Veterinary Vaccine Innovation of the Ministry of Agriculture, College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, The People's Republic of China
| | - Weisheng Cao
- Key Laboratory of Veterinary Vaccine Innovation of the Ministry of Agriculture, College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, The People's Republic of China.
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Li C, Chen Z, Meng C, Liu G. Rapid detection of duck hepatitis A virus genotype C using reverse transcription loop-mediated isothermal amplification. J Virol Methods 2013; 196:193-8. [PMID: 24291148 DOI: 10.1016/j.jviromet.2013.11.009] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2013] [Revised: 11/13/2013] [Accepted: 11/19/2013] [Indexed: 01/20/2023]
Abstract
A one-step reverse transcription loop-mediated isothermal amplification (RT-LAMP) assay was used and optimized to develop a rapid and sensitive detection system for duck hepatitis A virus genotype C (DHAV-C) RNA. A set of four specific primers was designed against highly conserved sequences located within the 3D gene from DHAV (strain GX1201). Under optimal reaction conditions, the sensitivity of DHAV-C-specific RT-LAMP was 100-fold higher than that of reverse transcriptase-polymerase chain reaction (RT-PCR), with a detection limit of 0.3pg (6.59×10(4) copies) per reaction. No cross-reactivity was observed from the samples of other duck viruses, which is in good accordance with RT-PCR. Furthermore, a positive reaction can be visually inspected by observing turbidity or color change after the addition of SYBR green I dye. The DHAV-C-specific RT-LAMP assay was applied to the samples and compared with RT-PCR. The positive-sample ratios were 26.7% (12 of 45) by RT-LAMP and 20% (9 of 45) by RT-PCR. Therefore, the newly developed RT-LAMP assay is a rapid, specific, sensitive, and cost-effective method of DHAV-C detection. This assay has potential applications in both clinical diagnosis and field surveillance of DHAV-C infection.
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Affiliation(s)
- Chuanfeng Li
- Division of Avian Infectious Diseases, Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai 200241, China
| | - Zongyan Chen
- Division of Avian Infectious Diseases, Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai 200241, China
| | - Chunchun Meng
- Division of Avian Infectious Diseases, Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai 200241, China
| | - Guangqing Liu
- Division of Avian Infectious Diseases, Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai 200241, China.
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Development and application of a multiplex PCR method for rapid differential detection of subgroup A, B, and J avian leukosis viruses. J Clin Microbiol 2013; 52:37-44. [PMID: 24131697 DOI: 10.1128/jcm.02200-13] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Avian leukosis virus (ALV) subgroups A, B, and J are very common in poultry flocks and have caused serious economic losses in recent years. A multiplex PCR (mPCR) method for the detection of these three subgroups was developed and optimized in this study. We first designed a common forward primer, PF, and three downstream primers, AR, BR, and JR, which can amplify 715 bp for subgroup A, 515 bp for subgroup B, and 422 bp for subgroup J simultaneously in one reaction. The mPCR method produced neither cross-reactions with other subgroups of ALVs nor nonspecific reactions with other common avian viruses. The detection limit of the mPCR was as low as 1 × 10(3) viral DNA copies of each of the three subgroups. In animal experiments, the mPCR detected ALVs 2 to 4 days earlier than did virus isolation from whole-blood samples and cloaca swabs. Furthermore, a total of 346 clinical samples (including 127 tissue samples, 86 cloaca swabs, 59 albumen samples, and 74 whole-blood samples) from poultry flocks with suspected ALV infection were examined by mPCR, routine PCR, and virus isolation. The positive sample/total sample ratios for ALV-A, ALV-B, and ALV-J were 48% (166/346) as detected by mPCR and 48% (166/346) as detected by routine PCR. However, the positive sample/total sample ratio detected by virus isolation was 40% (138/346). The results of the mPCR and routine PCR were confirmed by sequencing the specific fragments. These results indicate that the mPCR method is rapid, specific, sensitive, and convenient for use in epidemiological studies of ALV, clinical detection of ALV, and ALV eradication programs.
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Qiu Y, Li X, Fu L, Cui Z, Li W, Wu Z, Sun S. Development and characterization of monoclonal antibodies to subgroup A avian leukosis virus. Vet Comp Oncol 2013; 12:47-51. [DOI: 10.1111/vco.12036] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2012] [Revised: 03/08/2013] [Accepted: 03/16/2013] [Indexed: 11/29/2022]
Affiliation(s)
- Y. Qiu
- College of Basic Medicine; Taishan Medical University; Tai'an China
| | - X. Li
- College of Basic Medicine; Taishan Medical University; Tai'an China
| | - L. Fu
- Department of Respiratory; Xintai People Hospital; Xintai China
| | - Z. Cui
- College of Animal Science and Veterinary Medicine; Shandong Agricultural University; Tai'an China
| | - W. Li
- Department of Animal Health Evaluation, China Animal Health and Epidemiology Center; Qingdao China
| | - Z. Wu
- College of Animal Science and Veterinary Medicine; Shandong Agricultural University; Tai'an China
| | - S. Sun
- College of Animal Science and Veterinary Medicine; Shandong Agricultural University; Tai'an China
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Yang JL, Zhang SH, Liu ZH, Yang R, Huang Y, Wen M. Development and evaluation of a loop-mediated isothermal amplification assay for the rapid detection of porcine cytomegalovirus under field conditions. Virol J 2012; 9:321. [PMID: 23272902 PMCID: PMC3552788 DOI: 10.1186/1743-422x-9-321] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2012] [Accepted: 12/21/2012] [Indexed: 11/15/2022] Open
Abstract
Background Porcine cytomegalovirus (PCMV) induces silent infection in adult pigs but more frequently causes fatal, generalized infection in newborn piglets. This study aimed to develop a new loop-mediated isothermal amplification (LAMP) method for the sensitive, rapid, and inexpensive detection of PCMV under field conditions. Methods Tissue obtained from nine-week-old PCMV-free Landrace pigs or pig samples from postmortem examinations were analyzed. The samples were found to have clinical signs and lesions consistent with inclusion body rhinitis. Six specific primers were designed by targeting the PCMV DNA polymerase (DPOL) DNA. The LAMP reaction was optimized in a water bath. The sensitivity and specificity of LAMP and polymerase chain reaction (PCR) were compared. Results PCMV DNA was amplified at 65°C, and the result could be detected as early as 30 min into the reaction. Positive reactions could be visualized by the naked eye as a color change brought on by the addition of SYBR Green. The sensitivity and specificity of LAMP were found to be similar to those of the PCR. Conclusions LAMP is a high-throughput technique for the detection of PCMV and has a high specificity, sensitivity and simplicity; these factors make it suitable for detection of PCMV under field conditions.
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Affiliation(s)
- Jin-Long Yang
- Animal Science College of Guizhou University, Guiyang, Guizhou, China.
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Yang L, Li J, Bi Y, Xu L, Liu W. Development and application of a reverse transcription loop-mediated isothermal amplification method for rapid detection of Duck hepatitis A virus type 1. Virus Genes 2012; 45:585-9. [PMID: 22869367 PMCID: PMC7088793 DOI: 10.1007/s11262-012-0798-6] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2012] [Accepted: 07/21/2012] [Indexed: 11/25/2022]
Abstract
We developed and evaluated a reverse transcription loop-mediated isothermal amplification (RT-LAMP) assay for detecting Duck hepatitis A virus type 1 (DHAV-1). The amplification could be finished in 1 h under isothermal conditions at 63 °C by employing a set of four primers targeting the 2C gene of DHAV-1. The RT-LAMP assay showed higher sensitivity than the RT-PCR with a detection limit of 0.1 ELD(50) 0.1 ml(-1) of DHAV-1. The RT-LAMP assay was highly specific; no cross-reactivity was observed from the samples of other related viruses, bacteria, allantoic fluid of normal chicken embryos, or the livers of uninfected ducks. Thirty clinical samples were subjected to detection by RT-LAMP, RT-PCR, and virus isolation, which obtained completely consistent, positive results. As a simple, rapid, and accurate detection method, this RT-LAMP assay has important potential applications in the clinical diagnosis of DHAV-1.
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Affiliation(s)
- Limin Yang
- CAS Key Laboratory of Pathogenic Microbiology and Immunology, Institute of Microbiology, Chinese Academy of Sciences, Beijing, China
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35
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Wang J, Cheng S, Yi L, Cheng Y, Yang S, Xu H, Li Z, Shi X, Wu H, Yan X. Detection of mink enteritis virus by loop-mediated isothermal amplification (LAMP). J Virol Methods 2012. [PMID: 23183142 DOI: 10.1016/j.jviromet.2012.11.012] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Loop-mediated isothermal amplification (LAMP) method was discovered in the last decade but only used for the first time in the diagnosis of mink enteritis virus (MEV) infection in this study. The amplification could be completed within 60 min, under isothermal condition at 65°C, by employing a set of four primers targeting the VP2 gene of MEV. The LAMP was more sensitive than the conventional PCR, with a detection limit of 10(-1) median tissue culture infective doses (TCID(50))/ml per reaction, compared with 10 TCID(50)/ml for PCR analysis. No cross reactivity was observed for other related viruses, including canine distemper virus (CDV) and Aleutian mink disease parvovirus (AMDV). Eighty four of 230 clinical samples were found to be positive for MEV, which is higher than that determined by using the conventional PCR method (68). The results indicate the LAMP can be potentially used to determine MEV as a simple, rapid procedure. This assay would be an available alternative to PCR analysis for the diagnosis of MEV infection in mink, particularly in less well-equipped laboratories and in rural settings where resources are limited.
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Affiliation(s)
- Jianke Wang
- State Key Laboratory for Molecular Biology of Special Economic Animals, Institute of Special Economic Animal and Plant Sciences, Chinese Academy of Agricultural Sciences, Changchun 130112, China
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36
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Development and application of real-time PCR for detection of subgroup J avian leukosis virus. J Clin Microbiol 2012; 51:149-54. [PMID: 23100340 DOI: 10.1128/jcm.02030-12] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Subgroup J avian leukosis virus (ALV-J) is an avian retrovirus that causes severe economic losses in the poultry industry. The early identification and removal of virus-shedding birds are important to reduce the spread of congenital and contact infections. In this study, a TaqMan-based real-time PCR method for the rapid detection and quantification of ALV-J with proviral DNA was developed. This method exhibited a high specificity for ALV-J. Moreover, the detection limit was as low as 10 viral DNA copies. The coefficients of variation (CVs) of both interassay and intra-assay reproducibility were less than 1%. The growth curves of ALV-J in DF-1 cells were measured by real-time PCR, yielding a trend line similar to those determined by 50% tissue culture infective dose (TCID(50)) and p27 antigen detection. Tissue samples suspected of ALV infection were evaluated using real-time PCR, virus isolation, and routine PCR, and the positivity rates were 60.1%, 41.6% and 44.5%, respectively. Our data indicated that the real-time PCR method provides a sensitive, specific, and reproducible diagnostic tool for the identification and quantification of ALV-J for clinical diagnosis and in laboratory research.
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37
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Gansen A, Herrick AM, Dimov IK, Lee LP, Chiu DT. Digital LAMP in a sample self-digitization (SD) chip. LAB ON A CHIP 2012; 12:2247-54. [PMID: 22399016 PMCID: PMC3383853 DOI: 10.1039/c2lc21247a] [Citation(s) in RCA: 144] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
This paper describes the realization of digital loop-mediated DNA amplification (dLAMP) in a sample self-digitization (SD) chip. Digital DNA amplification has become an attractive technique to quantify absolute concentrations of DNA in a sample. While digital polymerase chain reaction is still the most widespread implementation, its use in resource-limited settings is impeded by the need for thermal cycling and robust temperature control. In such situations, isothermal protocols that can amplify DNA or RNA without thermal cycling are of great interest. Here, we accomplished the successful amplification of single DNA molecules in a stationary droplet array using isothermal digital loop-mediated DNA amplification. Unlike most (if not all) existing methods for sample discretization, our design allows for automated, loss-less digitization of sample volumes on-chip. We demonstrated accurate quantification of relative and absolute DNA concentrations with sample volumes of less than 2 μl. We assessed the homogeneity of droplet size during sample self-digitization in our device, and verified that the size variation was small enough such that straightforward counting of LAMP-active droplets sufficed for data analysis. We anticipate that the simplicity and robustness of our SD chip make it attractive as an inexpensive and easy-to-operate device for DNA amplification, for example in point-of-care settings.
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Affiliation(s)
- Alexander Gansen
- Department of Chemistry, University of Washington, Seattle, USA., Fax:+1-206-685-8665; Tel: +1-206-543-1665
| | - Alison M. Herrick
- Department of Chemistry, University of Washington, Seattle, USA., Fax:+1-206-685-8665; Tel: +1-206-543-1665
| | - Ivan K. Dimov
- Berkeley Sensor and Actuator Center, Department of Bioengineering, University of California, Berkeley, USA; Tel: +1-510-642-5855
| | - Luke P. Lee
- Berkeley Sensor and Actuator Center, Department of Bioengineering, University of California, Berkeley, USA; Tel: +1-510-642-5855
| | - Daniel T. Chiu
- Department of Chemistry, University of Washington, Seattle, USA., Fax:+1-206-685-8665; Tel: +1-206-543-1665
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