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Wang H, Ye C, Lu Q, Jiang Z, Jiang C, Zhou C, Li N, Zhang C, Zhao G, Yue M, Li Y. Bacterial exonuclease III expands its enzymatic activities on single-stranded DNA. eLife 2024; 13:RP95648. [PMID: 38959062 PMCID: PMC11221836 DOI: 10.7554/elife.95648] [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] [Indexed: 07/04/2024] Open
Abstract
Bacterial exonuclease III (ExoIII), widely acknowledged for specifically targeting double-stranded DNA (dsDNA), has been documented as a DNA repair-associated nuclease with apurinic/apyrimidinic (AP)-endonuclease and 3'→5' exonuclease activities. Due to these enzymatic properties, ExoIII has been broadly applied in molecular biosensors. Here, we demonstrate that ExoIII (Escherichia coli) possesses highly active enzymatic activities on ssDNA. By using a range of ssDNA fluorescence-quenching reporters and fluorophore-labeled probes coupled with mass spectrometry analysis, we found ExoIII cleaved the ssDNA at 5'-bond of phosphodiester from 3' to 5' end by both exonuclease and endonuclease activities. Additional point mutation analysis identified the critical residues for the ssDNase action of ExoIII and suggested the activity shared the same active center with the dsDNA-targeted activities of ExoIII. Notably, ExoIII could also digest the dsDNA structures containing 3'-end ssDNA. Considering most ExoIII-assisted molecular biosensors require the involvement of single-stranded DNA (ssDNA) or nucleic acid aptamer containing ssDNA, the activity will lead to low efficiency or false positive outcome. Our study revealed the multi-enzymatic activity and the underlying molecular mechanism of ExoIII on ssDNA, illuminating novel insights for understanding its biological roles in DNA repair and the rational design of ExoIII-ssDNA involved diagnostics.
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Affiliation(s)
- Hao Wang
- Department of Veterinary Medicine, Zhejiang University College of Animal SciencesHangzhouChina
| | - Chen Ye
- Department of Veterinary Medicine, Zhejiang University College of Animal SciencesHangzhouChina
| | - Qi Lu
- Hainan Institute of Zhejiang UniversitySanyaChina
| | - Zhijie Jiang
- Department of Veterinary Medicine, Zhejiang University College of Animal SciencesHangzhouChina
| | - Chao Jiang
- Life Sciences Institute, Zhejiang University, HangzhouZhejiangChina
| | - Chun Zhou
- School of Public Health, and Department of Pathology of Sir Run Run Shaw Hospital, Zhejiang University School of MedicineHangzhouChina
| | - Na Li
- Department of Veterinary Medicine, Zhejiang University College of Animal SciencesHangzhouChina
| | - Caiqiao Zhang
- Department of Veterinary Medicine, Zhejiang University College of Animal SciencesHangzhouChina
| | - Guoping Zhao
- Key Laboratory of Systems Health Science of Zhejiang Province, School of Life Science, Hangzhou Institute for Advanced Study, University of Chinese Academy of SciencesHangzhouChina
- CAS Key Laboratory of Synthetic Biology, Institute of Plant Physiology and Ecology, Shanghai Institutes for Biological Sciences, Chinese Academy of SciencesShanghaiChina
- Department of Microbiology and Microbial Engineering, School of Life Sciences, Fudan UniversityShanghaiChina
| | - Min Yue
- Department of Veterinary Medicine, Zhejiang University College of Animal SciencesHangzhouChina
- Hainan Institute of Zhejiang UniversitySanyaChina
- Key Laboratory of Systems Health Science of Zhejiang Province, School of Life Science, Hangzhou Institute for Advanced Study, University of Chinese Academy of SciencesHangzhouChina
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, National Clinical Research Center for Infectious Diseases, National Medical Center for Infectious Diseases, The First Affiliated Hospital, College of Medicine, Zhejiang UniversityHangzhouChina
| | - Yan Li
- Department of Veterinary Medicine, Zhejiang University College of Animal SciencesHangzhouChina
- Hainan Institute of Zhejiang UniversitySanyaChina
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Zhou S, Yang Z, Guo B, Yi J, Pang Y, Feng R, Song J, Xiu Y. Rapid Visual Detection of Spiroplasma eriocheiris by Loop-Mediated Isothermal Amplification with Hydroxynaphthol Blue Dye. MARINE BIOTECHNOLOGY (NEW YORK, N.Y.) 2024; 26:116-124. [PMID: 38170295 DOI: 10.1007/s10126-023-10282-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/13/2023] [Accepted: 12/22/2023] [Indexed: 01/05/2024]
Abstract
In recent years, a new type of Spiroplasma has been found that can cause "tremor disease" of the Chinese mitten crab Eriocheir sinensis. The outbreak of epidemic tremor disease has caused a serious setback in the Chinese mitten crab farming industry, with an incidence rate of more than 30% and mortality rates of 80-100%. Therefore, finding a sensitive method to detect tremor disease in E. sinensis has become a current research focus. In this research, a loop-mediated isothermal amplification detection method coupled with hydroxynaphthol blue dye (LAMP-HNB) was developed and used to rapidly detect Spiroplasma eriocheiris. First, we designed and synthesized specific outer primers, inner primers and loop primers based on the 16S ribosomal RNA gene of S. eriocheiris. Second, the LAMP-HNB detection method for S. eriocheiris was successfully established by screening the primers, adjusting the temperature and time of the reaction, and optimizing the concentrations of Mg2+ and dNTPs. In the specific tests, only samples infected with S. eriocheiris showed positive results, and other infections caused by bacteria and parasites tested negative, proving that the test has high specificity. Moreover, the detection limit was 2.5 × 10-6 ng/µL, indicating high sensitivity. This method for detecting S. eriocheiris provides rapid visual output based on LAMP-HNB detection and is a simple, fast, sensitive, and inexpensive method that can be applied to a wide range of field investigations.
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Affiliation(s)
- Shun Zhou
- School of Marine Science and Engineering, Qingdao Agricultural University, Qingdao, 266109, China
| | - Zongrui Yang
- School of Marine Science and Engineering, Qingdao Agricultural University, Qingdao, 266109, China
| | - Baoshan Guo
- School of Marine Science and Engineering, Qingdao Agricultural University, Qingdao, 266109, China
| | - Jingyuan Yi
- School of Marine Science and Engineering, Qingdao Agricultural University, Qingdao, 266109, China
| | - Yunfei Pang
- School of Marine Science and Engineering, Qingdao Agricultural University, Qingdao, 266109, China
| | - Ruixin Feng
- School of Marine Science and Engineering, Qingdao Agricultural University, Qingdao, 266109, China
| | - Jiaxue Song
- School of Marine Science and Engineering, Qingdao Agricultural University, Qingdao, 266109, China
| | - Yunji Xiu
- School of Marine Science and Engineering, Qingdao Agricultural University, Qingdao, 266109, China.
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Yao Y, Luo N, Zong Y, Jia M, Rao Y, Huang H, Jiang H. Recombinase Polymerase Amplification Combined with Lateral Flow Dipstick Assay for the Rapid and Sensitive Detection of Pseudo-nitzschia multiseries. Int J Mol Sci 2024; 25:1350. [PMID: 38279350 PMCID: PMC10816074 DOI: 10.3390/ijms25021350] [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: 11/23/2023] [Revised: 01/03/2024] [Accepted: 01/19/2024] [Indexed: 01/28/2024] Open
Abstract
The harmful algal bloom (HAB) species Pseudo-nitzschia multiseries is widely distributed worldwide and is known to produce the neurotoxin domoic acid, which harms marine wildlife and humans. Early detection and preventative measures are more critical than late management. However, the major challenge related to early detection is the accurate and sensitive detection of microalgae present in low abundance. Therefore, developing a sensitive and specific method that can rapidly detect P. multiseries is critical for expediting the monitoring and prediction of HABs. In this study, a novel assay method, recombinase polymerase amplification combined with lateral flow dipstick (RPA-LFD), is first developed for the detection of P. multiseries. To obtain the best test results, several important factors that affected the amplification effect were optimized. The internal transcribed spacer sequence of the nuclear ribosomal DNA from P. multiseries was selected as the target region. The results showed that the optimal amplification temperature and time for the recombinase polymerase amplification (RPA) of P. multiseries were 37 °C and 15 min. The RPA products could be visualized directly using the lateral flow dipstick after only 3 min. The RPA-LFD assay sensitivity for detection of recombinant plasmid DNA (1.9 × 100 pg/μL) was 100 times more sensitive than that of RPA, and the RPA-LFD assay sensitivity for detection of genomic DNA (2.0 × 102 pg/μL) was 10 times more sensitive than that of RPA. Its feasibility in the detection of environmental samples was also verified. In conclusion, these results indicated that the RPA-LFD detection of P. multiseries that was established in this study has high efficiency, sensitivity, specificity, and practicability. Management measures made based on information gained from early detection methods may be able to prevent certain blooms. The use of a highly sensitive approach for early warning detection of P. multiseries is essential to alleviate the harmful impacts of HABs on the environment, aquaculture, and human health.
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Affiliation(s)
- Yuqing Yao
- School of Marine Sciences, Ningbo University, Ningbo 315211, China; (Y.Y.); (N.L.); (Y.Z.); (M.J.); (Y.R.)
| | - Ningjian Luo
- School of Marine Sciences, Ningbo University, Ningbo 315211, China; (Y.Y.); (N.L.); (Y.Z.); (M.J.); (Y.R.)
| | - Yujie Zong
- School of Marine Sciences, Ningbo University, Ningbo 315211, China; (Y.Y.); (N.L.); (Y.Z.); (M.J.); (Y.R.)
| | - Meng Jia
- School of Marine Sciences, Ningbo University, Ningbo 315211, China; (Y.Y.); (N.L.); (Y.Z.); (M.J.); (Y.R.)
| | - Yichen Rao
- School of Marine Sciences, Ningbo University, Ningbo 315211, China; (Y.Y.); (N.L.); (Y.Z.); (M.J.); (Y.R.)
| | - Hailong Huang
- School of Marine Sciences, Ningbo University, Ningbo 315211, China; (Y.Y.); (N.L.); (Y.Z.); (M.J.); (Y.R.)
- Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai 519080, China
| | - Haibo Jiang
- School of Marine Sciences, Ningbo University, Ningbo 315211, China; (Y.Y.); (N.L.); (Y.Z.); (M.J.); (Y.R.)
- Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai 519080, China
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Chen B, Zhang H, Wang H, Li S, Zhou P. Development and application of a dual ERA method for the detection of Feline Calicivirus and Feline Herpesvirus Type I. Virol J 2023; 20:62. [PMID: 37020252 PMCID: PMC10077619 DOI: 10.1186/s12985-023-02020-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2023] [Accepted: 03/23/2023] [Indexed: 04/07/2023] Open
Abstract
Feline calicivirus (FCV) and feline herpesvirus type I (FHV-1) are the most common viral pathogens responsible for cat respiratory diseases, and coinfection with these two pathogens is often found. In veterinary clinics, the main diagnostic methods for FCV and FHV-1 are test strips and polymerase chain reaction (PCR). However, the sensitivity of test strips are not sufficient, and PCR is time-consuming. Therefore, developing a rapid and high-performance clinical diagnostic test is imperative for the prevention and treatment of these diseases. Enzymatic recombinase amplification (ERA) is an automated isothermal nucleic acid amplification technique that maintains a constant temperature, and is both rapid and highly accurate. In this study, a dual ERA method was developed using the Exo probe for a differential detection of FCV and FHV-1. This dual ERA method demonstrated high performance with the detection limit of 101 copies for both viruses, and no cross-reactions with feline parvovirus virus and F81 cells. To test the utility of the method for clinical applications, 50 nasopharyngeal swabs from cats with respiratory symptoms were collected and tested. The positive rates of FCV and FHV-1 were 40% (20/50, 95% confidence interval [CI], 26.4 to 54.8%) and 14% (7/50, 95% CI, 5.8 to 26.7%), respectively. The rate of coinfection with FCV and FHV-1 was 10% (5/50, 95% CI, 3.3 to 21.8%). These results were in agreement with those found using quantitative real-time PCR. Therefore, this dual ERA method is a novel and efficient clinical diagnostic tool for FCV and FHV-1 detection.
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Affiliation(s)
- Bo Chen
- Guangdong Provincial Pet Engineering Technology Research Center, College of Veterinary Medicine, South China Agricultural University, Guangzhou, 510642, Guangdong Province, People's Republic of China
| | - Haoyang Zhang
- Guangdong Provincial Pet Engineering Technology Research Center, College of Veterinary Medicine, South China Agricultural University, Guangzhou, 510642, Guangdong Province, People's Republic of China
| | - Hanhong Wang
- Guangdong Provincial Pet Engineering Technology Research Center, College of Veterinary Medicine, South China Agricultural University, Guangzhou, 510642, Guangdong Province, People's Republic of China
| | - Shoujun Li
- Guangdong Provincial Pet Engineering Technology Research Center, College of Veterinary Medicine, South China Agricultural University, Guangzhou, 510642, Guangdong Province, People's Republic of China
| | - Pei Zhou
- Guangdong Provincial Pet Engineering Technology Research Center, College of Veterinary Medicine, South China Agricultural University, Guangzhou, 510642, Guangdong Province, People's Republic of China.
- College of Veterinary Medicine, South China Agricultural University, Guangzhou, 510642, Guangdong Province, People's Republic of China.
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Sensitive and rapid detection of Babesia species in dogs by recombinase polymerase amplification with lateral flow dipstick (RPA-LFD). Sci Rep 2022; 12:20560. [PMID: 36446883 PMCID: PMC9707278 DOI: 10.1038/s41598-022-25165-7] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2022] [Accepted: 11/25/2022] [Indexed: 11/30/2022] Open
Abstract
Canine babesiosis is a tick-borne disease caused by Babesia spp., which infects and destroys healthy erythrocytes, leading to mortality and morbidity in dogs. The diagnosis of babesiosis is tedious and time-consuming, especially in latent and chronic infections. Here, a recombinase polymerase amplification combined with a lateral flow dipstick (RPA-LFD) assay was developed for rapid and accurate detection of Babesia spp. in canine blood specimens based on the 18S rRNA region. The RPA-LFD assay using rpaBab264 gave specificity to Babesia spp. in dogs (B. vogeli and B. gibsoni) without cross-amplification to other parasites (apicomplexans and non-apicomplexans), with detection limit of at least 22.5 copies/μl (0.1 fg/µl) at 40 °C for at least 10 min. The whole process of DNA amplification by RPA and readout by LFD did not exceed 30 min. To determine the performance of the RPA-LFD assay, a total of 30 clinical samples was examined and compared with conventional PCR (cPCR) and multiplex HRM (mHRM). Eight dogs (26.67%) were detected as positive by RPA-LFD, while seven and six were found positive by cPCR and mHRM, respectively. RPA-LFD and cPCR showed high agreement with Babesia spp. detection with kappa > 0.9. We confirmed that the dogs were infected by B. vogeli from sequences of positive PCR results. Our findings suggested that RPA-LFD using the rpaBab264 assay offered a rapid, accurate, cost-effective and simple method for Babesia spp. detection that is feasibly applicable to be rapid kit at a pet hospital or point-of-care testing.
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