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Wang X, Deng X, Zhang Y, Dong W, Rao Q, Huang Q, Tang F, Shen R, Xu H, Jin Z, Tang Y, Du D. A rapid and sensitive one-pot platform integrating fluorogenic RNA aptamers and CRISPR- Cas13a for visual detection of monkeypox virus. Biosens Bioelectron 2024; 257:116268. [PMID: 38636316 DOI: 10.1016/j.bios.2024.116268] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2024] [Revised: 03/26/2024] [Accepted: 04/01/2024] [Indexed: 04/20/2024]
Abstract
The recent global upsurge in Monkeypox virus (MPXV) outbreaks underscores the critical need for rapid and precise diagnostic solutions, particularly in resource-constrained settings. The gold standard diagnostic method, qRT-PCR, is hindered by its time-consuming nature, requirement for nucleic acid purification, expensive equipment, and the need for highly trained personnel. Traditional CRISPR/Cas fluorescence assays, relying on trans-cleavage of ssDNA/RNA reporters labeled with costly fluorophores and quenchers, pose challenges that limit their widespread application, especially for point-of-care testing (POCT). In this study, we utilized a cost-effective and stable fluorogenic RNA aptamer (Mango III), specifically binding and illuminating the fluorophore TO3-3 PEG-Biotin Fluorophore (TO3), as a reporter for Cas13a trans-cleavage activity. We propose a comprehensive strategy integrating RNA aptamer, recombinase-aided amplification (RAA), and CRISPR-Cas13a systems for the molecular detection of MPXV target. Leveraging the inherent collateral cleavage properties of the Cas13a system, we established high-sensitivity and specificity assays to distinguish MPXV from other Orthopoxviruses (OPVs). A streamlined one-pot protocol was developed to mitigate aerosol contamination risks. Our aptamer-coupled RAA-Cas13a one-pot detection method achieved a Limit of Detection (LoD) of 4 copies of target MPXV DNA in just 40 min. Validation using clinical MPX specimens confirmed the rapid and reliable application of our RAA-Cas13a-Apt assays without nucleic acid purification procedure, highlighting its potential as a point-of-care testing solution. These results underscore the user-friendliness and effectiveness of our one-pot RAA-Cas13a-Apt diagnostic platform, poised to revolutionize disease detection and management.
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Affiliation(s)
- Xiao Wang
- State Key Laboratory of Cellular Stress Biology, Department of Gastroenterology, Zhongshan Hospital of Xiamen University, School of Medicine, Faculty of Medicine and Life Sciences, Xiamen University, Xiamen 361102, China; Department of Stomatology, School of Medicine, Xiamen University, Xiamen 361102, China; Guangdong Provincial Key Laboratory of Veterinary Pharmaceutics Development and Safety Evaluation, College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China.
| | - Xiaobao Deng
- State Key Laboratory of Cellular Stress Biology, Department of Gastroenterology, Zhongshan Hospital of Xiamen University, School of Medicine, Faculty of Medicine and Life Sciences, Xiamen University, Xiamen 361102, China; Department of Stomatology, School of Medicine, Xiamen University, Xiamen 361102, China
| | - Yidun Zhang
- Xiamen Center for Disease Control and Prevention, Xiamen 361021, China
| | - Weiyi Dong
- State Key Laboratory of Cellular Stress Biology, Department of Gastroenterology, Zhongshan Hospital of Xiamen University, School of Medicine, Faculty of Medicine and Life Sciences, Xiamen University, Xiamen 361102, China; Department of Stomatology, School of Medicine, Xiamen University, Xiamen 361102, China
| | - Qiao Rao
- State Key Laboratory of Cellular Stress Biology, Department of Gastroenterology, Zhongshan Hospital of Xiamen University, School of Medicine, Faculty of Medicine and Life Sciences, Xiamen University, Xiamen 361102, China; Department of Stomatology, School of Medicine, Xiamen University, Xiamen 361102, China
| | - Qingmei Huang
- Department of Stomatology, School of Medicine, Xiamen University, Xiamen 361102, China
| | - Fei Tang
- Xiamen Center for Disease Control and Prevention, Xiamen 361021, China
| | - Rong Shen
- State Key Laboratory of Cellular Stress Biology, Department of Gastroenterology, Zhongshan Hospital of Xiamen University, School of Medicine, Faculty of Medicine and Life Sciences, Xiamen University, Xiamen 361102, China
| | - Hongzhi Xu
- Department of Gastroenterology, The National Key Clinical Specialty, Zhongshan Hospital of Xiamen University, School of Medicine, Xiamen University, Xiamen 361004, China; Clinical Research Center for Gut Microbiota and Digestive Diseases of Fujian Province, Xiamen Key Laboratory of Intestinal Microbiome and Human Health, Zhongshan Hospital of Xiamen University, School of Medicine, Xiamen University, Xiamen 361004, China
| | - Zhen Jin
- Guangdong Provincial Key Laboratory of Veterinary Pharmaceutics Development and Safety Evaluation, College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China
| | - Youzhi Tang
- Guangdong Provincial Key Laboratory of Veterinary Pharmaceutics Development and Safety Evaluation, College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China.
| | - Dan Du
- State Key Laboratory of Cellular Stress Biology, Department of Gastroenterology, Zhongshan Hospital of Xiamen University, School of Medicine, Faculty of Medicine and Life Sciences, Xiamen University, Xiamen 361102, China; Department of Stomatology, School of Medicine, Xiamen University, Xiamen 361102, China; Innovation Center for Cell Signaling Network, Xiamen University, Xiamen 361102, China; Department of Gastroenterology, The National Key Clinical Specialty, Zhongshan Hospital of Xiamen University, School of Medicine, Xiamen University, Xiamen 361004, China; Clinical Research Center for Gut Microbiota and Digestive Diseases of Fujian Province, Xiamen Key Laboratory of Intestinal Microbiome and Human Health, Zhongshan Hospital of Xiamen University, School of Medicine, Xiamen University, Xiamen 361004, China.
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Dong Y, Zhang B, Wei Y, Murashev A, Wang S, Wu Y, Ma W, Liu T. Development of Cas13a-based therapy for cancer treatment. Mol Biol Rep 2024; 51:94. [PMID: 38194206 DOI: 10.1007/s11033-023-09129-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2023] [Accepted: 12/07/2023] [Indexed: 01/10/2024]
Abstract
Gene therapy has become a major focus of current biomedical research. CRISPR (Clustered Regularly Inter spaced Short Palindromic Repeats) systems have been extensively researched for disease treatment applications through genome editing specificity. Compared with Cas9 (CRISPR-associated proteins, Cas), a commonly used tool enzyme for genome editing, Cas13a exhibits RNA-dependent endonuclease activity, including collateral cleavage without obvious potential genetic risks. With its high specificity, Cas13a has significantly improved the sensitivity of viral diagnosis and shown potential to eliminate viruses. However, its efficacy in tumor therapy has not been determined. This review introduces the mechanism and research developments associated with the CRISPR-Cas13a system in tumor treatments and its potential to be used as a new tool for gene therapy. We hope more research would apply Cas13a-based therapy in cancer treatment in the future.
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Affiliation(s)
- Ying Dong
- Key Laboratory of Antibody Engineering of Guangdong Higher Education Institutes, School of Laboratory Medicine and Biotechnology, Southern Medical University, 1023 Shatai Rd, Guangzhou, 510515, China
| | - Bingyang Zhang
- Key Laboratory of Antibody Engineering of Guangdong Higher Education Institutes, School of Laboratory Medicine and Biotechnology, Southern Medical University, 1023 Shatai Rd, Guangzhou, 510515, China
| | - Yi Wei
- Key Laboratory of Antibody Engineering of Guangdong Higher Education Institutes, School of Laboratory Medicine and Biotechnology, Southern Medical University, 1023 Shatai Rd, Guangzhou, 510515, China
| | - Arkady Murashev
- Biological Testing Center of Shamyakin and Ovchimnikov Institute of Bioorganic Chemistry, Moscow, 142290, Russian Federation
| | - Suihai Wang
- Key Laboratory of Antibody Engineering of Guangdong Higher Education Institutes, School of Laboratory Medicine and Biotechnology, Southern Medical University, 1023 Shatai Rd, Guangzhou, 510515, China
| | - Yingsong Wu
- Key Laboratory of Antibody Engineering of Guangdong Higher Education Institutes, School of Laboratory Medicine and Biotechnology, Southern Medical University, 1023 Shatai Rd, Guangzhou, 510515, China
| | - Weifeng Ma
- Department of Microbiology, School of Public Health, Southern Medical University, 1023 Shatai Rd, Guangzhou, 510515, China.
| | - Tiancai Liu
- Key Laboratory of Antibody Engineering of Guangdong Higher Education Institutes, School of Laboratory Medicine and Biotechnology, Southern Medical University, 1023 Shatai Rd, Guangzhou, 510515, China.
- Department of Laboratory Medicine, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, China.
- Provincial Key Laboratory of Immune Regulation and Immunotherapy, Southern Medical University, Guangzhou, 510515, China.
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3
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Zhan X, Tu Z, Song W, Nie B, Li S, Zhang J, Zhang F. Cas13a-based multiplex RNA targeting for potato virus Y. Planta 2023; 258:70. [PMID: 37620620 DOI: 10.1007/s00425-023-04216-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/23/2023] [Accepted: 07/20/2023] [Indexed: 08/26/2023]
Abstract
MAIN CONCLUSION The Cas13a-based multiplex RNA targeting system can be engineered to confer resistance to RNA viruses, whereas the number and expression levels of gRNAs have no significant effect on viral interference. The CRISPR-Cas systems provide adaptive immunity to bacterial and archaeal species against invading phages and foreign plasmids. The class 2 type VI CRISPR/Cas effector Cas13a has been harnessed to confer the protection against RNA viruses in diverse eukaryotic species. However, whether the number and expression levels of guide RNAs (gRNAs) have effects on the efficiency of RNA virus inhibition is unknown. Here, we repurpose CRISPR/Cas13a in combination with an endogenous tRNA-processing system (polycistronic tRNA-gRNA) to target four genes of potato virus Y (PVY) with varying expression levels. We expressed Cas13a and four different gRNAs in potato lines, and the transgenic plants expressing multiple gRNAs displayed similar suppression of PVY accumulation and reduced disease symptoms as those expressing a single gRNA. Moreover, PTG/Cas13a-transformed plants with different expression levels of multiple gRNAs displayed similar resistance to PVY strains. Collectively, this study suggests that the Cas13a-based multiplex RNA targeting system can be utilized to engineer resistance to RNA viruses in plants, whereas the number and expression levels of gRNAs have no significant effect on CRISPR/Cas13a-mediated viral interference in plants.
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Affiliation(s)
- Xiaohui Zhan
- State Key Laboratory of Biocatalysis and Enzyme Engineering, School of Life Sciences, Hubei Hongshan Laboratory, Hubei University, Wuhan, 430062, China
| | - Zhen Tu
- Key Laboratory of Potato Biology and Biotechnology, Key Laboratory of Horticultural Plant Biology, Huazhong Agricultural University, Wuhan, 430070, China
| | - Wenlei Song
- State Key Laboratory of Biocatalysis and Enzyme Engineering, School of Life Sciences, Hubei Hongshan Laboratory, Hubei University, Wuhan, 430062, China
| | - Bihua Nie
- Key Laboratory of Potato Biology and Biotechnology, Key Laboratory of Horticultural Plant Biology, Huazhong Agricultural University, Wuhan, 430070, China
| | - Shengchun Li
- State Key Laboratory of Biocatalysis and Enzyme Engineering, School of Life Sciences, Hubei Hongshan Laboratory, Hubei University, Wuhan, 430062, China
| | - Jiang Zhang
- State Key Laboratory of Biocatalysis and Enzyme Engineering, School of Life Sciences, Hubei Hongshan Laboratory, Hubei University, Wuhan, 430062, China
- Agricultural Genomics Institute at Shenzhen, Chinese Academy of Agricultural Sciences, Shenzhen, China
| | - Fengjuan Zhang
- State Key Laboratory of Biocatalysis and Enzyme Engineering, School of Life Sciences, Hubei Hongshan Laboratory, Hubei University, Wuhan, 430062, China.
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MacGregor SR, McManus DP, Sivakumaran H, Egwang TG, Adriko M, Cai P, Gordon CA, Duke MG, French JD, Collinson N, Olveda RM, Hartel G, Graeff-Teixeira C, Jones MK, You H. Development of CRISPR/ Cas13a-based assays for the diagnosis of Schistosomiasis. EBioMedicine 2023; 94:104730. [PMID: 37487416 PMCID: PMC10382885 DOI: 10.1016/j.ebiom.2023.104730] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2023] [Revised: 07/11/2023] [Accepted: 07/13/2023] [Indexed: 07/26/2023] Open
Abstract
BACKGROUND Schistosomiasis is a disease that significantly impacts human health in the developing world. Effective diagnostics are urgently needed for improved control of this disease. CRISPR-based technology has rapidly accelerated the development of a revolutionary and powerful diagnostics platform, resulting in the advancement of a class of ultrasensitive, specific, cost-effective and portable diagnostics, typified by applications in COVID-19/cancer diagnosis. METHODS We developed CRISPR-based diagnostic platform SHERLOCK (Specific High-sensitivity Enzymatic Reporter unLOCKing) for the detection of Schistosoma japonicum and S. mansoni by combining recombinase polymerase amplification (RPA) with CRISPR-Cas13a detection, measured via fluorescent or colorimetric readouts. We evaluated SHERLOCK assays by using 150 faecal/serum samples collected from Schistosoma-infected ARC Swiss mice (female), and 189 human faecal/serum samples obtained from a S. japonicum-endemic area in the Philippines and a S. mansoni-endemic area in Uganda. FINDINGS The S. japonicum SHERLOCK assay achieved 93-100% concordance with gold-standard qPCR detection across all the samples. The S. mansoni SHERLOCK assay demonstrated higher sensitivity than qPCR and was able to detect infection in mouse serum as early as 3 weeks post-infection. In human samples, S. mansoni SHERLOCK had 100% sensitivity when compared to qPCR of faecal and serum samples. INTERPRETATION These schistosomiasis diagnostic assays demonstrate the potential of SHERLOCK/CRISPR-based diagnostics to provide highly accurate and field-friendly point-of-care tests that could provide the next generation of diagnostic and surveillance tools for parasitic neglected tropical diseases. FUNDING Australian Infectious Diseases Research Centre seed grant (2022) and National Health and Medical Research Council (NHMRC) of Australia (APP1194462, APP2008433).
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Affiliation(s)
- Skye R MacGregor
- Infection and Inflammation Department, QIMR Berghofer Medical Research Institute, Brisbane, Queensland, Australia
| | - Donald P McManus
- Infection and Inflammation Department, QIMR Berghofer Medical Research Institute, Brisbane, Queensland, Australia
| | - Haran Sivakumaran
- Genetics & Computational Biology Department, QIMR Berghofer Medical Research Institute, Brisbane, Queensland, Australia
| | - Thomas G Egwang
- Department of Immunology and Parasitology, Med Biotech Laboratories, Kampala, Uganda
| | - Moses Adriko
- Vector Borne and NTD Control Division, Ministry of Health, Kampala, Uganda
| | - Pengfei Cai
- Infection and Inflammation Department, QIMR Berghofer Medical Research Institute, Brisbane, Queensland, Australia
| | - Catherine A Gordon
- Infection and Inflammation Department, QIMR Berghofer Medical Research Institute, Brisbane, Queensland, Australia; School of Public Health, Faculty of Medicine, The University of Queensland, Brisbane, Australia
| | - Mary G Duke
- Infection and Inflammation Department, QIMR Berghofer Medical Research Institute, Brisbane, Queensland, Australia
| | - Juliet D French
- Genetics & Computational Biology Department, QIMR Berghofer Medical Research Institute, Brisbane, Queensland, Australia
| | - Natasha Collinson
- Infection and Inflammation Department, QIMR Berghofer Medical Research Institute, Brisbane, Queensland, Australia
| | - Remigio M Olveda
- Department of Health, Research Institute for Tropical Medicine, Manila, Philippines
| | - Gunter Hartel
- School of Public Health, Faculty of Medicine, The University of Queensland, Brisbane, Australia; Statistics, QIMR Berghofer Medical Research Institute, Brisbane, Queensland, Australia; School of Nursing, Queensland University of Technology, Brisbane, Queensland, Australia
| | - Carlos Graeff-Teixeira
- Department of Pathology, Infectious Diseases Unit, Health Sciences Center, Universidade Federal do Espírito Santo, Vitória, Brazil
| | - Malcolm K Jones
- Infection and Inflammation Department, QIMR Berghofer Medical Research Institute, Brisbane, Queensland, Australia; School of Veterinary Science, The University of Queensland, Gatton, Queensland, Australia
| | - Hong You
- Infection and Inflammation Department, QIMR Berghofer Medical Research Institute, Brisbane, Queensland, Australia; School of Veterinary Science, The University of Queensland, Gatton, Queensland, Australia.
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5
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Hong J, Son T, Castro CM, Im H. CRISPR/ Cas13a-Based MicroRNA Detection in Tumor-Derived Extracellular Vesicles. Adv Sci (Weinh) 2023; 10:e2301766. [PMID: 37340600 PMCID: PMC10460892 DOI: 10.1002/advs.202301766] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/18/2023] [Revised: 05/23/2023] [Indexed: 06/22/2023]
Abstract
MicroRNAs (miRNAs) in extracellular vesicles (EVs) play essential roles in cancer initiation and progression. Quantitative measurements of EV miRNAs are critical for cancer diagnosis and longitudinal monitoring. Traditional PCR-based methods, however, require multi-step procedures and remain as bulk analysis. Here, the authors introduce an amplification-free and extraction-free EV miRNA detection method using a CRISPR/Cas13a sensing system. CRISPR/Cas13a sensing components are encapsulated in liposomes and delivered them into EVs through liposome-EV fusion. This allows for accurately quantify specific miRNA-positive EV counts using 1 × 108 EVs. The authors show that miR-21-5p-positive EV counts are in the range of 2%-10% in ovarian cancer EVs, which is significantly higher than the positive EV counts from the benign cells (<0.65%). The result show an excellent correlation between bulk analysis with the gold-standard method, RT-qPCR. The authors also demonstrate multiplexed protein-miRNA analysis in tumor-derived EVs by capturing EpCAM-positive EVs and quantifying miR-21-5p-positive ones in the subpopulation, which show significantly higher counts in the plasma of cancer patients than healthy controls. The developed EV miRNA sensing system provides the specific miRNA detection method in intact EVs without RNA extraction and opens up the possibility of multiplexed single EV analysis for protein and RNA markers.
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Affiliation(s)
- Jae‐Sang Hong
- Center for Systems BiologyMassachusetts General HospitalBostonMA02114USA
| | - Taehwang Son
- Center for Systems BiologyMassachusetts General HospitalBostonMA02114USA
| | - Cesar M. Castro
- Center for Systems BiologyMassachusetts General HospitalBostonMA02114USA
- Cancer CenterMassachusetts General HospitalBostonMA02114USA
| | - Hyungsoon Im
- Center for Systems BiologyMassachusetts General HospitalBostonMA02114USA
- Department of RadiologyMassachusetts General HospitalBostonMA02114USA
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Kadam US, Cho Y, Park TY, Hong JC. Aptamer-based CRISPR-Cas powered diagnostics of diverse biomarkers and small molecule targets. Appl Biol Chem 2023; 66:13. [PMID: 36843874 PMCID: PMC9937869 DOI: 10.1186/s13765-023-00771-9] [Citation(s) in RCA: 15] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/21/2023] [Accepted: 02/03/2023] [Indexed: 06/06/2023]
Abstract
CRISPR-Cas systems have been widely used in genome editing and transcriptional regulation. Recently, CRISPR-Cas effectors are adopted for biosensor construction due to its adjustable properties, such as simplicity of design, easy operation, collateral cleavage activity, and high biocompatibility. Aptamers' excellent sensitivity, specificity, in vitro synthesis, base-pairing, labeling, modification, and programmability has made them an attractive molecular recognition element for inclusion in CRISPR-Cas systems. Here, we review current advances in aptamer-based CRISPR-Cas sensors. We briefly discuss aptamers and the knowledge of Cas effector proteins, crRNA, reporter probes, analytes, and applications of target-specific aptamers. Next, we provide fabrication strategies, molecular binding, and detection using fluorescence, electrochemical, colorimetric, nanomaterials, Rayleigh, and Raman scattering. The application of CRISPR-Cas systems in aptamer-based sensing of a wide range of biomarkers (disease and pathogens) and toxic contaminants is growing. This review provides an update and offers novel insights into developing CRISPR-Cas-based sensors using ssDNA aptamers with high efficiency and specificity for point-of-care setting diagnostics.
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Affiliation(s)
- Ulhas Sopanrao Kadam
- Division of Life Science and Division of Applied Life Science (BK21 Four), Plant Molecular Biology and Biotechnology Research Center, Gyeongsang National University, Jinju, Gyeongnam-do 52828 Republic of Korea
| | - Yuhan Cho
- Division of Life Science and Division of Applied Life Science (BK21 Four), Plant Molecular Biology and Biotechnology Research Center, Gyeongsang National University, Jinju, Gyeongnam-do 52828 Republic of Korea
| | - Tae Yoon Park
- Graduate School of Education, Yonsei University, Seoul, 03722 Republic of Korea
| | - Jong Chan Hong
- Division of Life Science and Division of Applied Life Science (BK21 Four), Plant Molecular Biology and Biotechnology Research Center, Gyeongsang National University, Jinju, Gyeongnam-do 52828 Republic of Korea
- Division of Plant Sciences, University of Missouri, Columbia, MO 65211 USA
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Yu H, Zhang H, Li J, Zhao Z, Deng M, Ren Z, Li Z, Xue C, Li MG, Chen Z. Rapid and Unamplified Detection of SARS-CoV-2 RNA via CRISPR- Cas13a-Modified Solution-Gated Graphene Transistors. ACS Sens 2022; 7:3923-3932. [PMID: 36472865 PMCID: PMC9745736 DOI: 10.1021/acssensors.2c01990] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2022] [Accepted: 11/22/2022] [Indexed: 12/12/2022]
Abstract
The disease caused by severe acute respiratory syndrome coronavirus, SARS-CoV-2, is termed COVID-19. Even though COVID-19 has been out for more than two years, it is still causing a global pandemic. Due to the limitations of sample collection, transportation, and kit performance, the traditional reverse transcription-quantitative polymerase chain reaction (RT-qPCR) method has a long detection period and high testing costs. An increased risk of infection is inevitable, since many patients may not be diagnosed in time. The CRISPR-Cas13a system can be designed for RNA identification and knockdown, as a promising platform for nucleic acid detection. Here, we designed a solution-gated graphene transistor (SGGT) biosensor based on the CRISPR-Cas13a system. Using the gene-targeting capacity of CRISPR-Cas13a and gate functionalization via multilayer modification, SARS-CoV-2 nucleic acid sequences can be quickly and precisely identified without the need for amplification or fluorescence tagging. The limit of detection (LOD) in both buffer and serum reached the aM level, and the reaction time was about 10 min. The results of the detection of COVID-19 clinical samples from throat swabs agree with RT-PCR. In addition, the interchangeable gates significantly minimize the cost and time of device fabrication. In a nutshell, our biosensor technology is broadly applicable and will be suitable for point-of-care (POC) testing.
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Affiliation(s)
- Haiyang Yu
- State Key Laboratory of Advanced Technology for
Materials Synthesis and Processing, Wuhan University of
Technology, Wuhan430070, China
- Collaborative Innovation Center for Advanced Organic
Chemical Materials Co-constructed by the Province and Ministry, Key Laboratory for the
Green Preparation and Application of Functional Materials, Ministry of Education, Hubei
Key Laboratory of Polymer Materials, School of Materials Science and Engineering,
Hubei University, Wuhan430062, China
| | - Huibin Zhang
- Collaborative Innovation Center for Advanced Organic
Chemical Materials Co-constructed by the Province and Ministry, Key Laboratory for the
Green Preparation and Application of Functional Materials, Ministry of Education, Hubei
Key Laboratory of Polymer Materials, School of Materials Science and Engineering,
Hubei University, Wuhan430062, China
| | - Jinhua Li
- Collaborative Innovation Center for Advanced Organic
Chemical Materials Co-constructed by the Province and Ministry, Key Laboratory for the
Green Preparation and Application of Functional Materials, Ministry of Education, Hubei
Key Laboratory of Polymer Materials, School of Materials Science and Engineering,
Hubei University, Wuhan430062, China
| | - Zheng Zhao
- State Key Laboratory of Advanced Technology for
Materials Synthesis and Processing, Wuhan University of
Technology, Wuhan430070, China
- Sanya Science and Education Innovation Park
of Wuhan University of Technology, Sanya572000,
China
| | - Minhua Deng
- Collaborative Innovation Center for Advanced Organic
Chemical Materials Co-constructed by the Province and Ministry, Key Laboratory for the
Green Preparation and Application of Functional Materials, Ministry of Education, Hubei
Key Laboratory of Polymer Materials, School of Materials Science and Engineering,
Hubei University, Wuhan430062, China
| | - Zhanpeng Ren
- Collaborative Innovation Center for Advanced Organic
Chemical Materials Co-constructed by the Province and Ministry, Key Laboratory for the
Green Preparation and Application of Functional Materials, Ministry of Education, Hubei
Key Laboratory of Polymer Materials, School of Materials Science and Engineering,
Hubei University, Wuhan430062, China
| | - Ziqin Li
- Collaborative Innovation Center for Advanced Organic
Chemical Materials Co-constructed by the Province and Ministry, Key Laboratory for the
Green Preparation and Application of Functional Materials, Ministry of Education, Hubei
Key Laboratory of Polymer Materials, School of Materials Science and Engineering,
Hubei University, Wuhan430062, China
| | - Chenglong Xue
- Collaborative Innovation Center for Advanced Organic
Chemical Materials Co-constructed by the Province and Ministry, Key Laboratory for the
Green Preparation and Application of Functional Materials, Ministry of Education, Hubei
Key Laboratory of Polymer Materials, School of Materials Science and Engineering,
Hubei University, Wuhan430062, China
| | - Mitch Guijun Li
- Division of Integrative Systems and Design,
The Hong Kong University of Science and Technology, Clear
Water Bay, Kowloon, Hong Kong SAR999077, China
| | - Zhaowei Chen
- Division of Nephrology, Renmin Hospital
of Wuhan University, Wuhan430060, China
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Johnson MC, Hille LT, Kleinstiver BP, Meeske AJ, Bondy-Denomy J. Lack of Cas13a inhibition by anti-CRISPR proteins from Leptotrichia prophages. Mol Cell 2022; 82:2161-2166.e3. [PMID: 35623354 PMCID: PMC9186262 DOI: 10.1016/j.molcel.2022.05.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2021] [Revised: 12/02/2021] [Accepted: 05/03/2022] [Indexed: 11/19/2022]
Abstract
CRISPR systems are prokaryotic adaptive immune systems that use RNA-guided Cas nucleases to recognize and destroy foreign genetic elements. To overcome CRISPR immunity, bacteriophages have evolved diverse families of anti-CRISPR proteins (Acrs). Recently, Lin et al. (2020) described the discovery and characterization of 7 Acr families (AcrVIA1-7) that inhibit type VI-A CRISPR systems. We detail several inconsistencies that question the results reported in the Lin et al. (2020) study. These include inaccurate bioinformatics analyses and bacterial strains that are impossible to construct. Published strains were provided by the authors, but MS2 bacteriophage plaque assays did not support the published results. We also independently tested the Acr sequences described in the original report, in E. coli and mammalian cells, but did not observe anti-Cas13a activity. Taken together, our data and analyses prompt us to question the claim that AcrVIA1-7 reported in Lin et al. are type VI anti-CRISPR proteins.
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Affiliation(s)
- Matthew C Johnson
- Department of Microbiology and Immunology, University of California, San Francisco, San Francisco, CA 94158, USA
| | - Logan T Hille
- PhD Program in Biological and Biomedical Sciences, Harvard University, Boston, MA 02115, USA; Center for Genomic Medicine, Massachusetts General Hospital, Boston, MA 02114, USA; Department of Pathology, Massachusetts General Hospital, Boston, MA 02114, USA
| | - Benjamin P Kleinstiver
- Center for Genomic Medicine, Massachusetts General Hospital, Boston, MA 02114, USA; Department of Pathology, Massachusetts General Hospital, Boston, MA 02114, USA; Department of Pathology, Harvard Medical School, Boston, MA 02115, USA
| | - Alexander J Meeske
- Department of Microbiology, University of Washington, Seattle, WA 98109, USA.
| | - Joseph Bondy-Denomy
- Department of Microbiology and Immunology, University of California, San Francisco, San Francisco, CA 94158, USA; Quantitative Biosciences Institute, University of California, San Francisco, San Francisco, CA 94158, USA; Innovative Genomics Institute, Berkeley, CA 94720, USA.
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Wang J, Xia Q, Wu J, Lin Y, Ju H. A sensitive electrochemical method for rapid detection of dengue virus by CRISPR/ Cas13a-assisted catalytic hairpin assembly. Anal Chim Acta 2021; 1187:339131. [PMID: 34753581 DOI: 10.1016/j.aca.2021.339131] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2021] [Revised: 09/24/2021] [Accepted: 09/28/2021] [Indexed: 12/26/2022]
Abstract
Dengue fever caused by Dengue virus (DENV) infection has been widely popular, especially in tropical and subtropical areas. Rapid and sensitive diagnosis is the first priority for treatment of DENV infection. This work designed a signal amplification strategy for sensitive electrochemical detection of DENV by using a clustered regularly interspaced short palindromic repeats (CRISPR)/Cas13a system for catalytic hairpin assembly on electrode surface. The presence of target RNA could activate the cleavage activity of the CRISPR/Cas13a system to release the blocker silenced swing arms, which then hybridized with hairpin 1 (H1) immobilized on electrode surface to expose the pre-locked toehold domain of H1 for the hybridization of ferrocene-labeled hairpin 2 (H2-Fc). Eventually, a large number of H2-Fc were captured to the electrode to produce amperometric signal for achieving signal amplification. This method showed a linear detection range from 5 fM to 50 nM with a detection limit of 0.78 fM. The proposed assay was successfully used to detect DENV type 1 in total RNA sample extracted, indicating great potential for application in early clinical diagnostic.
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Affiliation(s)
- Jiaojiao Wang
- Key Laboratory of Tropical Translational Medicine of Ministry of Education, School of Tropical Medicine and Laboratory Medicine, Hainan Medical University, Haikou, 571199, PR China
| | - Qianfeng Xia
- Key Laboratory of Tropical Translational Medicine of Ministry of Education, School of Tropical Medicine and Laboratory Medicine, Hainan Medical University, Haikou, 571199, PR China
| | - Jie Wu
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023, PR China
| | - Yingzi Lin
- Key Laboratory of Tropical Translational Medicine of Ministry of Education, School of Tropical Medicine and Laboratory Medicine, Hainan Medical University, Haikou, 571199, PR China.
| | - Huangxian Ju
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023, PR China.
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10
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Cunningham CH, Hennelly CM, Lin JT, Ubalee R, Boyce RM, Mulogo EM, Hathaway N, Thwai KL, Phanzu F, Kalonji A, Mwandagalirwa K, Tshefu A, Juliano JJ, Parr JB. A novel CRISPR-based malaria diagnostic capable of Plasmodium detection, species differentiation, and drug-resistance genotyping. EBioMedicine 2021; 68:103415. [PMID: 34139428 PMCID: PMC8213918 DOI: 10.1016/j.ebiom.2021.103415] [Citation(s) in RCA: 39] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2020] [Revised: 05/10/2021] [Accepted: 05/12/2021] [Indexed: 12/26/2022] Open
Abstract
Background CRISPR-based diagnostics are a new class of highly sensitive and specific assays with multiple applications in infectious disease diagnosis. SHERLOCK, or Specific High-Sensitivity Enzymatic Reporter UnLOCKing, is one such CRISPR-based diagnostic that combines recombinase polymerase pre-amplification, CRISPR-RNA base-pairing, and LwCas13a activity for nucleic acid detection. Methods We developed SHERLOCK assays capable of detecting all Plasmodium species known to cause human malaria and species-specific detection of P. vivax and P. falciparum, the species responsible for the majority of malaria cases worldwide. We further tested these assays using a diverse panel of clinical samples from the Democratic Republic of the Congo, Uganda, and Thailand and pools of Anopheles mosquitoes from Thailand. In addition, we developed a prototype SHERLOCK assay capable of detecting the dihydropteroate synthetase (dhps) single nucleotide variant A581G associated with P. falciparum sulfadoxine resistance. Findings The suite of Plasmodium assays achieved analytical sensitivities ranging from 2•5-18•8 parasites per reaction when tested against laboratory strain genomic DNA. When compared to real-time PCR, the P. falciparum assay achieved 94% sensitivity and 94% specificity during testing of 123 clinical samples. Compared to amplicon-based deep sequencing, the dhps SHERLOCK assay achieved 73% sensitivity and 100% specificity when applied to a panel of 43 clinical samples, with false-negative calls only at lower parasite densities. Interpretation These novel SHERLOCK assays demonstrate the versatility of CRISPR-based diagnostics and their potential as a new generation of molecular tools for malaria diagnosis and surveillance. Funding National Institutes of Health (T32GM007092, R21AI148579, K24AI134990, R01AI121558, UL1TR002489, P30CA016086)
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Affiliation(s)
- Clark H Cunningham
- University of North Carolina at Chapel Hill, Chapel Hill, NC, United States
| | | | - Jessica T Lin
- University of North Carolina at Chapel Hill, Chapel Hill, NC, United States
| | - Ratawan Ubalee
- Armed Forces Research Institute of Medical Sciences, Bangkok, Thailand
| | - Ross M Boyce
- University of North Carolina at Chapel Hill, Chapel Hill, NC, United States; Mbarara University of Science and Technology, Mbarara, Uganda
| | - Edgar M Mulogo
- Mbarara University of Science and Technology, Mbarara, Uganda
| | - Nicholas Hathaway
- University of Massachusetts School of Medicine, Worcester, MA, United States
| | - Kyaw L Thwai
- University of North Carolina at Chapel Hill, Chapel Hill, NC, United States
| | - Fernandine Phanzu
- SANRU ASBL (Global Fund), Kinshasa, Democratic Republic of the Congo
| | - Albert Kalonji
- SANRU ASBL (Global Fund), Kinshasa, Democratic Republic of the Congo
| | | | - Antoinette Tshefu
- Kinshasa School of Public Health, Kinshasa, Democratic Republic of the Congo
| | - Jonathan J Juliano
- University of North Carolina at Chapel Hill, Chapel Hill, NC, United States
| | - Jonathan B Parr
- University of North Carolina at Chapel Hill, Chapel Hill, NC, United States.
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11
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Fujita T, Nagata S, Yuno M, Fujii H. Sequence-specific inhibition of reverse transcription by recombinant CRISPR/d Cas13a ribonucleoprotein complexes in vitro. Biol Methods Protoc 2021; 6:bpab009. [PMID: 33981854 PMCID: PMC8106441 DOI: 10.1093/biomethods/bpab009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2020] [Revised: 04/10/2021] [Accepted: 04/17/2021] [Indexed: 11/23/2022] Open
Abstract
The clustered regularly interspaced short palindromic repeats (CRISPR) system is widely used for genome editing because of its ability to cleave specific DNA sequences. Recently, RNA-specific CRISPR systems have been reported. CRISPR systems, consisting of a guide RNA (gRNA) and a nuclease-dead form of Cas13a (dCas13a), can be used for RNA editing and visualization of target RNA. In this study, we examined whether a recombinant CRISPR/dCas13a ribonucleoprotein (RNP) complex could be used to inhibit reverse transcription (RT) in a sequence-specific manner in vitro. Recombinant Leptotrichia wadei dCas13a was expressed using the silkworm-baculovirus expression system and affinity-purified. We found that the CRISPR/dCas13a RNP complex, combined with a chemically synthesized gRNA sequence, could specifically inhibit RT of EGFR and NEAT1, but not nonspecific RNA. Thus, the CRISPR/dCas13a RNP complex can inhibit RT reactions in a sequence-specific manner. RT inhibition by the CRISPR/dCas13a system may be useful to assess target binding activity, to discriminate RNA species retaining target sequences of gRNA, or to suppress RT from undesirable RNA species.
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Affiliation(s)
- Toshitsugu Fujita
- Department of Biochemistry and Genome Biology, Hirosaki University Graduate School of Medicine, 5 Zaifu-cho, Hirosaki, Aomori 036-8562, Japan.,Chromatin Biochemistry Research Group, Combined Program on Microbiology and Immunology, Research Institute for Microbial Diseases, Osaka University, 3-1 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Shoko Nagata
- Department of Biochemistry and Genome Biology, Hirosaki University Graduate School of Medicine, 5 Zaifu-cho, Hirosaki, Aomori 036-8562, Japan
| | - Miyuki Yuno
- Chromatin Biochemistry Research Group, Combined Program on Microbiology and Immunology, Research Institute for Microbial Diseases, Osaka University, 3-1 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Hodaka Fujii
- Department of Biochemistry and Genome Biology, Hirosaki University Graduate School of Medicine, 5 Zaifu-cho, Hirosaki, Aomori 036-8562, Japan.,Chromatin Biochemistry Research Group, Combined Program on Microbiology and Immunology, Research Institute for Microbial Diseases, Osaka University, 3-1 Yamadaoka, Suita, Osaka 565-0871, Japan
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12
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Baerwald MR, Goodbla AM, Nagarajan RP, Gootenberg JS, Abudayyeh OO, Zhang F, Schreier AD. Rapid and accurate species identification for ecological studies and monitoring using CRISPR-based SHERLOCK. Mol Ecol Resour 2020; 20:961-970. [PMID: 32396992 PMCID: PMC7497203 DOI: 10.1111/1755-0998.13186] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2019] [Revised: 03/17/2020] [Accepted: 04/23/2020] [Indexed: 12/26/2022]
Abstract
One of the most fundamental aspects of ecological research and monitoring is accurate species identification, but cryptic speciation and observer error can confound phenotype‐based identification. The CRISPR‐Cas toolkit has facilitated remarkable advances in many scientific disciplines, but the fields of ecology and conservation biology have yet to fully embrace this powerful technology. The recently developed CRISPR‐Cas13a platform SHERLOCK (Specific High‐sensitivity Enzymatic Reporter unLOCKing) enables highly accurate taxonomic identification and has all the characteristics needed to transition to ecological and environmental disciplines. Here we conducted a series of “proof of principle” experiments to characterize SHERLOCK’s ability to accurately, sensitively and rapidly distinguish three fish species of management interest co‐occurring in the San Francisco Estuary that are easily misidentified in the field. We improved SHERLOCK’s ease of field deployment by combining the previously demonstrated rapid isothermal amplification and CRISPR genetic identification with a minimally invasive and extraction‐free DNA collection protocol, as well as the option of instrument‐free lateral flow detection. This approach opens the door for redefining how, where and by whom genetic identifications occur in the future.
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Affiliation(s)
| | - Alisha M Goodbla
- Department of Animal Science, University of California Davis, Davis, CA, USA
| | - Raman P Nagarajan
- Department of Animal Science, University of California Davis, Davis, CA, USA
| | - Jonathan S Gootenberg
- Broad Institute of the Massachusetts Institute of Technology (MIT) and Harvard, Cambridge, MA, USA.,McGovern Institute for Brain Research, MIT, Cambridge, MA, USA.,Department of Brain and Cognitive Science, MIT, Cambridge, MA, USA.,Department of Biological Engineering, MIT, Cambridge, MA, USA.,Department of Systems Biology, Harvard University, Boston, MA, USA
| | - Omar O Abudayyeh
- Broad Institute of the Massachusetts Institute of Technology (MIT) and Harvard, Cambridge, MA, USA.,McGovern Institute for Brain Research, MIT, Cambridge, MA, USA.,Department of Brain and Cognitive Science, MIT, Cambridge, MA, USA.,Department of Biological Engineering, MIT, Cambridge, MA, USA.,Department of Health Sciences and Technology, MIT, Cambridge, MA, USA
| | - Feng Zhang
- Broad Institute of the Massachusetts Institute of Technology (MIT) and Harvard, Cambridge, MA, USA.,McGovern Institute for Brain Research, MIT, Cambridge, MA, USA.,Department of Brain and Cognitive Science, MIT, Cambridge, MA, USA.,Department of Biological Engineering, MIT, Cambridge, MA, USA
| | - Andrea D Schreier
- Department of Animal Science, University of California Davis, Davis, CA, USA
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13
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Lin P, Qin S, Pu Q, Wang Z, Wu Q, Gao P, Schettler J, Guo K, Li R, Li G, Huang C, Wei Y, Gao GF, Jiang J, Wu M. CRISPR-Cas13 Inhibitors Block RNA Editing in Bacteria and Mammalian Cells. Mol Cell 2020; 78:850-861.e5. [PMID: 32348779 DOI: 10.1016/j.molcel.2020.03.033] [Citation(s) in RCA: 43] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2020] [Revised: 03/10/2020] [Accepted: 03/25/2020] [Indexed: 02/08/2023]
Abstract
Cas13 has demonstrated unique and broad utility in RNA editing, nucleic acid detection, and disease diagnosis; however, a constantly active Cas enzyme may induce unwanted effects. Bacteriophage- or prophage-region-encoded anti-CRISPR (acr) gene molecules provide the potential to control targeting specificity and potency to allow for optimal RNA editing and nucleic acid detection by spatiotemporally modulating endonuclease activities. Using integrated approaches to screen acrVI candidates and evaluate their effects on Cas13 function, we discovered a series of acrVIA1-7 genes that block the activities of Cas13a. These VI-A CRISPR inhibitors substantially attenuate RNA targeting and editing by Cas13a in human cells. Strikingly, type VI-A anti-CRISPRs (AcrVIAs) also significantly muffle the single-nucleic-acid editing ability of the dCas13a RNA-editing system. Mechanistically, AcrVIA1, -4, -5, and -6 bind LwaCas13a, while AcrVIA2 and -3 can only bind the LwaCas13-crRNA (CRISPR RNA) complex. These identified acr molecules may enable precise RNA editing in Cas13-based application and study of phage-bacterium interaction.
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14
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Qi F, Tan B, Ma F, Zhu B, Zhang L, Liu X, Li H, Yang J, Cheng B. A Synthetic Light-switchable System based on CRISPR Cas13a Regulates the Expression of LncRNA MALAT1 and Affects the Malignant Phenotype of Bladder Cancer Cells. Int J Biol Sci 2019; 15:1630-1636. [PMID: 31360106 PMCID: PMC6643210 DOI: 10.7150/ijbs.33772] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2019] [Accepted: 04/10/2019] [Indexed: 12/19/2022] Open
Abstract
DNA sequences drive their various functions through post-transcriptional processes, using mRNA or lncRNA (long non-coding RNA), and this accommodates the gene network by using various RNA types. However, the tools necessary to regulate RNA molecules are few. Likewise, RNA knockdown techniques that can be artificially controlled have not been extensively explored. Here, we investigated a novel light-inducible synthetic system based on CRISPR-Cas13a that can be used for RNA knockdown and binding in cancer cells. Based on the techniques of synthetic molecular biology, we constructed a light sensor, which efficiently induced Cas13a protein expression after blue light illumination. We also chose a lncRNA, Metastasis-associated Lung Adenocarcinoma Transcript 1 (MALAT1), as the functional target and detected it in bladder cancer 5637 and T24 cells in order to demonstrate the application of our synthetic system. Fluorescence reporter assays and real-time quantitative PCR (qRT-PCR) were used to detect the expression of the target gene. Phenotypic experiments were also used to test the effects of our synthetic system in bladder cancers. The results showed that our synthetic light-switchable system could inhibit the expression of MALAT1, and the fluorescence activity of enhanced green fluorescent protein. Our novel system provides a new technique to study RNA functions in gene networks and for precise tumor treatments.
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Affiliation(s)
- Fuming Qi
- Urology and Andrology Department, Shengli OilFiled Central Hospital, Dongying, 257034, Shandong, China
| | - Bo Tan
- Urology and Andrology Department, Shengli OilFiled Central Hospital, Dongying, 257034, Shandong, China
| | - Fujun Ma
- Urology and Andrology Department, Shengli OilFiled Central Hospital, Dongying, 257034, Shandong, China
| | - Bo Zhu
- Urology and Andrology Department, Shengli OilFiled Central Hospital, Dongying, 257034, Shandong, China
| | - Li Zhang
- Burn and Plastic surgery Department, Shengli OilFiled Central Hospital, Dongying, 257034, Shandong, China
| | - Xiaoyun Liu
- Urology and Andrology Department, Shengli OilFiled Central Hospital, Dongying, 257034, Shandong, China
| | - Honglei Li
- Medical Department, Shengli OilFiled Central Hospital, Dongying, 257034, Shandong, China
| | - Jinhui Yang
- Urology and Andrology Department, Shengli OilFiled Central Hospital, Dongying, 257034, Shandong, China
| | - Bo Cheng
- Urology and Andrology Department, Shengli OilFiled Central Hospital, Dongying, 257034, Shandong, China
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15
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Abstract
The CRISPR‐Cas system is a key technology for genome editing and regulation in a wide range of organisms and cell types. Recently, CRISPR‐Cas–based diagnostic platform has shown idealistic properties for pathogen detection. Integrating the CRISPR‐Cas platform along with lateral flow system allows rapid, sensitive, specific, cheap, and reliable diagnostic. It has the potential to be in frontline for not only pathogen detection during the epidemic outbreak, but also cancer, and genetic diseases.
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Affiliation(s)
- Khushal Khambhati
- Department of Microbiology, Synthetic Biology Laboratory, School of Biological Sciences and Biotechnology, Institute of Advanced Research, Gandhinagar, India
| | - Gargi Bhattacharjee
- Department of Microbiology, Synthetic Biology Laboratory, School of Biological Sciences and Biotechnology, Institute of Advanced Research, Gandhinagar, India
| | - Vijai Singh
- Department of Microbiology, Synthetic Biology Laboratory, School of Biological Sciences and Biotechnology, Institute of Advanced Research, Gandhinagar, India
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16
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Tambe A, East-Seletsky A, Knott GJ, Doudna JA, O'Connell MR. RNA Binding and HEPN-Nuclease Activation Are Decoupled in CRISPR- Cas13a. Cell Rep 2018; 24:1025-1036. [PMID: 30044970 PMCID: PMC6085867 DOI: 10.1016/j.celrep.2018.06.105] [Citation(s) in RCA: 78] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2018] [Revised: 05/24/2018] [Accepted: 06/27/2018] [Indexed: 12/26/2022] Open
Abstract
CRISPR-Cas13a enzymes are RNA-guided, RNA-activated RNases. Their properties have been exploited as powerful tools for RNA detection, RNA imaging, and RNA regulation. However, the relationship between target RNA binding and HEPN (higher eukaryotes and prokaryotes nucleotide binding) domain nuclease activation is poorly understood. Using sequencing experiments coupled with in vitro biochemistry, we find that Cas13a target RNA binding affinity and HEPN-nuclease activity are differentially affected by the number and the position of mismatches between the guide and the target. We identify a central binding seed for which perfect base pairing is required for target binding and a separate nuclease switch for which imperfect base pairing results in tight binding, but not HEPN-nuclease activation. These results demonstrate that the binding and cleavage activities of Cas13a are decoupled, highlighting a complex specificity landscape. Our findings underscore a need to consider the range of effects off-target recognition has on Cas13a RNA binding and cleavage behavior for RNA-targeting tool development.
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Affiliation(s)
- Akshay Tambe
- Department of Molecular and Cell Biology, University of California, Berkeley, Berkeley, CA 94720, USA
| | - Alexandra East-Seletsky
- Department of Molecular and Cell Biology, University of California, Berkeley, Berkeley, CA 94720, USA
| | - Gavin J Knott
- Department of Molecular and Cell Biology, University of California, Berkeley, Berkeley, CA 94720, USA
| | - Jennifer A Doudna
- Department of Molecular and Cell Biology, University of California, Berkeley, Berkeley, CA 94720, USA; Department of Chemistry, University of California, Berkeley, Berkeley, CA 94720, USA; Howard Hughes Medical Institute, University of California, Berkeley, Berkeley, CA 94720, USA; Innovative Genomics Institute, University of California, Berkeley, Berkeley, CA 94720, USA; MBIB Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
| | - Mitchell R O'Connell
- Department of Biochemistry and Biophysics, School of Medicine and Dentistry, University of Rochester, Rochester, NY 14642, USA; Center for RNA Biology, University of Rochester, Rochester, NY 14642, USA.
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17
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Collins PJ, Hale CM, Xu H. Edited course of biomedical research: leaping forward with CRISPR. Pharmacol Res 2017; 125:258-65. [PMID: 28918173 DOI: 10.1016/j.phrs.2017.09.008] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/06/2017] [Revised: 09/12/2017] [Accepted: 09/12/2017] [Indexed: 12/26/2022]
Abstract
Within the short few years since the report of its application in precise genome editing, CRISPR technology has become the method of choice to modify and modulate gene expression in biomedical research and therapeutic development. Subsequently, a variety of research, diagnostic, and therapeutic tools have been developed based upon CRISPR's mechanism of action. Such tools have helped to deepen the understanding of fundamental biology and broaden the horizon in the search for treatments for diseases that have been considered hard or impossible to cure. As CRISPR technology advances closer to clinical applications, its short comings are becoming more apparent, thus creating opportunities to improve the technology's efficacy, specificity, and safety profile in this setting. We will summarize the current status of CRISPR technology and discuss its future impact in this review.
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18
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Liu L, Li X, Ma J, Li Z, You L, Wang J, Wang M, Zhang X, Wang Y. The Molecular Architecture for RNA-Guided RNA Cleavage by Cas13a. Cell 2017; 170:714-726.e10. [PMID: 28757251 DOI: 10.1016/j.cell.2017.06.050] [Citation(s) in RCA: 259] [Impact Index Per Article: 37.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2017] [Revised: 06/26/2017] [Accepted: 06/30/2017] [Indexed: 12/20/2022]
Abstract
Cas13a, a type VI-A CRISPR-Cas RNA-guided RNA ribonuclease, degrades invasive RNAs targeted by CRISPR RNA (crRNA) and has potential applications in RNA technology. To understand how Cas13a is activated to cleave RNA, we have determined the crystal structure of Leptotrichia buccalis (Lbu) Cas13a bound to crRNA and its target RNA, as well as the cryo-EM structure of the LbuCas13a-crRNA complex. The crRNA-target RNA duplex binds in a positively charged central channel of the nuclease (NUC) lobe, and Cas13a protein and crRNA undergo a significant conformational change upon target RNA binding. The guide-target RNA duplex formation triggers HEPN1 domain to move toward HEPN2 domain, activating the HEPN catalytic site of Cas13a protein, which subsequently cleaves both single-stranded target and collateral RNAs in a non-specific manner. These findings reveal how Cas13a of type VI CRISPR-Cas systems defend against RNA phages and set the stage for its development as a tool for RNA manipulation.
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MESH Headings
- Bacterial Proteins/chemistry
- Bacterial Proteins/ultrastructure
- Base Sequence
- CRISPR-Associated Proteins/chemistry
- CRISPR-Associated Proteins/ultrastructure
- CRISPR-Cas Systems
- Leptotrichia/chemistry
- Leptotrichia/immunology
- Leptotrichia/metabolism
- Leptotrichia/virology
- Models, Molecular
- RNA Processing, Post-Transcriptional
- RNA, Bacterial/chemistry
- RNA, Bacterial/genetics
- RNA, Bacterial/ultrastructure
- RNA, Guide, CRISPR-Cas Systems/chemistry
- RNA, Guide, CRISPR-Cas Systems/genetics
- RNA, Guide, CRISPR-Cas Systems/ultrastructure
- RNA, Viral/chemistry
- X-Ray Diffraction
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Affiliation(s)
- Liang Liu
- Key Laboratory of RNA Biology, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China
| | - Xueyan Li
- Key Laboratory of RNA Biology, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Jun Ma
- National Laboratory of Biomacromolecules, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China
| | - Zongqiang Li
- Key Laboratory of RNA Biology, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China
| | - Lilan You
- Key Laboratory of RNA Biology, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Jiuyu Wang
- Key Laboratory of RNA Biology, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China
| | - Min Wang
- Key Laboratory of RNA Biology, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China
| | - Xinzheng Zhang
- University of Chinese Academy of Sciences, Beijing 100049, China; National Laboratory of Biomacromolecules, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China; Center for Biological Imaging, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China.
| | - Yanli Wang
- Key Laboratory of RNA Biology, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China; University of Chinese Academy of Sciences, Beijing 100049, China; Collaborative Innovation Center of Genetics and Development, Shanghai 200438, China.
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