1
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Zhang L, Luo S, Fan R, Li R, Li W, Chen S, Lan F, Zhu Y, Ji T, Zhang Y, Li L. Localized Cas12a-based cascade amplification for sensitive and robust detection of APE1. Talanta 2024; 280:126773. [PMID: 39197313 DOI: 10.1016/j.talanta.2024.126773] [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: 06/24/2024] [Revised: 07/30/2024] [Accepted: 08/24/2024] [Indexed: 09/01/2024]
Abstract
APE1, an essential enzyme for DNA repair, is overexpressed in various cancers and has been identified as a potential biomarker for cancer diagnosis. However, detecting APE1 at low expression levels in the early stage of cancer presents a significant obstacle. Here, we introduced a novel localized Cas12a-based cascade amplification (LCas12a-CA) method. This method confined both the terminal deoxynucleotidyl transferase and the crRNA/Cas12a complex onto the surfaces of gold nanoparticles (AuNPs). This confinement not only boosts the stability of the multiple enzymes but also induces a substrate channeling effect. As a result, it significantly accelerates the reaction rate and enhances the sensitivity of APE1 detection. Upon the addition of APE1, the AP sites within the APE1 primer can be recognized and cleaved by APE1, exposing the 3'-OH ends. In the presence of LCas12a-CA, polyA sequences are generated at 3'-OH ends with the help of TdT and dATP. The sequences directly enter the Cas12a system, activating the trans-cleavage activity of Cas12a, thereby cutting the reporters on the surface of AuNPs and releasing fluorescence. Our platform demonstrates a detection limit (LOD) as low as 2.51 × 10-6 U/mL, which is more than 60 times lower than that of free Cas12a-CA. Furthermore, the LCas12a-CA exhibits enhanced resistance ability in extreme environments and has been proven effective for the detection of APE1 in clinical samples. Overall, this work offers a promising platform for robust biosensing in cancer diagnosis and prognosis.
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Affiliation(s)
- Lifeng Zhang
- School of Medical Technology, Guangdong Medical University, Dongguan, 523808, China; Laboratory Medicine Center, Department of Laboratory Medicine, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, China
| | - Shihua Luo
- Center for Clinical Laboratory Diagnosis and Research, Affiliated Hospital of Youjiang Medical University for Nationalities, Baise, Guangxi, 533000, China; Key Laboratory of Research on Clinical Molecular Diagnosis for High Incidence Diseases in Western Guangxi of Guangxi Higher Education Institutions, Affiliated Hospital of Youjiang Medical University for Nationalities, Baise 533000, Guangxi, China
| | - Rui Fan
- School of Medical Technology, Guangdong Medical University, Dongguan, 523808, China; Laboratory Medicine Center, Department of Laboratory Medicine, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, China
| | - Ruixi Li
- School of Medical Technology, Guangdong Medical University, Dongguan, 523808, China
| | - Wenbin Li
- Laboratory Medicine Center, Department of Laboratory Medicine, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, China
| | - Siting Chen
- Laboratory Medicine Center, Department of Laboratory Medicine, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, China
| | - Fei Lan
- Laboratory Medicine Center, Department of Laboratory Medicine, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, China
| | - Yitong Zhu
- Laboratory Medicine Center, Department of Laboratory Medicine, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, China
| | - Tingting Ji
- Laboratory Medicine Center, Department of Laboratory Medicine, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, China.
| | - Ye Zhang
- Laboratory Medicine Center, Department of Laboratory Medicine, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, China.
| | - Ling Li
- School of Medical Technology, Guangdong Medical University, Dongguan, 523808, China; School of Basic Medical Sciences, Southern Medical University, Guangzhou, 510515, China.
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2
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Zhang Q, Zhao R, Li CC, Zhang Y, Tang C, Luo X, Ma F, Zhang CY. Construction of an Entropy-Driven Dumbbell-Type DNAzyme Assembly Circuit for Lighting Up Uracil-DNA Glycosylase in Living Cells. Anal Chem 2022; 94:13978-13986. [PMID: 36179339 DOI: 10.1021/acs.analchem.2c03223] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Sensitive monitoring of intracellular uracil-DNA glycosylase (UDG) in living cells is essential to understanding the DNA repair pathways and discovery of anticancer drugs. Herein, we demonstrate the construction of an entropy-driven dumbbell-type DNAzyme assembly circuit for lighting up UDG in living cells via the integration of entropy-driven DNA catalysis (EDC) with the DNAzyme biocatalyst. Target UDG excises the damaged uracil base, causing the breakage of detection probe and the release of trigger. The released trigger can initiate the downstream EDC reaction to form two catalytically active DNAzyme units. The resultant dual Mg2+-DNAzyme units serve as the signal transducers to cyclically cleave the fluorophore/quenched-modified reporters, generating an enhanced fluorescence signal. In contrast to the single-layered EDC method with a linear amplification, the proposed doublet EDC-DNAzyme strategy exhibits high signal gain and achieves a detection limit of 8.71 × 10-6 U/mL. Notably, this assay can be performed in one-step manner at room temperature without the requirement of strict temperature control and complicated reaction procedures, and it can further screen the UDG inhibitors, measure kinetic parameters, and discriminate cancer cells from normal cells. Moreover, this strategy can monitor intracellular UDG activity with improved signal gain, and it may be exploited for sensing and imaging of other types of DNA modifying enzymes with the integration of the corresponding detection substrate, providing a facile and robust approach for biological research studies and clinical diagnosis.
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Affiliation(s)
- Qian Zhang
- College of Chemistry, Chemical Engineering and Materials Science, Shandong Normal University, Jinan 250014, China
| | - Ran Zhao
- College of Chemistry, Chemical Engineering and Materials Science, Shandong Normal University, Jinan 250014, China
| | - Chen-Chen Li
- College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
| | - Yan Zhang
- College of Chemistry, Chemical Engineering and Materials Science, Shandong Normal University, Jinan 250014, China
| | - Chunying Tang
- College of Chemistry, Chemical Engineering and Materials Science, Shandong Normal University, Jinan 250014, China
| | - Xiliang Luo
- College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
| | - Fei Ma
- School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, China
| | - Chun-Yang Zhang
- College of Chemistry, Chemical Engineering and Materials Science, Shandong Normal University, Jinan 250014, China
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3
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Kulkarni RS, Greenwood SN, Weiser BP. Assay design for analysis of human uracil DNA glycosylase. Methods Enzymol 2022; 679:343-362. [PMID: 36682870 DOI: 10.1016/bs.mie.2022.07.033] [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: 01/25/2023]
Abstract
Human uracil DNA glycosylase (UNG2) is an enzyme whose primary function is to remove uracil bases from genomic DNA. UNG2 activity is critical when uracil bases are elevated in DNA during class switch recombination and somatic hypermutation, and additionally, UNG2 affects the efficacy of thymidylate synthase inhibitors that increase genomic uracil levels. Here, we summarize the enzymatic properties of UNG2 and its mitochondrial analog UNG1. To facilitate studies on the activity of these highly conserved proteins, we discuss three fluorescence-based enzyme assays that have informed much of our understanding on UNG2 function. The assays use synthetic DNA oligonucleotide substrates with uracil bases incorporated in the DNA, and the substrates can be single-stranded, double-stranded, or form other structures such as DNA hairpins or junctions. The fluorescence signal reporting uracil base excision by UNG2 is detected in different ways: (1) Excision of uracil from end-labeled oligonucleotides is measured by visualizing UNG2 reaction products with denaturing PAGE; (2) Uracil excision from dsDNA substrates is detected in solution by base pairing uracil with 2-aminopurine, whose intrinsic fluorescence is enhanced upon uracil excision; or (3) UNG2 excision of uracil from a hairpin molecular beacon substrate changes the structure of the substrate and turns on fluorescence by relieving a fluorescence quench. In addition to their utility in characterizing UNG2 properties, these assays are being adapted to discover inhibitors of the enzyme and to determine how protein-protein interactions affect UNG2 function.
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Affiliation(s)
- Rashmi S Kulkarni
- Department of Molecular Biology, Rowan University School of Osteopathic Medicine, Stratford, NJ, United States
| | - Sharon N Greenwood
- Department of Molecular Biology, Rowan University School of Osteopathic Medicine, Stratford, NJ, United States
| | - Brian P Weiser
- Department of Molecular Biology, Rowan University School of Osteopathic Medicine, Stratford, NJ, United States.
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4
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Wang Y, Sun W, Wang J, Wang X, Xu Y, Guo Y, Wang Y, Zhang M, Jiang L, Liu S, Huang J. Ultrasensitive Uracil-DNA Glycosylase Activity Assay and Its Inhibitor Screening Based on Primer Remodeling Jointly via Repair Enzyme and Polymerase. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:3868-3875. [PMID: 35298179 DOI: 10.1021/acs.langmuir.2c00115] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
The development of isothermal nucleic acid amplification techniques has great significance for highly sensitive biosensing in modern biology and biomedicine. A facile and robust exponential rolling circle amplification (RCA) strategy is proposed based on primer-remodeling amplification jointly via a repair enzyme and polymerase, and uracil-DNA glycosylase (UDG) is selected as a model analyte. Two kinds of complexes, complex I and complex II, are preprepared by hybridizing a circular template (CT) with a uracil-containing hairpin probe and tetrahydrofuran abasic site mimic (AP site)-embedded fluorescence-quenched probe (AFP), respectively. The target UDG specifically binds to complex I, resulting in the generation of an AP site, followed by cleavage via endonuclease IV (Endo IV) and the successive trimming of unmatched 3' terminus via phi29 DNA polymerase, thus producing a useable primer-CT complex that actuates the primary RCA. Then, numerous complex II anneal with the first-generation RCA product (RP), generating a complex II-RP assembly containing AP sites within the DNA duplex. With the aid of Endo IV and phi29, AFP, as a pre-primer in complex II, is converted into a mature primer to initiate additional rounds of RCA. So, countless AFPs are cleaved, releasing remarkably strong fluorescent signals. The biosensor is demonstrated to enable rapid and accurate detection of the UDG activity with an improved detection limit as low as 4.7 × 10-5 U·mL-1. Moreover, this biosensor is successfully applied for UDG inhibitor screening and complicated biological samples analysis. Compared to the previous exponential RCA methods, our proposed strategy offers additional advantages, including excellent stability, optional design of CT, and simplified operating steps. Therefore, this proposed strategy may create a useful and practical platform for ultrasensitive detection of low levels of analytes in clinical diagnosis and fundamental biomedicine research.
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Affiliation(s)
- Yu Wang
- School of Biological Sciences and Technology, University of Jinan, Jinan 250022, P. R. China
| | - Wenyu Sun
- School of Biological Sciences and Technology, University of Jinan, Jinan 250022, P. R. China
| | - Jingfeng Wang
- College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, P. R. China
| | - Xu Wang
- Shandong Institute of Metrology and Science, Jinan 250014, P. R. China
| | - Yicheng Xu
- School of Biological Sciences and Technology, University of Jinan, Jinan 250022, P. R. China
| | - Yuanzhen Guo
- School of Biological Sciences and Technology, University of Jinan, Jinan 250022, P. R. China
| | - Yeru Wang
- School of Biological Sciences and Technology, University of Jinan, Jinan 250022, P. R. China
| | - Manru Zhang
- School of Water Conservancy and Environment, University of Jinan, Jinan 250022, P. R. China
| | - Long Jiang
- School of Water Conservancy and Environment, University of Jinan, Jinan 250022, P. R. China
| | - Su Liu
- School of Water Conservancy and Environment, University of Jinan, Jinan 250022, P. R. China
| | - Jiadong Huang
- School of Biological Sciences and Technology, University of Jinan, Jinan 250022, P. R. China
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5
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Sun Y, Zang L, Lu J. Base excision-initiated terminal deoxynucleotide transferase-assisted amplification for simultaneous detection of multiple DNA glycosylases. Anal Bioanal Chem 2022; 414:3319-3327. [DOI: 10.1007/s00216-022-03978-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2022] [Revised: 02/08/2022] [Accepted: 02/14/2022] [Indexed: 11/30/2022]
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6
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Development of the DNA-based biosensors for high performance in detection of molecular biomarkers: More rapid, sensitive, and universal. Biosens Bioelectron 2022; 197:113739. [PMID: 34781175 PMCID: PMC8553638 DOI: 10.1016/j.bios.2021.113739] [Citation(s) in RCA: 20] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2021] [Accepted: 10/25/2021] [Indexed: 02/07/2023]
Abstract
The molecular biomarkers are molecules that are closely related to specific physiological states. Numerous molecular biomarkers have been identified as targets for disease diagnosis and biological research. To date, developing highly efficient probes for the precise detection of biomarkers has become an attractive research field which is very important for biological and biochemical studies. During the past decades, not only the small chemical probe molecules but also the biomacromolecules such as enzymes, antibodies, and nucleic acids have been introduced to construct of biosensor platform to achieve the detection of biomarkers in a highly specific and highly efficient way. Nevertheless, improving the performance of the biosensors, especially in clinical applications, is still in urgent demand in this field. A noteworthy example is the Corona Virus Disease 2019 (COVID-19) that breaks out globally in a short time in 2020. The COVID-19 was caused by the virus called SARS-CoV-2. Early diagnosis is very important to block the infection of the virus. Therefore, during these months scientists have developed dozens of methods to achieve rapid and sensitive detection of the virus. Nowadays some of these new methods have been applied for producing the commercial detection kit and help people against the disease worldwide. DNA-based biosensors are useful tools that have been widely applied in the detection of molecular biomarkers. The good stability, high specificity, and excellent biocompatibility make the DNA-based biosensors versatile in application both in vitro and in vivo. In this paper, we will review the major methods that emerged in recent years on the design of DNA-based biosensors and their applications. Moreover, we will also briefly discuss the possible future direction of DNA-based biosensors design. We believe this is helpful for people interested in not only the biosensor field but also in the field of analytical chemistry, DNA nanotechnology, biology, and disease diagnosis.
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7
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Song X, Ding Q, Zhang J, Sun R, Yin L, Wei W, Pu Y, Liu S. Smart Catalyzed Hairpin Assembly-Induced DNAzyme Nanosystem for Intracellular UDG Imaging. Anal Chem 2021; 93:13687-13693. [PMID: 34583508 DOI: 10.1021/acs.analchem.1c03332] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Uracil DNA glycosylase (UDG) is one of the key initiators for the base excision repair pathway. Since abnormal UDG expression is associated with various diseases, sensitive detection of UDG activity is critical for early clinical diagnosis. Here, a smart catalyzed hairpin assembly (CHA)-DNAzyme nanosystem is developed for intracellular UDG imaging by incorporating CHA and DNAzyme onto MnO2 nanosheets. In this strategy, the biodegradable MnO2 nanosheets are employed as nanocarriers for efficiently adsorbing and delivering five DNA probes into cells by endocytosis. Then, the MnO2 nanosheets are degraded by cellular glutathione to release the DNA modules at the same intracellular position. Liberated Mn2+, an indispensable DNAzyme cofactor, was used to promote catalytic cleavage for facilitating the cascade process in cells. Based on the uracil site-recognition and -excision operation of the target UDG, the activated CHA-DNAzyme nanosystem generates lots of DNAzyme-assisted CHA products, turning on the fluorescence resonance energy transfer response. This autocatalytic CHA-DNAzyme nanosystem provides a detectable minimum UDG concentration of 0.23 mU/mL, which is comparable to some reported UDG detection approaches. As a multiple signal amplification strategy, the CHA-DNAzyme nanosystem realizes the UDG imaging in living cells with enhanced sensitivity, indicating great promise in the prediction and diagnosis of early-stage cancer.
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Affiliation(s)
- Xiaolei Song
- Key Laboratory of Environmental Medicine Engineering of Ministry of Education, School of Public Health, Southeast University, Nanjing 210009, PR China
| | - Qin Ding
- Key Laboratory of Environmental Medicine Engineering of Ministry of Education, School of Public Health, Southeast University, Nanjing 210009, PR China
| | - Juan Zhang
- Key Laboratory of Environmental Medicine Engineering of Ministry of Education, School of Public Health, Southeast University, Nanjing 210009, PR China
| | - Rongli Sun
- Key Laboratory of Environmental Medicine Engineering of Ministry of Education, School of Public Health, Southeast University, Nanjing 210009, PR China
| | - Lihong Yin
- Key Laboratory of Environmental Medicine Engineering of Ministry of Education, School of Public Health, Southeast University, Nanjing 210009, PR China
| | - Wei Wei
- Key Laboratory of Environmental Medicine Engineering of Ministry of Education, School of Public Health, Southeast University, Nanjing 210009, PR China.,Jiangsu Engineering Laboratory of Smart Carbon-Rich Materials and Device, School of Chemistry and Chemical Engineering, Southeast University, Nanjing 210009, PR China
| | - Yuepu Pu
- Key Laboratory of Environmental Medicine Engineering of Ministry of Education, School of Public Health, Southeast University, Nanjing 210009, PR China
| | - Songqin Liu
- Jiangsu Engineering Laboratory of Smart Carbon-Rich Materials and Device, School of Chemistry and Chemical Engineering, Southeast University, Nanjing 210009, PR China
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8
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Zhang H, Li F, Wang L, Shao S, Chen H, Chen X. Sensitive homogeneous fluorescent detection of DNA glycosylase by target-triggering ligation-dependent tricyclic cascade amplification. Talanta 2020; 220:121422. [PMID: 32928432 DOI: 10.1016/j.talanta.2020.121422] [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: 04/18/2020] [Revised: 07/09/2020] [Accepted: 07/14/2020] [Indexed: 10/23/2022]
Abstract
Abnormal DNA glycosylases are concerned with the aging process as well as numerous pathologies in humans. Herein, a sensitive fluorescence method utilizing target-induced ligation-dependent tricyclic cascade amplification reaction was developed for the detecting DNA glycosylase activity. The presence of DNA glycosylase triggered the cleavage of damaged base in hairpin substrate, successively activating ligation-dependent strand displacement amplification (SDA) and exponential amplification reaction (EXPAR) for the generation of large amount of reporter probes. The resultant reporter probes bound with the signal probes to form stable dsDNA duplexes. And then the signal probes could be digested circularly in the dsDNA duplexes by T7 exonuclease, leading to the generation of an enhanced fluorescence signal. Due to the high efficiency of tricyclic cascade amplification and the low background signal deriving from the inhibition of nonspecific amplification, this method exhibited a detection limit of 0.14 U/mL and a dynamic range from 0.16 to 8.0 U/mL. Moreover, it could be applied for detecting DNA glycosylase activity in human serum with good selectivity and high sensitivity, and even quantifying other types of enzyme with 5'-PO4 residue cleavage product by rationally designing the corresponding substrate. Importantly, this method could be performed in homogenous solution without any complicated separation steps, providing a new strategy for DNA glycosylase-related biomedical research.
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Affiliation(s)
- Huige Zhang
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, 730000, China
| | - Fengyun Li
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, 730000, China
| | - Lili Wang
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, 730000, China
| | - Shuai Shao
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, 730000, China
| | - Hongli Chen
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, 730000, China.
| | - Xingguo Chen
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, 730000, China
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9
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Integration of magnetic separation and real-time ligation chain reaction for detection of uracil-DNA glycosylase. Anal Bioanal Chem 2020; 413:255-261. [PMID: 33079213 DOI: 10.1007/s00216-020-02997-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2020] [Revised: 09/30/2020] [Accepted: 10/07/2020] [Indexed: 10/23/2022]
Abstract
Uracil-DNA glycosylase (UDG) is a protein enzyme that initiates the base excision repair pathway for maintaining genome stability. Sensitive detection of UDG activity is important in the study of many biochemical processes and clinical applications. Here, a method for detecting UDG is proposed by integrating magnetic separation and real-time ligation chain reaction (LCR). First, a DNA substrate containing uracil base is designed to be conjugated to the magnetic beads. By introducing a DNA complementary to the DNA substrate, the uracil base is recognized and removed by UDG to form an apurinic/apyrimidinic (AP) site. The DNA substrate is then cut off from the AP site by endonuclease IV, releasing a single-strand DNA (ssDNA). After magnetic separation, the ssDNA is retained in the supernatant and then detected by real-time LCR. The linear range of the method is 5 × 10-4 to 5 U/mL with four orders of magnitude, and the detection limit is 2.7 × 10-4 U/mL. In the assay, ssDNA template obtained through magnetic separation can prevent other DNA from affecting the subsequent LCR amplification reaction, which provides a simple, sensitive, specific, and universal way to detect UDG and other repair enzymes. Furthermore, the real-time LCR enables the amplification reaction and fluorescence detection simultaneously, which simplifies the operation, avoids post-contamination, and widens the dynamic range. Therefore, the integration of magnetic separation and real-time LCR opens a new avenue for the detection of UDG and other DNA repair enzymes.
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10
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Zhao H, Hu W, Jing J, Zhang X. One-step G-quadruplex-based fluorescence resonance energy transfer sensing method for ratiometric detection of uracil-DNA glycosylase activity. Talanta 2020; 221:121609. [PMID: 33076139 DOI: 10.1016/j.talanta.2020.121609] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2020] [Revised: 08/20/2020] [Accepted: 08/27/2020] [Indexed: 10/23/2022]
Abstract
Uracil-DNA glycosylase (UDG) is a crucial enzyme in base excision repair (BER) pathway. It can repair the uracil-induced DNA lesions and maintain the integrity of genome. In this paper, we developed a facile and ratiometric strategy for UDG activity detection using fluorescence resonance energy transfer (FRET). One double-stranded DNA (dsDNA) substrate consisting of strand 1 (dual-fluorescent dye-modified G-quadruplex sequence single-stranded DNA (ssDNA)), carboxyfluorescein (FAM) acted as donor and tetramethylrhodamine (TAMRA) as acceptor) and strand 2 (the complementary sequence of strand 1 containing three mismatched bases and three uracil bases) was introduced. When the UDG-catalyzed uracil is removed from dsDNA, the thermo-stability of dsDNA is decreased and the dual-fluorescent dye-modified G-quadruplex sequence ssDNA is released. Then, the ssDNA transforms into a G-quadruplex comformation, which brings the labeled FAM and TAMRA into close proximity, resulting in a strong FRET signal. In the absence of UDG, the relatively stable dsDNA separates the labeled FAM and TAMRA, giving a weak FRET signal. Thus, by measuring the system fluorescence intensity and exploiting FRET signal difference, UDG activity can be detected in a simple process. The detection limit is 0.087 U/mL without requiring additional signal amplification process. Besides, our developed strategy can also be used for screening the UDG inhibitors in a ratiometric fluorescence detection way.
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Affiliation(s)
- Hengzhi Zhao
- Key Laboratory of Cluster Science of Ministry of Education, Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion Materials, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing, 100081, PR China
| | - Wei Hu
- Key Laboratory of Cluster Science of Ministry of Education, Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion Materials, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing, 100081, PR China
| | - Jing Jing
- Key Laboratory of Cluster Science of Ministry of Education, Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion Materials, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing, 100081, PR China
| | - Xiaoling Zhang
- Key Laboratory of Cluster Science of Ministry of Education, Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion Materials, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing, 100081, PR China.
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11
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A tri-functional probe mediated exponential amplification strategy for highly sensitive detection of Dnmt1 and UDG activities at single-cell level. Anal Chim Acta 2020; 1103:164-173. [DOI: 10.1016/j.aca.2019.12.058] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2019] [Revised: 11/22/2019] [Accepted: 12/19/2019] [Indexed: 11/18/2022]
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12
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Gao W, Xu J, Lian G, Wang X, Gong X, Zhou D, Chang J. A novel analytical principle using AP site-mediated T7 RNA polymerase transcription regulation for sensing uracil-DNA glycosylase activity. Analyst 2020; 145:4321-4327. [DOI: 10.1039/d0an00509f] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
udgactivity could regulateT7 RNApolymerase transcription ability by the heteroduplex substrates with chemical modifications.
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Affiliation(s)
- Weichen Gao
- School of Life Sciences
- Tianjin University and Tianjin Engineering Center of Micro-Nano Biomaterials and Detection-Treatment Technology (Tianjin)
- Tianjin 300072
- China
| | - Jin Xu
- Tianjin Hospital
- Tianjin 300211
- China
| | - Guowei Lian
- School of Life Sciences
- Tianjin University and Tianjin Engineering Center of Micro-Nano Biomaterials and Detection-Treatment Technology (Tianjin)
- Tianjin 300072
- China
| | - Xiaojun Wang
- Department of Toxicology
- Tianjin Centers for Disease Control and Prevention
- Tianjin 300011
- China
| | - Xiaoqun Gong
- School of Life Sciences
- Tianjin University and Tianjin Engineering Center of Micro-Nano Biomaterials and Detection-Treatment Technology (Tianjin)
- Tianjin 300072
- China
| | - Dianming Zhou
- Department of Toxicology
- Tianjin Centers for Disease Control and Prevention
- Tianjin 300011
- China
| | - Jin Chang
- School of Life Sciences
- Tianjin University and Tianjin Engineering Center of Micro-Nano Biomaterials and Detection-Treatment Technology (Tianjin)
- Tianjin 300072
- China
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13
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Dong L, Zhang X, Li Y, E F, Zhang J, Cheng Y. Highly Sensitive Detection of Uracil-DNA Glycosylase Activity Based on Self-Initiating Multiple Rolling Circle Amplification. ACS OMEGA 2019; 4:3881-3886. [PMID: 31459598 PMCID: PMC6648713 DOI: 10.1021/acsomega.8b03376] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/02/2018] [Accepted: 02/08/2019] [Indexed: 06/01/2023]
Abstract
Sensitive detection of uracil-DNA glycosylase (UDG) activity is very important in the study of many fundamental biochemical processes and clinical applications. Here, we develop a novel assay for the detection of UDG activity by using the self-initiating multiple rolling circle amplification (SM-RCA) strategy. We first design a trigger probe modified with NH2 at its 3'-terminal and uracil base in the middle of sequence, which is complementary to a cyclized padlock probe. In the presence of UDG, a uracil base can be excised by UDG to generate an apurinic/apyrimidinic (AP) site. The AP site is recognized and cleaved by endonuclease IV (Endo IV), releasing the primer with 3'-OH. The primer can trigger the rolling circle amplification (RCA) reaction, producing a long and repeated DNA strand embedded some uracil bases. These uracil bases can be cleaved by UDG and Endo IV again, and then, more primers are generated to initiate SM-RCA reaction, producing large amounts of DNA product. Afterward, the DNA product is measured by a specific DNA fluorescence dye for quantitative detection of UDG activity. The linear range of the method is 5 × 10-5 to 1.25 × 10-3 U/mL, and the detection limit is 1.7 × 10-5 U/mL. This method not only utilizes the target UDG itself to trigger RCA but also further induces SM-RCA reaction, providing a simple, sensitive, and cost-effective strategy for the detection of glycosylase and clinical diagnosis.
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Zhang K, Huang W, Huang Y, Wang K, Zhu X, Xie M. Determination of the activity of uracil-DNA glycosylase by using two-tailed reverse transcription PCR and gold nanoparticle-mediated silver nanocluster fluorescence: a new method for gene therapy-related enzyme detection. Mikrochim Acta 2019; 186:181. [PMID: 30771014 DOI: 10.1007/s00604-019-3307-y] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2018] [Accepted: 02/04/2019] [Indexed: 12/28/2022]
Abstract
The authors present a fluorometric method for ultrasensitive determination of the activity of uracil-DNA glycosylase (UDG). It is based on the use of two-tailed reverse transcription-quantitative polymerase chain reaction (RT-qPCR) and an entropy-driven reaction. The assay involves the following steps: (1) UDG-driven uracil excision repair, (2) two-tailed RT-qPCR-mediated amplification, (3) RNA polymerase-aided amplification, and (4) DNA-modified silver nanoclusters (AgNCs) as a transducer to produce a fluorescent signal. UDG enables uracil to be removed from U·A pairs in DNA1 and produces a depurinated/depyrimidinated site that is readily cleaved by endonuclease IV (Endo IV). The cleaved DNA contains the T7 RNA polymerase primer for the T7 RNA polymerase amplification which produces a large number of microRNA sequences. Subsequent two-tailed RT-qPCR leads to the formation of a prolonged DNA termed DNA3. The prolonged part of DNA3 is then hybridized with an added DNA4/DNA5 duplex, where DNA5 is labeled with gold nanoparticles (AuNPs), and DNA 4 is labeled with AgNCs. The AuNPs quench the fluorescence of the AgNCs. The duplex has a toehold to hybridize the prolong part of DNA3. This results in the formation of a DNA5/DNA3 duplex due to strand displacement (by replacing the DNA4 in the DNA4/DNA5 duplex). DNA4 is released and moves away from the AuNPs. This results in restored AgNC fluorescence, best measured at excitation/emission wavelengths of 575/635 nm. The method has a detection limit as low as 0.1 mU mL-1 of UDG activity (3σ criterion) with a range of 0.001-0.01 U mL-1. It was used to measure UDG activity in cell lysates. Conceivably, it may be used to screen for UDG inhibitors such as Ugi. Graphical abstract Schematic presentation of the two-tailed RT-qPCR assay platform for ultrasensitive detection of uracil-DNA glycosylase (UDG). Two-tailed RT-qPCR-mediated amplification and RNA polymerase-aided amplification are utilized for signal amplification. DNA-modified silver nanoclusters (AgNCs) are used as a transducer to produce a fluorescent signal.
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Affiliation(s)
- Kai Zhang
- Key Laboratory of Nuclear Medicine, Ministry of Health, Jiangsu Key Laboratory of Molecular Nuclear Medicine, Jiangsu Institute of Nuclear Medicine, Wuxi, 214063, Jiangsu, China.
| | - Wanting Huang
- Key Laboratory of Nuclear Medicine, Ministry of Health, Jiangsu Key Laboratory of Molecular Nuclear Medicine, Jiangsu Institute of Nuclear Medicine, Wuxi, 214063, Jiangsu, China
| | - Yue Huang
- College of Light Industry and Food Engineering, Nanjing Forestry University, Nanjing, 210037, China
| | - Ke Wang
- Key Laboratory of Nuclear Medicine, Ministry of Health, Jiangsu Key Laboratory of Molecular Nuclear Medicine, Jiangsu Institute of Nuclear Medicine, Wuxi, 214063, Jiangsu, China
| | - Xue Zhu
- Key Laboratory of Nuclear Medicine, Ministry of Health, Jiangsu Key Laboratory of Molecular Nuclear Medicine, Jiangsu Institute of Nuclear Medicine, Wuxi, 214063, Jiangsu, China
| | - Minhao Xie
- Key Laboratory of Nuclear Medicine, Ministry of Health, Jiangsu Key Laboratory of Molecular Nuclear Medicine, Jiangsu Institute of Nuclear Medicine, Wuxi, 214063, Jiangsu, China.
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15
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Du Y, Pan J, Choi JH. A review on optical imaging of DNA nanostructures and dynamic processes. Methods Appl Fluoresc 2019; 7:012002. [PMID: 30523978 DOI: 10.1088/2050-6120/aaed11] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
DNA self-assembly offers a powerful means to construct complex nanostructures and program dynamic molecular processes such as strand displacement. DNA nanosystems pack high structural complexity in a small scale (typically, <100 nm) and span dynamic features over long periods of time, which bring new challenges for characterizations. The spatial and temporal features of DNA nanosystems require novel experimental methods capable of high resolution imaging over long time periods. This article reviews recent advances in optical imaging methods for characterizing self-assembled DNA nanosystems, with particular emphasis on super-resolved fluorescence microscopy. Several advanced strategies are developed to obtain accurate and detailed images of intricate DNA nanogeometries and to perform precise tracking of molecular motions in dynamic processes. We present state-of-the-art instruments and imaging strategies including localization microscopy and spectral imaging. We discuss how they are used in biological studies and biomedical applications, and also provide current challenges and future outlook. Overall, this review serves as a practical guide in optical microscopy for the field of DNA nanotechnology.
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Affiliation(s)
- Yancheng Du
- School of Mechanical Engineering, Purdue University, West Lafayette, IN 47907
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16
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Li XY, Du YC, Pan YN, Su LL, Shi S, Wang SY, Tang AN, Kim K, Kong DM. Dual enzyme-assisted one-step isothermal real-time amplification assay for ultrasensitive detection of polynucleotide kinase activity. Chem Commun (Camb) 2018; 54:13841-13844. [DOI: 10.1039/c8cc08616h] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
A novel, simple, one-step and one-tube detection method for polynucleotide kinase (PNK) activity based on isothermal real-time amplification assay was proposed.
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Affiliation(s)
- Xiao-Yu Li
- State Key Laboratory of Medicinal Chemical Biology
- Tianjin Key Laboratory of Biosensing and Molecular Recognition
- College of Chemistry
- Nankai University
- Tianjin
| | - Yi-Chen Du
- State Key Laboratory of Medicinal Chemical Biology
- Tianjin Key Laboratory of Biosensing and Molecular Recognition
- College of Chemistry
- Nankai University
- Tianjin
| | - Yan-Nian Pan
- State Key Laboratory of Medicinal Chemical Biology
- Tianjin Key Laboratory of Biosensing and Molecular Recognition
- College of Chemistry
- Nankai University
- Tianjin
| | - Li-Li Su
- State Key Laboratory of Medicinal Chemical Biology
- Tianjin Key Laboratory of Biosensing and Molecular Recognition
- College of Chemistry
- Nankai University
- Tianjin
| | - Shuo Shi
- State Key Laboratory of Medicinal Chemical Biology
- Tianjin Key Laboratory of Biosensing and Molecular Recognition
- College of Chemistry
- Nankai University
- Tianjin
| | - Si-Yuan Wang
- State Key Laboratory of Medicinal Chemical Biology
- Tianjin Key Laboratory of Biosensing and Molecular Recognition
- College of Chemistry
- Nankai University
- Tianjin
| | - An-Na Tang
- State Key Laboratory of Medicinal Chemical Biology
- Tianjin Key Laboratory of Biosensing and Molecular Recognition
- College of Chemistry
- Nankai University
- Tianjin
| | - Kwangil Kim
- State Key Laboratory of Medicinal Chemical Biology
- Tianjin Key Laboratory of Biosensing and Molecular Recognition
- College of Chemistry
- Nankai University
- Tianjin
| | - De-Ming Kong
- State Key Laboratory of Medicinal Chemical Biology
- Tianjin Key Laboratory of Biosensing and Molecular Recognition
- College of Chemistry
- Nankai University
- Tianjin
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