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Chen C, Zhao M, Guo J, Kuang X, Chen Z, Wang F. Electrochemical detection of FTO with N 3-kethoxal labeling and MazF cleavage. RSC Adv 2024; 14:25561-25570. [PMID: 39144372 PMCID: PMC11322896 DOI: 10.1039/d4ra03989k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2024] [Accepted: 08/07/2024] [Indexed: 08/16/2024] Open
Abstract
N6-Methyladenosine (m6A) is a prevalent modification in eukaryotic mRNAs and is linked to various human cancers. The fat mass and obesity-associated protein (FTO), a key m6A demethylase, is crucial in m6A regulation, affecting many biological processes and diseases. Detecting FTO is vital for clinical and research applications. Our study leverages the specific cleavage properties of the MazF endoribonuclease to design an electrochemical method with signal amplification guided by streptavidin-horseradish peroxidase (SA-HRP), intended for FTO detection. Initially, the compound N3-kethoxal is employed for its reversible tagging ability, selectively attaching to guanine (G) bases. Subsequently, dibenzocyclooctyne polyethylene glycol biotin (DBCO-PEG4-Biotin), is introduced through a reaction with N3-kethoxal. HRP is then employed to catalyze the redox system to enhance the current response further. A promising linear correlation between the peak current and the FTO concentration was observed within the range of 7.90 × 10-8 to 3.50 × 10-7 M, with a detection limit of 5.80 × 10-8 M. Moreover, this method assessed the FTO inhibitor FB23's inhibitory effect, revealing a final IC50 value of 54.73 nM. This result aligns with the IC50 value of 60 nM obtained through alternative methods and is very close to the values reported in the literature. The study provides reference value for research into obesity, diabetes, cancer, and other FTO-related diseases, as well as for the screening of potential therapeutic drugs.
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Affiliation(s)
- Chen Chen
- School of Pharmaceutical Sciences, Key Laboratory of Combinatorial Biosynthesis and Drug Discovery (MOE), Wuhan University Wuhan 430071 China +86-27-68759850 +86-27-68759829
| | - Mei Zhao
- School of Pharmaceutical Sciences, Key Laboratory of Combinatorial Biosynthesis and Drug Discovery (MOE), Wuhan University Wuhan 430071 China +86-27-68759850 +86-27-68759829
| | - Jingyi Guo
- School of Pharmaceutical Sciences, Key Laboratory of Combinatorial Biosynthesis and Drug Discovery (MOE), Wuhan University Wuhan 430071 China +86-27-68759850 +86-27-68759829
| | - Xia Kuang
- School of Pharmaceutical Sciences, Key Laboratory of Combinatorial Biosynthesis and Drug Discovery (MOE), Wuhan University Wuhan 430071 China +86-27-68759850 +86-27-68759829
| | - Zilin Chen
- School of Pharmaceutical Sciences, Key Laboratory of Combinatorial Biosynthesis and Drug Discovery (MOE), Wuhan University Wuhan 430071 China +86-27-68759850 +86-27-68759829
| | - Fang Wang
- School of Pharmaceutical Sciences, Key Laboratory of Combinatorial Biosynthesis and Drug Discovery (MOE), Wuhan University Wuhan 430071 China +86-27-68759850 +86-27-68759829
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2
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Ma T, Zhang Q, Zhang S, Yue D, Wang F, Ren Y, Zhang H, Wang Y, Wu Y, Liu LE, Yu F. Research progress of human key DNA and RNA methylation-related enzymes assay. Talanta 2024; 273:125872. [PMID: 38471421 DOI: 10.1016/j.talanta.2024.125872] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2023] [Revised: 02/18/2024] [Accepted: 03/03/2024] [Indexed: 03/14/2024]
Abstract
Gene methylation-related enzymes (GMREs) are disfunction and aberrantly expressed in a variety of cancers, such as lung, gastric, and pancreatic cancers and have important implications for human health. Therefore,it is critical for early diagnosis and therapy of tumor to develop strategies that allow rapid and sensitive quantitative and qualitative detection of GMREs. With the development of modern analytical techniques and the application of various biosensors, there are numerous methods have been developed for analysis of GMREs. Therefore, this paper provides a systematic review of the strategies for level and activity assay of various GMREs including methyltransferases and demethylase. The detection methods mainly involve immunohistochemistry, colorimetry, fluorescence, chemiluminescence, electrochemistry, etc. Then, this review also addresses the coordinated role of various detection probes, novel nanomaterials, and signal amplification methods. The aim is to highlight potential challenges in the present field, to expand the analytical application of GMREs detection strategies, and to meet the urgent need for future disease diagnosis and intervention.
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Affiliation(s)
- Tiantian Ma
- College of Public Health, Zhengzhou University, Zhengzhou 450001, China
| | - Qiongwen Zhang
- College of Public Health, Zhengzhou University, Zhengzhou 450001, China
| | - Shuying Zhang
- College of Public Health, Zhengzhou University, Zhengzhou 450001, China
| | - Dan Yue
- College of Public Health, Zhengzhou University, Zhengzhou 450001, China
| | - Fanting Wang
- College of Public Health, Zhengzhou University, Zhengzhou 450001, China
| | - Yujie Ren
- School of Information Management, Zhengzhou University, Zhengzhou 450001, China
| | - Hengmiao Zhang
- School of Information Management, Zhengzhou University, Zhengzhou 450001, China
| | - Yinuo Wang
- Zhengzhou Foreign Language School, Zhengzhou 450001, China
| | - Yongjun Wu
- College of Public Health, Zhengzhou University, Zhengzhou 450001, China
| | - Li-E Liu
- College of Public Health, Zhengzhou University, Zhengzhou 450001, China
| | - Fei Yu
- College of Public Health, Zhengzhou University, Zhengzhou 450001, China.
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3
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Liu MH, Zhao NN, Yu WT, Qiu JG, Jiang BH, Zhang Y, Zhang CY. Construction of a label-free fluorescent biosensor for homogeneous detection of m 6A eraser FTO in breast cancer tissues. Talanta 2024; 272:125784. [PMID: 38364555 DOI: 10.1016/j.talanta.2024.125784] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2023] [Revised: 01/24/2024] [Accepted: 02/12/2024] [Indexed: 02/18/2024]
Abstract
Fat mass and obesity-associated protein (FTO) is a crucial eraser of RNA N6- methyladenosine (m6A) modification, and abnormal FTO expression level is implicated in pathogenesis of numerous cancers. Herein, we demonstrate the construction of a label-free fluorescent biosensor for homogeneous detection of m6A eraser FTO in breast cancer tissues. When FTO is present, it specifically erases the methyl group in m6A, inducing the cleavage of demethylated DNA by endonuclease DpnII and the generation of a single-stranded DNA (ssDNA) with a 3'-hydroxyl group. Subsequently, terminal deoxynucleotidyl transferase (TdT) promotes the incorporation of dTTPs into the ssDNA to obtain a long polythymidine (T) DNA sequence. The resultant long poly (T) DNA sequence can act as a template to trigger hyperbranched strand displacement amplification (HSDA), yielding numerous DNA fragments that may be stained by SYBR Gold to produce an enhanced fluorescence signal. This biosensor processes ultrahigh sensitivity with a detection limit of 1.65 × 10-10 mg/mL (2.6 fM), and it can detect the FTO activity in a single MCF-7 cell. Moreover, this biosensor can screen the FTO inhibitors, evaluate enzyme kinetic parameters, and discriminate the FTO expression levels in the tissues of breast cancer patients and healthy persons.
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Affiliation(s)
- Ming-Hao Liu
- Translational Medicine Center, The First Affiliated Hospital of Zhengzhou University, The Academy of Medical Sciences, Zhengzhou University, Zhengzhou, 450052, Henan, China; College of Chemistry, Chemical Engineering and Materials Science, Shandong Normal University, Jinan, 250014, China; College of Chemistry and Chemical Engineering, Qilu Normal University, Jinan, 250200, China
| | - Ning-Ning Zhao
- College of Chemistry, Chemical Engineering and Materials Science, Shandong Normal University, Jinan, 250014, China
| | - Wan-Tong Yu
- College of Chemistry, Chemical Engineering and Materials Science, Shandong Normal University, Jinan, 250014, China
| | - Jian-Ge Qiu
- Translational Medicine Center, The First Affiliated Hospital of Zhengzhou University, The Academy of Medical Sciences, Zhengzhou University, Zhengzhou, 450052, Henan, China
| | - Bing-Hua Jiang
- Translational Medicine Center, The First Affiliated Hospital of Zhengzhou University, The Academy of Medical Sciences, Zhengzhou University, Zhengzhou, 450052, Henan, China.
| | - Yan Zhang
- College of Chemistry and Chemical Engineering, Qilu Normal University, Jinan, 250200, China.
| | - Chun-Yang Zhang
- School of Chemistry and Chemical Engineering, Southeast University, Nanjing, 211189, China.
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4
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Shen T, Huang X, Zhang Y, Tong Y, Shi Y, Guo J, Zou X, Xu Y, Dai Z. Dephosphorylation Switch DNAzyme-RCA Circuit: A Robust Strategy for the Homogeneous and Reliable Detection of FTO Demethylase. Anal Chem 2024; 96:1686-1692. [PMID: 38118402 DOI: 10.1021/acs.analchem.3c04762] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2023]
Abstract
Fat mass and obesity-associated protein (FTO) plays a crucial role in regulating the dynamic modification of N6-methyladenosine (m6A) in eukaryotic mRNA. Sensitive detection of the FTO level and efficient evaluation of the FTO demethylase activity are of great importance to early cancer diagnosis and anticancer drug discovery, which are currently challenged by limited sensitivity/precision and low throughput. Herein, a robust strategy based on the dephosphorylation switch DNAzyme-rolling circle amplification (RCA) circuit, termed DSD-RCA, is developed for highly sensitive detection of FTO and inhibitor screening. Initially, the catalytic activity of DNAzyme is silenced by engineering with an m6A modification in its catalytic core. Only in the presence of target FTO can the methyl group on DNAzyme be eliminated, resulting in the activation of the catalytic activity of DNAzyme and thus cleaving the hairpin substrate to release numerous primers. Different from the conventional methods that use the downstream cleavage primer with the original 3'-hydroxyl end directly as the RCA primer with the problem of high background signal, which should be compensated by additional separation and wash steps in heterogeneous format, our DSD-RCA assay uses the upstream cleavage primer with a 2',3'-cyclic phosphate terminus at the 3'-end serving as an intrinsically blocked 3' end. Only after a dephosphorylation reaction mediated by T4 polynucleotide kinase can the upstream cleavage primers with a resultant 3'-hydroxyl end be extended by RCA. With the high signal-to-noise ratio and homogeneous property, the proposed platform can sensitively detect FTO with a limit of detection of 31.4 pM, and the relative standard deviations (RSDs %) ranging from 0.8 to 2.0% were much lower than the heterogeneous methods. The DSD-RCA method was applied for analyzing FTO in cytoplasmic lysates from different cell lines and tissues of breast cancer patients and further used for screening FTO inhibitors without the need for separation or cleaning, providing an opportunity for achieving high throughput and demonstrating the potential applications of this strategy in disease diagnostics, drug discovery, and biological applications.
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Affiliation(s)
- Taorong Shen
- School of Chemistry, Sun Yat-Sen University, Guangzhou 510275, China
| | - Xing Huang
- Guangdong Provincial Key Laboratory of Sensing Technology and Biomedical Instrument, School of Biomedical Engineering, Shenzhen Campus of Sun Yat-Sen University, Sun Yat-Sen University, Shenzhen 518107, China
| | - Yanfei Zhang
- Guangdong Provincial Key Laboratory of Sensing Technology and Biomedical Instrument, School of Biomedical Engineering, Shenzhen Campus of Sun Yat-Sen University, Sun Yat-Sen University, Shenzhen 518107, China
| | - Yanli Tong
- Guangdong Provincial Key Laboratory of Sensing Technology and Biomedical Instrument, School of Biomedical Engineering, Shenzhen Campus of Sun Yat-Sen University, Sun Yat-Sen University, Shenzhen 518107, China
| | - Yakun Shi
- Guangdong Provincial Key Laboratory of Sensing Technology and Biomedical Instrument, School of Biomedical Engineering, Shenzhen Campus of Sun Yat-Sen University, Sun Yat-Sen University, Shenzhen 518107, China
| | - Jianhe Guo
- Guangdong Provincial Key Laboratory of Sensing Technology and Biomedical Instrument, School of Biomedical Engineering, Shenzhen Campus of Sun Yat-Sen University, Sun Yat-Sen University, Shenzhen 518107, China
| | - Xiaoyong Zou
- School of Chemistry, Sun Yat-Sen University, Guangzhou 510275, China
| | - Yuzhi Xu
- Scientific Research Center, The Seventh Affiliated Hospital, Sun Yat-Sen University, Shenzhen 518107, China
| | - Zong Dai
- Guangdong Provincial Key Laboratory of Sensing Technology and Biomedical Instrument, School of Biomedical Engineering, Shenzhen Campus of Sun Yat-Sen University, Sun Yat-Sen University, Shenzhen 518107, China
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5
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Tanaka K, Suda A, Uesugi M, Futaki S, Imanishi M. Xanthine derivatives inhibit FTO in an L-ascorbic acid-dependent manner. Chem Commun (Camb) 2023; 59:10809-10812. [PMID: 37599611 DOI: 10.1039/d3cc02484a] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/22/2023]
Abstract
Xanthine derivatives were identified as inhibitors of the N6-methyladenosine (m6A) demethylase activity of fat-mass-and-obesity-associated protein (FTO) by activity-based high-throughput screening using the m6A-sensitive ribonuclease MazF. Pentoxifylline exhibited L-ascorbic acid concentration-dependent inhibitory activity against FTO, an unprecedented mode of inhibition, indicating that L-ascorbic acid is a promising key for designing FTO-specific inhibitors.
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Affiliation(s)
- Kamui Tanaka
- Institute for Chemical Research, Uji, Kyoto 611-0011, Japan.
| | - Akiyo Suda
- Institute for Chemical Research, Uji, Kyoto 611-0011, Japan.
| | - Motonari Uesugi
- Institute for Chemical Research, Uji, Kyoto 611-0011, Japan.
- Institute for Integrated Cell-Material Sciences (WPI-iCeMS), Kyoto University, Uji, Kyoto 611-0011, Japan
- School of Pharmacy, Fudan University, Shanghai 201203, People's Republic of China
| | - Shiroh Futaki
- Institute for Chemical Research, Uji, Kyoto 611-0011, Japan.
| | - Miki Imanishi
- Institute for Chemical Research, Uji, Kyoto 611-0011, Japan.
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Zhang Q, Zhao S, Su C, Han Q, Han Y, Tian X, Li Y, Zhang CY. Construction of a Quantum-Dot-Based FRET Nanosensor through Direct Encoding of Streptavidin-Binding RNA Aptamers for N6-Methyladenosine Demethylase Detection. Anal Chem 2023; 95:13201-13210. [PMID: 37603851 DOI: 10.1021/acs.analchem.3c02149] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/23/2023]
Abstract
N6-Methyladenosine (m6A) demethylases can catalyze the removal of the methyl modification on m6A, and it is closely associated with the occurrence, proliferation, differentiation, and metastasis of malignancies. The m6A demethylases (e.g., fat mass and obesity-associated protein (FTO)) may act as a cancer biomarker and are crucial for anticancer drug screening and early clinical diagnosis. Herein, we demonstrate the construction of a quantum-dot-based Förster resonance energy-transfer (FRET) nanosensor through direct encoding of streptavidin-binding RNA aptamers (SA aptamers) for m6A demethylase detection. This nanosensor employs multiple Cy5-molecule-labeled SA aptamers as the building materials to construct the 605QD-RNA-Cy5 nanoassembly, and it exploits the hinder effect of m6A upon elongation and ligation reactions to distinguish m6A-containing RNA probes from demethylated RNA probes. When m6A demethylase is present, the m6A-containing RNA probes are demethylated to generate the demethylated RNA probes, initiating strand extension and ligation reactions to yield a complete transcription template for SA aptamers. Subsequently, a T7-assisted cascade transcription amplification reaction is activated to transcribe abundant SA aptamers with the incorporation of multiple Cy5 fluorophores. The Cy5-incorporated SA aptamers can self-assembly onto the streptavidin-coated 605QD surface to obtain the 605QD-SA aptamer-Cy5 nanoassemblies, resulting in the generation of distinct FRET signals. This nanosensor exhibits ultrahigh sensitivity and excellent specificity, and it can detect endogenous FTO at the single-cell level. Furthermore, this nanosensor can precisely measure enzyme kinetic parameters, screen m6A demethylase inhibitors, and differentiate the FTO expression between breast cancer patients and healthy individual tissues, offering a versatile platform for clinical diagnostic and drug discovery.
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Affiliation(s)
- Qian Zhang
- College of Chemistry, Chemical Engineering and Materials Science, Shandong Normal University, Jinan 250014, China
| | - Shuangnan Zhao
- College of Chemistry, Chemical Engineering and Materials Science, Shandong Normal University, Jinan 250014, China
| | - Cong Su
- College of Chemistry, Chemical Engineering and Materials Science, Shandong Normal University, Jinan 250014, China
| | - Qian Han
- School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, China
| | - Yun Han
- School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, China
| | - Xiaorui Tian
- College of Chemistry, Chemical Engineering and Materials Science, Shandong Normal University, Jinan 250014, China
| | - Yueying Li
- Henan Institute of Medical and Pharmaceutical Sciences & BGI College, Zhengzhou University, Zhengzhou 450052, China
| | - Chun-Yang Zhang
- College of Chemistry, Chemical Engineering and Materials Science, Shandong Normal University, Jinan 250014, China
- School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, China
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7
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Zhao NN, Liu YZ, Zhang L, Liu W, Zou X, Xu Q, Zhang CY. Construction of Multiple DNAzymes Driven by Single Base Elongation and Ligation for Single-Molecule Monitoring of FTO in Cancer Tissues. Anal Chem 2023; 95:12974-12981. [PMID: 37590447 DOI: 10.1021/acs.analchem.3c02989] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/19/2023]
Abstract
Fat mass and obesity-associated proteins (FTO) play an essential role in the reversible regulation of N6-methyladenosine (m6A) epigenetic modification, and the overexpression of FTO is closely associated with the occurrence of diverse human diseases (e.g., obesity and cancers). Herein, we demonstrate the construction of multiple DNAzymes driven by single base elongation and ligation for the single-molecule monitoring of FTO in cancer tissues. When target FTO is present, the m6A-RNA is specifically demethylated and subsequently acts as a primer to combine with the padlock probe, initiating single-base elongation and ligation reaction to generate a closed template probe. Upon the addition of phi29 DNA polymerase, a rolling circle amplification (RCA) reaction is initiated to produce large numbers of Mg2+-dependent DNAzyme repeats. Subsequently, the DNAzymes cyclically digest the signal probes, liberating numerous Cy5 molecules that can be precisely counted by single-molecule imaging. Taking advantage of the sequence specificity of the polymerase/ligase-mediated gap-filling and ligation as well as the high amplification efficiency of RCA, this biosensor shows excellent specificity and high sensitivity with a detection limit of 5.96 × 10-16 M. It can be applied to screen FTO inhibitors and quantify FTO activity at the single-cell level. Moreover, the proposed strategy can accurately distinguish the FTO expression level in tissues of healthy individuals and breast cancer patients, providing a new platform for drug discovery, m6A modification-related research, and clinical diagnostics.
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Affiliation(s)
- Ning-Ning Zhao
- College of Chemistry, Chemical Engineering and Materials Science, Shandong Normal University, Jinan 250014, China
| | - Ya-Zhen Liu
- College of Chemistry, Chemical Engineering and Materials Science, Shandong Normal University, Jinan 250014, China
| | - Lingfei Zhang
- Center for Disease Control and Prevention of Weihai City, Weihai, 264200, China
| | - Wenjing Liu
- School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, China
| | - Xiaoran Zou
- College of Chemistry, Chemical Engineering and Materials Science, Shandong Normal University, Jinan 250014, China
| | - Qinfeng Xu
- School of Food and Biological Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China
| | - Chun-Yang Zhang
- College of Chemistry, Chemical Engineering and Materials Science, Shandong Normal University, Jinan 250014, China
- School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, China
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Li WX, Jiang S, Liu WJ, Zhang CY. RNA demethylation-driven functional supramolecular structure for label-free detection of m 6A modification eraser FTO in human breast tissues. Anal Chim Acta 2023; 1260:341208. [PMID: 37121657 DOI: 10.1016/j.aca.2023.341208] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2023] [Revised: 03/07/2023] [Accepted: 04/10/2023] [Indexed: 05/02/2023]
Abstract
Fat mass and obesity-associated enzyme (FTO) can dynamically regulate N6-methyladenosine modification, and it is engaged in various cellular functions. Herein, we demonstrate the RNA demethylation-driven functional supramolecular structure for label-free detection of m6A modification eraser FTO in human breast tissues. The presence of FTO catalyzes the removal of methyl group in m6A, causing the cleavage of demethylated DNA by DpnII and the release of DNA primer. The resultant DNA primer hybridizes with circular template to initiate isothermal rolling circle amplification (RCA), producing abundant long ssDNA polymers with repeating sequences of G-quadruplex. Subsequently, N-methylmesoporphyrin IX (NMM) is selectively embedded into G-quadruplex DNAzyme to form a supramolecular NMM-G-quadruplex structure for the generation of an amplified fluorescence signal. Benefiting from high selectivity of DpnII toward demethylated DNA, high amplification efficiency of RCA, and high signal-to-noise ratio of G-quadruplex-NMM system, this assay can sensitively detect FTO with a limit of detection (LOD) of 3.10 × 10-16 M, screen RNA demethylase inhibitors, quantify FTO activity in cancer cells, and discriminate FTO activity between breast cancer patient tissues and healthy person tissues. Importantly, this assay can be homogeneously conducted in a label-free manner, with great potential in RNA demethylases-related pathogenesis research and clinical diagnostics.
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Affiliation(s)
- Wen-Xuan Li
- School of Chemistry and Chemical Engineering, Southeast University, Nanjing, 211189, China
| | - Su Jiang
- College of Chemistry, Chemical Engineering and Materials Science, Shandong Normal University, Jinan, 250014, China
| | - Wen-Jing Liu
- School of Chemistry and Chemical Engineering, Southeast University, Nanjing, 211189, China
| | - Chun-Yang Zhang
- School of Chemistry and Chemical Engineering, Southeast University, Nanjing, 211189, China; College of Chemistry, Chemical Engineering and Materials Science, Shandong Normal University, Jinan, 250014, China.
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9
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Gao H, Song X, Chen Q, Yuan R, Xiang Y. Target-promoted specific activation of m6A-DNAzyme for SPEXPAR-amplified and highly sensitive non-label electrochemical assay of FTO demethylase. Anal Chim Acta 2023; 1247:340902. [PMID: 36781254 DOI: 10.1016/j.aca.2023.340902] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2022] [Revised: 01/17/2023] [Accepted: 01/26/2023] [Indexed: 01/28/2023]
Abstract
The demethylase of fat mass and obesity related protein (FTO) is critical to regulate the dynamic N6-methyladenosine (m6A) modification of eukaryotic mRNAs, and its overexpression has found to be closely related to the initiation of several cancers. On the basis of a target-promoted specific activation of DNAzyme strategy coupled with self-primer exponential amplification reaction (SPEXPAR) cycles and DNA supersandwich assemblies, the highly sensitive and label-free electrochemical FTO assay approach is established. The modification of the catalytic core nucleobase of the DNAzyme probe by m6A can inhibit its cleavage activity. The presence of target FTO catalyzes the elimination of the methyl group to restore the DNAzyme activity, which cleaves the hairpin substrates to trigger the SPEXPAR for yielding many ssDNAs. The capture of these DNAs on the sensor electrode leads to the initiation of supersandwich assembly formation of long dsDNAs. Tremendous electrochemical signal probe of [Ru(NH3)6]Cl3 are then absorbed on these dsDNAs to produce highly amplified catalytic currents with the assistance of K3[Fe(CN)6] for detecting trace FTO with 63.1 fM detection limit. Furthermore, the sensor can be employed for selective assay of FTO in cell lysates, revealing the great potential of this sensing strategy for biomedical and biological study applications.
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Affiliation(s)
- Huahui Gao
- Key Laboratory of Luminescence Analysis and Molecular Sensing, Ministry of Education, School of Chemistry and Chemical Engineering, Southwest University, Chongqing, 400715, PR China
| | - Xinmei Song
- Key Laboratory of Luminescence Analysis and Molecular Sensing, Ministry of Education, School of Chemistry and Chemical Engineering, Southwest University, Chongqing, 400715, PR China
| | - Qirong Chen
- Key Laboratory of Luminescence Analysis and Molecular Sensing, Ministry of Education, School of Chemistry and Chemical Engineering, Southwest University, Chongqing, 400715, PR China
| | - Ruo Yuan
- Key Laboratory of Luminescence Analysis and Molecular Sensing, Ministry of Education, School of Chemistry and Chemical Engineering, Southwest University, Chongqing, 400715, PR China
| | - Yun Xiang
- Key Laboratory of Luminescence Analysis and Molecular Sensing, Ministry of Education, School of Chemistry and Chemical Engineering, Southwest University, Chongqing, 400715, PR China.
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10
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Shi L, Ma X, Xie H, Qin Y, Huang Y, Zhang Y, Sun L, Yang J, Li G. Engineering m 6A demethylation-activated DNAzyme for visually and sensitively sensing fat mass and obesity-associated protein. Biosens Bioelectron 2023; 222:115007. [PMID: 36527832 DOI: 10.1016/j.bios.2022.115007] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2022] [Revised: 12/07/2022] [Accepted: 12/11/2022] [Indexed: 12/15/2022]
Abstract
Fat mass and obesity-associated protein (FTO) regulating the N6-methyladenine (m6A, the most pervasive epigenetic modification) levels within the nucleus has been identified as a potential biomarker for cancer diagnosis and prognosis. However, current methods for FTO detection are complicated or/and not sensitive enough for practical application. Herein, we propose a colorimetric biosensor for detecting FTO based on a delicate design of m6A demethylation-activated DNAzyme. Specifically, an m6A-blocked DNAzyme is constructed as a switch of the biosensor that can be turned on by target FTO. The decreased thermal stability resulting from substrate cleavage leads to a DNAzyme recycling to produce multiple primers. Then the rolling circle amplification (RCA) reactions can be initiated to generate G-quadruplex-DNAzymes catalyzing 2,2-azino-bis-(3-ethylben-zthiazoline-6-sulfonic acid (ABTS) oxidation which can be readily observed by the naked eye. Quantitative detection can also be achieved with a limit of detection (LOD) down to 69.9 fM, exhibiting higher sensitivity than previous reports. Therefore, this biosensor opens a simple and sensitive way to achieve visual assay of FTO via triple signal amplification. In addition, our biosensor has been successfully applied to FTO detection in clinical samples, which shows great potential in clinical molecular diagnostics.
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Affiliation(s)
- Liu Shi
- Center for Molecular Recognition and Biosensing, School of Life Sciences, Shanghai University, Shanghai, 200444, PR China
| | - Xuemei Ma
- State Key Laboratory of Analytical Chemistry for Life Science, School of Life Sciences, Nanjing University, Nanjing, 210023, PR China
| | - Haojie Xie
- State Key Laboratory of Analytical Chemistry for Life Science, School of Life Sciences, Nanjing University, Nanjing, 210023, PR China
| | - Yujia Qin
- Center for Molecular Recognition and Biosensing, School of Life Sciences, Shanghai University, Shanghai, 200444, PR China
| | - Yue Huang
- Department of Food Science and Engineering, College of Light Industry and Food Engineering, Nanjing Forestry University, Nanjing, 210037, PR China
| | - Yuanyuan Zhang
- Department of Obstetrics and Gynecology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, 210029, PR China.
| | - Lizhou Sun
- Department of Obstetrics and Gynecology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, 210029, PR China
| | - Jie Yang
- State Key Laboratory of Analytical Chemistry for Life Science, School of Life Sciences, Nanjing University, Nanjing, 210023, PR China
| | - Genxi Li
- Center for Molecular Recognition and Biosensing, School of Life Sciences, Shanghai University, Shanghai, 200444, PR China; State Key Laboratory of Analytical Chemistry for Life Science, School of Life Sciences, Nanjing University, Nanjing, 210023, PR China.
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