5,781 results match your criteria amplification proposed


Absolute Quantification of MicroRNAs in a Single Cell with Chemiluminescence Detection Based on Rolling Circle Amplification on a Microchip Platform.

Anal Chem 2021 Jun 15. Epub 2021 Jun 15.

State Key Laboratory for the Chemistry and Molecular Engineering of Medicinal Resources, Guangxi Normal University, Guilin 541004, China.

The absolute quantification of miRNAs in a single cell allows to better understand the heterogeneity of cells and the relationship between miRNAs and diseases. However, seldom methods for miRNA quantification in a single cell have been reported because the miRNA content in a single cell is very low. Herein, an ultrasensitive chemiluminescence assay strategy based on rolling circle amplification (RCA) on a microchip platform was proposed for the absolute quantification of miRNAs in a single cell. Read More

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An intramolecular catalytic hairpin assembly on a DNA tetrahedron for mRNA imaging in living cells: improving reaction kinetics and signal stability.

Chem Sci 2019 Dec 18;11(7):1985-1990. Epub 2019 Dec 18.

Hunan Provincial Key Laboratory of Materials Protection for Electric Power and Transportation, Hunan Provincial Engineering Research Center for Food Processing of Aquatic Biotic Resources, School of Chemistry and Food Engineering, Changsha University of Science and Technology Changsha 410114 P. R. China

Enzyme-free amplification techniques based on dynamic DNA self-assembly (DDSA) have recently been developed for the detection of mRNA in living cells. However, signal generation in traditional DDSA amplifiers is mainly dependent on the random diffusion of dissociative probes in a bulk solution, which is generally accompanied by poor kinetics and interference from complex biological systems. In this work, a new amplifier based on the design of an intramolecular catalytic hairpin assembly (intra-CHA) is proposed for the FRET imaging of mRNA in living cells. Read More

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December 2019

Target-activated transcription for the amplified sensing of protease biomarkers.

Chem Sci 2020 Feb 10;11(11):2993-2998. Epub 2020 Feb 10.

State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan Provincial Key Laboratory of Biomacromolecular Chemical Biology, Hunan University Changsha 410082 P. R. China

Signal amplification is an effective way to achieve sensitive analysis of biomarkers, exhibiting great promise in biomedical research and clinical diagnosis. Inspired by the transcription process, here we present a versatile strategy that enables effective amplification of proteolysis into nucleic acid signal outputs in a homogeneous system. In this strategy, a protease-activatable T7 RNA polymerase is engineered as the signal amplifier and achieves 3 orders of magnitude amplification in signal gain. Read More

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February 2020

A Janus 3D DNA nanomachine for simultaneous and sensitive fluorescence detection and imaging of dual microRNAs in cancer cells.

Chem Sci 2020 Jul 23;11(32):8482-8488. Epub 2020 Jul 23.

Key Laboratory of Luminescence Analysis and Molecular Sensing (Southwest University), Ministry of Education, College of Chemistry and Chemical Engineering, Southwest University Chongqing 400715 PR China

Herein, a Janus three-dimensional (3D) DNA nanomachine was constructed for the simultaneous and sensitive fluorescence detection and imaging of dual microRNAs (miRNAs) in cancer cells, which could effectively eliminate signal interference in a homogeneous nanoparticle-based 3D DNA nanostructure caused by the proximity of the two different signal probes to achieve accurate co-location in the same position of living cancer cells. In this system, the Janus nanoparticles were synthesized as the carrier for immobilizing two different oligonucleotides on two different functionalized hemispheres of the nanoparticles to form a Janus 3D DNA nanostructure, which could convert trace amounts of miRNA-21 and miRNA-155 targets into massive FAM and Cy5-labeled duplexes to induce two remarkable fluorescence emissions by the catalytic hairpin assembly (CHA) and 3D DNA walker cascade nucleic acid amplification strategy, realizing sensitive detection and imaging of miRNA targets in cancer cells. Impressively, in comparison with current miRNA imaging methods based on nanoparticle assemblies, the proposed strategy could efficiently eliminate "false positive" results obtained in single type miRNA detection and distinctly increase the immobilization concentration of two different signal probes using Janus nanoparticles as the carrier to further enhance fluorescence intensity, resulting in accurate co-location in the same position of living cells. Read More

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Self-preparation system using glucose oxidase-inspired nitroreductase amplification for cascade-responsive drug release and multidrug resistance reversion.

Biomaterials 2021 Jun 1;275:120927. Epub 2021 Jun 1.

College of Pharmaceutical Science, Zhejiang University, 866 Yuhangtang Road, Hangzhou, 310058, People's Republic of China. Electronic address:

Early antitumor therapy is an important determinant of survival in patients with cancer. Utilization of specific pathological states, such as hypoxia, greatly promotes the development of intelligent drug delivery systems (DDSs) for targeted antitumor therapy. However, a slight decrease in oxygen levels in early-stage tumors is not sufficient to trigger hypoxia-responsive drug release. Read More

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A simple and selective electrochemical magneto-assay for sea lice eDNA detection developed with a Quality by Design approach.

Sci Total Environ 2021 Jun 1;791:148111. Epub 2021 Jun 1.

Department of Chemistry "Ugo Schiff", University of Florence, Via della Lastruccia 3, 50019 Sesto Fiorentino, Fi, Italy; "Nanobiosens" Join Lab, University of Florence, Viale Pieraccini 6, 50139 Firenze, Italy. Electronic address:

Environmental DNA (eDNA) is a novel, non-invasive sampling procedure that allows the obtaining of genetic material directly from environmental samples without any evidence of biological sources. The eDNA methodology can greatly benefit from coupling it to reliable, portable and cost-effective tools able to perform decentralized measurements directly at the site of need and in resource-limited settings. Herein, we report a simple method for the selective analysis of eDNA using a magneto-assay with electrochemical detection. Read More

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Application of tetrahedral -deoxyribonucleic acid electrochemistry platform coupling aptazymes and hybridized hairpin reactions for the measurement of extracellular adenosine triphosphate in plants.

Anal Chim Acta 2021 Aug 24;1172:338681. Epub 2021 May 24.

Key Laboratory of Bioelectrochemistry & Environmental Analysis of Gansu Province, Northwest Normal University, Lanzhou, 730070, Gansu, China. Electronic address:

Extracellular ATP (eATP) is an important biological signal transduction molecule. Although a variety of detection methods have been extensively used in ATP sensing and analysis, accurate detection of eATP remains difficult due to its extremely low concentration and spatiotemporal distribution. Here, an eATP measurement strategy based on tetrahedral DNA (T-DNA)-modified electrode sensing platform and hybridization chain reaction (HCR) combined with G-quadruplex/Hemin (G4/Hemin) DNAzyme dual signal amplification is proposed. Read More

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Amplified and label-free electrochemical detection of a protease biomarker by integrating proteolysis-triggered transcription.

Biosens Bioelectron 2021 Jun 5;190:113372. Epub 2021 Jun 5.

State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan Provincial Key Laboratory of Biomacromolecular Chemical Biology, Hunan University, Changsha, 410082, PR China.

Cell-free synthetic biology provides a promising strategy for developing high-performance biosensors by integrating with advanced testing technologies. However, the combination of synthetic biology with electrochemical testing techniques is still underdeveloped. Here, we proposed an electrochemical biosensor for the label-free and ultrasensitive detection of target protease biomarker by coupling a protease-responsive RNA polymerase (PR) for signal amplification. Read More

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Using Artificial Neural Networks to Model Errorsin Biochemical Manipulation of DNA Molecules.

Authors:
Jiaxiang Guo Hao Qi

IEEE/ACM Trans Comput Biol Bioinform 2021 Jun 11;PP. Epub 2021 Jun 11.

In recent years, the non-biological applications of DNA molecules have made considerable progress; most of these applications were performed in vitro, involving biochemical operations such as synthesis, amplification and sequencing. Because errors may occur with specific sequence patterns or experimental instruments, these biochemical operations are not completely reliable. Modeling errors in these biochemical procedures is an interesting research topic. Read More

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Complete genome sequence of hollyhock vein yellowing virus, a novel monopartite begomovirus infecting hollyhock in Pakistan.

Arch Virol 2021 Jun 11. Epub 2021 Jun 11.

Agricultural Biotechnology Division, National Institute for Biotechnology and Genetic Engineering, Faisalabad, Pakistan.

Hollyhock (Alcea rosea, family Malvaceae) is an ornamental plant grown widely in gardens across South Asia. In a bed of ornamental plants near the village of Chakri (Punjab Province, Pakistan) in 2014, hollyhock plants showing two distinct symptom types were identified: yellow vein mosaic and leaf crumple. PCR amplification with universal primers amplified a begomovirus from separate nucleic acid extracts of single plants of each type but amplified a betasatellite only from the plant with the yellow vein mosaic symptoms. Read More

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Liposomal Controlled Release Ag-Activated DNAzyme Cycle Amplification on a 2D Pyrene COF-Based Photocathode for α-Synuclein Immunosensing.

Anal Chem 2021 Jun 11. Epub 2021 Jun 11.

College of Chemistry, Jilin University, Changchun 130012, China.

Ultrasensitive and accurate monitoring of ultralow-level biomarkers is imperiously needed in clinical diagnosis. So far, exploring high-performance photocathodes and developing new sensing strategies have remained central challenges in photoelectrochemical bioassays. Herein, a two-dimensional (2D) pyrene covalent organic framework (COF, PAF-130) is exemplified for the first time as a high-performance photocathode for precise immunosensing of α-synuclein (α-Syn) by integrating a DNAzyme-induced signal cycle amplification strategy with Ag nanoparticles (NPs)-mediated liposomal immunoassay. Read More

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[COVID-19 - The vaccine miracle must include strictness and caution].

Authors:
Henri Agut

Virologie (Montrouge) 2021 Jun 10. Epub 2021 Jun 10.

Professeur honoraire, Paris, France.

Outside of SARS-CoV-2 vaccines, there is little positive outlook for the control of Covid-19 epidemic. Schematically, two antagonistic and extreme strategies have been proposed, zero-covid and herd immunity. Between the two, often oscillating measures, based on medical but also societal and political considerations, have been taken without any major effect on the course of the epidemic. Read More

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Label-free electrochemical homogeneous detection of the depression marker human apolipoprotein A4 based on proximity hybridization triggered rolling circle amplification.

Int J Biol Macromol 2021 Jun 7;183:2305-2313. Epub 2021 Jun 7.

Jiangsu Key Laboratory of New Drug Research and Clinical Pharmacy, School of Pharmacy, Xuzhou Medical University, 221004 Xuzhou, China; Department of Thyroid and Breast Surgery, Affiliated Hospital of Xuzhou Medical University, Xuzhou, China. Electronic address:

In this paper, we developed a label-free homogeneous electrochemical sensor for detection of apolipoprotein A4 based on proximity hybridization triggered rolling circle amplification induced G-quadruplex formation. The presence of apolipoprotein A4 promoted the formation of a proximate complex via the proximity hybridization of the aptamer DNA strands, which unfolded the molecular beacon, the stem part of molecular beacon as a primer to initiate the RCA process. Thus, with the electrochemical indicator hemin selectively intercalated into the multiple G-quadruplexes, a significant electrochemical signal drop is observed, which is dependent on the concentration of the target apolipoprotein A4. Read More

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A novel genomic classification system of gastric cancer via integrating multidimensional genomic characteristics.

Gastric Cancer 2021 Jun 6. Epub 2021 Jun 6.

Department of Surgical Oncology, The First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, 310003, China.

Background: Gastric cancer (GC) is one of the leading causes of cancer deaths with high heterogeneity. There is currently a paucity of clinically applicable molecular classification system to guide precise medicine.

Methods: A total of 70 Chinese patients with GC were included in this study and whole-exome sequencing was performed. Read More

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Fluorescent paper-based DNA sensor using pyrrolidinyl peptide nucleic acids for hepatitis C virus detection.

Biosens Bioelectron 2021 Oct 29;189:113381. Epub 2021 May 29.

Electrochemistry and Optical Spectroscopy Center of Excellence, Department of Chemistry, Faculty of Science, Chulalongkorn University, Pathumwan, Bangkok, 10330, Thailand. Electronic address:

A novel fluorescent paper-based DNA sensor employing a highly specific pyrrolidinyl peptide nucleic acid (acpcPNA) probe was developed for the sensitive and selective detection of hepatitis C virus (HCV). The acpcPNA was covalently immobilized onto partially oxidized cellulose paper via reductive alkylation between the amine and the aldehyde groups. The fluorescence-based detection was performed by monitoring the fluorescence signal response of a fluorescent dye that selectively binds to the single-strand region of the DNA target over the PNA probe employing a custom-made portable fluorescent camera gadget in combination with a smartphone camera. Read More

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October 2021

A sensitive immunosensor based on graphene-PAMAM composites for rapid detection of the CP4-EPSPS protein in genetically modified crops.

Food Chem 2021 Apr 20;361:129901. Epub 2021 Apr 20.

The Biotechnology Research Institute, Shanghai Academy of Agricultural Sciences, Key Laboratory of Agricultural Genetics and Breeding, Shanghai 201106, China; Crops Ecological Environment Security Inspection and Supervision Center (Shanghai), Ministry of Agriculture and Rural Affairs, Shanghai 201106, China; School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai 200240, China. Electronic address:

A simple electrochemical immunosensor based on nitrogen-doped graphene and polyamide-amine (GN-PAM) composites was proposed for the detection of the CP4-EPSPS protein in genetically modified (GM) crops. In this immunosensor, the amplification of the detection signal was realized through antibodies labeled with gold nanoparticles (AuNPs). The electrochemical responses of the immunosensor were linear (R = 0. Read More

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A Compact Sub-W CMOS ECG Amplifier With >10-G Rin, 2.02 NEF, 8.16 PEF and 83.24-dB CMRR.

IEEE Trans Biomed Circuits Syst 2021 Jun 3;PP. Epub 2021 Jun 3.

This paper presents a compact DDA-based fully-differential CMOS instrumentation amplifier dedicated for micro-power ECG monitoring. Only eight transistors are employed to realize a power-efficient current-sharing DDA. A RC network (using MOS pseudo resistors and poly capacitors) forms feedback loops around the DDA creating an ac-only amplification. Read More

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Biomimetic recognition strategy for efficient capture and release of circulating tumor cells.

Mikrochim Acta 2021 Jun 2;188(6):220. Epub 2021 Jun 2.

State Key Laboratory of Pharmaceutical Biotechnology, School of Life Sciences, Nanjing University, Nanjing, 210023, People's Republic of China.

Efficient capture and release of circulating tumor cells play an important role in cancer diagnosis, but the limited affinity of monovalent adhesion molecules in existing capture technologies leads to low capture efficiency, and the captured cells are difficult to be separated. Inspired by the phenomenon that the long tentacles of jellyfish contain multiple adhesion domains and can effectively capture moving food, we have constructed a biomimetic recognition strategy to capture and release tumor cells. In details, gold-coated magnetic nanomaterials ([email protected] NPs) were first prepared and characterized by scanning electron microscopy, UV-vis absorption spectra, and Zeta potential. Read More

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Electrically controllable active plasmonic directional coupler of terahertz signal based on a periodical dual grating gate graphene structure.

Sci Rep 2021 Jun 1;11(1):11431. Epub 2021 Jun 1.

Kotel'nikov Institute of Radio Engineering and Electronics (Saratov Branch), RAS, Saratov, Russia, 410019.

We propose a concept of an electrically controllable plasmonic directional coupler of terahertz signal based on a periodical structure with an active (with inversion of the population of free charge carriers) graphene with a dual grating gate and numerically calculate its characteristics. Proposed concept of plasmon excitation by using the grating gate offers highly effective coupling of incident electromagnetic wave to plasmons as compared with the excitation of plasmons by a single diffraction element. The coefficient which characterizes the efficiency of transformation of the electromagnetic wave into the propagating plasmon has been calculated. Read More

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Simultaneous detection of tumor-related mRNA and miRNA in cancer cells with magnetic SERS nanotags.

Talanta 2021 Sep 24;232:122432. Epub 2021 Apr 24.

The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, Anhui, 230001, China; Anhui Provincial Key Laboratory of Tumor Immunotherapy and Nutrition Therapy, Anhui, Hefei, 230001, China. Electronic address:

The design of simultaneous detection method has broad prospects for cancer diagnosis and prognosis. Herein, we reported a low cost and sensitive SERS sensing platform for simultaneous p21 mRNA and miRNA-21 detection based on duplex-specific nuclease signal amplification (DSNSA) plus multifunctional [email protected] magnetic nanoparticles ([email protected] MNPs). Here, [email protected] MNPs were used as a separation substrate, and [email protected] served as stable and ultrasensitive SERS nanotags. Read More

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September 2021

Spatially localized amplification reaction with accelerated target conversion for sensitive microRNA detection.

Talanta 2021 Sep 28;232:122422. Epub 2021 Apr 28.

School of Chemistry and Chemical Engineering, Southwest University, Chongqing, 400715, China. Electronic address:

Herein, we construct an ingenious spatially localized amplification reaction (SLAR) by colocalizing the entropy-driven reaction (EDR) in a nanometer space, which greatly accelerates target conversion and realizes the sensitive detection of microRNA-21 (miRNA-21). A large number of EDR complex are hybridized with the prefabricated DNA scaffold via a DNA self-assembly strategy to form the SLAR nanoprobe. Target miRNA-21 triggers interval EDR along the long DNA scaffold, resulting in fluorescence recovery with high signal gain because of the fast release of reporter. Read More

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September 2021

Ultrasensitive detection of gene-PIK3CA mutation based on cascaded strand displacement amplification and trans-cleavage ability of CRISPR/Cas12a.

Talanta 2021 Sep 20;232:122415. Epub 2021 Apr 20.

Key Laboratory for Biorheological Science and Technology of Ministry of Education, State and Local Joint Engineering Laboratory for Vascular Implants, Bioengineering College of Chongqing University, Chongqing, 400044, PR China; Chongqing Key Laboratory of Bio-perception & Intelligent Information Processing, School of Microelectronics and Communication Engineering, Chongqing University, Chongqing, 400044, PR China. Electronic address:

Low abundance gene-PIK3CA mutation detection is crucial for the clinical diagnosis and treatment of breast cancer. Here, a fluorescent biosensor which combines cascaded strand displacement amplification (C-SDA) and trans-cleavage ability of CRISPR/Cas12a was established to ultra-sensitively detect gene-PIK3CA mutation. The mutated gene-PIK3CA can combine with complementary sequence to form an intact recognition site for endonuclease FspI. Read More

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September 2021

Quantitative Detection of Strains in Feces Using Strain-Specific Primers.

Microorganisms 2021 May 28;9(6). Epub 2021 May 28.

State Key Laboratory of Food Science and Technology, Jiangnan University, Lihu Road No.1800, Binhu District, Wuxi 214122, China.

We adopted a bioinformatics-based technique to identify strain-specific markers, which were then used to quantify the abundances of three distinct sup. strains in fecal samples of humans and mice. A pangenome analysis of 205 sup. Read More

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Survival-Critical Genes Associated with Copy Number Alterations in Lung Adenocarcinoma.

Cancers (Basel) 2021 May 25;13(11). Epub 2021 May 25.

Center for Cancer Prevention and Drug Development, Department of Medicine, Hematology/Oncology Section, University of Oklahoma Health Sciences Center (OUHSC), Oklahoma City, OK 73104, USA.

Chromosome Instability (CIN) in tumors affects carcinogenesis, drug resistance, and recurrence/prognosis. Thus, it has a high impact on outcomes in clinic. However, how CIN occurs in human tumors remains elusive. Read More

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Molecular Identification of , Parasitoid of the Brown Marmorated Stink Bug, by Species-Specific PCR.

Insects 2021 May 18;12(5). Epub 2021 May 18.

Alson H. Smith Jr. Agricultural Research and Extension Center, Department of Plant Pathology, Physiology, and Weed Science, Virginia Polytechnic Institute and State University, Winchester, VA 22602, USA.

The samurai wasp, (Ashmead), has been proposed as a biocontrol agent against brown marmorated stink bugs (BMSB), due to its ability to parasitize and kill BMSB eggs. However, the wasps' small size makes it challenging for those untrained in morphological identification to determine the wasps' species. To circumvent this problem, a molecular method was created to identify . Read More

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A DNA Repair and Cell Cycle Gene Expression Signature in Pediatric High-Grade Gliomas: Prognostic and Therapeutic Value.

Cancers (Basel) 2021 May 7;13(9). Epub 2021 May 7.

DNA Repair and Chemoresistance, Department of Oncology, Luxembourg Institute of Health, L-1526 Luxembourg, Luxembourg.

Background: Pediatric high-grade gliomas (pHGGs) are the leading cause of mortality in pediatric neuro-oncology, displaying frequent resistance to standard therapies. Profiling DNA repair and cell cycle gene expression has recently been proposed as a strategy to classify adult glioblastomas. To improve our understanding of the DNA damage response pathways that operate in pHGGs and the vulnerabilities that these pathways might expose, we sought to identify and characterize a specific DNA repair and cell-cycle gene expression signature of pHGGs. Read More

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Sensitive and Label-free Detection of Bacteria in Osteomyelitis through Exo III-Assisted Cascade Signal Amplification.

ACS Omega 2021 May 30;6(18):12223-12228. Epub 2021 Apr 30.

Service Centre, Taizhou Hospital of Zhejiang Province, Linhai 317000, China.

Rapid and sensitive pathogenic bacterial identification and isolation from complicated clinical specimens are of great importance for the early diagnosis and prevention of osteomyelitis. Herein, we proposed a novel methicillin-resistant (MRSA) detection strategy through two specially designed streptavidin magnetic bead-based probes, including a capture probe and a report probe. In detail, the capture probe takes the responsibility to specially bind with the surface protein of MRSA and leads to the liberation of the promoter which could subsequently initiate report probe-based signal amplification. Read More

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Length of the Neurogenic Period-A Key Determinant for the Generation of Upper-Layer Neurons During Neocortex Development and Evolution.

Front Cell Dev Biol 2021 13;9:676911. Epub 2021 May 13.

Max Planck Institute of Molecular Cell Biology and Genetics, Max Planck Society (MPG), Munich, Germany.

The neocortex, a six-layer neuronal brain structure that arose during the evolution of, and is unique to, mammals, is the seat of higher order brain functions responsible for human cognitive abilities. Despite its recent evolutionary origin, it shows a striking variability in size and folding complexity even among closely related mammalian species. In most mammals, cortical neurogenesis occurs prenatally, and its length correlates with the length of gestation. Read More

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Accurate nucleic acid quantification in a single sample tube without the need for calibration.

Anal Chim Acta 2021 Jul 3;1167:338599. Epub 2021 May 3.

State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics, National Institute of Diagnostics and Vaccine Development in Infectious Diseases, School of Public Health, Xiamen University, Xiamen, 361102, China; School of Life Sciences, Xiamen University, Xiamen, 361102, China.

Convenient and accurate nucleic acid quantification (NAQ) is crucial to clinical diagnosis, forensic medicine, veterinary medicine and food analysis. However, traditional NAQ relies on the preparation of a laborious, time-consuming and expensive calibration curve, which would also propagate pipette errors through serially dilutions. Besides, traditional NAQ is run in different tubes, which introduces bias from random tube-to-tube variations and is unable to detect inhibitors from biological samples. Read More

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Nearly Perfect Transmissive Subtractive Coloration through the Spectral Amplification of Mie Scattering and Lattice Resonance.

ACS Appl Mater Interfaces 2021 Jun 28;13(22):26299-26307. Epub 2021 May 28.

Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea.

Silicon has been utilized in metasurfaces to produce structural color filters due to its compatibility with mature and cost-effective methods for complementary metal oxide semiconductor devices. In this work, we propose and demonstrate efficiency- and scattering-enhanced structural color filters using all-dielectric metasurfaces made up of engineered hydrogenated amorphous silicon (a-Si:H) nanoblocks. Wavelength-dependent filtering is achieved by Mie scattering as each structure individually supports the electric dipole (ED) and magnetic dipole (MD) resonances. Read More

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