scholarly journals A dual-signal amplification platform for sensitive fluorescence biosensing of leukemia-derived exosomes

Nanoscale ◽  
2018 ◽  
Vol 10 (43) ◽  
pp. 20289-20295 ◽  
Author(s):  
Lin Huang ◽  
Dian-Bing Wang ◽  
Netrapal Singh ◽  
Fang Yang ◽  
Ning Gu ◽  
...  
Keyword(s):  
Signal Amplification ◽  
Rolling Circle Amplification ◽  
Rolling Circle ◽  
Nicking Endonuclease ◽  
Fluorescent Biosensor ◽  
Dual Signal Amplification

We report a rolling circle amplification and nicking endonuclease-assisted dual signal amplification fluorescent biosensor for exosome detection.

scholarly journals MiRNA Detection Using a Rolling Circle Amplification and RNA-Cutting Allosteric Deoxyribozyme Dual Signal Amplification Strategy

Biosensors ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 222
Author(s):  
Chenxin Fang ◽  
Ping Ouyang ◽  
Yuxing Yang ◽  
Yang Qing ◽  
Jialun Han ◽  
...  
Keyword(s):  
Signal Amplification ◽  
Rolling Circle Amplification ◽  
Padlock Probe ◽  
Rolling Circle ◽  
Sensing Platform ◽  
Mirna Detection ◽  
Substrate Cleavage ◽  
Amplification Strategy ◽  
Circular Template ◽  
Dual Signal Amplification

A microRNA (miRNA) detection platform composed of a rolling circle amplification (RCA) system and an allosteric deoxyribozyme system is proposed, which can detect miRNA-21 rapidly and efficiently. Padlock probe hybridization with the target miRNA is achieved through complementary base pairing and the padlock probe forms a closed circular template under the action of ligase; this circular template results in RCA. In the presence of DNA polymerase, RCA proceeds and a long chain with numerous repeating units is formed. In the presence of single-stranded DNA (H1 and H2), multi-component nucleic acid enzymes (MNAzymes) are formed that have the ability to cleave substrates. Finally, substrates containing fluorescent and quenching groups and magnesium ions are added to the system to activate the MNAzyme and the substrate cleavage reaction, thus achieving fluorescence intensity amplification. The RCA–MNAzyme system has dual signal amplification and presents a sensing platform that demonstrates broad prospects in the analysis and detection of nucleic acids.

scholarly journals Recent advances of fluorescent biosensors based on cyclic signal amplification technology in biomedical detection

2021 ◽  
Vol 19 (1) ◽  
Author(s):  
Hongke Qu ◽  
Chunmei Fan ◽  
Mingjian Chen ◽  
Xiangyan Zhang ◽  
Qijia Yan ◽  
...  
Keyword(s):  
Signal Amplification ◽  
Low Cost ◽  
Rolling Circle Amplification ◽  
High Sensitivity ◽  
High Specificity ◽  
Detection Methods ◽  
Research Progress ◽  
Rolling Circle ◽  
Displacement Reactions ◽  
Short Time

AbstractThe cyclic signal amplification technology has been widely applied for the ultrasensitive detection of many important biomolecules, such as nucleic acids, proteins, enzymes, adenosine triphosphate (ATP), metal ions, exosome, etc. Due to their low content in the complex biological samples, traditional detection methods are insufficient to satisfy the requirements for monitoring those biomolecules. Therefore, effective and sensitive biosensors based on cyclic signal amplification technology are of great significance for the quick and simple diagnosis and treatment of diseases. Fluorescent biosensor based on cyclic signal amplification technology has become a research hotspot due to its simple operation, low cost, short time, high sensitivity and high specificity. This paper introduces several cyclic amplification methods, such as rolling circle amplification (RCA), strand displacement reactions (SDR) and enzyme-assisted amplification (EAA), and summarizes the research progress of using this technology in the detection of different biomolecules in recent years, in order to provide help for the research of more efficient and sensitive detection methods. Graphical Abstract

A DNAzyme-mediated target-initiated rolling circle amplification strategy based on microchip platform for the detection of apurinic/apyrimidinic endonuclease 1 at single-cell level

2021 ◽  
Author(s):  
Chunhuan Xu ◽  
Shengyu Chen ◽  
Jingjin Zhao ◽  
Xiaoshu Luo ◽  
Shulin Zhao
Keyword(s):  
Single Cell ◽  
Signal Amplification ◽  
Rolling Circle Amplification ◽  
Single Cell Level ◽  
Cell Level ◽  
Rolling Circle ◽  
Amplification Strategy

A DNAzyme-mediated target-initiated rolling circle signal amplification strategy based on microchip platform was developed for detecting apurinic/apyrimidine endonuclease 1 (APE1) at the single-cell level. This strategy was applied for assay...

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