Biotechnology Bulletin ›› 2018, Vol. 34 ›› Issue (9): 55-69.doi: 10.13560/j.cnki.biotech.bull.1985.2018-0278

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Research Progress on Exonuclease III-assisted Functional Nucleic Acid Biosensors

SONG Huan, LUO Yun-bo, XU Wen-tao   

  1. 1. Beijing Advanced Innovation Center for Food Nutrition and Human Health,College of Food Science and Nutritional Engineering,China Agricultural University,Beijing 100083;
    2. Key Laboratory of Safety Assessment of Genetically Modified Organism(Food Safety),Ministry of Agriculture,Beijing 100083
  • Received:2018-03-27 Online:2018-09-26 Published:2018-10-10

Abstract:

Exonuclease III(Exo III)is a kind of nuclease that can specifically recognize dsDNA and catalyze the release of mononucleotides by stepwise hydrolysis from 3'-hydroxyl termini of dsDNA strands;while hydrolysis on ssDNA is limited. Based on its exonuclease activity,Exo III has been successfully employed for amplified detection of DNAs,small molecules and metal ions while combined with a series of signal outputs. Here we mainly give a detailed classifying description of the Exo III-assisted biosensors based on various target substances,and also expound the working principles and sensitivity of each sensor. In addition,we discuss the recent progresses on the integration of Exo III-assisted target-recycling strategy with other signal enhancement strategies or emerging nanomaterials in detail as well. Finally,we summarize the advantages and disadvantages of the Exo III-assisted biosensors and prospect the future development,which will be conducive to further application and continuous development of Exo III-assisted biosensors in environmental management,biological analysis and clinical diagnosis.

Key words: exonuclease III, functional nucleic acid, signal amplification, biosensor