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Journal of Integrative Agriculture  2014, Vol. 13 Issue (5): 1121-1129    DOI: 10.1016/S2095-3119(14)60766-8
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In vitro Selection of DNA Aptamers and Fluorescence-Based Recognition for Rapid Detection Listeria monocytogenes
 LIU Guo-qing, LIAN Ying-qi, GAO Chao, YU Xiao-feng, ZHU Ming, ZONG Kai, CHEN Xuejiao
1、School of Biotechnology and Food Engineering, Hefei University of Technology, Hefei 230009, P.R.China
2、Anhui Entry-Exit Inspection and Quarantine Bureau, Hefei 230022, P.R.China
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摘要  Aptamers are specific nucleic acid sequences that can bind to a wide range of nucleic acid and non-nucleic acid targets with high affinity and specificity. Nucleic acid aptamers are selected in vitro from single stranded DNA or RNA ligands containing random sequences of up to a few hundred nucleotides. Systematic evolution of ligands by exponential enrichment (SELEX) was used to select and PCR amplify DNA sequences (aptamers) capable of binding to and detecting Listeria monocytogenes, one of the major food-borne pathogens. A simplified affinity separation approach was employed, in which L. monocytogenes in exponential (log) phase of growth was used as the separation target. A fluorescently-labeled aptamer assay scheme was devised for detecting L. monocytogenes. This report described a novel approach to the detection of L. monocytogenes using DNA aptamers. Aptamers were developed by nine rounds of SELEX. A high affinity aptamer was successfully selected from the initial random DNA pool, and its secondary structure was also investigated. One of aptamers named e01 with the highest affinity was further tested in aptamer-peroxidase and aptamer-fluorescence staining protocols. This study has proved the principle that the whole-cell SELEX could be a promising technique to design aptamer-based molecular probes for dectection of pathogenic microorganisms without tedious isolation and purification of complex markers or targets.

Abstract  Aptamers are specific nucleic acid sequences that can bind to a wide range of nucleic acid and non-nucleic acid targets with high affinity and specificity. Nucleic acid aptamers are selected in vitro from single stranded DNA or RNA ligands containing random sequences of up to a few hundred nucleotides. Systematic evolution of ligands by exponential enrichment (SELEX) was used to select and PCR amplify DNA sequences (aptamers) capable of binding to and detecting Listeria monocytogenes, one of the major food-borne pathogens. A simplified affinity separation approach was employed, in which L. monocytogenes in exponential (log) phase of growth was used as the separation target. A fluorescently-labeled aptamer assay scheme was devised for detecting L. monocytogenes. This report described a novel approach to the detection of L. monocytogenes using DNA aptamers. Aptamers were developed by nine rounds of SELEX. A high affinity aptamer was successfully selected from the initial random DNA pool, and its secondary structure was also investigated. One of aptamers named e01 with the highest affinity was further tested in aptamer-peroxidase and aptamer-fluorescence staining protocols. This study has proved the principle that the whole-cell SELEX could be a promising technique to design aptamer-based molecular probes for dectection of pathogenic microorganisms without tedious isolation and purification of complex markers or targets.
Keywords:  aptamers       systematic evolution of ligands by exponential enrichment (SELEX)       Listeria monocytogenes       rapid detection  
Received: 19 October 2012   Accepted:
Corresponding Authors:  LIU Guo-qing, E-mail: Liugq_168@163.com     E-mail:  Liugq_168@163.com

Cite this article: 

LIU Guo-qing, LIAN Ying-qi, GAO Chao, YU Xiao-feng, ZHU Ming, ZONG Kai, CHEN Xuejiao. 2014. In vitro Selection of DNA Aptamers and Fluorescence-Based Recognition for Rapid Detection Listeria monocytogenes. Journal of Integrative Agriculture, 13(5): 1121-1129.

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