Molecules and Cells

Korean Society for Molecular and Cellular Biology (한국분자세포생물학회)
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Cell-SELEX Based Identification of an RNA Aptamer for Escherichia coli and Its Use in Various Detection Formats

  • Dua, Pooja (Global Research Laboratory (GRL) for RNAi Medicine, Department of Chemistry, Sungkyunkwan University (SKKU)) ;
  • Ren, Shuo (Department of Bioengineering, Dongguk University) ;
  • Lee, Sang Wook (Department of Bioengineering, Dongguk University) ;
  • Kim, Joon-Ki (Global Research Laboratory (GRL) for RNAi Medicine, Department of Chemistry, Sungkyunkwan University (SKKU)) ;
  • Shin, Hye-su (Global Research Laboratory (GRL) for RNAi Medicine, Department of Chemistry, Sungkyunkwan University (SKKU)) ;
  • Jeong, OK-Chan (Department of Biomedical Engineering and School of Mechanical Engineering, Inje University) ;
  • Kim, Soyoun (Department of Bioengineering, Dongguk University) ;
  • Lee, Dong-Ki (Global Research Laboratory (GRL) for RNAi Medicine, Department of Chemistry, Sungkyunkwan University (SKKU))
  • Received : 2016.06.07
  • Accepted : 2016.10.18
  • Published : 2016.11.30
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Abstract

Escherichia coli are important indicator organisms, used routinely for the monitoring of water and food safety. For quick, sensitive and real-time detection of E. coli we developed a 2'F modified RNA aptamer Ec3, by Cell-SELEX. The 31 nucleotide truncated Ec3 demonstrated improved binding and low nano-molar affinity to E. coli. The aptamer developed by us out-performs the commercial antibody and aptamer used for E. coli detection. Ec3(31) aptamer based E. coli detection was done using three different detection formats and the assay sensitivities were determined. Conventional Ec3(31)-biotin-streptavidin magnetic separation could detect E. coli with a limit of detection of $1.3{\times}10^6CFU/ml$. Although, optical analytic technique, biolayer interferometry, did not improve the sensitivity of detection for whole cells, a very significant improvement in the detection was seen with the E. coli cell lysate ($5{\times}10^4CFU/ml$). Finally we developed Electrochemical Impedance Spectroscopy (EIS) gap capacitance biosensor that has detection limits of $2{\times}10^4CFU/mL$ of E. coli cells, without any labeling and signal amplification techniques. We believe that our developed method can step towards more complex and real sample application.

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References

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