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Amplification-free, sequence-specific 16S rRNA detection at 1 aM.

Bonhye Koo1, Allison M Yorita, Jacob J Schmidt

  • 1Chemical and Biomolecular Engineering Department, University of California, Los Angeles, Los Angeles, CA 90095, USA. hmonbouq@ucla.edu.

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A new conductometric sensor detects specific bacteria like Escherichia coli (E. coli) using nanopore blockage. This amplification-free, optics-free method offers rapid, low-cost bacterial detection in various samples.

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Area of Science:

  • Biosensing
  • Nanotechnology
  • Molecular Diagnostics

Background:

  • Need for rapid, low-cost, species-specific bacterial detection.
  • Limitations of current methods requiring amplification or optics.
  • Importance of detecting low concentrations of bacteria in clinical and environmental samples.

Purpose of the Study:

  • To develop a nucleic acid amplification-free and optics-free platform for sequence-specific bacterial detection.
  • To demonstrate the detection of Escherichia coli (E. coli) 16S rRNA at ultra-low concentrations.
  • To validate the device's specificity against a background of other bacterial RNA.

Main Methods:

  • Utilized a conductometric sensing device with a nanopore in a glass membrane.
  • Employed PNA oligonucleotide probe-polystyrene bead conjugates for sequence-specific binding to target 16S rRNA.
  • Detected bacterial RNA by measuring ionic current blockage in the nanopore.

Main Results:

  • Achieved sequence-specific detection of E. coli 16S rRNA at 1 aM against a 10^6-fold excess of Pseudomonas putida (P. putida) RNA.
  • Demonstrated no false positives with P. putida RNA when configured for E. coli detection.
  • Successfully detected E. coli at 10 CFU mL-1 in a complex background.

Conclusions:

  • The developed nanopore-based sensor provides a simple, rapid, and low-cost method for bacterial detection.
  • The device shows high specificity and sensitivity for target bacterial species.
  • This technology holds potential for portable, low-power systems for bacterial detection in clinical, food, and water samples.