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Microbial Biosensors

Microbial biosensors are analytical devices that utilize living microbes to detect specific substances through measurable signals. These devices consist of two main components: biosensing organisms and signal-transducing elements. Biosensing organisms, such as Escherichia coli or Saccharomyces cerevisiae, are typically housed in multiwell plates connected to transducers, enabling rapid, real-time detection of target analytes.Signal Generation MechanismWhen a target analyte—such as...

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Biosensor model based on single hairpin structure for highly sensitive detection of multiple targets.

Ruiting Tian1, Weihua Zhao1, Hongbo Li1,2

  • 1College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, P. R. China.

Analytical Methods : Advancing Methods and Applications
|August 23, 2023
PubMed
Summary

This study introduces a universal fluorescence biosensor for detecting multiple DNA sequences. The novel biosensor utilizes lambda exonuclease for enhanced sensitivity and broad applicability in early disease diagnosis.

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Area of Science:

  • Biomedical Engineering
  • Molecular Diagnostics
  • Biochemistry

Background:

  • Nucleic acids serve as critical biomarkers for early disease detection, including cancer and cardiovascular conditions.
  • Genetic testing is a rapidly advancing field with significant implications for personalized medicine.
  • Development of sensitive and specific biosensors is crucial for effective disease diagnosis.

Purpose of the Study:

  • To design and validate a universal fluorescence biosensor capable of detecting multiple DNA sequences.
  • To leverage enzymatic activity for enhanced sensitivity and a targeted detection mechanism.
  • To establish the biosensor's potential for early disease diagnosis and genetic analysis.

Main Methods:

  • Design of a universal fluorescence biosensor incorporating a DNA hairpin probe and lambda exonuclease.
  • Utilizing lambda exonuclease for targeted DNA hairpin hydrolysis and subsequent strand displacement reactions.
  • Employing a fluorescence resonance energy transfer (FRET) mechanism where increased distance between fluorophore and quencher upon target binding leads to signal emission.

Main Results:

  • The biosensor demonstrated a low detection limit of 300 fM for target DNA sequences.
  • An excellent linear correlation was observed between fluorescence intensity and target DNA concentration.
  • The biosensor exhibited universal applicability for detecting various gene sequences with a relative standard deviation (RSD) ranging from 1.28% to 2.45%.

Conclusions:

  • The developed universal fluorescence biosensor offers high sensitivity, specificity, and broad applicability for DNA detection.
  • The biosensor shows significant potential for the early diagnosis of diseases through genetic biomarker identification.
  • This platform provides a valuable tool for advancements in fluorescent biosensor design and molecular diagnostics.