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Detecting Anastasis In Vivo by CaspaseTracker Biosensor
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Sensitive and Specific Whole-Cell Biosensor for Arsenic Detection.

Xiaoqiang Jia1,2,3, Rongrong Bu4, Tingting Zhao4

  • 1Department of Biochemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin, China xqjia@tju.edu.cn kang.wu@unh.edu.

Applied and Environmental Microbiology
|April 7, 2019
PubMed
Summary
This summary is machine-generated.

We engineered a whole-cell biosensor (WCB) for arsenic detection using a positive feedback amplifier. This enhanced WCB offers improved sensitivity and specificity for detecting arsenic in drinking water.

Keywords:
arsenic resistancepositive feedback amplifiersensitivityspecificitywhole-cell biosensor (WCB)

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Area of Science:

  • Synthetic Biology
  • Environmental Science
  • Biotechnology

Background:

  • Arsenic contamination in drinking water poses a significant global health risk.
  • Existing whole-cell biosensors (WCBs) for arsenic detection often lack sufficient sensitivity and specificity.
  • Developing rapid, sensitive, and specific methods for arsenic monitoring is crucial for public health.

Purpose of the Study:

  • To engineer a novel arsenic WCB with enhanced sensitivity and specificity.
  • To incorporate a genetic positive feedback amplifier into an *Escherichia coli*-based WCB.
  • To evaluate the performance of the engineered WCB for As(III) detection.

Main Methods:

  • Construction of a whole-cell biosensor in *Escherichia coli* DH5α.
  • Integration of a genetic positive feedback amplifier circuit.
  • Quantification of reporter signal (mCherry) in response to varying As(III) concentrations.
  • Assessment of biosensor specificity against other metal ions.

Main Results:

  • The positive feedback amplifier significantly enhanced the reporter signal output.
  • The engineered WCB demonstrated a 1-log higher sensitivity compared to the non-feedback WCB.
  • The minimum detection limit for As(III) was reduced to 0.1 µM, below the WHO guideline.
  • The biosensor exhibited high specificity towards As(III) over other tested metal ions.
  • Faster signal detection was achieved due to signal amplification.

Conclusions:

  • The developed positive feedback amplifier WCB effectively detects As(III) with high sensitivity and specificity.
  • Genetic circuit engineering, specifically positive feedback loops, is a powerful strategy to improve WCB performance.
  • This engineered biosensor offers a promising tool for rapid, *in situ* monitoring of arsenic in drinking water.