Whole-cell microbial biosensors for detecting persistent organic pollutants

Area of Science:

• Environmental Science
• Biotechnology
• Analytical Chemistry

Background:

• Persistent organic pollutants (POPs) pose significant global environmental and human health risks.
• Traditional laboratory monitoring methods for POPs are often costly and time-consuming.
• Whole-cell biosensors (WCBs) present a promising alternative for POPs detection.

Purpose of the Study:

• To review the development of WCBs for monitoring key POPs: polycyclic aromatic hydrocarbons (PAHs), polychlorinated biphenyls (PCBs), and dioxin-like compounds (DLCs).
• To discuss advancements in enhancing WCB performance and adaptability for environmental monitoring.
• To highlight innovative applications of WCBs in practical environmental surveillance.

Main Methods:

• Engineering of chassis cells through mutation breeding.
• Development and optimization of genetic circuits for WCBs.
• Refinement of reporter systems for enhanced detection sensitivity.

Main Results:

• Engineered WCBs achieve ultra-low detection limits for POPs (e.g., 10 fM for 2,3,7,8-TCDD, 0.06-1 μM for PCBs).
• WCB performance in sensitivity and specificity is comparable or superior to traditional methods.
• Advancements enable WCBs to monitor a range of POPs, including PAHs, PCBs, and DLCs.

Conclusions:

• WCBs offer a viable, cost-effective solution for on-site POPs monitoring.
• Ongoing research is improving WCB sensitivity, adaptability, and application scope.
• Transformative applications like smartphone-based devices demonstrate WCBs' potential to bridge the lab-field gap.