PV-See: A novel Escherichia coli-based biosensor for PVC microplastic detection

A high school team proposed an E. coli sensor that would use light to signal a cellular response to PVC microplastics.

Image: Illustrative figure from a related study: Magdy A et al., Scientific reports (2026), CC BY 4.0

Source: BioTreks, written by Holden Benbrook, Oak Park and River Forest High School; Ben Boyd, Oak Park and River Forest High School; Isadora Conour, Oak Park and River Forest High School; Gayatri Gadhvi, Oak Park and River Forest High School; Nathan Kralik, Oak Park and River Forest High School; Audrey J. Latham, Oak Park and River Forest High School; Ava M. Lebovitz, Oak Park and River Forest High School; Keaton Roberts, Oak Park and River Forest High School (October 27, 2026). AI-generated summary by biochip.com, published . Not independently reviewed.

Key takeaways

  • The Oak Park and River Forest High School team proposed an E. coli K12 sensor pairing the katG promoter with the NanoLuc light-producing reporter.
  • The design aims to connect PVC exposure to oxidative stress signaling and measurable light from a NanoLuc-furimazine reaction.
  • The team has not experimentally established that PVC activates this pathway in E. coli.

A student team at Oak Park and River Forest High School has proposed an Escherichia coli-based biosensor that would signal exposure to polyvinyl chloride (PVC) microplastics with light. The design links a bacterial stress-response pathway to a gene for a light-producing protein. It aims to detect not just plastic particles, but a biological response to them. The team has not yet experimentally tested whether PVC activates the sensor.

Why look for a biological signal?

Microplastics are plastic particles less than 5 millimeters long. PVC makes up about 10% of global plastic production, and its particles are found across environmental systems. Existing detection methods, such as Raman imaging and chemical analysis, can identify plastic but often require specialized equipment and do not show how living cells respond to it.

The team’s proposal instead uses bacteria as a kind of cellular alarm. If PVC causes oxidative stress, a form of cellular strain linked to reactive oxygen molecules, the bacteria could switch on a reporter that produces measurable light. That signal would indicate a biological response, rather than simply confirming that plastic is present.

How the proposed sensor would work

The design uses E. coli K12, a well-studied bacterial strain, and a plasmid, a small DNA molecule that can carry engineered genetic instructions. The plasmid would contain the katG promoter, a DNA sequence that can switch on a gene, alongside NanoLuc, the gene for a light-producing protein.

The proposed chain of events works like a smoke alarm: a trigger activates a signal. Here, the team hypothesizes that PVC exposure would increase hydrogen peroxide inside the bacteria. Hydrogen peroxide can activate OxyR, a protein that in turn switches on the katG promoter, leading the cells to produce NanoLuc.

When NanoLuc reacts with its chemical substrate, furimazine, it produces light. The team proposes measuring that light with a luminometer, an instrument that quantifies light output. A stronger signal in PVC-exposed samples than in a water-only control would be consistent with the proposed response.

A design awaiting a key test

The plasmid would use a pUC19 backbone, which includes a gene for ampicillin resistance to help select bacteria that received the plasmid. The design also places the reporter within the lac operon, a bacterial gene system that allows blue-white screening to help distinguish colonies with inserted DNA from those without it.

The central biological link remains a hypothesis. The team bases it on prior findings involving PVC and oxidative stress in other cells, and on evidence connecting the katG pathway to oxidative stress responses. But PVC-specific activation of this pathway in E. coli still needs experimental validation.

Why this matters

If testing confirms the proposed response, the design could offer a way to study how PVC affects living cells, complementing methods that measure particles directly. The team notes that the luminescent version is not ready for clinical research on human exposure. It would first need validation, and further adaptation would be needed for different sample types or uses.

The next step is to build and test the sensor, comparing light output from PVC-exposed bacteria with the control. Those results would show whether the proposed pathway can reliably connect PVC exposure to a measurable signal.

Topics: Biosensors · Infectious diseases

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