Synthetic Circuit-Driven Expression of Heterologous Enzymes for Disease Detection

Jiang He, Lior Nissim, Ava P. Soleimany, Adina Binder-Nissim, Heather E. Fleming, Timothy K. Lu, Sangeeta N. Bhatia*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


The integration of nanotechnology and synthetic biology could lay the framework for new classes of engineered biosensors that produce amplified readouts of disease states. As a proof-of-concept demonstration of this vision, here we present an engineered gene circuit that, in response to cancer-associated transcriptional deregulation, expresses heterologous enzyme biomarkers whose activity can be measured by nanoparticle sensors that generate amplified detection readouts. Specifically, we designed an AND-gate gene circuit that integrates the activity of two ovarian cancer-specific synthetic promoters to drive the expression of a heterologous protein output, secreted Tobacco Etch Virus (TEV) protease, exclusively from within tumor cells. Nanoparticle probes were engineered to carry a TEV-specific peptide substrate in order to measure the activity of the circuit-generated enzyme to yield amplified detection signals measurable in the urine or blood. We applied our integrated sense-and-respond system in a mouse model of disseminated ovarian cancer, where we demonstrated measurement of circuit-specific TEV protease activity both in vivo using exogenously administered nanoparticle sensors and ex vivo using quenched fluorescent probes. We envision that this work will lay the foundation for how synthetic biology and nanotechnology can be meaningfully integrated to achieve next-generation engineered biosensors.

Original languageAmerican English
Pages (from-to)2231-2242
Number of pages12
JournalACS Synthetic Biology
Issue number9
StatePublished - 17 Sep 2021

Bibliographical note

Publisher Copyright:
© 2021 The Authors. Published by American Chemical Society.


  • activity probes
  • biomarkers
  • cancer
  • nanosensors
  • nanotechnology
  • proteases
  • synthetic biology


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