Building robust functionality in synthetic circuits using engineered feedback regulation

The ability to engineer novel functionality within cells, to quantitatively control cellular circuits, and to manipulate the behaviors of populations, has many important applications in biotechnology and biomedicine. These applications are only beginning to be explored. In this review, we advocate the use of feedback control as an essential strategy for the engineering of robust homeostatic control of biological circuits and cellular populations. We also describe recent works where feedback control, implemented in silico or with biological components, was successfully employed for this purpose.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (237 K)Download as PowerPoint slideHighlights► Engineered feedback loops implement elaborate functionality in synthetic circuits. ► The homeostatic potential of feedback loops is under-utilized in synthetic biology. ► Feedback control of engineered or natural cellular functions can be achieved using biological components or in silico regulation. ► Optogenetics and microfluidic technologies are important for implementing in silico control.