Translating synthetic gene circuits into the clinic: Challenges, opportunities, and future directions.

Synthetic gene circuits represent a transformative approach in gene- and cell-based therapies, offering dynamic and precise control of therapeutic functions to address the limitations inherent in conventional treatments. Despite significant preclinical advancements, their clinical translation has been predominantly confined to relatively simple circuit designs, with few complex systems progressing into clinical trials. This perspective discusses current clinical applications of synthetic gene circuits, particularly their roles in solid tumor therapy, T cell-mediated immunomodulation, and metabolic disease management. We outline the therapeutic potential of these circuits and address the challenges impeding their clinical applications, including safety, specificity, immunogenicity, and delivery efficiency. To advance translation, we emphasize the importance of the development of humanized animal models, advanced delivery platforms, AI-driven optimization of circuit components, and the strategic selection of clinically target scenarios. Furthermore, we highlight emerging cybergenetics principles-intelligent and programmable genetic control systems-as a cornerstone for future smart living therapeutics and cell-based therapies.