Hierarchical design strategies for tuning genetic circuits.

Abstract

Genetic circuit design is central to synthetic biology, yet achieving predictable and programmable circuit performance remains challenging due to diverse circuit- and host-dependent factors. Thus, a systematic perspective is needed to integrate these factors across multiple design layers. In this review, we establish a hierarchical framework for tuning genetic circuits as an engineering process spanning biological part design, DNA synthesis and assembly, carrier selection, host-cell implementation, and cross-host transfer. We further discuss how each layer contributes to circuit behavior and shapes trade-offs among key performance properties. By integrating hierarchical design strategies with iterative troubleshooting, this review provides a practical roadmap for tuning genetic circuits toward more predictable and reliable performance.

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