Mohammad Pourhassan‐Moghaddam
Industrial bioprocesses remain constrained by their limited ability to monitor intracellular events in real time. Most rely on external measurements—nutrient or metabolite levels in the culture medium—that provide only delayed and indirect information about the cell’s internal state. Riboswitches, RNA elements that respond to specific small molecules, offer a complementary route to direct intracellular sensing. Acting as genetically encoded biosensors, they bind metabolites with nanomolar-to-micromolar affinity, and ligand binding drives rapid conformational changes in the RNA. When coupled to gene regulatory outputs, riboswitches can, in principle, support dynamic feedback control that allows cells to sense metabolic imbalances and adjust their own metabolism. This Commentary argues that the central opportunity is conceptual: reframing intracellular biosensing as a foundational layer for adaptive, self-regulating cell factories. It distinguishes what riboswitch technology already demonstrates at laboratory scale from what remains a forward-looking vision, and outlines the engineering barriers, specificity, dynamic range, context-dependence, metabolic burden, evolutionary stability, and validation in production settings that must be addressed before autonomous bioprocess control becomes routine. Importantly, the functional response time of such systems is governed not by binding kinetics alone but by transcription, translation and mRNA turnover, a distinction that matters for feedback stability.