DNA-Based Boolean Logic Gates for Molecular Computation and Biosensing: A Critical Review

DNA-based Boolean logic gates represent a transformative platform in molecular computation, providing a bridge between biological processes. The field has advanced toward sophisticated designs incorporating spatiotemporal control. Distinguished by features such as massive parallelism, biocompatibility, energy efficiency, and programmability, DNA computing enables operations beyond the scope of silicon-based technologies. These qualities have enabled applications in biomedical diagnostics, autonomous biosensing, and therapeutic regulation. Furthermore, multi-layered circuit architectures, including neural network like designs, highlight the transition from basic proofs of concept to practical, application-oriented technologies. Key challenges remain particularly signal leakage, gate stability, scalability, and NOT gate constraints. Emerging solutions, such as photocaging for precise activation, enzyme-mediated processing for higher fidelity, and cost-effective array-based DNA synthesis, have improved reliability and scalability. Integration with artificial intelligence, machine learning, and bioelectronics is further advancing hybrid molecular electronic systems capable of coupling biological recognition with robust digital processing. Future progress depends on standardization, reproducibility, and economic scalability. The development of automated design frameworks, rigorous validation, and cost reduction strategies will be central to driving adoption. With immediate potential in diagnostics and environmental monitoring, DNA logic gates are shaping the foundation of molecular intelligence platforms.