Synthetic Biology and Genetic Circuits for Personalised Medicine

Synthetic biology has emerged as a transformative discipline that integrates principles from engineering, biology, and computational sciences to design and construct novel biological systems or reprogramme existing ones.A key innovation within this field is the development of genetic circuits-engineered networks of genes and regulatory elements that function analogously to electronic circuits, enabling precise control over cellular behaviour.These advances are particularly impactful in the context of personalised medicine, where tailored therapies are designed to align with individual genetic, environmental, and lifestyle factors.This review explores the design principles of genetic circuits, including promoters, sensors, and logic gates, and examines how modularity and tunability allow for precise therapeutic interventions.Case studies such as SynNotch T cells in cancer immunotherapy and engineered probiotics for gastrointestinal disorders illustrate the clinical potential of synthetic biology.Furthermore, we highlight delivery strategies, including viral and non-viral vectors, and discuss challenges such as immune responses, regulatory oversight, and scalability.Future perspectives emphasise the role of artificial intelligence (AI) in optimising circuit design, as well as biocontainment strategies to ensure safety and public acceptance.Together, these innovations pave the way for dynamic, adaptive, and patient-specific therapies that could redefine the future of precision health care.