Bridging human genetics and community medicine: emerging applications for precision public health
Historically, human genetics and community medicine have evolved as separate disciplines. The domain of genetics has been on molecular mechanisms of disease and community medicine has traditionally been on prevention at the population level and health systems. Over the last two decades, advances in genomic technologies, falling sequencing costs and the expansion of large-scale biobanks have made it possible to integrate genetic insights into public health. This convergence has led to the development of precision public health, which seeks to improve disease prevention, risk stratification and health interventions at the population level. Moreover, in countries such as India, the distinct genetic diversity resulting from endogamy and founder effects points to the necessity of population-specific genomic approaches within public health frameworks. This review summarizes the existing evidence for the incorporation of human genetics into community medicine in the following areas: genetic epidemiology, population risk prediction, genetic screening across the life course, infectious disease genomics, pharmacogenomics, and genetic determinants of non-communicable diseases. It shows the potential of tools such as polygenic risk scores, pathogen genome sequencing and pharmacogenomic testing to enhance early detection, targeted prevention and rational therapeutics. The review also discusses the Indian context, with examples of national initiatives such as the Genome, India Project and the National Sickle Cell Elimination Mission as examples of translating genomic science to public health practice. Crucially, it addresses implementation challenges such as ancestry bias, ethical considerations, health system readiness, and the need for culturally sensitive community engagement.