South Africa's extraordinary genetic diversity could provide scientists with crucial insights into why patients with the same diagnosis respond differently to treatment. The country's population reflects some of the oldest human lineages, as well as centuries of migration and admixture involving African, European, Asian and other ancestries. This diversity is further shaped by differences in nutrition, exposure to infectious diseases, pollution and access to healthcare.
Professor Michael Pepper, director of the Institute for Cellular and Molecular Medicine at the University of Pretoria, says South Africa's diverse population provides a unique opportunity to understand how genetics, environment and disease interact. He uses the example of two sisters diagnosed with diabetes, who may respond differently to the same treatment due to biological factors. Pepper emphasizes the importance of understanding these factors to develop more effective medicines.
Much of modern biomedical knowledge has been built through research involving populations that are relatively genetically homogeneous, particularly in Europe and North America. However, findings from one population do not necessarily translate directly to another. South Africa's genetic diversity could therefore help researchers identify differences in disease risk and treatment response that may otherwise remain hidden.
The country faces a dual burden of infectious diseases such as HIV and tuberculosis, alongside rising rates of cancer, cardiovascular disease and metabolic disorders. Many patients experience more than one of these health challenges, while socio-economic inequality can further influence their health outcomes. Understanding how genetic and environmental differences influence illness could help move medicine towards treatments that are better suited to the people receiving them.
At research centres such as the Institute for Cellular and Molecular Medicine, scientists are studying how genetic variation affects immune responses, cellular repair mechanisms and treatment outcomes. The aim is to advance precision medicine that works across diverse real-world populations, not just narrow genetic groups. This research contributes to UN Sustainable Development Goal 3: Good Health and Well-being.
South Africa's genetic diversity also has value beyond the country's borders. Studying a genetically diverse population can help scientists identify disease mechanisms that may not be apparent in more genetically uniform populations. The University of Pretoria's Institute for Cellular and Molecular Medicine identifies South Africa's genetic heterogeneity and highly admixed population as an important resource for research into disease susceptibility, diagnosis and treatment.
However, the benefits of this research depend on ensuring that diverse students, clinicians and researchers are included in science. Their participation can influence which questions are asked, how findings are interpreted and ultimately who benefits from scientific discoveries. For South Africa, this could mean turning one of its defining characteristics, its biological diversity, into a tool for improving healthcare in a system facing deep inequalities and a growing burden of chronic disease.
Key points
- South Africa's genetic diversity provides a unique opportunity to understand how genetics, environment and disease interact.
- The country's diverse population could help researchers develop more effective medicines tailored to the population's specific needs.
- Understanding genetic and environmental differences could help move medicine towards treatments that are better suited to the people receiving them.
