Kidney failure is a serious condition affecting millions of people worldwide, and for many, a transplant offers the best chance at a healthier life. Yet, in a surprisingly large number of cases, doctors do not know exactly why a person’s kidneys failed in the first place. This uncertainty can make treatment decisions more difficult and raises concerns when selecting healthy individuals as kidney donors. New research is beginning to change this picture by looking deeper—into our genes.
In this study, researchers explored whether genetic testing could help uncover the hidden causes of kidney disease and improve the safety of kidney transplantation. They examined three groups: people who had received kidney transplants, healthy individuals planning to donate a kidney, and donors who later developed kidney problems after donation.
What they found was striking. Nearly one in four transplant recipients had a genetic explanation for their kidney disease. This means that changes in their DNA—often inherited—were responsible for their condition. Even more surprising, in over a third of these cases, the genetic findings actually changed the original diagnosis. In simple terms, many patients had been labeled with one type of kidney disease, but genetic testing revealed a completely different underlying cause. This matters because knowing the exact cause can help doctors choose better treatments and predict how the disease might behave after transplantation.
The study also looked at people donating kidneys, who are usually carefully screened and considered healthy. Among these donors, only a small percentage—about 4%—carried genetic changes linked to kidney disease. This suggests that current screening methods are generally effective at identifying safe donors. However, the picture became more complex when researchers examined donors who later developed kidney problems. In this group, nearly one in five had genetic variants associated with kidney disease. This raises the possibility that some donors may carry hidden risks that only become apparent after donation.
Importantly, the research points toward a more broader approach for genetic testing Kidney transplant recepients while a very risk-stratified approach in living donors for genetic testing. For example, testing may be enormously useful in people with a family history of kidney disease or unclear diagnoses. In such cases, genetic insights can guide decisions about both receiving and donating kidneys, helping to balance safety with fairness.
Overall, the study highlights how genetic testing is transforming kidney medicine. It can reveal hidden causes of disease, correct misdiagnoses, and provide valuable information for both patients and donors. While challenges remain—such as interpreting uncertain genetic findings—the research suggests that carefully applied genetic testing could make kidney transplantation safer and more precise in the future.
Reference
Schott C. et al. Genetic testing in kidney transplantation and living kidney donor risk assessment. Kidney International (2026). https://www.kidney-international.org/article/S0085-2538(26)00234-6/fulltext
