Is there a genetic link between kidney function and Alzheimer Disease for my family?
You are asking whether your family's kidney function and Alzheimer disease risk could be connected through genetics. Epidemiological studies have shown that people with chronic kidney disease have a higher risk of developing Alzheimer disease. However, a large 2024 genetic study found no overall genetic correlation between kidney function and Alzheimer disease in European or African ancestry populations. This means that the same genes that affect kidney function do not appear to directly increase Alzheimer risk. Still, researchers identified 16 specific genetic regions that may influence both conditions, suggesting some shared biological pathways. For your family, this means that while kidney disease and Alzheimer disease can co-occur, they are likely not inherited together through a common genetic cause.
What the research says
A comprehensive 2024 study analyzed genetic data from nearly 1.5 million people of European ancestry and about 145,000 of African ancestry to look for shared genetic factors between kidney function (measured by estimated glomerular filtration rate) and late-onset Alzheimer disease. The study found no genome-wide genetic correlation, meaning the overall genetic overlap is essentially zero 4. However, when researchers looked at specific genetic regions, they identified 16 pleiotropic loci in Europeans and 6 in African ancestry individuals that may influence both kidney function and Alzheimer risk 4. This suggests that while there is no broad genetic link, there may be a few specific genes that affect both conditions.
Other research has identified specific genes that could connect kidney and brain health. For example, a 2024 study found that a variant of the EphA1 gene (P460L), which is linked to late-onset Alzheimer disease, affects blood-brain barrier function 5. The blood-brain barrier protects the brain, and its dysfunction is also seen in kidney disease. Additionally, a 2026 study found that changes in tryptophan metabolism, which is important for both kidney function and brain health, are associated with Alzheimer pathology 6. These findings suggest that some biological processes may be shared, even if the genetic link is not strong.
It is important to note that the genetic study specifically looked at late-onset Alzheimer disease and kidney function, not early-onset forms. Early-onset Alzheimer disease is often caused by mutations in specific genes like APP, PSEN1, or PSEN2 7. For families with early-onset Alzheimer, the genetic picture is different and more directly inherited.
What to ask your doctor
- Should my family members with kidney disease be monitored for cognitive changes, even if there is no strong genetic link?
- Are there any specific genetic tests that could help assess our combined risk for kidney disease and Alzheimer disease?
- Could managing kidney disease through diet or medication also help reduce Alzheimer risk in our family?
- What lifestyle factors (like blood pressure control or exercise) might lower both kidney and Alzheimer risks?
- If we have a family history of early-onset Alzheimer, should we consider genetic counseling for the known Alzheimer genes?
This question is drawn from common patient questions about Genetics & Precision Medicine and answered using cited medical research. We do not provide individualized advice.