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Study finds novel genetic risk factors for kidney disease
Date:5/10/2009

A team of researchers from the United States, the Netherlands and Iceland has identified three genes containing common mutations that are associated with altered kidney disease risk. One of the discovered genes, the UMOD gene, produces Tamm-Horsfall protein, the most common protein in the urine of healthy individuals. Although the Tamm-Horsfall protein has been known for almost 60 years, its functions are not well understood and its relationship to chronic kidney disease risk was not known previously. The findings are published in the May 10 issue of Nature Genetics.

More than 20 million adults in the United States have chronic kidney disease characterized by reduced kidney function or kidney damage. The progression of chronic kidney disease can lead to kidney failure and the need for dialysis or transplantation. In addition, chronic kidney disease increases the risk of cardiovascular diseases, mortality and medication side-effects. Known risk factors for chronic kidney disease include hypertension and diabetes.

The research team conducted genome wide association studies of more than 20,000 people enrolled in four large population-based studies of cardiovascular disease risk factors: Atherosclerosis Risk in Communities (ARIC) Study, the Cardiovascular Health Study, the Framingham Heart Study and the Rotterdam Study. They further replicated their findings in another 20,000 participants. Of more than 2,500,000 genetic variants that were evaluated for each study participant, the researchers found strong statistical evidence supporting three genes, UMOD, SHROOM3, and STC1 as novel risk genes for reduced kidney function and chronic kidney disease.

"Previous research showed that rare mutations in the UMOD gene cause hereditary forms of severe kidney disease. Our research indicates that a common genetic variant with a frequency of 18 percent in populations of European ancestry is associated with about 25 percent lower risk of chronic
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Contact: Tim Parsons
tmparson@jhsph.edu
410-955-7619
Johns Hopkins University Bloomberg School of Public Health
Source:Eurekalert

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