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Severe kidney disease in blacks linked to genes on two chromosomes

WINSTON-SALEM, N.C. As yet unidentified genes on chromosomes 18 and 3 are linked to severe kidney disease in younger blacks with diabetes, Barry I. Freedman, M.D., reported today at the American Society of Nephrology meeting in San Diego. Freedman, professor and head of the Section on Nephrology at Wake Forest University Baptist Medical Center, said blacks with these genes develop end-stage kidney disease at a much younger age. People with end-stage kidney disease require either regular dialysis or a kidney transplant to survive.

"This is the only report of this type in African-Americans," said Friedman, adding that the genes causing diabetic kidney disease may be the same as those found in some other ethic groups.

Freedman and a team that included eight other Wake Forest investigators studied 171 black families in which at least two siblings had developed kidney disease from type 2 diabetes; 312 individuals already had end-stage kidney disease. On average, diabetes began at age 39.

Using genome scans, the team's first set of analyses identified only weak evidence for the presence of kidney failure genes. But Freedman said that Carl D. Langefeld,. Ph.D., assistant professor of public health sciences (biostatistics) and Stephen S. Rich, Ph.D., professor of public health sciences and neurology, came up with a new way of analyzing the genetic data. "Using their novel analytic techniques allowed us to detect these regions containing kidney failure genes," he said.

The technique involved ranking 216 families by age when diabetes began and looking for linkages. Chromosome 18 emerged in the genomic study in people whose diabetes began at a younger age, while there was virtually no relationship to chromosome 18 in the older people. This indicated, they reported, that susceptibility in the younger group likely was related to the unidentified gene. Finding the region on a chromosome that is linked to a genetic defect is a major st
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Contact: Robert Conn
rconn@wfubmc.edu
336-716-4587
Wake Forest University Baptist Medical Center
14-Nov-2003


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