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Department of Biochemistry and Molecular Biology [J. K. V. R., N. M.], Institute for Genetic Medicine [J. K. V. R.], and Department of Preventive Medicine [B. E. H., M. C. Y., M. C. P., R. K. R.], University of Southern California/Norris Comprehensive Cancer Center, University of Southern California School of Medicine, Los Angeles, California 90033-1034
Elevated dihydrotestosterone levels have been suggested to increase the risk of prostate cancer. The human SRD5A2 gene encodes the type II steroid 5
-reductase, which converts testosterone to the more bioactive compound dihydrotestosterone. We have determined the distribution of a dinucleotide repeat in low-risk Asian-Americans, high-risk African-Americans, and intermediate-risk non-Hispanic Whites. We found this marker to be more polymorphic than previously reported, with some alleles being specific to African-Americans. Genetic variants of the SRD5A2 gene may play a role in predisposition to prostate cancer and in explaining the substantial racial/ethnic variability in risk.
1 This work was supported by NIH Grants CA17054, CA53890, CA54281, and CA68581.
2 To whom requests for reprints should be addressed, at Department of Biochemistry and Molecular Biology, University of Southern California School of Medicine, 2011 Zonal Avenue, HMR 413, Los Angeles, CA.
Received 7/14/95. Accepted 8/ 4/95.
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