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BUSM researchers identify genetic markers for testosterone, estrogen level regulation
Date:7/20/2012

(Boston) A research study led by Boston University School of Medicine (BUSM) and the University of Exeter in the United Kingdom, in collaboration with a global consortium, has identified genetic markers that influence a protein involved in regulating estrogen and testosterone levels in the bloodstream. The results, published online in PLoS Genetics, also reveal that some of the genetic markers for this protein are near genes related to liver function, metabolism and type 2 diabetes, demonstrating an important genetic connection between the metabolic and reproductive systems in men and women.

Andrea D. Coviello, MD, assistant professor of medicine at BUSM and an endocrinologist at Boston Medical Center, is one of the paper's lead authors. This study was done in collaboration with the Framingham Heart Study and investigators from 15 international epidemiologic studies participating in the Cohorts for Heart and Aging Research in Genetic Epidemiology (CHARGE) consortium.

Sex hormone-binding globulin (SHBG) is the key protein that carries testosterone and estrogen in the bloodstream in both men and women. As the main carrier of these sex hormones, SHBG helps to regulate their effects in different tissues and organs in the body. In addition to effects on reproduction in men and women through regulation of sex hormones, SHBG has been linked to many chronic diseases including type 2 diabetes and hormone-sensitive cancers such as breast and prostate.

Previous family studies have demonstrated that approximately 50 percent of the variation in SHBG concentrations in the bloodstream is inherited from parents, suggesting that SHBG levels are under significant genetic control. However, little has been known about the specific genes that influence SHBG levels.

Investigators examined human genomes from 21,791 men and women to determine which genes influence SHBG levels and validated the results from this genome-wide association
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Contact: Jenny Eriksen Leary
jenny.eriksen@bmc.org
617-638-6841
Boston University Medical Center
Source:Eurekalert

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