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Exposure to Common Plastic Component BPA Causes Permanent Fertility Defects
The findings were reported in the March issue of Journal of the Federation of American Societies for Experimental Biology (FASEB J.).
Led by Hugh S. Taylor, M.D., professor in the Department of Obstetrics, Gynecology and Reproductive Sciences at Yale, the study is the first to show that BPA exposure permanently affects sensitivity to estrogen.
To reach the conclusion, Taylor and his team used two groups of mice, one exposed to BPA as a fetus during pregnancy and another exposed to a placebo. They examined gene expression and the amount of DNA modification in the uterus. They found that the mice exposed to BPA as a fetus had an exaggerated response to estrogens as adults, long after the exposure to BPA. The genes were permanently programmed to respond excessively to estrogen.
"The DNA in the uterus was modified by loss of methyl groups so that it responded abnormally in adulthood," said Taylor. "The gene expression was permanently epigenetically altered and the uterus became hyper-responsive to estrogens."
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