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Environmental Toxin Causes Heritable Adult-Onset Diseases

A disease you are suffering today could be a result of your great-grandmother being exposed to an environmental toxin during pregnancy – and you may already have passed it along to your children. //

That’s the conclusion reached by researchers at Washington State University, who have found that exposure to an environmental toxin during embryonic development can cause an animal, and almost all of its descendents, to develop adult-onset illnesses such as cancer and kidney disease. Their discovery suggests that toxins may have played a role in the rapid increase in localized geographic areas of diseases that were previously thought to be caused primarily by genetic mutations.

“It’s a new way to think about disease,” said Michael K. Skinner, director of the Center for Reproductive Biology. “If this pans out, it gives us a host of new diagnostic and therapeutic tools.” He said it also underscores the potential long-term hazards of environmental contaminants.

The work is reported in two papers in the September 14 issue of the journal Endocrinology. It builds on the group’s 2005 finding that exposure to a toxin during embryonic development can cause fertility problems in male rats that are passed to later generations.

In the current study, Skinner and a team of WSU researchers exposed pregnant rats to an environmental toxin during the period that the sex of their offspring was being determined. At that stage of development, the genes of the male embryo’s sex cells (future sperm) are uniquely vulnerable to reprogramming.

The researchers used vinclozolin, a fungicide commonly used in vineyards. Vinclozolin belongs to the class of compounds called endocrine disruptors, synthetic chemicals that interfere with the normal functioning of reproductive hormones. Skinner’s group used higher levels of the toxin than are normally present in the environment, but their study raises concerns about the long-term impacts of su
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