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Effects of environmental toxicants reach down through generations

Date:
March 2, 2012
Source:
Washington State University
Summary:
Scientists have now demonstrated that a variety of environmental toxicants can have negative effects on not just an exposed animal but the next three generations of its offspring. The animal's DNA sequence remains unchanged, but the compounds change the way genes turn on and off -- the epigenetic effect, according to molecular biologists. The researchers saw females reaching puberty earlier, increased rates in the decay and death of sperm cells and lower numbers of ovarian follicles that later become eggs.

A woman spraying pesticides.
Credit: JackF / Fotolia

A Washington State University researcher has demonstrated that a variety of environmental toxicants can have negative effects on not just an exposed animal but the next three generations of its offspring.

The animal's DNA sequence remains unchanged, but the compounds change the way genes turn on and off -- the epigenetic effect studied at length by WSU molecular biologist Michael Skinner and expanded on in the current issue of the online journal PLoS ONE.

While Skinner's earlier research has shown similar effects from a pesticide and fungicide, this is the first to show a greater variety of toxicants -- including jet fuel, dioxin, plastics and the pesticides DEET and permethrin -- promoting epigenetic disease across generations.

"We didn't expect them all to have transgenerational effects, but all of them did," Skinner said. "I thought hydrocarbon would be negative but it was positive too."

This tells researchers that the ability to promote transgenerational disease is "not simply a unique aspect for a unique compound" but a characteristic of many environmental compounds.

Researchers tested a pesticide mixture (permethrin and insect repellant DEET), a plastic mixture (bisphenol A and phthalates), dioxin (TCDD) and a hydrocarbon mixture (jet fuel, JP8).

The field opens new ground in the study of how diseases develop. While toxicologists generally focus on animals exposed to a compound, Skinner's work further demonstrates that diseases can also stem from older, ancestral exposures that are then mediated through epigenetic changes in sperm.

The work also points the way to identify and diagnose exposures through the use of specific epigenetic molecular markers.

"In the future we might be able to use these epigenetic biomarkers to determine your ancestral and personal exposure early in life and to predict your susceptibility to get a disease later in life," Skinner said.

The study was funded by the U.S. Army to study pollutants that troops might be exposed to. Skinner and his colleagues exposed pregnant female rats to relatively high but non-lethal amounts of the compounds and tracked changes in three generations of offspring.

The researchers saw females reaching puberty earlier, increased rates in the decay and death of sperm cells and lower numbers of ovarian follicles that later become eggs. Future studies can use the molecular tools for risk assessment analysis.


Story Source:

The above story is based on materials provided by Washington State University. The original article was written by Eric Sorensen. Note: Materials may be edited for content and length.


Journal Reference:

  1. Mohan Manikkam, Carlos Guerrero-Bosagna, Rebecca Tracey, Md. M. Haque, Michael K. Skinner. Transgenerational Actions of Environmental Compounds on Reproductive Disease and Identification of Epigenetic Biomarkers of Ancestral Exposures. PLoS ONE, 2012; 7 (2): e31901 DOI: 10.1371/journal.pone.0031901

Cite This Page:

Washington State University. "Effects of environmental toxicants reach down through generations." ScienceDaily. ScienceDaily, 2 March 2012. <www.sciencedaily.com/releases/2012/03/120302101821.htm>.
Washington State University. (2012, March 2). Effects of environmental toxicants reach down through generations. ScienceDaily. Retrieved July 28, 2014 from www.sciencedaily.com/releases/2012/03/120302101821.htm
Washington State University. "Effects of environmental toxicants reach down through generations." ScienceDaily. www.sciencedaily.com/releases/2012/03/120302101821.htm (accessed July 28, 2014).

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