read about gene-by-environment effects (also called gene x environment or G X E) in the Champagne and Mashoodh (2009) article. The particular example you will examine is epigenetic programming due to variations in maternal care. Specifically, in rodent models, it was found that maternal behavior such as carefully licking and grooming the pups was tied to a decreased stress response and lower levels of exploration fear in the pups. Mothers that displayed low levels of pup licking and grooming had adult offspring with a heightened stress response. This study provided evidence that epigenetic changes can underlie the long-term impact of early life experiences.
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