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[From The New York Times]

For years, psychiatrists have known that children who are abused or neglected run a high risk of developing mental problems later in life, from anxiety and depression to substance abuse and suicide.

The connection is not surprising, but it raises a crucial scientific question: Does the abuse cause biological changes that may increase the risk for these problems?

Over the past decade or so, researchers at McGill University in Montreal, led by Michael Meaney, have shown that affectionate mothering alters the expression of genes in animals, allowing them to dampen their physiological response to stress. These biological buffers are then passed on to the next generation: rodents and nonhuman primates biologically primed to handle stress tend to be more nurturing to their own offspring, Dr. Meaney and other researchers have found.

Now, for the first time, they have direct evidence that the same system is at work in humans. In a study of people who committed suicide published Sunday in the journal Nature Neuroscience, researchers in Montreal report that people who were abused or neglected as children showed genetic alterations that likely made them more biologically sensitive to stress.

The findings help clarify the biology behind the wounds of a difficult childhood and hint at what constitutes resilience in those able to shake off such wounds.

The study “extends the animal work on the regulation of stress to humans in a dramatic way,” Jaak Panksepp, an adjunct professor at Washington State University who was not involved in the research, wrote in an e-mail message.

He added that the study “suggests pathways that have promoted the psychic pain that makes life intolerable,” and continued, “It’s a wonderful example of how the study of animal models of emotional resilience can lead the way to understanding human vicissitudes.”

To read the rest of this article, click here.

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