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The trauma of child abuse can last a lifetime, leading to a higher risk of anxiety, depression and suicide further down the line. This link seems obvious, but a group of Canadian scientists have found that it has a genetic basis. By studying the brains of suicide victims, Patrick McGowan from the Douglas Mental Health University Institute, found that child abuse modifies a gene called NR3C1 that affects a person's ability to deal with stress. The changes it wrought were "epigenetic", meaning that the gene's DNA sequence wasn't altered but it's structure was modified to make it less active.…