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According to the World Health Organization (WHO), nearly one in seven people across the globe lived with a mental illness in 2021, with anxiety disorders and depression occurring most frequently. These conditions often stem from a mix of influences, and genetics play a major part in shaping a person’s risk. Having a close family member with a mental illness remains one of the strongest known predictors. Until recently, research suggested that psychiatric disorders typically develop from the combined effects of many different genes. Cause?