A global research project has mapped out the genetic basis of major depression, identifying 44 genetic variants which are risk factors for depression, 30 of which are newly discovered. The study, by the Psychiatric Genomics Consortium, and co-led in the UK by King's College London, is the largest study to-date of genetic risk factors for major depression. Published online on April 26, 2018 in Nature Genetics, the research finds that the genetic basis for major depression is shared with other psychiatric disorders such as schizophrenia, and that all humans carry at least some of the 44 genetic risk factors identified in the study. The article is titled “Genome-Wide Association Analyses Identify 44 Risk Variants and Refine the Genetic Architecture of Major Depression.” A significant number of the genetic variants identified in the study are directly linked to the targets of current antidepressant medications. Analysis of the data also suggests that having a higher body mass index (BMI) is linked to an increased risk of major depression. Previous studies have struggled to identify more than a handful of genetic variants associated with depression. By combining seven separate datasets, the research team included data on more than 135,000 people with major depression and more than 344,000 controls. The study was an unprecedented global effort by over 200 scientists who work with the Psychiatric Genomics Consortium, and was led by the University of North Carolina School of Medicine and the University of Queensland in Australia. Professor Cathryn Lewis and Dr. Gerome Breen of King's College London led the UK contribution, along with scientists and psychiatrists from the Universities of Edinburgh, Cardiff, and University College London (UCL).
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