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You're both right. Genetics play a mild role in major depression (a bigger role in bipolar disorder). Genetics may serve as a predisposing factor to depression, but the evidence is growing that depression has a great deal to do with the ongoing and repetitive interactions within the family.
Researchers, for the first time, have pinpointed a genetic hotspot that confers risk for both bipolar disorder and depression. People with either of these mood disorders were significantly more likely to have risk versions of genes at this site than healthy controls.ajor mood disorders affect 20 percent of the population and are among the leading causes of disability worldwide. It's long been known that bipolar disorder and unipolar depression often run together in the same families, hinting at some shared lineage.