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Genetic Basis for Mood and Bipolar Disorders

Mood disorders have been proven to have genetic basis. Individuals with relatives who have major depressive disorder are twice likely to develop such disorder. Individuals with twins with major depressive disorder are also prone to develop major depressive disorder themselves.

Individuals with relatives with bipolar disorder will nine times more likely to develop bipolar disorder themselves. Individuals with twins with bipolar disorder are also prone to develop such a disorder themselves.

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Updated 2025-10-09

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