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Scientists discover first gene proven to directly cause mental illness

Scientists have discovered that a single gene, GRIN2A, can directly cause mental illness—something previously thought to stem only from many genes acting together. People with certain variants of this gene often develop psychiatric symptoms much earlier than expected, sometimes in childhood instead of adulthood. Even more surprising, some individuals show only mental health symptoms, without the seizures or learning problems usually linked to GRIN2A.

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