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Getting the latest healthcare news for you
Getting the latest healthcare news for you
Early-life stress physically rewires how brain cells package DNA, making stress-response genes easier to fire off for decades. Researchers at WashU and Princeton pinpointed an enzyme called SETD7 as the culprit — and showed that blocking it in mice prevented the anxiety and stress hypersensitivity that typically follows childhood trauma.
Childhood trauma doesn't just leave emotional scars — it may leave biological ones too. Scientists at Washington University School of Medicine and Princeton University have identified a molecular mechanism that helps explain why early adversity can make people more vulnerable to anxiety and depression later in life. The key player: an enzyme called SETD7, which alters how DNA is packaged inside dopamine-producing brain cells, essentially leaving stress-response genes in a more "open" and easily activated state.
Think of DNA like a coiled slinky wrapped around proteins called histones. SETD7 adds a chemical tag that loosens this structure, making certain genes more accessible. In mice exposed to early-life stress, elevated SETD7 levels created a lasting epigenetic "memory" of that adversity — one that made their brains overreact to stress as adults. Crucially, when researchers blocked SETD7 activity after early stress, the mice grew up behaving normally, even when faced with new stressors.
Key Takeaways:
Why it matters: Over half of children worldwide experience some form of early-life adversity. This research offers the first clear molecular mechanism linking childhood trauma to long-term mental health risk — and a potential pathway for interventions that could one day protect vulnerable kids before lasting damage sets in.
