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Getting the latest healthcare news for you
Life as we know it runs on a four-letter genetic code — but what if it didn't have to? UC San Diego researchers have shown that a key natural enzyme can accurately read and transcribe an expanded, eight-letter DNA alphabet, opening the door to entirely new biological systems, diagnostics, and therapies.
Life on Earth has always played by the same rules: a four-letter genetic code (A, T, C, G) that underlies every living organism. But researchers at UC San Diego are rewriting those rules — literally. Their new studies show that RNA polymerase, the enzyme that reads DNA and kicks off gene expression, can accurately recognize and transcribe four additional synthetic "letters," doubling the genetic alphabet to eight.
Using cutting-edge cryo-electron microscopy capable of imaging structures smaller than a single atom's width, the team captured detailed snapshots of RNA polymerase interacting with synthetic base pairs. Remarkably, the enzyme processes these non-natural letters using the same structural and biochemical signals it uses for natural DNA — suggesting cells could one day run on expanded genetic instructions without needing a molecular overhaul.
Key Takeaways:
Why it matters: This research bridges a major gap in synthetic biology — proving that nature's own machinery can handle an expanded genetic code. That means future biotech applications, from cancer detection tools to novel drugs, could be built on a richer, more versatile genetic language.
