Life uses 4 DNA letters. Scientists just made 8 work

Researchers at UC San Diego have demonstrated that a key cellular enzyme can accurately read an eight-letter genetic alphabet, doubling the four letters used by all known life on Earth. Detailed imaging revealed that RNA polymerase handles synthetic DNA letters in surprisingly similar ways to natural ones. The finding brings scientists closer to building expanded genetic systems that could perform entirely new biological functions.

Life uses 4 DNA letters. Scientists just made 8 work. Scientists just made 8 work Science News from research organizations Life uses 4 DNA letters. Scientists just made 8 work Date: September 5, 2026.

Researchers at the University of California San Diego have now shown that one of biology’s most important enzymes can accurately read and transcribe a much larger version containing eight genetic letters. The finding suggests that cells can use their existing molecular machinery to handle synthetic genetic information. That marks an important step toward a long-standing goal in synthetic biology: expanding the language of DNA beyond the four letters found in nature.

In the future, such systems could help scientists engineer biological machinery that carries out new functions or produces compounds that do not naturally exist.