Life uses 4 DNA letters. Scientists just made 8 work
Researchers at UC San Diego have successfully demonstrated that RNA polymerase can read and transcribe an expanded genetic alphabet consisting of eight letters instead of the natural four. This breakthrough could enable the engineering of biological machinery with entirely new functions.
Why it matters
Expanding the genetic code is a foundational step in synthetic biology that could lead to the creation of new materials, medicines, and biological technologies.
All known life on Earth relies on the same four-letter genetic alphabet. 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.
How Cells Read an Eight-Letter Genetic Alphabet
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