Researchers Expand DNA's Genetic Alphabet to Eight Letters

Scientists at the University of California San Diego have successfully demonstrated that RNA polymerase, a crucial cellular enzyme, can accurately read and transcribe an eight-letter genetic alphabet. This effectively doubles the natural four-letter DNA alphabet found in all known life. Detailed imaging confirmed the enzyme processes these synthetic letters similarly to natural ones. This breakthrough could enable the engineering of biological systems with novel functions, leading to new diagnostic tools, therapeutics, and compounds.