Floyd E. Romesberg: The radical possibilities of man-made DNA

The radical possibilities of man-made DNA

Every cell that's ever lived has been the result of the four-letter genetic alphabet: A, T, C and G -- the basic units of DNA. But now that's changed. In a visionary talk, synthetic biologist Floyd E. Romesberg introduces us to the first living organisms created with six-letter DNA -- the four natural letters plus two new man-made ones, X and Y -- and explores how this breakthrough could challenge our basic understanding of nature's design.

Scientists have created living bacteria whose DNA includes two new man-made letters, bringing the genetic alphabet from four to six letters for the first time. This breakthrough enables cells to store more information and build proteins with new, unprecedented properties. By introducing these synthetic letters, researchers challenge the idea that life is limited to nature’s original design. The discovery opens possibilities for new medicines, materials, and ways to understand what life can be.