DNA stores our genetic code in an elegant double helix. But some argue that this elegance is overrated. “DNA as a molecule has many things wrong with it,” said Steven Benner, an organic chemist at the Foundation for Applied Molecular Evolution in Florida.
Nearly 30 years ago, Benner sketched out better versions of both DNA and its chemical cousin RNA, adding new letters and other additions that would expand their repertoire of chemical feats. He wondered why these improvements haven’t occurred in living creatures. Nature has written the entire language of life using just four chemical letters: G, C, A and T. Did our genetic code settle on these four nucleotides for a reason? Or was this system one of many possibilities, selected by simple chance? Perhaps expanding the code could make it better.
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