Genetic information can be stored and retrieved from polymers “not found in nature”
Genetic information storage and processing rely on just two polymers, DNA and RNA. Whether their role reflects evolutionary history or fundamental functional constraints is unknown. Using polymerase evolution and design, we show that genetic information can be stored in and recovered from six alternative genetic polymers (XNAs) based on simple nucleic acid architectures not found in nature. We also select XNA aptamers, which bind their targets with high affinity and specificity, demonstrating that beyond heredity, specific XNAs have the capacity for Darwinian evolution and for folding into defined structures. Thus, heredity and evolution, two hallmarks of life, are not limited to DNA and RNA but are likely to be emergent properties of polymers capable of information storage.
The nucleic acids DNA and RNA provide the molecular basis…
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