2 January 2010

Evolution without DNA or RNA

On the face of it, you have exactly the same process of mutation and adaptive change in prions as you see in viruses. This means that this pattern of Darwinian evolution appears to be universally active. In viruses, mutation is linked to changes in nucleic acid sequence that leads to resistance. Now, this adaptability has moved one level down - to prions and protein folding - and it's clear that you do not need nucleic acid (DNA or RNA) for the process of evolution.
-- Charles Weissman quoted in BBC report on the paper Darwinian Evolution of Prions in Cell Culture

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