But remember that the protons forming the hydrogen bonds in DNA are responsible for the specificity of base-pairing that is used to replicate the genetic code. So, if the pair of coding protons move (in opposite directions), they are effectively rewriting the genetic code. For example, if a genetic letter in a DNA strand is a T (thymine) then in its normal form it pairs, correctly, with A. However, if a double proton swap occurs then both T and A will adopt their tautomeric forms.
