Code protection protein found, according to a report in Science vol. 309, p2219, 30 Sep 2005. Scientists at Mt Sinai School of Medicine, New York have studied a protein, named Rev1 that enables accurate copying of DNA even after one of the code letters is damaged. DNA code is carried by small molecules called bases which are attached to each strand of the double helix. There are four bases, A, T, G and C which form pairs so that A always pairs with T, and C with G. Because of this consistent pairing DNA information can be accurately copied by pulling apart the two strands and then adding the appropriate pair partners, e.g. if the copying machinery finds a G it will add a C to the new strand. However, if the bases are damaged the copying machinery will stop. Rev1 enables copying to continue even if some letters are damaged. It attaches to damaged G’s. When a new strand is being made it attracts a C to itself and enables it to be incorporated into the new DNA strand in the right place.
Editorial Comment: This protein reminds us that living cells must have numerous other back-up systems that work together to prevent their DNA information from changing with each new generation. This means living organisms are well equipped to not evolve, and are guaranteed to reproduce after their kind, just as Genesis one says. (Ref. genetics, nucleotides, guanine)