Abstract
We develop here an analytical evolutionary model based on a trinucleotide mutation matrix 64× 64 with nine substitution parameters associated with the three types of substitutions in the three trinucleotide sites. It generalizes the previous models based on the nucleotide mutation matrices 4× 4 and the trinucleotide mutation matrix 64× 64 with three and six parameters. It determines at some time t the exact occurrence probabilities of trinucleotides mutating randomly according to these nine substitution parameters. An application of this model allows an evolutionary study of the common circular code \(\mathcal{C}\) of eukaryotes and prokaryotes and its 12 coded amino acids. The main property of this code \(\mathcal{C}\) is the retrieval of the reading frames in genes, both locally, i.e. anywhere in genes and in particular without a start codon, and automatically with a window of a few nucleotides. However, since its identification in 1996, amino acid information coded by \(\mathcal{C}\) has never been studied. Very unexpectedly, this evolutionary model demonstrates that random substitutions in this code \(\mathcal{C}\) and with particular values for the nine substitutions parameters retrieve after a certain time of evolution a frequency distribution of these 12 amino acids very close to the one coded by the actual genes.
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Michel, C.J. An Analytical Model of Gene Evolution with 9 Mutation Parameters: An Application to the Amino Acids Coded by the Common Circular Code. Bull. Math. Biol. 69, 677–698 (2007). https://doi.org/10.1007/s11538-006-9147-z
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DOI: https://doi.org/10.1007/s11538-006-9147-z