Summary
We present a phenomenological theory expressing the constraints operating on the (G+C) contents of the three codon positions, i.e., first, second, and third bases of codons, by using the smallest number of constraint parameters having clear physical and genetic meaning. Theoretical curves displaying base composition at each of the three codon sites are given. The agreement between the theoretical curves and the data points of 1277 genes is quite good irrespective of the species from which the DNAs originated; the curves might be universal ones and the constraint parameters might have general biological meanings in relation to the DNA/RNA and protein functions.
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Wada, A., Suyama, A. & Hanai, R. Phenomenological theory of GC/AT pressure on DNA base composition. J Mol Evol 32, 374–378 (1991). https://doi.org/10.1007/BF02101277
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DOI: https://doi.org/10.1007/BF02101277