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Patterns of nucleotide substitution in pseudogenes and functional genes

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Summary

The pattern of point mutations is inferred from nucleotide substitutions in pseudogenes. The pattern obtained suggests that transition mutations occur somewhat more frequently than transversion mutations and that mutations result more often in A or T than in G or C. Our results are discussed with respect to the predictions from Topal and Fresco's model for the molecular basis of point (substitution) mutations (Nature 263:285–289, 1976). The pattern of nucleotide substitution at the first and second positions of codons in functional genes is quite similar to that in pseudogenes, but the relative frequency of the transition C→T in the sense strand is drastically reduced and those of the transversions C→G and G→C are doubled. The differences between the two patterns can be explained by the observation that in the protein evolution amino acid substitutions occur mainly between amino acids with similar biochemical properties (Grantham, Science 185:862–864, 1974). Our results for the patterns of nucleotide substitutions in pseudogenes and in functional genes lead to the prediction that both the coding and non-coding regions of protein coding genes should have high frequencies of A and T. Available data show that the non-coding regions are indeed high in A and T but the coding regions are low in T, though high in A.

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Gojobori, T., Li, WH. & Graur, D. Patterns of nucleotide substitution in pseudogenes and functional genes. J Mol Evol 18, 360–369 (1982). https://doi.org/10.1007/BF01733904

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  • DOI: https://doi.org/10.1007/BF01733904

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