2019
DOI: 10.1101/510735
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Molecular evolution in small steps under prevailing negative selection – A nearly-universal rule of codon substitution

Abstract: The widely accepted view that evolution proceeds in small steps is based on two premises: i) negative selection acts strongly against large differences (Kimura 1983); and ii) positive selection favors small-step changes (Fisher 1930). The two premises are not biologically connected and should be evaluated separately.We now extend the approach of Tang et al. (2004) to codon evolution for the entire genome. Codon substitution rate is a function of the physico-chemical distance between amino acids (AAs), equated … Show more

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“…Among the factors traditionally thought to determine functional constraint are functional density (i.e. the proportion of critical sites) (Dickerson, 1971;Zuckerkandl, 1976) and the physicochemical differences between amino acid sequences and their 'single-mutation derivatives' (Epstein, 1967;Grantham, 1974;Kimura, 1983;Graur, 1985;Tang et al, 2004;Chen et al, 2019). In practice, the functional constraint of a protein can be measured based on the second criterion (e.g.…”
Section: Is the Neutral Hypothesis Falsifiable? (1) Strict Neutrality...mentioning
confidence: 99%
“…Among the factors traditionally thought to determine functional constraint are functional density (i.e. the proportion of critical sites) (Dickerson, 1971;Zuckerkandl, 1976) and the physicochemical differences between amino acid sequences and their 'single-mutation derivatives' (Epstein, 1967;Grantham, 1974;Kimura, 1983;Graur, 1985;Tang et al, 2004;Chen et al, 2019). In practice, the functional constraint of a protein can be measured based on the second criterion (e.g.…”
Section: Is the Neutral Hypothesis Falsifiable? (1) Strict Neutrality...mentioning
confidence: 99%