1 Notes by Ziheng, 12 August 2003, modified in October 2008
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3 (A) This is about codon models for McDonald & Kreithman-style test using
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4 the ape mt data used in Hasegawa et al. (1998).
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9 The following are model specifications and log likelihood values, as
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10 well as MLEs. "W" and "B" refer to within- and between-species
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11 branches. "R" and "C" refer to radical and conserved amino acid
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15 np=11 model=0 aaDist=0: lnL=-20486.034301 k=20.74839 w=0.04414
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17 np=12 model=2 aaDist=0: lnL=-20444.099676 k=21.59077 wW=0.28638 wB=0.03693
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19 np=12 model=0 aaDist=7: lnL=-20482.229434 k=20.52018 wR=0.02745 wC=0.04658
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21 np=14 model=2 aaDist=7: lnL=-20440.382774 k=21.36004 wWR=0.15012 wWC=0.30470 wBR=0.02380 wBC=0.03885
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24 (B) mtCDNA.HC.txt (control file codeml.HC.ctl) has the human and chimp
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25 sequences only, and is the dataset analyzed by Yang and Nielsen (2008,
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26 table 1). The new models described in that paper are implemented
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27 using the two control variables CodonFreq and estFreq in the control
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28 file codeml.ctl. You can try to duplicate our results. Note that
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29 some results are in the supplementary result file rst.
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31 CodonFreq = 7 * 0:1/61 each, 1:F1X4, 2:F3X4, 3:codon table
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32 * 4:F1x4MG, 5:F3x4MG, 6:FMutSel0, 7:FMutSel
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35 Run the analysis by
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36 codeml codeml.HC.ctl
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38 In this case, the control file specifies clock = 1. The clock is used
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39 as there are only 2 sequences and the tree (2s.trees) is rooted. If
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40 you have more than 2 sequences, you should use an unrooted tree and
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48 Hasegawa, M., Y. Cao and Z. Yang. 1998. Preponderance of slightly
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49 deleterious polymorphism in mitochondrial DNA: replacement/synonymous
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50 rate ratio is much higher within species than between
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51 species. Molecular Biology and Evolution 15:1499-1505.
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53 Yang Z, Nielsen R. 2008. Mutation-selection models of codon substitution
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54 and their use to estimate selective strengths on codon usage.
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55 Molecular Biology and Evolution 25:568-579.
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57 Yang, Z., R. Nielsen and M. Hasegawa. 1998. Models of amino acid
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58 substitution and applications to mitochondrial protein
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59 evolution. Molecular Biology and Evolution 15:1600-1611.
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