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restgenomeanalysisenglish [2014/08/10 14:50]
haruo
restgenomeanalysisenglish [2014/08/12 00:22]
haruo
Line 317: Line 317:
 Of the existing COA methods, Within-group Correspondence Analysis (WCA) performs best because it does not mask variation in synonymous codon usage caused by amino acid composition and codon degeneracy [[http://​www.ncbi.nlm.nih.gov/​pubmed/​18940873|(Suzuki H et al., 2008)]]. Of the existing COA methods, Within-group Correspondence Analysis (WCA) performs best because it does not mask variation in synonymous codon usage caused by amino acid composition and codon degeneracy [[http://​www.ncbi.nlm.nih.gov/​pubmed/​18940873|(Suzuki H et al., 2008)]].
  
-codon_mva (http://​rest.g-language.org/​help/​codon_mva) performs WCA of codon usage data for a given genome, and analyzes correlations between the WCA axes and various gene parameters (e.g. Laa, aroma, gravy, mmw, gcc3, gtc3, and P2). In the WCA plots, the first four axes (Comp1 to Comp4) obtained by WCA are shown in y-axes, and the gene features (gcc3 and gtc3) having the largest absolute correlation coefficients (|r|) are shown in x-axes. ​+codon_mva (http://​rest.g-language.org/​help/​codon_mva) performs WCA of codon usage data for a given genome, and analyzes correlations between the WCA axes and various gene parameters (e.g. Laa, aroma, gravy, mmw, gcc3, gtc3, and P2). In the WCA plots, the first four axes (Comp1 to Comp4) obtained by WCA are shown in y-axes, and the gene features (e.g. gcc3 and gtc3) having the largest absolute correlation coefficients (|r|) are shown in x-axes. ​
  
   * For //E.coli// (http://​rest.g-language.org/​ecoli/​codon_mva),​ Comp1 (20.8% of variation) is correlated with gcc3 (G+C content at 3rd codon position) (r = 0.70). Comp2 (9.9% of variation) clearly separates highly expressed genes (red circles) from the other genes (black crosses) (the mean absolute standard score for highly expressed genes, z = 3.14), suggesting that translational selection is acting on synonymous codon usage.   * For //E.coli// (http://​rest.g-language.org/​ecoli/​codon_mva),​ Comp1 (20.8% of variation) is correlated with gcc3 (G+C content at 3rd codon position) (r = 0.70). Comp2 (9.9% of variation) clearly separates highly expressed genes (red circles) from the other genes (black crosses) (the mean absolute standard score for highly expressed genes, z = 3.14), suggesting that translational selection is acting on synonymous codon usage.
  
-  * For //​B.burgdorferi//​ (http://​rest.g-language.org/​bbur/​codon_mva),​ Comp1 is correlated with gtc3 (G+T content at 3rd codon position) (r = 0.96), and it clearly separates genes located on leading and lagging strands of DNA replication. Intragenomic variation in GC skew (http://​rest.g-language.org/​bbur/​gcskew/​cumulative=1) and AT skew (http://​rest.g-language.org/​bbur/​gcskew//​cumulative=1/at=1) presumably reflects strand-specific mutational bias.+  * For //​B.burgdorferi//​ (http://​rest.g-language.org/​bbur/​codon_mva),​ Comp1 is correlated with gtc3 (G+T content at 3rd codon position) (r = 0.96), and it clearly separates genes located on leading and lagging strands of DNA replication. Intragenomic variation in GC skew (http://​rest.g-language.org/​bbur/​gcskew) and AT skew (http://​rest.g-language.org/​bbur/​gcskew/​at=1) presumably reflects strand-specific mutational bias.
  
   * For //​M.genitalium//​ (http://​rest.g-language.org/​mgen/​codon_mva),​ Comp1 is correlated with gcc3 (r = 0.96). Intragenomic variation in G+C content mostly reflects the existence of regions with anomalous nucleotide composition,​ putatively acquired by horizontal transfer. The exception to this is //​M.genitalium//,​ in which intragenomic G+C variation is continuous along the genome (http://​rest.g-language.org/​mgen/​gcwin).   * For //​M.genitalium//​ (http://​rest.g-language.org/​mgen/​codon_mva),​ Comp1 is correlated with gcc3 (r = 0.96). Intragenomic variation in G+C content mostly reflects the existence of regions with anomalous nucleotide composition,​ putatively acquired by horizontal transfer. The exception to this is //​M.genitalium//,​ in which intragenomic G+C variation is continuous along the genome (http://​rest.g-language.org/​mgen/​gcwin).
restgenomeanalysisenglish.txt ยท Last modified: 2014/12/13 08:25 by haruo