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Figure 2 | BMC Evolutionary Biology

Figure 2

From: Genome wide exploration of the origin and evolution of amino acids

Figure 2

Trends in usage of GC-rich/poor codons and their encoded amino acids. Trends in usage of amino acids encoded by GC-rich codons (2a), amino acids encoded by GC-poor codons (2b), GC-rich codons (2c), and GC-poor codons (2d) over five eukaryotic organisms, Saccharomyces cerevisiae (Sc), Danio rerio (Dr), Mus musculus (Mm), Pan troglodytes (Pt), and Homo sapiens (Hs). Amino acids encoded by GC-rich codons (P, A, G, W) increase their usage from lower organisms to higher organisms while amino acids encoded by GC-poor codons (F, Y, N, K, I, M) in general decrease. All GC-rich codons (CCX, GCX, GGX, and UGG) increase their usage over the five eukaryotic organisms, while GC-poor codons (AAX, AUX, UUY and UAY) decrease their usage over eukaryotic species.

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