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Quantifying Adaptive Evolution in the Drosophila Immune System

Figure 4

The estimated rate of adaptive substitution is correlated between the D. melanogaster and D. simulans lineages.

The estimated number of adaptive substitutions per non-synonymous site, a, estimated independently along the D. melanogaster and D. simulans lineages (immune genes in red, control genes in blue). Spearman's rank correlation coefficient is significantly positive, indicating that genes with high rates of adaptive substitution in one lineage tend also to have high rates in the other (ρ = 0.36, p = 2×10−10). The correlation does not differ between immune genes and other genes (ρ = 0.47 vs. 0.29, p = 0.14 by bootstrapping), and the result is the same when using all populations (ρ = 0.51 vs. 0.35, p = 0.16).

Figure 4